How to display the alter message on the current page when I click on the button not on the blank page

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I need to show alert message on the page where I click on the button not on the blank page

please help

What I have tried:

C#

string alertMessage = "<script language=\"javascript\" type=\"text/javascript\">";

alertMessage += "alert('No quiz avalible');";
alertMessage += "window.location.href=\"";
alertMessage += "View.aspx?Id=" + Request.QueryString["Id"].ToString();
alertMessage += "\";";
alertMessage += "</script>";

ClientScript.RegisterClientScriptBlock(GetType(), "alertMessage ", alertMessage)

Posted 3-Aug-16 3:41am

Member 12618369

Updated 3-Aug-16 5:04am

Vincent Maverick Durano

v2

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Karthik_Mahalingam 3-Aug-16 9:47am

what is the error?
you code works fine.

Member 12618369 3-Aug-16 9:59am

The error is alter message is displayed on blank page

Richard Deeming 3-Aug-16 10:02am

Then add some content to the page!

Karthik_Mahalingam 3-Aug-16 10:04am

check my solution.

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Karthik_Mahalingam · Answer 1 · 2016-08-03T04:04:00

The Javascript code block executes before the DOM[^](page) is loaded, thats why the page is blank.
Just add jquery[^] reference to the page and modify the code as below. it should work.

C#

protected void Button1_Click(object sender, EventArgs e)
      {

          string alertMessage = "<script language=\"javascript\" type=\"text/javascript\">";
          alertMessage += "   $(function () { ";
          alertMessage += "alert('No quiz avalible');";
          alertMessage += "window.location.href=\"";
          alertMessage += "View.aspx?Id=" + Request.QueryString["Id"];
          alertMessage += "\"; });";
          alertMessage += "</script>";
          ClientScript.RegisterClientScriptBlock(GetType(), "alertMessage ", alertMessage);
      }

jquery reference

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>

refer this: jquery dom ready event[^]