Javascript alert not displayed

Question

1.00/5 (1 vote)

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This is the code-behind code

C#

ScriptManager.RegisterStartupScript(this, GetType(), "alertMessage",
    "alert("Test Message");", true);

But the alert message does not display.
But if coded like that, this message displays on the top of the page

C#

ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "Notify", "alert('Notification : Your Message.');", true);

Wish you can hint me why. For the 2nd one I revised and tried, but it does not work

C#

string s = "Notification : Your Message.";
ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "Notify", "alert(" + s + ");", true);

Could you provide your advisory? Thanks.

What I have tried:

JavaScript alert not displayed

Posted 13-Jul-16 7:33am

s yu

Updated 13-Jul-16 7:53am

v2

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2 solutions

Solution 1

The difference is the places where it gets rendered. Otherwise, there is no difference. Refer - RegisterStartupScript vs RegisterClientScriptBlock in asp.net - dotnetprof[^].

You have not used the second one correctly. Try like below.

C#

ClientScript.RegisterClientScriptBlock(this.GetType(), "sample", "alert('Test Message')", true);

Posted 13-Jul-16 7:47am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

s yu 13-Jul-16 13:53pm

TS: Thanks for your response. I revised my Q, and added 3nd one. Could you provide your hint for it? My 2nd one is essentially the same as yours and it works fine. Thanks.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 13-Jul-16 14:03pm

So, now it is working right?

Karthik_Mahalingam 13-Jul-16 14:19pm

obviously your code works.
my 5! for you, since both our solution are same. and mine only marked as answer.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 14-Jul-16 5:33am

Hehe. Thanks man. :)

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Karthik_Mahalingam · Accepted Answer · 2016-07-13T07:53:00

Solution 2

try

C#

// this 
 ScriptManager.RegisterStartupScript(this, GetType(), "alertMessage",  "alert('Test Message');", true);
// or  (when using update panel)
 ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alert", "alert('my message');", true);

use single quotes for alert message string

C#

string s = "Notification : Your Message.";
ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "Notify", "alert('" + s + "');", true);

Posted 13-Jul-16 7:53am

Karthik_Mahalingam

Updated 13-Jul-16 7:56am

v3

Comments

s yu 13-Jul-16 13:59pm

Yours works fine. However, how can a variable is included? I tried:
string s = "xxxxxxxxxxxx");
ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alert", "alert(" + s + ");", true);
then it does not work.

Karthik_Mahalingam 13-Jul-16 14:00pm

add single quotes to the variable or in the alert
ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alert", "alert('" + s + "');", true);

s yu 13-Jul-16 14:03pm

Actually I also tried to have a single quote for the string like yours. But it does not work.

Karthik_Mahalingam 13-Jul-16 14:04pm

show your code

s yu 13-Jul-16 14:08pm

string s = "xxxxxx";
ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('" + s + "');", true);

Karthik_Mahalingam 13-Jul-16 14:09pm

i have tested this code, it works fine..

are you calling this code on button click?

s yu 13-Jul-16 14:11pm

Sorry, your works. The problem is that in my original, the s is TOO long. In my original the s is the result of the browser info, too long. I guess the alert has a limit on the message.

Karthik_Mahalingam 13-Jul-16 14:12pm

ok fine..
cool.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 14-Jul-16 5:33am

+5.

Karthik_Mahalingam 14-Jul-16 6:56am

Thank you TD :)