Testing if an element has a certain class with jQuery

I'm trying to test for the presence of class intra-field-label on an element. This element wi开发者_如何学JAVAll have multiple classes. How may I do this?

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Use hasClass()

http://api.jquery.com/hasClass/

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if ($("#yourelementid").hasClass("intra-field-label")) {
    // your code goes here
}

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For completeness, there's also .is() which takes any jQuery selector. This is more flexible, but for your particular case, Phil's answer is more appropriate.

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The jquery selector for class is ".class", http://api.jquery.com/class-selector/

$('.intra-field-label')