How to check that a div exists jquery and if it does do nothing

2018-06-04 12:24:59

This question already has an answer here:

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

检查一个jQuery对象的长度属性

if($('div.errormsg').length==0)
{
 //Not exists, so redirect
 //window.location.href='newurl';
}

change this:

if (document.getElementById('.errormsg')) {

to this:

if (document.getElementsByClassName('errormsg').length) {

document.getElementsByClassName docs @ MDN

您可以使用.length属性来检查元素/元素的存在性：

if(!$('.errormsg ').length){//does ot exist
  //redirect
}

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