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Merge pull request #1796 from edx/jmclaus/feature_jsinput_template

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Added JSInput template in Studio.
This commit is contained in:
jmclaus
2013-12-20 08:44:42 -08:00
parent ce18bcecda 5478525a42
commit 9de690afeb
11 changed files with 1074 additions and 313 deletions
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17
common/lib/capa/capa/inputtypes.py
View File

@@ -456,11 +456,9 @@ registry.register(JavascriptInput)
class JSInput(InputTypeBase):
"""
DO NOT USE! HAS NOT BEEN TESTED BEYOND 700X PROBLEMS, AND MAY CHANGE IN
BACKWARDS-INCOMPATIBLE WAYS.
Inputtype for general javascript inputs. Intended to be used with
Inputtype for general javascript inputs. Intended to be used with
customresponse.
Loads in a sandboxed iframe to help prevent css and js conflicts between
Loads in a sandboxed iframe to help prevent css and js conflicts between
frame and top-level window.
iframe sandbox whitelist:
@@ -478,7 +476,8 @@ class JSInput(InputTypeBase):
height="500"
width="400"/>
See the documentation in the /doc/public folder for more information.
See the documentation in docs/data/source/course_data_formats/jsinput.rst
for more information.
"""
template = "jsinput.html"
@@ -498,12 +497,16 @@ class JSInput(InputTypeBase):
Attribute('set_statefn', None), # Function to call iframe to
# set state
Attribute('width', "400"), # iframe width
Attribute('height', "300") # iframe height
Attribute('height', "300"), # iframe height
Attribute('sop', None) # SOP will be relaxed only if this
# attribute is set to false.
]
def _extra_context(self):
context = {
'applet_loader': '{static_url}js/capa/src/jsinput.js'.format(
'jschannel_loader': '{static_url}js/capa/src/jschannel.js'.format(
static_url=self.system.STATIC_URL),
'jsinput_loader': '{static_url}js/capa/src/jsinput.js'.format(
static_url=self.system.STATIC_URL),
'saved_state': self.value
}

8
common/lib/capa/capa/templates/jsinput.html
View File

@@ -9,10 +9,14 @@
% if set_statefn:
data-setstate="${set_statefn}"
% endif
% if sop:
data-sop="${sop}"
% endif
data-processed="false"
>
<div class="script_placeholder" data-src="${applet_loader}"/>
<div class="script_placeholder" data-src="${jschannel_loader}"/>
<div class="script_placeholder" data-src="${jsinput_loader}"/>
% if status == 'unsubmitted':
<div class="unanswered" id="status_${id}">
% elif status == 'correct':

22
common/lib/xmodule/xmodule/js/src/capa/display.coffee
View File

@@ -151,7 +151,7 @@ class @Problem
# If some function wants to be called before sending the answer to the
# server, give it a chance to do so.
#
# check_waitfor allows the callee to send alerts if the user's input is
# check_save_waitfor allows the callee to send alerts if the user's input is
# invalid. To do so, the callee must throw an exception named "Waitfor
# Exception". This and any other errors or exceptions that arise from the
# callee are rethrown and abort the submission.
@@ -159,18 +159,23 @@ class @Problem
# In order to use this feature, add a 'data-waitfor' attribute to the input,
# and specify the function to be called by the check button before sending
# off @answers
check_waitfor: =>
check_save_waitfor: (callback) =>
for inp in @inputs
if ($(inp).is("input[waitfor]"))
try
$(inp).data("waitfor")()
@refreshAnswers()
$(inp).data("waitfor")(() =>
@refreshAnswers()
callback()
)
catch e
if e.name == "Waitfor Exception"
alert e.message
else
alert "Could not grade your answer. The submission was aborted."
throw e
return true
else
return false
###
@@ -254,7 +259,10 @@ class @Problem
$.ajaxWithPrefix("#{@url}/problem_check", settings)
check: =>
@check_waitfor()
if not @check_save_waitfor(@check_internal)
@check_internal()
check_internal: =>
Logger.log 'problem_check', @answers
# Segment.io
@@ -334,6 +342,10 @@ class @Problem
@el.find('.capa_alert').css(opacity: 0).animate(opacity: 1, 700)
save: =>
if not @check_save_waitfor(@save_internal)
@save_internal()
save_internal: =>
Logger.log 'problem_save', @answers
$.postWithPrefix "#{@url}/problem_save", @answers, (response) =>
saveMessage = response.msg

44
common/lib/xmodule/xmodule/templates/problem/jsinput_response.yaml Normal file
View File

@@ -0,0 +1,44 @@
---
metadata:
display_name: Custom Javascript Display and Grading
markdown: !!null
data: |
<problem display_name="webGLDemo">
<script type="loncapa/python">
import json
def vglcfn(e, ans):
'''
par is a dictionary containing two keys, "answer" and "state"
The value of answer is the JSON string returned by getGrade
The value of state is the JSON string returned by getState
'''
par = json.loads(ans)
# We can use either the value of the answer key to grade
answer = json.loads(par["answer"])
return answer["cylinder"] and not answer["cube"]
'''
# Or we could use the value of the state key
state = json.loads(par["state"])
selectedObjects = state["selectedObjects"]
return selectedObjects["cylinder"] and not selectedObjects["cube"]
'''
</script>
<p>
The shapes below can be selected (yellow) or unselected (cyan).
Clicking on them repeatedly will cycle through these two states.
</p>
<p>
If the cone is selected (and not the cube), a correct answer will be
generated after pressing "Check". Clicking on either "Check" or "Save"
will register the current state.
</p>
<customresponse cfn="vglcfn">
<jsinput gradefn="WebGLDemo.getGrade"
get_statefn="WebGLDemo.getState"
set_statefn="WebGLDemo.setState"
width="400"
height="400"
html_file="https://studio.edx.org/c4x/edX/DemoX/asset/webGLDemo.html"
sop="false"/>
</customresponse>
</problem>

