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How does jquery determine whether a dom element exists?

青灯夜游
Release: 2021-11-12 18:44:00
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Jquery method to determine whether a dom element exists: 1. Use the "$("#id")" statement to obtain the dom element object through the id attribute; 2. Use the "element object.length" statement to obtain the length value; 3. Determine whether the obtained length value is greater than 0. If it is greater, it exists, otherwise it does not exist.

How does jquery determine whether a dom element exists?

The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.

jquery determines whether the dom element exists

Implementation idea:

  • Pass in the js file The id attribute gets the dom element object

  • Use the length attribute to get the length of the dom element object, If the element exists, length=1

  • Determine whether the length value is greater than 0

##Implementation code:

if($("#id").length >0){
//元素存在,则length=1
 alert("元素存在");
}else{
 
  //元素不存在,则length=0
 alert("元素不存在");
}
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