CODEWITHSUNDEEP
javascriptjquery
mcont
mcont

Reputation: 1922

Include jQuery using code

I must include jQuery in a page using code:

if (typeof window.jQuery === "undefined") {
    document.write('<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"><\/script>');
    if (typeof Prototype !== "undefined") {
        document.write('<script>jQuery.noConflict();<\/script>');
    }
}

But then if I try to use jQuery, Firebug logs "jQuery undefined".

jQuery(document).ready(function() {
    //
});

but jquery is correctly loaded

jQuery

Upvotes: 1

Views: 185

Answers (3)

Alexander Wigmore
Alexander Wigmore

Reputation: 3186

The way the HTML5 boilerplate does it is the most efficient way.

<script>window.jQuery || document.write('<script src="js/vendor/jquery-1.8.0.min.js"><\/script>')</script>

This will check to see if jQuery has been defined yet (I.e loaded), or (if not) it will load write the script to the page :).

Upvotes: 1

Musa
Musa

Reputation: 97672

I would suggest against using document.write, use dom manipulation.

if (typeof window.jQuery === "undefined") {
    var script = document.createElement('script');
    script.onload = function(){
        if (typeof Prototype !== "undefined") {
            jQuery.noConflict();
        }
    }
    script.src = 'http://code.jquery.com/jquery-latest.min.js';
    document.getElementsByTagName('head')[0].appendChild(script);   
}

http://jsfiddle.net/ALCDr/

Upvotes: 3

Peter
Peter

Reputation: 16923

window.onload = function() {
  jQuery(document).ready(function() {
    alert('!');
  });
}

do the trick.

Upvotes: 1

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