50
common/static/js/capa/fixtures/jsinput.html Normal file
View File

@@ -0,0 +1,50 @@
<section
id="inputtype_1"
data="getGrade"
data-stored="{&quot;answer&quot;:&quot;{\&quot;cylinder\&quot;:true,\&quot;cube\&quot;:true}&quot;,&quot;state&quot;:&quot;{\&quot;selectedObjects\&quot;:{\&quot;cylinder\&quot;:true,\&quot;cube\&quot;:true}}&quot;}"
data-getstate="getState"
data-setstate="setState"
data-processed="false"
data-sop="false"
class="jsinput">
<div class="script_placeholder"/>
<iframe
name="iframe_1"
sandbox="allow-scripts
allow-popups
allow-same-origin
allow-forms
allow-pointer-lock"
height="500"
width="500"
src="https://studio.edx.org/c4x/edX/DemoX/asset/webGLDemo.html">
</iframe>
<input type="hidden" name="input_1" id="input_1" waitfor value="{&quot;answer&quot;:&quot;{\&quot;cylinder\&quot;:true,\&quot;cube\&quot;:true}&quot;,&quot;state&quot;:&quot;{\&quot;selectedObjects\&quot;:{\&quot;cylinder\&quot;:true,\&quot;cube\&quot;:true}}&quot;}">
</div>
</section>
<section
id="inputtype_2"
data="getGrade"
data-stored="{&quot;answer&quot;:&quot;{\&quot;cylinder\&quot;:true,\&quot;cube\&quot;:true}&quot;,&quot;state&quot;:&quot;{\&quot;selectedObjects\&quot;:{\&quot;cylinder\&quot;:true,\&quot;cube\&quot;:true}}&quot;}"
data-getstate="getState"
data-setstate="setState"
data-processed="false"
data-sop="false"
class="jsinput">
<div class="script_placeholder"/>
<iframe
name="iframe_2"
sandbox="allow-scripts
allow-popups
allow-same-origin
allow-forms
allow-pointer-lock"
height="500"
width="500"
src="https://studio.edx.org/c4x/edX/DemoX/asset/webGLDemo.html">
</iframe>
<input type="hidden" name="input_2" id="input_1" waitfor value="{&quot;answer&quot;:&quot;{\&quot;cylinder\&quot;:true,\&quot;cube\&quot;:true}&quot;,&quot;state&quot;:&quot;{\&quot;selectedObjects\&quot;:{\&quot;cylinder\&quot;:true,\&quot;cube\&quot;:true}}&quot;}">
</div>
</section>

84
common/static/js/capa/spec/jsinput_spec.js
View File

@@ -1,70 +1,30 @@
xdescribe("A jsinput has:", function () {
describe("JSInput", function() {
beforeEach(function () {
$('#fixture').remove();
$.ajax({
async: false,
url: 'mainfixture.html',
success: function(data) {
$('body').append($(data));
}
loadFixtures('js/capa/fixtures/jsinput.html');
});
it('sets all data-processed attributes to true on first load', function() {
var sections = $(document).find('section[id="inputtype_"]');
JSInput.walkDOM();
sections.each(function(index, section) {
expect(section.attr('data-processed')).toEqual('true');
});
});
describe("The jsinput constructor", function(){
var iframe1 = $(document).find('iframe')[0];
var testJsElem = jsinputConstructor({
id: 1,
elem: iframe1,
passive: false
});
it("Returns an object", function(){
expect(typeof(testJsElem)).toEqual('object');
});
it("Adds the object to the jsinput array", function() {
expect(jsinput.exists(1)).toBe(true);
});
describe("The returned object", function() {
it("Has a public 'update' method", function(){
expect(testJsElem.update).toBeDefined();
});
it("Returns an 'update' that is idempotent", function(){
var orig = testJsElem.update();
for (var i = 0; i++; i < 5) {
expect(testJsElem.update()).toEqual(orig);
}
});
it("Changes the parent's inputfield", function() {
testJsElem.update();
});
});
it('sets the data-processed attribute to true on subsequent load', function() {
var section1 = $(document).find('section[id="inputtype_1"]'),
section2 = $(document).find('section[id="inputtype_2"]');
section1.attr('data-processed', false);
JSInput.walkDOM();
expect(section1.attr('data-processed')).toEqual('true');
expect(section2.attr('data-processed')).toEqual('true');
});
describe("The walkDOM functions", function() {
walkDOM();
it("Creates (at least) one object per iframe", function() {
jsinput.arr.length >= 2;
});
it("Does not create multiple objects with the same id", function() {
while (jsinput.arr.length > 0) {
var elem = jsinput.arr.pop();
expect(jsinput.exists(elem.id)).toBe(false);
}
it('sets the waitfor attribute to its update function', function() {
var inputFields = $(document).find('input[id="input_"]');
JSInput.walkDOM();
inputFields.each(function(index, inputField) {
expect(inputField.data('waitfor')).toBeDefined();
});
});
})
});

