How to concatenate messages to a message while using client.registerstartupscript in ASP.NET with C#?

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I want to concatenate messages to a message while using ClientScript.RegisterStartupScript in asp.net with c#. While concatenating, no message is coming while the same works on appending the same.

What I have tried:

MY Code is as below:

C#

// concatenating a message in <pre>ClientScript.RegisterStartupScript
string strTest += "\r\nInvalid OIC Type for Loans!";
ClientScript.RegisterStartupScript(typeof(Page), "MessagePopUp", "alert('Request saved successfully and send to Maker for verification" + "(Test - " + strTest + "); window.location.href = 'Test_Initiation.aspx" + queryString + "'; ", true);

// Without concatenating a message in ClientScript.RegisterStartupScript
ClientScript.RegisterStartupScript(typeof(Page), "MessagePopUp", "alert('Request saved successfully and send to Maker for verification'); window.location.href = 'DDS300_Initiation.aspx" + queryString + "'; ", true);

Posted 9-Mar-20 6:38am

ranio

Updated 9-Mar-20 10:37am

Richard Deeming

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phil.o · Answer 1 · 2020-03-09T08:34:00

There seems to be a syntax error in your alert call, plus an incorrect usage of double quotes in place of a single quote. Try

JavaScript

ClientScript.RegisterStartupScript(typeof(Page), "MessagePopUp", "alert('Request saved successfully and send to Maker for verification" + "(Test - " + strTest + ")'); window.location.href='/KB/answers/Test_Initiation.aspx" + queryString + "'; ", true);

instead.

Richard Deeming · Answer 2 · 2020-03-09T10:38:00

As well as the missing single quote, your message needs to be properly encoded. You are currently outputting:

JavaScript

alert('Request saved successfully and send to Maker for verification(Test - 
Invalid OIC Type for Loans!); window.location.href = 'Test_Initiation.aspx?...';

which won't work, because normal JavaScript strings can't contain unescaped line-breaks.

You should be outputting:

JavaScript

alert('Request saved successfully and send to Maker for verification(Test - \r\nInvalid OIC Type for Loans!'); window.location.href = 'Test_Initiation.aspx?...';

Use HttpUtility.JavaScriptStringEncode to encode your message before appending it. You should probably encode the queryString as well, just to be safe.

C#

ClientScript.RegisterStartupScript(typeof(Page), "MessagePopUp", "alert('Request saved successfully and send to Maker for verification" + "(Test - " + HttpUtility.JavaScriptStringEncode(strTest) + "'); window.location.href = 'Test_Initiation.aspx" + HttpUtility.JavaScriptStringEncode(queryString) + "'; ", true);

I think it would probably be cleaner to use string.Format, to build the script:

C#

ClientScript.RegisterStartupScript(typeof(Page), "MessagePopUp", string.Format("alert('Request saved successfully and send to Maker for verification(Test - {0}'); window.location.href = 'Test_Initiation.aspx{1}';", HttpUtility.JavaScriptStringEncode(strTest), HttpUtility.JavaScriptStringEncode(queryString)), true);

That should make it easier to spot any syntax errors in your script.

HttpUtility.JavaScriptStringEncode Method (System.Web) | Microsoft Docs[^]

How to concatenate messages to a message while using client.registerstartupscript in ASP.NET with C#?

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