how to group multiple filter selectors?

How can I select first checked checkbox from div with class "site"?

I guess it should be 开发者_开发知识库something like that but this doesnt work:

$(".site :checkbox :checked :first")

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remove the spaces

$(".site :checkbox:first:checked")

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Use $('.site input:checkbox:checked:first")

It searches for input tags that are checked checkboxes below .site and then returns the first element that matches these criteria.

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$(".site input[type='checkbox']:checked:first")

Demo: http://jsfiddle.net/TRAk2/

Use the Attribute Equal Selector to select the type of an input.

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$(".site :checkbox")[0].checked);

Demo: http://jsfiddle.net/nyus6/