Alert msg in asp.net using c#

Question

1.00/5 (1 vote)

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Response.Write("<script language=javascript> alert('"gk_szEnter_Value_Error_Message"'); </script>");

its not displaying the required error msg..its throwing error..pls help

Posted 26-Feb-15 11:21am

Member 11483453

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2 solutions

Solution 1

If does work, even if it is not a valid HTML. :-)
But of course, it shows "gk_szEnter_Value_Error_Message" (which double quotation marks), not the value of the variable. If you expected that, it would be quite weird.

Maybe what you miss is this:
http://support.microsoft.com/kb/307860[^],
https://msdn.microsoft.com/en-us/library/bda9bbfx%28v=vs.100%29.aspx[^],
http://weblogs.asp.net/ahmedmoosa/embedded-code-and-inline-server-tags[^].

—SA

Posted 26-Feb-15 12:06pm

Sergey Alexandrovich Kryukov

Comments

Afzaal Ahmad Zeeshan 26-Feb-15 18:13pm

The behaviour you're talking about comes if the strings are prepended with a @ sign to ignore the " occurance. The OP encountered the error just because he has not closed the strings. At this moment, OP has not yet came all the way down to the browser to ignore the HTML markup problems and let browser do all of its magic. At this moment, any syntax error would cause a yellow-screen of death for him; a parser error.

OP needs to concatenate the strings in the Response.Write() methods, so that the variable data must be written inside the alert box. See my solution 2.

Sergey Alexandrovich Kryukov 26-Feb-15 18:37pm

I did not notice the unbalanced part, just up-voted your solution.
—SA

Member 11483453 26-Feb-15 18:25pm

Thanks for the solution:)

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Afzaal Ahmad Zeeshan · Accepted Answer · 2015-02-26T12:10:00

That is because your code and strings are not properly closed (the double quotes) in your code and the format and syntax of the code is broken there. Change your code to be like this one,

C#

Response.Write(@"<script> 
                      alert('" + gk_szEnter_Value_Error_Message + "'); 
                 </script>");

Now the code would execute, and would stream down the script. The gk_szEnter_Value_Error_Message will now be considered as a variable in your code and will be given the value it has at that moment.

A good way of writing strings is to use the String.Format()[^] function, to create the strings in an efficient way, for avoiding the concatenation; which causes a lot of trouble like it did for you in this scenario.

C#

Response.Write(String.Format("<script>alert('{0}');</script>"),    
                              gk_szEnter_Value_Error_Message);

This would now be an efficient way of avoiding the concatenation problems.

A personal tip, do not specify the language of your script. Browsers know it is JavaScript; unless you're using some other scripting language. I never do write it, and Browser doesn't complain at all. :)