Files
edx-platform/common/static/js/capa/annotationinput.js
2013-02-27 01:44:07 -05:00

98 lines
3.2 KiB
JavaScript

(function () {
var debug = false;
var module = {
debug: debug,
inputSelector: '.annotation-input',
tagSelector: '.tag',
tagsSelector: '.tags',
commentSelector: 'textarea.comment',
valueSelector: 'input.value', // stash tag selections and comment here as a JSON string...
singleSelect: true,
init: function() {
var that = this;
if(this.debug) { console.log('annotation input loaded: '); }
$(this.inputSelector).each(function(index, el) {
if(!$(el).data('listening')) {
$(el).delegate(that.tagSelector, 'click', $.proxy(that.onClickTag, that));
$(el).delegate(that.commentSelector, 'change', $.proxy(that.onChangeComment, that));
$(el).data('listening', 'yes');
}
});
},
onChangeComment: function(e) {
var value_el = this.findValueEl(e.target);
var current_value = this.loadValue(value_el);
var target_value = $(e.target).val();
current_value.comment = target_value;
this.storeValue(value_el, current_value);
},
onClickTag: function(e) {
var target_el = e.target, target_value, target_index;
var value_el, current_value;
value_el = this.findValueEl(e.target);
current_value = this.loadValue(value_el);
target_value = $(e.target).data('id');
if(!$(target_el).hasClass('selected')) {
if(this.singleSelect) {
current_value.options = [target_value]
} else {
current_value.options.push(target_value);
}
} else {
if(this.singleSelect) {
current_value.options = []
} else {
target_index = current_value.options.indexOf(target_value);
if(target_index !== -1) {
current_value.options.splice(target_index, 1);
}
}
}
this.storeValue(value_el, current_value);
if(this.singleSelect) {
$(target_el).closest(this.tagsSelector)
.find(this.tagSelector)
.not(target_el)
.removeClass('selected')
}
$(target_el).toggleClass('selected');
},
findValueEl: function(target_el) {
var input_el = $(target_el).closest(this.inputSelector);
return $(this.valueSelector, input_el);
},
loadValue: function(value_el) {
var json = $(value_el).val();
var result = JSON.parse(json);
if(result === null) {
result = {};
}
if(!result.hasOwnProperty('options')) {
result.options = [];
}
if(!result.hasOwnProperty('comment')) {
result.comment = '';
}
return result;
},
storeValue: function(value_el, new_value) {
var json = JSON.stringify(new_value);
$(value_el).val(json);
}
}
module.init();
}).call(this);