Getting the CLASS object of of with native JS is simple and useful
- 2020-03-30 04:07:15
- OfStack
It is said to be the most commonly used... I came up with it from watching dom programming art.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> Headless document </title>
<style>
.ca{background-color:red; padding:20px;}
.js{ border:1px solid #00F; padding:10px;}
</style>
</head>
<body>
<div class="ca">
sss
</div>
<div class="js" id="as">
</div>
<div class="bd">
</div>
<div class="ca">
</div>
</body>
</html>
<script>
function getElementsClass(classnames){
var classobj= new Array();//Define an array
var classint=0;//Defines the index of the array
var tags=document.getElementsByTagName("*");//Gets all tags of HTML
for(var i in tags){//The label is traversed
if(tags[i].nodeType==1){//Judge node type
if(tags[i].getAttribute("class") == classnames)//Determines and requires the same CLASS name and forms an array
{
classobj[classint]=tags[i];
classint++;
}
}
}
return classobj;//Returns the composed array
}
//Here's the test
var a=getElementsClass("ca");
a[0].onclick=function(){alert(" Here we come ");}
a[1].innerHTML=' Here we come ';
</script>
Sometimes more than one dom class is the same, so you can do this:
var a=getElementsClass("ca") ;
for(var i=0;i<a.length;i++){
(function(i){
alert(a[i])
})(i)
}
If you have more than one same class, you can use it together. If you want to reach JQ, where can you directly. Click also needs to do some complicated processing