How to call javascript function on keyup event for asp:TextBox

javascript asp.net events client-side

35,800

Solution 1

Test this solution:

Add this code to your page load:

txt_userid.Attributes.Add("onkeyup", "GetRes();");

I don't say this is best way possible, but it works.

UPDATE:

Complete sample:

ASPX:

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:TextBox ID="txt_userid" runat="server"></asp:TextBox>
    </div>
    </form>
</body>
</html>

Code behind:

protected void Page_Load(object sender, EventArgs e)
        {
            txt_userid.Attributes.Add("onkeyup", "alert('hi');");
        }

Works perfectly. Tested it in IE, Chrome, FireFox.

Solution 2

it is very simple:

TextBox1.Attributes.Add("onclick", "hello();");

in asp.cs code file.

then in aspx source file use javascript function:

<script type="text/javascript">
    function hello() {

    alert("hi")

    }

</script>

35,800

Author by

jams

Updated on November 23, 2020

Comments

jams over 3 years
How to call javascript function on keyup event for asp.net's TextBox control? I am trying something like this, but it is not working.
```
<asp:TextBox ID="txt_userid" runat="server"  onkeyup="GetRes();"></asp:TextBox>
```
UPDATE
there is a update alert is working but breakpoints in java function is not working.
Ranhiru Jude Cooray about 13 years

onkeyup is the event that is used to handle it. Why do you say it is not working? Have you tried showing an alert ?
jams about 13 years

@Ranhiru Cooray: there is a update alert is working but breakpoints in java function is not working.
Ranhiru Jude Cooray about 13 years

Do you want to handle the onkeyup event, client side using JavaScript OR in the server side using C#/VB.NET code? I know that you have specified client-side as a tag, but what break point do you expect in JavaScript to work?
Afshin Gh about 13 years

@jams: Updated my post. check it out. The sample I included works.