118
common/static/js/capa/spec/mainfixture.html
View File

@@ -1,118 +0,0 @@
<html>
<head>
<title> JSinput jasmine test </title>
</head>
<body>
<section id="inputtype_1"
data="gradefn"
data-setstate="setinput"
class="jsinput">
<div class="script_placeholder" />
<iframe name="iframe_1"
sandbox="allow-scripts
allow-popups
allow-same-origin
allow-forms
allow-pointer-lock"
seamless="seamless"
height="500"
width="500">
<html>
<head>
<title>
JS input test 1
</title>
<script type="text/javascript">
function gradefn () {
var ans = document.getElementById("one").value;
console.log("I've been called!");
return ans
}
function setinput(val) {
document.getElementById("one").value(val);
return;
}
</script>
</head>
<body>
<p>Simple js input test. Defines a js function that returns the value in
the input field below when called. </p>
<form>
<input id='one' type="TEXT"/>
</form>
</body>
</html>
</iframe>
<input type="hidden" name="input_1" id="input_1" value="${value|h}"/>
<br/>
<button id="update_1" class="update">Update</button>
<p id="answer_1" class="answer"></p>
<p class="status">
</p>
<br/> <br/>
<div class="error_message" ></div>
</section>
<section id="inputtype_2" data="gradefn" class="jsinput">
<div class="script_placeholder" />
<iframe name="iframe_2"
sandbox="allow-scripts
allow-popups
allow-same-origin
allow-forms
allow-pointer-lock"
seamless="seamless"
height="500"
width="500" >
<html>
<head>
<title>
JS input test
</title>
<script type="text/javascript">
function gradefn () {
var ans = document.getElementById("one").value;
console.log("I've been called!");
return ans
}
</script>
</head>
<body>
<p>Simple js input test. Defines a js function that returns the value in
the input field below when called. </p>
<form>
<input id='two' type="TEXT"/>
</form>
</body>
</html>
</iframe>
<input type="hidden" name="input_2" id="input_2" value="${value|h}"/>
<br/>
<button id="update_2" class="update">Update</button>
<p id="answer_2" class="answer"></p>
<p class="status">
</p>
<br/> <br/>
<div class="error_message"></div>
</section>
</body>
</html>

