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The javascript list box is left and right, compatible with IE and ff. Useful

Source: Internet
Author: User
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<HTML>
<Head>
<Title> move the Javascript list box left and right </title>
<Style type = "text/CSS">
Select {width: 100px; Height: 100px ;}
</Style>
<SCRIPT type = "text/JavaScript">
Function roveright (){
VaR lbox = Document. getelementbyid ("leftbox ");
VaR rbox = Document. getelementbyid ("rightbox ");
VaR COUNT = 0;

For (I = 0; I <lbox. length; I ++ ){
If (lbox [I]. Selected ){
// Add an option: New Option (text, value)
Rbox. Options. Add (New Option (lbox [I]. Text, lbox. Value ));
Count ++;
}
}
// The loop is used to delete multiple options at the same time.
For (I = 0; I <count; I ++ ){
Lbox. Remove (lbox. selectedindex );
}
}
Function roveleft (){
VaR lbox = Document. getelementbyid ("leftbox ");
VaR rbox = Document. getelementbyid ("rightbox ");
VaR COUNT = 0;

For (I = 0; I <rbox. length; I ++ ){
If (rbox [I]. Selected ){
Lbox. Options. Add (New Option (rbox [I]. Text, rbox. Vale ));
Count ++;
}
}
For (I = 0; I <count; I ++ ){
Rbox. Remove (rbox. selectedindex );
}
}

</SCRIPT>
</Head>
<Body>
<Select id = "leftbox" multiple = "multiple">
<Option value = "Beijing"> Beijing </option>
<Option value = "Shanghai"> Shanghai </option>
<Option value = "Guangzhou"> Guangzhou </option>
<Option value = "Shenzhen"> Shenzhen </option>
</SELECT>
<Input type = "button" id = "addbtn" onclick = "roveright ();" value = ">>>"/>
<Input type = "button" id = "addbtn" onclick = "roveleft ();" value = "<"/>
<Select id = "rightbox" multiple = "multiple">
<Option value = "Chengdu"> Chengdu </option>
<Option value = "Shenzhen"> Shenzhen </option>
<Option value = "Nanjing"> Nanjing </option>
<Option value = "Tianjin"> Tianjin </option>
</SELECT>
</Body>
</Html>

 

A troublesome function previously written:

// Function additem (){
// Var dsource = Document. getelementbyid ("leftbox ");
// Var dresult = Document. getelementbyid ("rightbox ");
// Var selindex = dsource. selectedindex;
//
/// Add an option: New Option (text, value)
// Dresult. Options [dresult. Options. Length] = New Option (dsource. Value, dsource. value );
// If (document. All ){
// Dsource. Options [selindex]. removenode (true );
//}
// Else {
// Dsource. removechild (dsource. childnodes [selindex]);
//}
//}

 

Because Firefox does not support removenode, You need to determine whether the browser should use different ones. Firefox should use removechild ()

 

/* Improved OO method recently */

<HTML>
<Head>
<Title> move the class left and right in the Javascript list box </title>
<Style type = "text/CSS">
Select {width: 100px; Height: 100px ;}
</Style>
</Head>
<Body>
<Select id = "leftbox" multiple = "multiple">
<Option value = "Beijing"> Beijing </option>
<Option value = "Shanghai"> Shanghai </option>
<Option value = "Guangzhou"> Guangzhou </option>
<Option value = "Shenzhen"> Shenzhen </option>
</SELECT>
<Input type = "button" id = "goright" value = ">>>"/>
<Input type = "button" id = "goleft" value = "<"/>
<Select id = "rightbox" multiple = "multiple">
<Option value = "Chengdu"> Chengdu </option>
<Option value = "Shenzhen"> Shenzhen </option>
<Option value = "Nanjing"> Nanjing </option>
<Option value = "Tianjin"> Tianjin </option>
</SELECT>
<SCRIPT type = "text/JavaScript">
// Constructor
Function moveselect (selector ){
This. S1 = selector. select1;
This. S2 = selector. select2;
This. T1 = selector. button1;
This. T2 = selector. button2;
// This. Move (); // used directly after instantiation
}

// Use the prototype Extension Method
Moveselect. Prototype = {
Move: function (){
VaR _ Self = this;
_ Self. t1.onclick = function (){
VaR COUNT = 0;
For (VAR I = 0; I <_ Self. s1.length; I ++ ){
If (_ Self. S1 [I]. Selected ){
_ Self. s2.options. Add (New Option (_ Self. S1 [I]. Text, _ Self. S1 [I]. Value ));
Count ++;
}
}
For (var s = 0; S <count; s ++ ){
_ Self. s1.remove (_ Self. s1.selectedindex );
}
}
_ Self. t2.onclick = function (){
VaR COUNT = 0;
For (VAR I = 0; I <_ Self. s2.length; I ++ ){
If (_ Self. S2 [I]. Selected ){
_ Self. s1.options. Add (New Option (_ Self. S2 [I]. Text, _ Self. S2 [I]. Value ));
Count ++;
}
}
For (var s = 0; S <count; s ++ ){
_ Self. s2.remove (_ Self. s2.selectedindex );
}
}
}
}

// Call
VaR selement = {
Select1: Document. getelementbyid ("leftbox "),
Select2: Document. getelementbyid ("rightbox "),
Button1: Document. getelementbyid ("goright "),
Button2: Document. getelementbyid ("goleft ")
};
VaR M1 = new moveselect (selement );
M1.move ();
</SCRIPT>
</Body>
</Html>


Javascript ListBox move around
BeijingShanghaiGuangzhouShenzhen


ChengduShenzhenNanjingTianjin

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