How do I check whether jQuery is loaded in the page or not? I have to run a jQuery script which has a jQuery library link, but when I use the code I want to make sure to load that file only if the page does not have any jQuery file, otherwise use that file. Any suggestions?
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4 Answers
if (typeof jQuery == 'undefined') { // This means jQuery is not loaded } Also, take a look at yepnope.js, it allows you to load different JavaScript files based on if certain conditions are true or false.
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if (typeof jQuery != 'undefined') { // jQuery is loaded } 
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The simplest:
if( window.jQuery ) { // you code here } 
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To check if jQuery is loaded on the page try:
if (!(window.jQuery || window.$)){ //then load it } else { //already loaded } 