检查 jQuery [ duplicate ]中是否存在元素

Question

This question already has an answer here:

• Is there an “exists” function for jQuery? 38 answers

How do I check if an element exists if the element is created by .append() method? $('elemId').length doesn't work for me.

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转载于:https://stackoverflow.com/questions/4592493/check-if-element-exists-in-jquery

Answer 1

$('elemId').length doesn't work for me.

You need to put # before element id:

$('#elemId').length
---^

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With vanilla JavaScript, you don't need the hash (#) e.g. document.getElementById('id_here') , however when using jQuery, you do need to put hash to target elements based on id just like CSS.