How to write the code for calling the scripts

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Hi,

I am writing the javascript in Code behind as follows:

MIDL

string script = "<script language=" + Strings.Chr(34) + "javascript" + Strings.Chr(34) + ">" + "  alert(" + Strings.Chr(34) + msg + Strings.Chr(34) + ");" + "</script>";
       ClientScript.RegisterStartupScript(this.GetType(), "Message", script);

It showing error in the strings.chr. Canany one tell me what is the correct code.

Thanks in advance

Posted 10-Jul-11 21:00pm

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thatraja 11-Jul-11 3:05am

what's the error message?

2 solutions

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-07-10T21:16:00

Who told you there is Strings and Strings.Chr? It's probably from your previous re-incarnation.

Do you mean just a character with Unicode code point 34? This is just a quotation mark!

Use:

C#

string script = @"<script language=""javascript""> and so on...";

The symbol "@" means verbose syntax for string literal; in this syntax, quotation mark is escaped by doubling it. In regular syntax, it is escaped as \".

A character from numeric literal meaning its code point can be obtained as (char)34. You don't need it here.

Why not simply referring to C# reference instead of your trial-and-error? So counter-productive!

Also, avoid multiple concatenation of strings (+). Is is very ineffective because string is immutable. (Do I have to explain why?) If you concatenate just constants, it would not matter, because it's done in compile time, but if you used function in between, it would be during run-time.

Use string.Format instead. If concatenated members are statically unknown, use System.Text.StringBuilder.

Avoid any immediate constants, especially strings. Use explicit constants, resources, data files, etc.

—SA

Prerak Patel · Accepted Answer · 2011-07-10T21:07:00

Solution 1

Use it like this

string script = "<script language='javascript'> alert('" + msg + "');</script>";<br />
ClientScript.RegisterStartupScript(this.GetType(), "Message", script);

Posted 10-Jul-11 21:07pm

Prerak Patel

Updated 10-Jul-11 21:25pm

v5

Comments

Sergey Alexandrovich Kryukov 11-Jul-11 3:18am

Sorry, this is incorrect. You're using non-escaped " in string literal -- it won't compile. Also you're using multiple '+'. My 1 this time, sorry.
--SA

Prerak Patel 11-Jul-11 3:20am

Ah, my bad. Actually I forgot to change it to single quotes.

Sergey Alexandrovich Kryukov 11-Jul-11 3:21am

I actually did not vote yet -- please fix it.
Please see my answer.
--SA

Prerak Patel 11-Jul-11 3:26am

Seems like a bug in pre tag. If I write 'javascript', it displays "'javascript'" (enclosed in double quotes). Used code tag instead.