RegisterStartupScript doesn't work with ScriptManager,Updatepanel. Why is that?

Question

protected void timer1_Tick(object sender, EventArgs e)     {         foreach (RepeaterItem item in rpChat.Items)         {             TextBox txt = item.FindControl("txtChatMessage") as TextBox;             if (txt != null)             {                 message[i] = txt.Text;                 i--;             }         }         lblStatusChat.Text = "";         RepeaterBind();         string javaScript = "<script language=JavaScript>\n" + "alert('Button1_Click client-side');\n" + "</script>";          Page.ClientScript.RegisterStartupScript(this.GetType(), "myKey", javaScript);     } 

timer_click trigggers and update panel. And the alert message doesnt show up on timer_tick event

Answer 1

When you use an UpdatePanel, then you can not call JavaScript using ClientScript as you have tried to. You have to use ScriptManager.RegisterStartupScript instead.

So change your

Page.ClientScript.RegisterStartupScript(this.GetType(), "myKey", javaScript); 

to

ScriptManager.RegisterStartupScript(updatePanelId,updatePanelId.GetType(), "alert", javaScript, true);