jQuery: How to test or check whether an element exists

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.length property in JavaScript returns the length or number of elements inside an array or the string length. While jQuery selector mechanism $(“elm”) returns an array of DOM objects (such as elements), you can also get the number of the length of the returned objects array by:

$("#some").length

To check the existence of the element, just check if the returned value of length is zero:

if ($("#some").length) { //#some element exists }