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Dynamically add and delete options for select using js

Source: Internet
Author: User
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<Select id = "ddlResourceType" onchange = "getvalue (this)">

</Select>

Dynamically delete all options in the select statement:

Document. getElementById ("ddlResourceType"). options. length = 0;

Dynamically delete an option in the select statement:

Document. getElementById ("ddlResourceType"). options. remove (indx );

Dynamically Add the option in the select statement:

Document. getElementById ("ddlResourceType"). options. add (new Option (text, value ));

Both IE and FireFox can be tested successfully. I hope you can use it later.

You can also use standard DOM operations, such as document. createElement, appendChild, and removeChild.

Value

Function getvalue (obj)

{

Var m = obj. options [obj. selectedIndex]. value

Alert (m); // obtain the value

Var n = obj. options [obj. selectedIndex]. text

Alert (n); // get text

}

========================================================== ==============================================

1. Check whether selected

If (objSelect. selectedIndex>-1 ){

// Indicates the selected

} Else {

// The description is not selected.

}

2. Delete selected items

ObjSelect. options [objSelect. selectedIndex] = null;

3. Add items

ObjSelect. options [objSelect. length] = new Option ("hello", "hello ");

4. Modify the selected items

ObjSelect. options [objSelect. selectedIndex] = new Option ("hello", "hello ");

5. Obtain the text of the selected item.

ObjSelect. options [objSelect. selectedIndex]. text;

6. Obtain the value of the selected item.

ObjSelect. options [objSelect. selectedIndex]. value;

========================================================== ====================================

<% @ LANGUAGE = "VBSCRIPT" CODEPAGE = "936" %>

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

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

<Head>

<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312"/>

<Title> dynamically add options to select using JavaScript [IE and FireFox compatible] </title>

<Script language = "javascript" type = "text/javascript">

Function xlbchange (s ){

Switch (s ){

Case "1 ":

Document. getElementById ("lb"). options. length = 0;

Var soojs_value = [0, 1, 2, 3];

Var soojs_text = ["Spirit extraction", "Style Design", "goal setting", "concept improvement"];

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

Var oOption = document. createElement ("OPTION ");

OOption. value = soojs_value [I];

OOption. text = soojs_text [I];

Zpmange. lb. options. add (oOption );

}

Break;

Case "2 ":

Document. getElementById ("lb"). options. length = 0;

Var soojs_value = [0, 1, 2, 3, 4, 5, 6, 7];

Var soojs_text = ["school logo", "school motto", "school song", "school name font", "school history exhibition room", "brochure", "promotional disc ", "office supplies souvenir"];

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

Var oOption = document. createElement ("OPTION ");

OOption. value = soojs_value [I];

OOption. text = soojs_text [I];

Zpmange. lb. options. add (oOption );

}

Break;

Case "3 ":

Document. getElementById ("lb"). options. length = 0;

Var soojs_value = [0, 1, 2, 3];

Var soojs_text = ["Campus Landscape Design", "campus sculpture design", "campus embossed design", "corridor culture design"];

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

Var oOption = document. createElement ("OPTION ");

OOption. value = soojs_value [I];

OOption. text = soojs_text [I];

Zpmange. lb. options. add (oOption );

}

Break;

Case "4 ":

Document. getElementById ("lb"). options. length = 0;

Var soojs_value = [0, 1, 2];

Var soojs_text = ["School System", "cultural activities", "behavioral norms"];

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

Var oOption = document. createElement ("OPTION ");

OOption. value = soojs_value [I];

OOption. text = soojs_text [I];

Zpmange. lb. options. add (oOption );

}

Break;

Default:

Document. getElementById ("lb"). options. length = 0;

Var oOption = document. createElement ("OPTION ");

OOption. value = 0;

OOption. text = "select file category ";

Zpmange. lb. options. add (oOption );

}

}

</Script>

</Head>

<Body>

<Form action = "zpmange. asp" name = "zpmange" method = "post">

<P> <select id = "ddlResourceType" onchange = "getvalue (this)"> <br/>

</Select> </p>

<P> dynamically delete all options in the select statement: <br/>

Document. getElementById ("ddlResourceType"). options. length = 0; <br/>

<Br/>

Dynamically delete an option in the select statement: <br/>

Document. getElementById ("ddlResourceType"). options. remove (indx); </p>

<P> dynamically Add the option in the select statement: <br/>

Document. getElementById ("ddlResourceType"). options. add (new Option (text, value); </p>

<P> both IE and FireFox can be tested successfully. I hope you can use it later. <Br/>

You can also use standard DOM operations, such as document. createElement, appendChild, and removeChild. </P>

<P> value <br/>

Function getvalue (obj) <br/>

{<Br/>

Var m = obj. options [obj. selectedIndex]. value <br/>

Alert (m); // obtain value <br/>

Var n = obj. options [obj. selectedIndex]. text <br/>

Alert (n); // obtain text <br/>

} <Br/>

</P>

<P> example: </p>

<Table width = "80%" border = "0" align = "center" cellpadding = "1" cellspacing = "1" style = "border-style: double">

<Tr>

<Td width = "50%" height = "41"> <div align = "center">

<Select name = "xt" id = "xt" onchange = "xlbchange (this. value)">

<Option selected = "selected"> select the file system </option>

<Option value = "1"> concept view system </option>

<Option value = "2"> visual recognition system </option>

<Option value = "3"> environment view system </option>

<Option value = "4"> behavior-based system </option>

</Select>

</Div> </td>

& Lt; td width = "61%" & gt; <div align = "center" & gt;

<Select name = "lb" id = "lb">

<Option selected = "selected"> select a Category </option>

</Select>

</Div> </td>

</Tr>

<Tr>

<Td height = "203" colspan = "2"> </td>

</Tr>

</Table>

</Form>

</Body>

</Html>

 

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