Unable to get value through javascript in asp.net

Question

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When I click on button just page refresh and I didn't get textbox value.

C#

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="test.aspx.cs" Inherits="TestToOnFocus.test" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <script src="test.js"></script>
    <title>Test</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="txtName" runat="server" ClientIDMode="Static"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" Text="Button"  OnClientClick="return test();"/>
    </div>
    </form>
</body>
</html>

JavaScript

function test() {

    var name = document.getElementById("<%= txtName.ClientID %>").value;
    if(name=="")
    {
        alert("Please");
    }
    else
    {
        alert(name);
    }
}

Posted 20-Nov-15 0:32am

MS Rumi

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Comments

hypermellow 20-Nov-15 6:46am

Your JavaScript function needs to return a value of false to prevent the postback.
.. add "return false;" as the last line of your function, and see how it behaves then.

MS Rumi 20-Nov-15 7:06am

not working

hypermellow 20-Nov-15 7:25am

Then I would start by checking that your test.js file is included correctly.
... you could also try removing the included js file, and adding the test() function to the document head (within script blocks).

3 solutions

Solution 1

Try this-

JavaScript

function test() {
 
    var name = document.getElementById("<%= txtName.ClientID %>").value;
    if(name=="")
    {
        alert("Please");
        return false;
    }
    else
    {
        alert(name);
        return true;
    }
}

Posted 20-Nov-15 1:03am

Suvendu Shekhar Giri

Comments

MS Rumi 20-Nov-15 7:08am

no dear its not working .. just page refreshed no text value comes.

Solution 3

try

document.getElementById("<%= txtName.ClientID %>").val();

instead of

document.getElementById("<%= txtName.ClientID %>").value;

Posted 20-Nov-15 1:30am

Anupam Singh_

Comments

MS Rumi 20-Nov-15 8:21am

Tried both of them but still page refreshed and no value comes out.

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Arasappan · Accepted Answer · 2015-11-20T01:05:00

Solution 2

HTML

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

function validate()
{
if(document .getElementById("<%=txtName.ClientID%>").value=="Select")
{

alert ("Please ");
document.getElementById("<%=txtName.ClientID%>").focus();
return false ;

}

}

</script>

http://www.aspsnippets.com/Articles/TextBox-Validation-using-JavaScript.aspx[^]

Download Js file and drag it to ur project

Posted 20-Nov-15 1:05am

Arasappan

Updated 20-Nov-15 1:23am

v4

Comments

MS Rumi 20-Nov-15 7:12am

just page refreshed

Arasappan 20-Nov-15 7:16am

Answer Updated

MS Rumi 20-Nov-15 8:20am

I just want to get the value in the textbox. But I am not getting. :(

Arasappan 20-Nov-15 8:21am

what you getting