788
common/static/js/capa/src/jschannel.js Normal file
View File

@@ -0,0 +1,788 @@
/*
GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.
2. Conveying Modified Versions.
If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
that uses the facility (other than as an argument passed when the
facility is invoked), then you may convey a copy of the modified
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a) under this License, provided that you make a good faith effort to
ensure that, in the event an Application does not supply the
function or data, the facility still operates, and performs
whatever part of its purpose remains meaningful, or
b) under the GNU GPL, with none of the additional permissions of
this License applicable to that copy.
3. Object Code Incorporating Material from Library Header Files.
The object code form of an Application may incorporate material from
a header file that is part of the Library. You may convey such object
code under terms of your choice, provided that, if the incorporated
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b) Accompany the object code with a copy of the GNU GPL and this license
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4. Combined Works.
You may convey a Combined Work under terms of your choice that,
taken together, effectively do not restrict modification of the
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engineering for debugging such modifications, if you also do each of
the following:
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the Library is used in it and that the Library and its use are
covered by this License.
b) Accompany the Combined Work with a copy of the GNU GPL and this license
document.
c) For a Combined Work that displays copyright notices during
execution, include the copyright notice for the Library among
these notices, as well as a reference directing the user to the
copies of the GNU GPL and this license document.
d) Do one of the following:
0) Convey the Minimal Corresponding Source under the terms of this
License, and the Corresponding Application Code in a form
suitable for, and under terms that permit, the user to
recombine or relink the Application with a modified version of
the Linked Version to produce a modified Combined Work, in the
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Library. A suitable mechanism is one that (a) uses at run time
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of the Library that is interface-compatible with the Linked
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e) Provide Installation Information, but only if you would otherwise
be required to provide such information under section 6 of the
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necessary to install and execute a modified version of the
Combined Work produced by recombining or relinking the
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you use option 4d0, the Installation Information must accompany
the Minimal Corresponding Source and Corresponding Application
Code. If you use option 4d1, you must provide the Installation
Information in the manner specified by section 6 of the GNU GPL
for conveying Corresponding Source.)
5. Combined Libraries.
You may place library facilities that are a work based on the
Library side by side in a single library together with other library
facilities that are not Applications and are not covered by this
License, and convey such a combined library under terms of your
choice, if you do both of the following:
a) Accompany the combined library with a copy of the same work based
on the Library, uncombined with any other library facilities,
conveyed under the terms of this License.
b) Give prominent notice with the combined library that part of it
is a work based on the Library, and explaining where to find the
accompanying uncombined form of the same work.
6. Revised Versions of the GNU Lesser General Public License.
The Free Software Foundation may publish revised and/or new versions
of the GNU Lesser General Public License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the
Library as you received it specifies that a certain numbered version
of the GNU Lesser General Public License "or any later version"
applies to it, you have the option of following the terms and
conditions either of that published version or of any later version
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If the Library as you received it specifies that a proxy can decide
whether future versions of the GNU Lesser General Public License shall
apply, that proxy's public statement of acceptance of any version is
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Library.
*/
/*
* js_channel is a very lightweight abstraction on top of
* postMessage which defines message formats and semantics
* to support interactions more rich than just message passing
* js_channel supports:
* + query/response - traditional rpc
* + query/update/response - incremental async return of results
* to a query
* + notifications - fire and forget
* + error handling
*
* js_channel is based heavily on json-rpc, but is focused at the
* problem of inter-iframe RPC.
*
* Message types:
* There are 5 types of messages that can flow over this channel,
* and you may determine what type of message an object is by
* examining its parameters:
* 1. Requests
* + integer id
* + string method
* + (optional) any params
* 2. Callback Invocations (or just "Callbacks")
* + integer id
* + string callback
* + (optional) params
* 3. Error Responses (or just "Errors)
* + integer id
* + string error
* + (optional) string message
* 4. Responses
* + integer id
* + (optional) any result
* 5. Notifications
* + string method
* + (optional) any params
*/
;var Channel = (function() {
"use strict";
// current transaction id, start out at a random *odd* number between 1 and a million
// There is one current transaction counter id per page, and it's shared between
// channel instances. That means of all messages posted from a single javascript
// evaluation context, we'll never have two with the same id.
