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Javascript node link instance analysis

Source: Internet
Author: User
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Javascript node link instance analysis

This article analyzes the node relationship of Javascript. Share it with you for your reference. The details are as follows:

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<Html xmlns = "http://www.w3.org/1999/xhtml">

<Head>

<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>

<Title> node relationship </title>

<Script type = "text/javascript">

Function Demo (){

Var divObj = document. getElementById ("divDemo ");

// Obtain the parent node

Var parentNode = divObj. parentNode;

// DisplayNodeInfo (parentNode );

// Obtain the subnode

Var childNodes = divObj. childNodes;

// The subnode returns a set, that is, an array.

// Alert (childNodes. length); // displays the number of nodes.

// DisplayNodeInfo (childNodes [0]);

// Obtain the sibling Node

// ---------- Obtain the previous sibling Node

Var preBrotherNode = divObj. previussibling. previussibling;

// When empty rows exist between labels, a blank text node will appear. Be sure to pay attention when obtaining nodes.

// DisplayNodeInfo (preBrotherNode );

// ---------- Get the next sibling Node

Var nextBrotherNode = divObj. nextSibling;

DisplayNodeInfo (nextBrotherNode );

}

Function displayNodeInfo (node ){

Alert ("Name:" + node. nodeName + ", Type:" + node. nodeType + ", Value:" + node. nodeValue );

}

</Script>

</Head>

<Body>

<Input type = "button" value = "test" onclick = "Demo ()"/>

<Div id = "divDemo"> div content </div>

<Table>

<Tr>

<Td> cell 1 </td>

<Td> Cell 2 </td>

</Tr>

<Tr>

<Td> cell 3 </td>

<Td> cell 4 </td>

</Tr>

</Table>

</Body>

</Html>

I hope this article will help you design javascript programs.

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