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POJavascript Alert from C# Class
 

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    <p>Here is my code where I register a script block to show a Javascript alert from my C# class:</p> <pre><code>public static void MessageBox(string strMessage) { // Gets the executing web page Page page = HttpContext.Current.CurrentHandler as Page; string script = string.Format("alert('{0}');", strMessage); // Only show the alert if it's not already added to the if (page != null &amp;&amp; !page.ClientScript.IsClientScriptBlockRegistered("alert")) { page.ClientScript.RegisterClientScriptBlock(page.GetType(), "alert", script, true /* addScriptTags */); } } </code></pre> <p>This works great when I call the <code>MessageBox</code> function <strong><em>before</em></strong> the DOM has been fully loaded. However, when I call this function dynamically (ex: if a user hit submit and an error was caught) <strong><em>after</em></strong> the DOM has been fully loaded, the alert does NOT pop up.</p> <p>Is there a reason why my initial call <strong><em>before</em></strong> the DOM is fully loaded works, while the same call made <strong><em>after</em></strong> the DOM was loaded does not work?</p> <p><em><strong>EDIT:</em></strong></p> <p>After checking out the link below in the comments, I gave it a shot:</p> <pre><code>Page page = HttpContext.Current.CurrentHandler as Page; ScriptManager.RegisterClientScriptBlock(page, typeof(Page), "MyScript", "alert('heyyyyyy');", true); </code></pre> <p>Although <code>ScriptManager</code> is supposed to be for handling AJAX calls, this produces the SAME result as my original attempt above. The Javascript alert pops up on the initial page load, but never pops again (on any of my AJAX requests).</p> <p><em><strong>EDIT (2):</em></strong></p> <p>Here is my <code>MessageBox</code> function:</p> <pre><code>public static void MessageBox(string strMessage) { Page page = HttpContext.Current.CurrentHandler as Page; ScriptManager.RegisterClientScriptBlock(page, typeof(Page), "MyScript", "alert('heyyyyyy');", true); } </code></pre> <p>Here is one place I call it:</p> <pre><code>public static string GetLoggedOnUserId(string strLogonUser) { string strUserId = string.Empty; try { MessageBox("hey"); int intPositionOfSlash = strLogonUser.IndexOf("\\"); strUserId = strLogonUser.Substring(intPositionOfSlash + 1, 6).ToUpper(); } catch (Exception ex) { ErrorHandler('B', ex); } strLoggedOnUser = strUserId; return strUserId; } </code></pre> <p>And this call will make the alert pop up (since it's on the first page load).</p> <p>Here is the second time I attempt to call the <code>MessageBox</code> function:</p> <pre><code>public static string LoadListItems(string strListItemStoredProcedureName, string strConnectionString) { try { string strSQLQuery = " EXE " + strListItemStoredProcedureName.Trim() + " "; SqlCommand objCommand = new SqlCommand(strSQLQuery, objConnection); // other code here... } catch (Exception ex) { MessageBox("error"); } } </code></pre> <p>This call does <strong><em>NOT</em></strong> pop up the alert... Keep in mind, this function is called via an AJAX post - NOT on a page reload.</p>
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    1. COWhat do you mean by the DOM is fully loaded? As far as I remember all client scripts go to one place in the HTML document and it does not matter when during the page life-cycle you add them (well almost :)). Are there any JavaScript errors?
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    2. COThere are no Javascript errors... And what I mean by "DOM is fully-loaded" is: once all HTML/Javascript has finished loading in my browser.
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    3. COI think I may have found a (or THE) [**reason**](http://www.codedigest.com/Articles/ASPNET/314_Multiple_Ways_to_Call_Javascript_Function_from_CodeBehind_in_ASPNet.aspx). Seems like `RegisterClientScriptBlock` only fires on startup and on subsequent page postbacks.
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