var s_curTranId = Math.floor(Math.random()*1000001);
// no two bound channels in the same javascript evaluation context may have the same origin, scope, and window.
// futher if two bound channels have the same window and scope, they may not have *overlapping* origins
// (either one or both support '*'). This restriction allows a single onMessage handler to efficiently
// route messages based on origin and scope. The s_boundChans maps origins to scopes, to message
// handlers. Request and Notification messages are routed using this table.
// Finally, channels are inserted into this table when built, and removed when destroyed.
var s_boundChans = { };
// add a channel to s_boundChans, throwing if a dup exists
function s_addBoundChan(win, origin, scope, handler) {
function hasWin(arr) {
for (var i = 0; i < arr.length; i++) if (arr[i].win === win) return true;
return false;
}
// does she exist?
var exists = false;
if (origin === '*') {
// we must check all other origins, sadly.
for (var k in s_boundChans) {
if (!s_boundChans.hasOwnProperty(k)) continue;
if (k === '*') continue;
if (typeof s_boundChans[k][scope] === 'object') {
exists = hasWin(s_boundChans[k][scope]);
if (exists) break;
}
}
} else {
// we must check only '*'
if ((s_boundChans['*'] && s_boundChans['*'][scope])) {
exists = hasWin(s_boundChans['*'][scope]);
}
if (!exists && s_boundChans[origin] && s_boundChans[origin][scope])
{
exists = hasWin(s_boundChans[origin][scope]);
}
}
if (exists) throw "A channel is already bound to the same window which overlaps with origin '"+ origin +"' and has scope '"+scope+"'";
if (typeof s_boundChans[origin] != 'object') s_boundChans[origin] = { };
if (typeof s_boundChans[origin][scope] != 'object') s_boundChans[origin][scope] = [ ];
s_boundChans[origin][scope].push({win: win, handler: handler});
}
function s_removeBoundChan(win, origin, scope) {
var arr = s_boundChans[origin][scope];
for (var i = 0; i < arr.length; i++) {
if (arr[i].win === win) {
arr.splice(i,1);
}
}
if (s_boundChans[origin][scope].length === 0) {
delete s_boundChans[origin][scope];
}
}
function s_isArray(obj) {
if (Array.isArray) return Array.isArray(obj);
else {
return (obj.constructor.toString().indexOf("Array") != -1);
}
}
// No two outstanding outbound messages may have the same id, period. Given that, a single table
// mapping "transaction ids" to message handlers, allows efficient routing of Callback, Error, and
// Response messages. Entries are added to this table when requests are sent, and removed when
// responses are received.
var s_transIds = { };
// class singleton onMessage handler
// this function is registered once and all incoming messages route through here. This
// arrangement allows certain efficiencies, message data is only parsed once and dispatch
// is more efficient, especially for large numbers of simultaneous channels.
var s_onMessage = function(e) {
try {
var m = JSON.parse(e.data);
if (typeof m !== 'object' || m === null) throw "malformed";
} catch(e) {
// just ignore any posted messages that do not consist of valid JSON
return;
}
var w = e.source;
var o = e.origin;
var s, i, meth;
if (typeof m.method === 'string') {
var ar = m.method.split('::');
if (ar.length == 2) {
s = ar[0];
meth = ar[1];
} else {
meth = m.method;
}
}
if (typeof m.id !== 'undefined') i = m.id;
// w is message source window
// o is message origin
// m is parsed message
// s is message scope
// i is message id (or undefined)
// meth is unscoped method name
// ^^ based on these factors we can route the message
// if it has a method it's either a notification or a request,
// route using s_boundChans
if (typeof meth === 'string') {
var delivered = false;
if (s_boundChans[o] && s_boundChans[o][s]) {
for (var j = 0; j < s_boundChans[o][s].length; j++) {
if (s_boundChans[o][s][j].win === w) {
s_boundChans[o][s][j].handler(o, meth, m);
delivered = true;
break;
}
}
}
if (!delivered && s_boundChans['*'] && s_boundChans['*'][s]) {
for (var j = 0; j < s_boundChans['*'][s].length; j++) {
if (s_boundChans['*'][s][j].win === w) {
s_boundChans['*'][s][j].handler(o, meth, m);
break;
}
}
}
}
// otherwise it must have an id (or be poorly formed
else if (typeof i != 'undefined') {
if (s_transIds[i]) s_transIds[i](o, meth, m);
}
};
// Setup postMessage event listeners
if (window.addEventListener) window.addEventListener('message', s_onMessage, false);
else if(window.attachEvent) window.attachEvent('onmessage', s_onMessage);
/* a messaging channel is constructed from a window and an origin.
* the channel will assert that all messages received over the
* channel match the origin
*
* Arguments to Channel.build(cfg):
*
* cfg.window - the remote window with which we'll communicate
* cfg.origin - the expected origin of the remote window, may be '*'
* which matches any origin
* cfg.scope - the 'scope' of messages. a scope string that is
* prepended to message names. local and remote endpoints
* of a single channel must agree upon scope. Scope may
* not contain double colons ('::').
* cfg.debugOutput - A boolean value. If true and window.console.log is
* a function, then debug strings will be emitted to that
* function.
* cfg.debugOutput - A boolean value. If true and window.console.log is
* a function, then debug strings will be emitted to that
* function.
* cfg.postMessageObserver - A function that will be passed two arguments,
* an origin and a message. It will be passed these immediately
* before messages are posted.
* cfg.gotMessageObserver - A function that will be passed two arguments,
* an origin and a message. It will be passed these arguments
* immediately after they pass scope and origin checks, but before
* they are processed.
* cfg.onReady - A function that will be invoked when a channel becomes "ready",
* this occurs once both sides of the channel have been
* instantiated and an application level handshake is exchanged.
* the onReady function will be passed a single argument which is
* the channel object that was returned from build().
*/
return {
build: function(cfg) {
var debug = function(m) {
if (cfg.debugOutput && window.console && window.console.log) {
