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Select a usage instance for the DOM check box in javascript

Source: Internet
Author: User
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Select a usage instance for the DOM check box in javascript

This example describes how to select the DOM check box in 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> check box select all clear and reselect </title>

<Script type = "text/javascript">

// Retrieve the array of all check box objects

Function GetAllCheckBox (){

Var div = document. getElementById ("bils ");

Var inputs = div. getElementsByTagName ("input ");

// Define an array of check boxes to return

Var checkboxs = new Array ();

Var nIndex = 0;

For (var I = 0; I <inputs. length; I ++ ){

// Determine the check box by checking whether the type is checkbox

If (inputs [I]. type = "checkbox "){

Checkboxs [nIndex] = inputs [I];

NIndex ++;

}

}

Return checkboxs;

}

// Select all

Function selAll (){

Var checkboxs = GetAllCheckBox ();

For (var I = 0; I <checkboxs. length; I ++ ){

Checkboxs [I]. checked = true;

}

}

// Clear all

Function clearAll (){

Var checkboxs = GetAllCheckBox ();

For (var I = 0; I <checkboxs. length; I ++ ){

Checkboxs [I]. checked = false;

}

}

// Invert Selection

Function reverseAll (){

Var checkboxs = GetAllCheckBox ();

For (var I = 0; I <checkboxs. length; I ++ ){

If (checkboxs [I]. checked = true ){

Checkboxs [I]. checked = false;

}

Else {

Checkboxs [I]. checked = true;

}

}

}

</Script>

</Head>

<Body>

<Div id = "bils">

<Input type = "checkbox" id = "c1"/> <label for = "c1"> football </label>

<Input type = "checkbox" id = "c2"/> <label for = "c2"> billiards </label>

<Input type = "checkbox" id = "c3"/> <label for = "c3"> Table Tennis </label>

<Br/>

<Input type = "button" value = "select all" onclick = "selAll ()"/>

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

<Input type = "button" value = "invert" onclick = "reverseAll ()"/>

</Div>

</Body>

</Html>

I hope this article will help you design javascript programs.

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