All about Javascript from server side

These are just my notes on Javascript:

• When AJAX is involved, use ScriptManager.RegisterStartupScript, instead of Page.ClientScript.RegisterStartupScript.
• The specialty of RegisterStartupScript (compared to RegisterClientScriptBlock) is that it places the code at the very end of the page (before the </form> tag.
• To check if we have already inserted a block of Javascript:
  if (!Page.ClientScript.IsStartupScriptRegistered(“myCode”))
  {
  Page.ClientScript.RegisterStartupScript(this.GetType(),
  “myCode”, script);
  }
• Add a js include file:
  Page.ClientScript.RegisterClientScriptInclude(“myscript”, ResolveUrl(“ScriptsMyScript.js”))
• Insert client-side form validation:
  form1.Attributes.Add(“onsubmit”, “return checkBeforeSubmit();”);
  You can also do onClientClick=”return checkBeforeSubmit();” Returning false will cancel the submission. A very basic one:
  <asp:Button ID=”btnDelete” runat=”server” Text=”Delete” OnClientClick=”return confirm(‘Are you sure?’);”/>