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How to implement cascading menus using JavaScript

Source: Internet
Author: User
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How to implement cascading menus using JavaScript

This example describes how to implement cascading menus in JavaScript. Share it with you for your reference. The specific implementation method is as follows:

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<Html>

<Head>

<Title> test </title>

<Script type = "text/javascript">

Function f ()

{

Var sel = document. getElementById ("country ");

Var sel2 = document. getElementById ("city ");

Var cnarr1 = new Array ("bj", "sh ")

Var cnarr2 = new Array ("beijing", "shanghai ")

Var usaarr1 = new Array ("dc", "ny ")

Var usaarr2 = new Array ("Washington", "NewYork ")

For (var I = sel2.length; I> = 0; I --){

Sel2.removeChild (sel2.childNodes [I]);

}

Var op = document. createElement ("option ");

Op. value = "please ";

Op. text = "please ";

Sel2.appendChild (op );

If (sel. value = 'USA '){

For (I = 0; I <2; I ++ ){

Op. value = us10000r1 [I];

Op. text = us%r2 [I];

Sel2.appendChild (op );

}

}

Else if (sel. value = 'cn '){

For (I = 0; I <2; I ++ ){

Op. value = cnarr1 [I];

Op. text = cnarr2 [I];

Sel2.appendChild (op );

}

}

}

</Script>

</Head>

<Body>

<Select onchange = "f ()" id = 'country'>

<Option> please </option>

<Option value = 'usa'> America </option>

<Option value = 'cn'> China </option>

</Select>

<Select id = 'city'>

<Option> please </option>

</Select>

</Body>

</Html>

I hope this article will help you design javascript programs.

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