// try to stringify, if it doesn't work we'll let javascript's built in toString do its magic
try { if (typeof m !== 'string') m = JSON.stringify(m); } catch(e) { }
console.log("["+chanId+"] " + m);
}
};
/* browser capabilities check */
if (!window.postMessage) throw("jschannel cannot run this browser, no postMessage");
if (!window.JSON || !window.JSON.stringify || ! window.JSON.parse) {
throw("jschannel cannot run this browser, no JSON parsing/serialization");
}
/* basic argument validation */
if (typeof cfg != 'object') throw("Channel build invoked without a proper object argument");
if (!cfg.window || !cfg.window.postMessage) throw("Channel.build() called without a valid window argument");
/* we'd have to do a little more work to be able to run multiple channels that intercommunicate the same
* window... Not sure if we care to support that */
if (window === cfg.window) throw("target window is same as present window -- not allowed");
// let's require that the client specify an origin. if we just assume '*' we'll be
// propagating unsafe practices. that would be lame.
var validOrigin = false;
if (typeof cfg.origin === 'string') {
var oMatch;
if (cfg.origin === "*") validOrigin = true;
// allow valid domains under http and https. Also, trim paths off otherwise valid origins.
else if (null !== (oMatch = cfg.origin.match(/^https?:\/\/(?:[-a-zA-Z0-9_\.])+(?::\d+)?/))) {
cfg.origin = oMatch[0].toLowerCase();
validOrigin = true;
}
}
if (!validOrigin) throw ("Channel.build() called with an invalid origin");
if (typeof cfg.scope !== 'undefined') {
if (typeof cfg.scope !== 'string') throw 'scope, when specified, must be a string';
if (cfg.scope.split('::').length > 1) throw "scope may not contain double colons: '::'";
}
/* private variables */
// generate a random and psuedo unique id for this channel
var chanId = (function () {
var text = "";
var alpha = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
for(var i=0; i < 5; i++) text += alpha.charAt(Math.floor(Math.random() * alpha.length));
return text;
})();
// registrations: mapping method names to call objects
var regTbl = { };
// current oustanding sent requests
var outTbl = { };
// current oustanding received requests
var inTbl = { };
// are we ready yet? when false we will block outbound messages.
var ready = false;
var pendingQueue = [ ];
var createTransaction = function(id,origin,callbacks) {
var shouldDelayReturn = false;
var completed = false;
return {
origin: origin,
invoke: function(cbName, v) {
// verify in table
if (!inTbl[id]) throw "attempting to invoke a callback of a nonexistent transaction: " + id;
// verify that the callback name is valid
var valid = false;
for (var i = 0; i < callbacks.length; i++) if (cbName === callbacks[i]) { valid = true; break; }
if (!valid) throw "request supports no such callback '" + cbName + "'";
// send callback invocation
postMessage({ id: id, callback: cbName, params: v});
},
error: function(error, message) {
completed = true;
// verify in table
if (!inTbl[id]) throw "error called for nonexistent message: " + id;
// remove transaction from table
delete inTbl[id];
// send error
postMessage({ id: id, error: error, message: message });
},
complete: function(v) {
completed = true;
// verify in table
if (!inTbl[id]) throw "complete called for nonexistent message: " + id;
// remove transaction from table
delete inTbl[id];
// send complete
postMessage({ id: id, result: v });
},
delayReturn: function(delay) {
if (typeof delay === 'boolean') {
shouldDelayReturn = (delay === true);
}
return shouldDelayReturn;
},
completed: function() {
return completed;
}
};
};
var setTransactionTimeout = function(transId, timeout, method) {
return window.setTimeout(function() {
if (outTbl[transId]) {
// XXX: what if client code raises an exception here?
var msg = "timeout (" + timeout + "ms) exceeded on method '" + method + "'";
(1,outTbl[transId].error)("timeout_error", msg);
delete outTbl[transId];
delete s_transIds[transId];
}
}, timeout);
};
var onMessage = function(origin, method, m) {
// if an observer was specified at allocation time, invoke it
if (typeof cfg.gotMessageObserver === 'function') {
// pass observer a clone of the object so that our
// manipulations are not visible (i.e. method unscoping).
// This is not particularly efficient, but then we expect
// that message observers are primarily for debugging anyway.
try {
cfg.gotMessageObserver(origin, m);
} catch (e) {
debug("gotMessageObserver() raised an exception: " + e.toString());
}
}
// now, what type of message is this?
if (m.id && method) {
// a request! do we have a registered handler for this request?
if (regTbl[method]) {
var trans = createTransaction(m.id, origin, m.callbacks ? m.callbacks : [ ]);
inTbl[m.id] = { };
try {
// callback handling. we'll magically create functions inside the parameter list for each
// callback
if (m.callbacks && s_isArray(m.callbacks) && m.callbacks.length > 0) {
for (var i = 0; i < m.callbacks.length; i++) {
var path = m.callbacks[i];
var obj = m.params;
var pathItems = path.split('/');
for (var j = 0; j < pathItems.length - 1; j++) {
var cp = pathItems[j];
if (typeof obj[cp] !== 'object') obj[cp] = { };
obj = obj[cp];
}
obj[pathItems[pathItems.length - 1]] = (function() {
var cbName = path;
return function(params) {
return trans.invoke(cbName, params);
};
})();
}
}
var resp = regTbl[method](trans, m.params);
if (!trans.delayReturn() && !trans.completed()) trans.complete(resp);
} catch(e) {
// automagic handling of exceptions:
var error = "runtime_error";
var message = null;
// * if it's a string then it gets an error code of 'runtime_error' and string is the message
if (typeof e === 'string') {
message = e;
} else if (typeof e === 'object') {
// either an array or an object
// * if it's an array of length two, then array[0] is the code, array[1] is the error message
if (e && s_isArray(e) && e.length == 2) {
error = e[0];
message = e[1];
}
// * if it's an object then we'll look form error and message parameters
else if (typeof e.error === 'string') {
error = e.error;
if (!e.message) message = "";
else if (typeof e.message === 'string') message = e.message;
