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[JavaScript] Dom Basics

Source: Internet
Author: User
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Dom is the document.

Compatibility conditions

-ie6~8 10%

-chrome 60%

-ff 99%

DOM node

Child nodes

-childnodes contains text nodes and ELEMENT nodes//ie6-8

ABCDE text node <SPAN>ABCD element node </span>

-nodetype return node type

NodeType = = 3 Text node

NodeType = = 1 element node

<script>function() {    var oul=document.getelementbyid (' ul1 ');      for (var i=0;i<ali.length;i++) {        if(oul.childnodes[i].nodestype = = 1) {           = ' red ';}}    } </script><body><ul id= "UL1" >    <li></li>    <li></li></ul> </body>

-children includes only elements, not text

Parent node

-parentnode

<script>window.onload=function(){  varAa=document.getelementsbytagnaame (' a ');  for(vari=0;i<aa.length;i++) {Aa[i].onclick=function(){         This. ParentNode.style.display = ' None '; }    }}</script><body><ul> <li>111<a href= "JavaScript" > Hide </a></li> <li> 222<a href= "JavaScript" > Hide </a></li> <li>333<a href= "JavaScript" > Hide </a></li > <li>444<a href= "javascript" > Hide </a></li> <li>555<a href= "JavaScript" > Hidden </a></li></ul></body>

-offsetperent get the actual position of the element on the page

-firstchild Gets the first child node//ie6-8

-firstelementchild//chrome, FF

Compatibility issue Resolution

<script>function() {   var oul = document.getElementById (' ul1 ');     if (oul.firstelementchild) {        = ' red ';    }     Else (oul.firstchild) {       = ' red ';    }} </script><body><ul id = "UL1" >    <li></li>    <li></li>    < li></li>    <li></li>    <li></li><ul></body>

Element Property Manipulation

-getattribute (name) get

-setattribute (name, value) settings

-removeattribue (name) Delete

Get elements with classname

<script>functionGetbyclass (oparent,sclass) {varAele = Oparent.getelementsbytagname (' * ')); varAresult = [];  for(vari=0;i<aele.length;i++){        if(Aele[i].classname = =Sclass)         {Aresult.push (aele[i]); }    }    returnAresult;} Window.onload=function(){    varOul = document.getElementById (' ul1 ')); varAbox = Getbyclass (Oul, ' box ');  for(vari=0;i<abox.length;i++) {Abox[i].style.background= ' Red '; }}</script>
[JavaScript] Dom Basics

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