Skip to main content

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

By

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.

Do you like this article. Then comment here or share with your friends. Or like our facebook page.


Labels:

Comments

  1. rohitsri12:05 am, May 02, 2012

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

    ReplyDelete

Post a Comment

Popular posts from this blog

Code To Convert rupees(numbers) into words using C#.Net

By
Introduction: In my previous article I have explained about how to validate emailid using javascript . In this article I am going to explain about code used to convert rupees(numbers) into words using C#.Net . Explanation: For explanation purpose I have a page. It has a textbox to input the numbers. And when you click on the convert to words button then it will convert the input numbers into words and shows it in the below label. Below is the C# code used to do this functionality. public static string NumbersToWords( int inputNumber) {     int inputNo = inputNumber;     if (inputNo == 0)         return "Zero" ;     int [] numbers = new int [4];     int first = 0;     int u, h, t;     System.Text. StringBuilder sb = new System.Text. StringBuilder ();     if (inputNo < 0)     { ...
16 comments
Read More...

C# Extension Methods Example

By
In this article i am going to explain about Extension Methods  with example. Extension methods enable you to "add" methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type. Extension methods are a special kind of static method, but they are called as if they were instance methods on the extended type. For client code written in C# and Visual Basic, there is no apparent difference between calling an extension method and the methods that are actually defined in a type. If you do implement extension methods for a given type, remember the following points: An extension method will never be called if it has the same signature as a method defined in the type. Extension methods are brought into scope at the namespace level. For example, if you have multiple static classes that contain extension methods in a single namespace named Extensions, they will all be brought into scope by the using Extensions; directive. ...
Post a Comment
Read More...

VBScript equivalent string functions in C#.Net

By
C# Method VBScript Description IndexOf() InStr Returns the position of the first occurrence of one string within another. The search begins at the first character of the string - InStrRev Returns the position of the first occurrence of one string within another. The search begins at the last character of the string ToLower() LCase Converts a specified string to lowercase SubString() Left Returns a specified number of characters from the left side of a string Length() Len Returns the number of characters in a string TrimStart() LTrim Removes spaces on the left side of a string TrimEnd() RTrim Removes spaces on the right side of a string Trim() Trim Removes spaces on both the left and the right side of a string SubString() M...
Post a Comment
Read More...