How to run a popup window from code behind in web Part writen in C#

Question

I must run a popup worning when somebady exceeded a something walues. I try a Sharepoint Modal and javascript, but I don't know how to run something from behind code to run javaScript, or Sharepoint Modal window. I write a 3 ASPX elements:

<a title="Open Dialog" href="javascript:ShowWelcomeDialog();" id="ErrorPopup" runat="server">Open Dialog</a><br /> <asp:HyperLink ID="HyperLink1" NavigateUrl="javascript:ShowWelcomeDialog();" runat="server">HyperLink</asp:HyperLink><br /> <asp:LinkButton ID="LinkButton1" runat="server">LinkButton</asp:LinkButton>

How to run from Code Behind a Hiperlink, or a LinkButton or how to add a javascript to the Button_Click Please help.

Answer 1

In the code behind the code may look like this:

   var url = SPContext.Current.Web.Url + "/_layouts/myPage.aspx;
   ScriptManager.RegisterStartupScript(this.Page, typeof(Page),
   "CustomScript", "OpenDialog('" + url + "', 994, 1000, 'Title of the script', null);", true);

And the Javascript code will be like this:

    function OpenDialog(strPageURL, width, height, title, args) {

            var dialogOptions = SP.UI.$create_DialogOptions();
            dialogOptions.url = strPageURL; // URL of the Page
            dialogOptions.width = width; // Width of the Dialog
            dialogOptions.height = height; // Height of the Dialog
            dialogOptions.title = title;
            dialogOptions.args = args;
            dialogOptions.allowMaximize = false;
            dialogOptions.dialogReturnValueCallback = Function.createDelegate(null, CloseCallback); // Function to capture dialog closed event
            SP.UI.ModalDialog.showModalDialog(dialogOptions); // Open the Dialog
            return false;
        }

      // Dialog close event capture function
        function CloseCallback(strReturnValue, target) {

            if (strReturnValue === SP.UI.DialogResult.OK) // Perform action on Ok.
            {
                 //alert("User clicked Ok!");
            }
            if (strReturnValue === SP.UI.DialogResult.cancel) // Perform action on Cancel.
            {
                //alert("User clicked Cancel!");
            }
        }