else e = e.message; // let the stringify/toString message give us a reasonable verbose error string
}
}
// message is *still* null, let's try harder
if (message === null) {
try {
message = JSON.stringify(e);
/* On MSIE8, this can result in 'out of memory', which
* leaves message undefined. */
if (typeof(message) == 'undefined')
message = e.toString();
} catch (e2) {
message = e.toString();
}
}
trans.error(error,message);
}
}
} else if (m.id && m.callback) {
if (!outTbl[m.id] ||!outTbl[m.id].callbacks || !outTbl[m.id].callbacks[m.callback])
{
debug("ignoring invalid callback, id:"+m.id+ " (" + m.callback +")");
} else {
// XXX: what if client code raises an exception here?
outTbl[m.id].callbacks[m.callback](m.params);
}
} else if (m.id) {
if (!outTbl[m.id]) {
debug("ignoring invalid response: " + m.id);
} else {
// XXX: what if client code raises an exception here?
if (m.error) {
(1,outTbl[m.id].error)(m.error, m.message);
} else {
if (m.result !== undefined) (1,outTbl[m.id].success)(m.result);
else (1,outTbl[m.id].success)();
}
delete outTbl[m.id];
delete s_transIds[m.id];
}
} else if (method) {
// tis a notification.
if (regTbl[method]) {
// yep, there's a handler for that.
// transaction has only origin for notifications.
regTbl[method]({ origin: origin }, m.params);
// if the client throws, we'll just let it bubble out
// what can we do? Also, here we'll ignore return values
}
}
};
// now register our bound channel for msg routing
s_addBoundChan(cfg.window, cfg.origin, ((typeof cfg.scope === 'string') ? cfg.scope : ''), onMessage);
// scope method names based on cfg.scope specified when the Channel was instantiated
var scopeMethod = function(m) {
if (typeof cfg.scope === 'string' && cfg.scope.length) m = [cfg.scope, m].join("::");
return m;
};
// a small wrapper around postmessage whose primary function is to handle the
// case that clients start sending messages before the other end is "ready"
var postMessage = function(msg, force) {
if (!msg) throw "postMessage called with null message";
// delay posting if we're not ready yet.
var verb = (ready ? "post " : "queue ");
debug(verb + " message: " + JSON.stringify(msg));
if (!force && !ready) {
pendingQueue.push(msg);
} else {
if (typeof cfg.postMessageObserver === 'function') {
try {
cfg.postMessageObserver(cfg.origin, msg);
} catch (e) {
debug("postMessageObserver() raised an exception: " + e.toString());
}
}
cfg.window.postMessage(JSON.stringify(msg), cfg.origin);
}
};
var onReady = function(trans, type) {
debug('ready msg received');
if (ready) throw "received ready message while in ready state. help!";
if (type === 'ping') {
chanId += '-R';
} else {
chanId += '-L';
}
obj.unbind('__ready'); // now this handler isn't needed any more.
ready = true;
debug('ready msg accepted.');
if (type === 'ping') {
obj.notify({ method: '__ready', params: 'pong' });
}
// flush queue
while (pendingQueue.length) {
postMessage(pendingQueue.pop());
}
// invoke onReady observer if provided
if (typeof cfg.onReady === 'function') cfg.onReady(obj);
};
var obj = {
// tries to unbind a bound message handler. returns false if not possible
unbind: function (method) {
if (regTbl[method]) {
if (!(delete regTbl[method])) throw ("can't delete method: " + method);
return true;
}
return false;
},
bind: function (method, cb) {
if (!method || typeof method !== 'string') throw "'method' argument to bind must be string";
if (!cb || typeof cb !== 'function') throw "callback missing from bind params";
if (regTbl[method]) throw "method '"+method+"' is already bound!";
regTbl[method] = cb;
return this;
},
call: function(m) {
if (!m) throw 'missing arguments to call function';
if (!m.method || typeof m.method !== 'string') throw "'method' argument to call must be string";
if (!m.success || typeof m.success !== 'function') throw "'success' callback missing from call";
// now it's time to support the 'callback' feature of jschannel. We'll traverse the argument
// object and pick out all of the functions that were passed as arguments.
var callbacks = { };
var callbackNames = [ ];
var seen = [ ];
var pruneFunctions = function (path, obj) {
if (seen.indexOf(obj) >= 0) {
throw "params cannot be a recursive data structure"
}
seen.push(obj);
if (typeof obj === 'object') {
for (var k in obj) {
if (!obj.hasOwnProperty(k)) continue;
var np = path + (path.length ? '/' : '') + k;
if (typeof obj[k] === 'function') {
callbacks[np] = obj[k];
callbackNames.push(np);
delete obj[k];
} else if (typeof obj[k] === 'object') {
pruneFunctions(np, obj[k]);
}
}
}
};
pruneFunctions("", m.params);
// build a 'request' message and send it
var msg = { id: s_curTranId, method: scopeMethod(m.method), params: m.params };
if (callbackNames.length) msg.callbacks = callbackNames;
if (m.timeout)
// XXX: This function returns a timeout ID, but we don't do anything with it.
// We might want to keep track of it so we can cancel it using clearTimeout()
// when the transaction completes.
setTransactionTimeout(s_curTranId, m.timeout, scopeMethod(m.method));
// insert into the transaction table
outTbl[s_curTranId] = { callbacks: callbacks, error: m.error, success: m.success };
s_transIds[s_curTranId] = onMessage;
// increment current id
s_curTranId++;
postMessage(msg);
},
notify: function(m) {
if (!m) throw 'missing arguments to notify function';
if (!m.method || typeof m.method !== 'string') throw "'method' argument to notify must be string";
// no need to go into any transaction table
postMessage({ method: scopeMethod(m.method), params: m.params });
},
destroy: function () {
s_removeBoundChan(cfg.window, cfg.origin, ((typeof cfg.scope === 'string') ? cfg.scope : ''));
if (window.removeEventListener) window.removeEventListener('message', onMessage, false);
else if(window.detachEvent) window.detachEvent('onmessage', onMessage);
ready = false;
regTbl = { };
inTbl = { };
outTbl = { };
cfg.origin = null;
pendingQueue = [ ];
debug("channel destroyed");
chanId = "";
}
};
obj.bind('__ready', onReady);
setTimeout(function() {
postMessage({ method: scopeMethod('__ready'), params: "ping" }, true);
}, 0);
return obj;
}
};
})();

