JQuery - Tips: Difference between revisions
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var subset = $(""); | var subset = $(""); | ||
$("input[value^='']", subset); | $("input[value^='']", subset); | ||
<br> | |||
2. Set Context and improve the performance | 2. Set Context and improve the performance | ||
On the core jQuery function, specify the context parameter when. Specifying the context parameter allows jQuery to start from a deeper branch in the DOM, rather than from the DOM root. Given a large enough DOM, specifying the context parameter should translate to performance gains. | On the core jQuery function, specify the context parameter when. Specifying the context parameter allows jQuery to start from a deeper branch in the DOM, rather than from the DOM root. Given a large enough DOM, specifying the context parameter should translate to performance gains. | ||
$("input:radio", document.forms[0]); | $("input:radio", document.forms[0]); | ||
<br> | |||
3. Live Event Handlers | 3. Live Event Handlers | ||
Set an event handler for any element that matches a selector, even if it gets added to the DOM after the initial page load: | Set an event handler for any element that matches a selector, even if it gets added to the DOM after the initial page load: | ||
$('button.someClass').live('click', someFunction); | $('button.someClass').live('click', someFunction); | ||
<br> | |||
Revision as of 10:23, 22 April 2010
1. Optimize performance of complex selectors
var subset = $("");
$("input[value^=]", subset);
2. Set Context and improve the performance
On the core jQuery function, specify the context parameter when. Specifying the context parameter allows jQuery to start from a deeper branch in the DOM, rather than from the DOM root. Given a large enough DOM, specifying the context parameter should translate to performance gains.
$("input:radio", document.forms[0]);
3. Live Event Handlers
Set an event handler for any element that matches a selector, even if it gets added to the DOM after the initial page load:
$('button.someClass').live('click', someFunction);