I am back in .net after a long break.. i am stuck with a problem ..
I have coded to display a message box using "System.Windows .Forms.MessageB ox.Show " to show up based on condition and this works fine in my local machine but when i publish the site and put the .dll out for testing i am getting an error saying
---------------------------
Microsoft Internet Explorer
---------------------------
Sys.WebForms.Pa geRequestManage rServerErrorExc eption: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500
---------------------------
OK
---------------------------
19  7612  Plater 7,872
Recognized Expert Expert
You really shouldn't be using windows.forms namespace in a web application.
Besides, it would only popup a messagebox on the server, not on the client.
That's what javascript's Alert() is for
Thanks for your reply. I have tried using Alert but got an Parser error message, can you please gv me any examples if you have.
Plater 7,872
Recognized Expert Expert
Ok.
Simple javescript: -
<script type="text/javascript">
-
alert('hi!');
-
</script>
-
In ASP.NET: -
string namestr="Plater";
-
MyClickableControl.Attributes.Add("onclick", "Alert('Howdy there '"+namestr+");");
-
Thanks for your reply.. I am still getting below error
code snap:
Response.Write( "<script type='text/javascript'> alert('Cant Save Data Again After Submit'); </script>");
Error:
---------------------------
Microsoft Internet Explorer
---------------------------
Sys.WebForms.Pa geRequestManage rParserErrorExc eption: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write( ), response filters, HttpModules, or server trace is enabled.
Details: Error parsing near '<script type='text/j'.
---------------------------
OK
---------------------------
 Frinavale 9,735
Recognized Expert Moderator Expert How to use JavaScript in ASP.NET
Do not use Response.Write( )
Why?
It breaks parses ;)
Basically it's going to output to "somewhere" in the response. This is typically in an invalid place.
For example if you use Response.Write( "<script type='text/javascript'> alert('Cant Save Data Again After Submit'); </script>") it's likely that the HTML generated looks something like: - <script type='text/javascript'> alert('Cant Save Data Again After Submit'); </script>
-
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-
4<html xmlns="http://www.w3.org/1999/xhtml">
-
-
....
Notice how the output is before the doctype and the HTML tag?
Well this is invalid and IE8 has a perfectly good reason to be complaining.
You can use Response.Write in your ASP code for the page.
that way it is the Response.Write( ) is called in a Valid place in the HTML.
For example in your ASPX code you could have something like: -
<%@ Page Language="C#" .... %>
-
-
<!-- your asp.net controls here -->
-
-
<script type="text/javascript">
-
alert('<%Response.Write("Cannot Save blah blah"); %>');
-
</script>
-
If you really want to generate your JavaScript server side then you should be registering it with your Page using the Page.ClientScri pt.RegisterStar tupScript method or if you're page is Ajax enabled, using the ScriptManager.R egisterClientSc riptBlock Method.
-Frinny
now i have below code but still it does not work but i dont get any error also.. corrections please -
string test = "<script language='javascript'>alert('Cant Save Data Again After Submit');</script>";
-
ClientScript.RegisterStartupScript(this.GetType(), "alert", "<script>alert('" + test + "');</script>");
Plater 7,872
Recognized Expert Expert
You are mixing example codes. Take a look at what I put and take a loot at what Frinavale put. You are mixing them up
Frinavale 9,735
Recognized Expert Moderator Expert
PPrasanna, what you posted doesn't make any sense.
You have a string "test" which contains: -
<script language='javascript'>
-
alert('Cant Save Data Again After Submit');
-
<script>
Then, when you're registering the script with the page, you are adding an additional <script> tag and adding an alert with the test inside it...
So your resulting JavaScript is going to look like: -
<script>
-
alert('<script language='javascript'>
-
alert('Cant Save Data Again After Submit');
-
<script>');
-
</script>
This doesn't make any sense...and it won't work because the string within the outter alert is being cut off by the apostrophe (') that is part of the inner script tag ...which is obviously causing JavaScript problems.
Try: -
string test = "<script language='javascript'>alert('Cant Save Data Again After Submit');</script>";
-
ClientScript.RegisterStartupScript(this.GetType(), "alert", test);
-
-Frinny
Hi Frinny,
Sorry that was my mistake to post wrong code i had the same code as you have told above but still its not working even though i dont get any error message. But also required message box do not pop out..
string test = "<script language='javas cript'>alert('C ant resubmit');</script>";
ClientScript.Re gisterStartupSc ript(this.GetTy pe(),"alert",te st);
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