How to show alert box without postback?

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I want to show error message in alert box.but it gets postback while showing it.Can any one help to show alert without postback?

Posted 21-Jun-10 18:49pm

Maran135

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thatraja · Answer 1 · 2010-06-21T19:02:00

<a href="#" onclick="javascript:alert('hi');">Click</a>

if you use AJAX in your page you can call this code on required places

ScriptManager.RegisterClientScriptBlock(this, typeof(Page), "test", "alert('welcome');");

on page load,

Page.ClientScript.RegisterStartupScript(typeof(Page), "MyScript", "alert('welcome');");

**PSK_** · Answer 2 · 2010-06-21T19:46:00

In case of alert you should return false to the control. If you'll not return any thing it will be considered as true and postback will happen.

Your code should look something like this.

Javascript Code:

<script language="javascript">
        function Check() {
            //If validation failed       
            alert("Check all validation");
            return false;
            
            //If validation passed in that case return true.
        }
    </script>

Markup Code:

<asp:Button ID="btnTest" runat="server" Text="Post Back Test" OnClientClick="return Check();" />

How to show alert box without postback?

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