Execute JavaScript code in the code-behind and update a panel

I currently have the following code within the OnClick event of a Button:

if (true) {
  ClientScript.RegisterStartupScript(UpdatePanel1.GetType(), "", "show_modal('true');", true);
} else {
  ClientScript.RegisterStartupScript(UpdatePanel1.GetType(), "", "show_modal();", true);
}

Furthermore, I have designated the Button as a trigger for an UpdatePanel:

<Triggers>
  <asp:AsyncPostBackTrigger ControlID="btnEdit" EventName="Click" />
</Triggers>

The function show_modal is housed within a separate .js file that is linked to the ASP page.

Any suggestions on how to ensure this script operates correctly?

javascriptasp.netc#-4.0

Answer №1

Avoid using 

ClientScript.RegisterStartupScript
and opt for 
ScriptManager1.RegisterStartupScript
in its place. Ensure that "ScriptManager1" corresponds to the designated name of your ScriptManager control.

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