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ENHANCEMENT Added .cms-panel-deferred for lazy loading of CMS panels (for performance reasons)

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This commit is contained in:
Ingo Schommer 2012-04-17 17:17:45 +02:00
parent 37777615cf
commit d6eb1b6fff
1 changed files with 46 additions and 1 deletions
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47
admin/javascript/LeftAndMain.js
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@ -330,7 +330,7 @@ jQuery.noConflict();
*/
$('.cms .cms-panel-link').entwine({
onclick: function(e) {
var href = this.attr('href'), url = href ? href : this.data('href'),
var href = this.attr('href'), url = (href && !href.match(/^#/)) ? href : this.data('href'),
data = (this.data('targetPanel')) ? {selector: this.data('targetPanel')} : null;
$('.cms-container').loadPanel(url, null, data);
@ -561,6 +561,51 @@ jQuery.noConflict();
e.preventDefault();
}
});
/**
* Allows to lazy load a panel, by leaving it empty
* and declaring a URL to load its content via a 'url' HTML5 data attribute.
* The loaded HTML is cached, with cache key being the 'url' attribute.
* In order for this to work consistently, we assume that the responses are stateless.
* To avoid caching, add a 'deferred-no-cache' to the node.
*/
window._panelDeferredCache = {};
$('.cms-panel-deferred').entwine({
onmatch: function() {
this._super();
this.redraw();
},
onunmatch: function() {
// Save the HTML state at the last possible moment.
// Don't store the DOM to avoid memory leaks.
if(!this.data('deferredNoCache')) window._panelDeferredCache[this.data('url')] = this.html();
this._super();
},
redraw: function() {
var self = this, url = this.data('url');
if(!url) throw 'Elements of class .cms-panel-deferred need a "data-url" attribute';
this._super();
// If the node is empty, try to either load it from cache or via ajax.
if(!this.children().length) {
if(!this.data('deferredNoCache') && typeof window._panelDeferredCache[url] !== 'undefined') {
this.html(window._panelDeferredCache[url]);
} else {
this.addClass('loading');
$.ajax({
url: url,
complete: function() {
self.removeClass('loading');
},
success: function(data, status, xhr) {
self.html(data);
}
});
}
}
}
});
}(jQuery));