Purpose of isLoaded on jQuery?

Question

I have the below jQuery code in my start.js file. My question is could anyone tell me what the isLoaded: !!(window.jQuery && jQuery.cookie) code segment does?

Sys.loader.defineScripts(
    {
        releaseUrl: '~/scripts/jquery/{0}/jquery.{0}.min.js',
        debugUrl: '~/scripts/jquery/{0}/jquery.{0}.js'
    }, 
    [
        { name: 'blockUI', dependencies: ['jQueryUI'], isLoaded: !!(window.jQuery && jQuery.blockUI) },
        { name: 'rating', dependencies: ['jQuery'], isLoaded: !!(window.jQuery && jQuery.rating) },
        { name: 'watermark', dependencies: ['jQuery'], isLoaded: !!(window.jQuery && jQuery.fn.watermark) },
        { name: 'mousewheel', dependencies: ['jQuery'], isLoaded: !!(window.jQuery && jQuery.event.special.mousewheel) },
        { name: 'cookie', dependencies: ['jQuery'], isLoaded: !!(window.jQuery && jQuery.cookie) },
        { name: 'tmpl', dependencies: ['jQuery'], isLoaded: !!(window.jQuery && jQuery.fn.tmpl) },
        { name: 'maskedinput', dependencies: ['jQuery'], isLoaded: !!(window.jQuery && jQuery.fn.maskedinput) },
        { name: 'ba-bbq', dependencies: ['jQuery'], isLoaded: !!(window.jQuery && jQuery.bbq) },
        { name: 'validate', dependencies: ['jQuery'], isLoaded: !!(window.jQuery && jQuery.fn.validate) },
        { name: 'form', dependencies: ['jQuery'], isLoaded: !!(window.jQuery && jQuery.fn.ajaxForm) },
    ]
);

@FrédéricHamidi I don't know some one who changed my question. My question is what does "isLoaded" do on above code snippet ? — Sampath, Aug 06 '13 at 08:23

score 0 · Answer 1 · answered Aug 06 '13 at 08:18

0

!! always retrun boolean value. either true or false.

In some languages nil or false consider as false in boolean expression and everything else is consider as true for boolean expression.

but in order to get boolean true/false you can use !!

answered Aug 06 '13 at 08:18

Salil

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Do you have any idea about the meaning of "isLoaded" ? – Sampath Aug 06 '13 at 08:20

Purpose of isLoaded on jQuery?

1 Answers1