247
common/static/js/capa/src/jsinput.js
View File

@@ -1,37 +1,28 @@
(function (jsinput, undefined) {
/*
* JSChannel (https://github.com/mozilla/jschannel) will be loaded prior to this
* script. We will use it use to let JSInput call 'gradeFn', and eventually
* 'stateGetter' & 'stateSetter' in the iframe's content even if it hasn't the
* same origin, therefore bypassing SOP:
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Same_origin_policy_for_JavaScript
*/
var JSInput = (function ($, undefined) {
// Initialize js inputs on current page.
// N.B.: No library assumptions about the iframe can be made (including,
// most relevantly, jquery). Keep in mind what happens in which context
// when modifying this file.
/* Check whether there is anything to be done */
// When all the problems are first loaded, we want to make sure the
// constructor only runs once for each iframe; but we also want to make
// sure that if part of the page is reloaded (e.g., a problem is
// submitted), the constructor is called again.
if (!jsinput) {
jsinput = {
runs : 1,
arr : [],
exists : function(id) {
jsinput.arr.filter(function(e, i, a) {
return e.id = id;
});
}
};
}
jsinput.runs++;
/* Utils */
// Take a string and find the nested object that corresponds to it. E.g.:
// deepKey(obj, "an.example") -> obj["an"]["example"]
var _deepKey = function(obj, path){
// _deepKey(obj, "an.example") -> obj["an"]["example"]
function _deepKey(obj, path){
for (var i = 0, p=path.split('.'), len = p.length; i < len; i++){
obj = obj[p[i]];
}
@@ -42,115 +33,141 @@
/* END Utils */
function jsinputConstructor(spec) {
function jsinputConstructor(elem) {
// Define an class that will be instantiated for each jsinput element
// of the DOM
// 'that' is the object returned by the constructor. It has a single
// public method, "update", which updates the hidden input field.
var that = {};
/* Private methods */
var sect = $(spec.elem).parent().find('section[class="jsinput"]');
var sectAttr = function (e) { return $(sect).attr(e); };
var thisIFrame = $(spec.elem).
find('iframe[name^="iframe_"]').
get(0);
var cWindow = thisIFrame.contentWindow;
var section = $(elem).parent().find('section[class="jsinput"]'),
sectionAttr = function (e) { return $(section).attr(e); },
iframe = $(elem).find('iframe[name^="iframe_"]').get(0),
cWindow = iframe.contentWindow,
path = iframe.src.substring(0, iframe.src.lastIndexOf("/")+1),
// Get the hidden input field to pass to customresponse
inputField = $(elem).parent().find('input[id^="input_"]'),
// Get the grade function name
gradeFn = sectionAttr("data"),
// Get state getter
stateGetter = sectionAttr("data-getstate"),
// Get state setter
stateSetter = sectionAttr("data-setstate"),
// Get stored state
storedState = sectionAttr("data-stored"),
// Bypass single-origin policy only if this attribute is "false"
// In that case, use JSChannel to do so.
sop = sectionAttr("data-sop"),
channel;
sop = (sop !== "false");
// Get the hidden input field to pass to customresponse
function _inputField() {
var parent = $(spec.elem).parent();
return parent.find('input[id^="input_"]');
}
var inputField = _inputField();
// Get the grade function name
var getGradeFn = sectAttr("data");
// Get state getter
var getStateGetter = sectAttr("data-getstate");
// Get state setter
var getStateSetter = sectAttr("data-setstate");
// Get stored state
var getStoredState = sectAttr("data-stored");
// Put the return value of gradeFn in the hidden inputField.
var update = function () {
var ans;
ans = _deepKey(cWindow, gradeFn)();
// setstate presumes getstate, so don't getstate unless setstate is
// defined.
if (getStateGetter && getStateSetter) {
var state, store;
state = unescape(_deepKey(cWindow, getStateGetter)());
store = {
answer: ans,
state: state
};
inputField.val(JSON.stringify(store));
} else {
inputField.val(ans);
}
return;
};
if (!sop) {
channel = Channel.build({
window: cWindow,
origin: path,
scope: "JSInput"
});
}
/* Public methods */
// Only one public method that updates the hidden input field.
var update = function (callback) {
var answer, state, store;
that.update = update;
if (sop) {
answer = _deepKey(cWindow, gradeFn)();
// Setting state presumes getting state, so don't get state
// unless set state is defined.
if (stateGetter && stateSetter) {
state = unescape(_deepKey(cWindow, stateGetter)());
store = {
answer: answer,
state: state
};
inputField.val(JSON.stringify(store));
} else {
inputField.val(answer);
}
callback();
} else {
channel.call({
method: "getGrade",
params: "",
success: function(val) {
answer = decodeURI(val.toString());
// Setting state presumes getting state, so don't get
// state unless set state is defined.
if (stateGetter && stateSetter) {
channel.call({
method: "getState",
params: "",
success: function(val) {
state = decodeURI(val.toString());
store = {
answer: answer,
state: state
};
inputField.val(JSON.stringify(store));
callback();
}
});
} else {
inputField.val(answer);
callback();
}
}
});
}
};
/* Initialization */
jsinput.arr.push(that);
// Put the update function as the value of the inputField's "waitfor"
// attribute so that it is called when the check button is clicked.
function bindCheck() {
inputField.data('waitfor', that.update);
return;
}
var gradeFn = getGradeFn;
bindCheck();
inputField.data('waitfor', update);
// Check whether application takes in state and there is a saved
// state to give it. If getStateSetter is specified but calling it
// state to give it. If stateSetter is specified but calling it
// fails, wait and try again, since the iframe might still be
// loading.
if (getStateSetter && getStoredState) {
var sval, jsonVal;
if (stateSetter && storedState) {
var stateValue, jsonValue;
try {
jsonVal = JSON.parse(getStoredState);
jsonValue = JSON.parse(storedState);
} catch (err) {
jsonVal = getStoredState;
jsonValue = storedState;
}
if (typeof(jsonVal) === "object") {
sval = jsonVal["state"];
if (typeof(jsonValue) === "object") {
stateValue = jsonValue["state"];
} else {
sval = jsonVal;
stateValue = jsonValue;
}
// Try calling setstate every 200ms while it throws an exception,
// up to five times; give up after that.
// (Functions in the iframe may not be ready when we first try
// calling it, but might just need more time. Give the functions
// more time.)
// 200 ms and 5 times are arbitrary but this has functioned with the
// only application that has ever used JSInput, jsVGL. Something
// more sturdy should be put in place.
function whileloop(n) {
if (n < 5){
try {
_deepKey(cWindow, getStateSetter)(sval);
if (sop) {
_deepKey(cWindow, stateSetter)(stateValue);
} else {
channel.call({
method: "setState",
params: stateValue,
success: function() {
}
});
}
} catch (err) {
setTimeout(whileloop(n+1), 200);
}
@@ -160,40 +177,44 @@
}
}
whileloop(0);
}
return that;
}
function walkDOM() {
var newid;
var dataProcessed, all;
// Find all jsinput elements, and create a jsinput object for each one
var all = $(document).find('section[class="jsinput"]');
// Find all jsinput elements
allSections = $('section.jsinput');
all.each(function(index, value) {
// Get just the mako variable 'id' from the id attribute
newid = $(value).attr("id").replace(/^inputtype_/, "");
if (!jsinput.exists(newid)){
var newJsElem = jsinputConstructor({
id: newid,
elem: value,
});
// When a JSInput problem loads, its data-processed attribute is false,
// so the jsconstructor will be called for it.
// The constructor will not be called again on subsequent reruns of
// this file by other JSInput. Only if it is reloaded, either with the
// rest of the page or when it is submitted, will this constructor be
// called again.
allSections.each(function(index, value) {
dataProcessed = ($(value).attr("data-processed") === "true");
if (!dataProcessed) {
jsinputConstructor(value);
$(value).attr("data-processed", 'true');
}
});
}
// This is ugly, but without a timeout pages with multiple/heavy jsinputs
// don't load properly.
// 300 ms is arbitrary but this has functioned with the only application
// that has ever used JSInput, jsVGL. Something more sturdy should be put in
// place.
if ($.isReady) {
setTimeout(walkDOM, 300);
} else {
$(document).ready(setTimeout(walkDOM, 300));
}
})(window.jsinput = window.jsinput || false);
return {
jsinputConstructor: jsinputConstructor,
walkDOM: walkDOM
};
})(window.jQuery);

3
common/static/js_test.yml
View File

@@ -42,11 +42,13 @@ lib_paths:
src_paths:
- coffee/src
- js/src
- js/capa/src
# Paths to spec (test) JavaScript files
spec_paths:
- coffee/spec
- js/spec
- js/capa/spec
# Regular expressions used to exclude *.js files from
# appearing in the test runner page.
@@ -72,4 +74,5 @@ spec_paths:
# plus the path to the file (relative to this YAML file)
fixture_paths:
- js/fixtures
- js/capa/fixtures

6
docs/data/source/course_data_formats/jsinput.rst
View File

@@ -1,12 +1,6 @@
##############################################################################
JS Input
##############################################################################
**NOTE**
*Do not use this feature yet! Its attributes and behaviors may change
without any concern for backwards compatibility. Moreover, it has only been
tested in a very limited context. If you absolutely must, contact Julian
(julian@edx.org). When the feature stabilizes, this note will be removed.*
This document explains how to write a JSInput input type. JSInput is meant to
allow problem authors to easily turn working standalone HTML files into