Execute my jQuery script after dynamically inserted jQuery library has finished loading

Question

I am dynamically inserting the jQuery library on a page via <script> tag:

jq = document.createElement('script');
jq.setAttribute('src','//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js');
b.appendChild(jq);

Then I have some jQuery script that needs to run after the jQuery library has finished loading and is ready for use:

$(f).load(function() {
    $(f).fadein(1000);
});

How can I make it wait for jQuery to load?

Rob's answer below is perfect, though let me shimmy on here that what you're doing is (a good) part of what Modernizr was made for. :D — Richard Neil Ilagan
– Richard Neil Ilagan, Commented Jan 14, 2012 at 19:25

Rob W · Accepted Answer · 2012-01-14 18:33:25Z

14

Specify an onload event at the to-be-inserted script tag:

function onLoad() {
    $(f).load(function() {
        $(f).fadein(1000);
    });
}

jq = document.createElement('script');
jq.onload = onLoad;   // <-- The magic
jq.src = '//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js';
b.appendChild(jq);

An alternative way, if you cannot control the script insertion code, you can use a poller:

(function() {
    function onLoad() { ... } // Code to be run

    if ('jQuery' in window) onLoad();
    else {
        var t = setInterval(function() { // Run poller
            if ('jQuery' in window) {
                onLoad();
                clearInterval(t);        // Stop poller
            }
        }, 50);
    }
})();

answered Jan 14, 2012 at 18:33

Rob W

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