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Preselect html select/drop down value based on text in asp.net

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Introduction:

In this article I am going to explain about how to preselect asp drop down or html select value based on a text.

Description:

In some cases we are in the situation to preselect the drop down or html select option based on some text. Here I am explaining this process using javascript code. For the explanation purpose I have a form. In that form I have a html select with id “select_cities”. This select have three options and each option have some values. In this scenario I am supposed to select the option with the text “Kanna”. For this I have written a javascript function “test”.Below is the code used.


Code:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>

<!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 runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <select id="C">
            <option value="0">select name</option>
            <option value="1">kanna</option>
            <option value="2">dasan</option>
        </select>
    </div>
    <script type="text/javascript">
        window.onload = test;
        var name = "kanna";
        function test() {
            for (var i = 0; i < document.getElementById("select_cities").length; i++) {
                if (document.getElementById("select_cities").options[i].text == name) {
                    var a = document.getElementById("select_cities").options[i].value;
                    document.getElementById("select_cities").value = a;
                }
            }
        }      
    </script>
    </form>
</body>
</html>

In the above code the javascript function through the for loop first gets the option value of that particular  text. After that set the options value to that value.

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Comments

  1. rohitsri12:05 am, May 02, 2012

    its really helpfull for all...please post some new techniques vry soon...
    thanks alot sir..

    ReplyDelete

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