How to check htmlElement object exists in DOM

This question already has an answer here:

Is there an “exists” function for jQuery? 36 answers

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您可以检查DOM是否包含htmlElement

if ($.contains(document, $(htmlElement)){
    // htmlElement is attached to the DOM
}

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In order to give proper condition you always need to check length of object

ie if($("li.k-button.k-state-hover").length)

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试用javascript：

var ele =  document.getElementById('yourId');

 or

var ele = document.getElementByTagName('tag name');

if (typeof(ele) != 'undefined' && ele != null)
{
  // exists.
}

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