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javascript - How can I count the number of elements with same class?

I have a main div in my page with a specific id. Now some input elements of the same class are present in this div. So how can I count the number of these elements of same class in this div using jQuery?

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With jQuery you can use

$('#main-div .specific-class').length

otherwise in VanillaJS (from IE8 included) you may use

document.querySelectorAll('#main-div .specific-class').length;

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