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Optimizing code. Caching an element selector.

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This commit is contained in:
Valera Rozuvan
2013-08-14 11:56:13 +03:00
parent 99ae63777e
commit b583a4e793
1 changed files with 25 additions and 23 deletions
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48
common/lib/xmodule/xmodule/js/src/video/08_video_speed_control.js
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@@ -77,6 +77,8 @@ function () {
* @returns {undefined}
*/
function _bindHandlers(state) {
var speedLinks;
state.videoSpeedControl.videoSpeedsEl.find('a')
.on('click', state.videoSpeedControl.changeVideoSpeed);
@@ -146,29 +148,29 @@ function () {
// ******************************
// Attach 'focus', and 'blur' events to elements which represent
// individual speed entries.
state.videoSpeedControl.videoSpeedsEl.find('a.speed_link:last')
.on('blur', function () {
// If we have reached the last speed entry, and the focus
// changes to the next element, we need to hide the speeds
// control drop-down.
state.videoSpeedControl.el.removeClass('open');
});
state.videoSpeedControl.videoSpeedsEl.find('a.speed_link:first')
.on('blur', function () {
// This flag will indicate that the focus to the next
// element that will receive it is comming from the first
// speed entry.
//
// This flag will be used to correctly handle scenario of
// tabbing backwards.
state.firstSpeedBlur = true;
});
state.videoSpeedControl.videoSpeedsEl.find('a.speed_link')
.on('focus', function () {
// Clear the flag which is only set when we are un-focusing
// (the blur event) from the first speed entry.
state.firstSpeedBlur = false;
});
speedLinks = state.videoSpeedControl.videoSpeedsEl
.find('a.speed_link');
speedLinks.last().on('blur', function () {
// If we have reached the last speed entry, and the focus
// changes to the next element, we need to hide the speeds
// control drop-down.
state.videoSpeedControl.el.removeClass('open');
});
speedLinks.first().on('blur', function () {
// This flag will indicate that the focus to the next
// element that will receive it is comming from the first
// speed entry.
//
// This flag will be used to correctly handle scenario of
// tabbing backwards.
state.firstSpeedBlur = true;
});
speedLinks.on('focus', function () {
// Clear the flag which is only set when we are un-focusing
// (the blur event) from the first speed entry.
state.firstSpeedBlur = false;
});
}
}