return javascript value from asp.net button

[Guest]

Hi there,
Is there a way to call a javascript function and return its value, from
inside an asp.net button ??

 

[Guest]

In your Page_Load event you can add a line such as the following:

[C#]
button.Attributes["onclick"] = "alert(myFunc());";
or
button.Attributes.Add("onclick", "alert(MyFunc());");

This will manipulate the HTML output to include the client side event handler.

HTH

 

[Guest]

thanks for the reply...
I'm trying to get the user's time (hours and minutes).. and my code is in
the page load, not a button (sorry),... how can i call this function , not to
show it in a messagebox, but to just store it... like:
dim x as string = javafunction()
i have 2 seperate function , 1 for hour and 1 for minute...

In your Page_Load event you can add a line such as the following:

[C#]
button.Attributes["onclick"] = "alert(myFunc());";
or
button.Attributes.Add("onclick", "alert(MyFunc());");

This will manipulate the HTML output to include the client side event handler.

HTH
----
Dave Fancher
http://davefancher.blogspot.com

Hi there,
Is there a way to call a javascript function and return its value, from
inside an asp.net button ??

 

[Dave Fancher]

What you want to do is not directly possible. You'll have to develop a
"proxy" page or something that executes the client side java script to
retrieve the values that you want and stores the results in a hidden field
and automatically posts (see form.submit()) the form back to the server
which, in turn stores the values of the hidden fields in (most likely) a
session object then redirects the user to the page with which s/he will
interact.

If you are trying to just place a timestamp when the user posts the form,
you wouldn't need a proxy page, you could just add a client side submit
event handler that executes the code you want and saves it in a hidden
field. Never underestimate the power of DHTML.

--
Dave Fancher
http://davefancher.blogspot.com

thanks for the reply...
I'm trying to get the user's time (hours and minutes).. and my code is in
the page load, not a button (sorry),... how can i call this function , not
to
show it in a messagebox, but to just store it... like:
dim x as string = javafunction()
i have 2 seperate function , 1 for hour and 1 for minute...

In your Page_Load event you can add a line such as the following:

[C#]
button.Attributes["onclick"] = "alert(myFunc());";
or
button.Attributes.Add("onclick", "alert(MyFunc());");

This will manipulate the HTML output to include the client side event
handler.

HTH
----
Dave Fancher
http://davefancher.blogspot.com

Hi there,
Is there a way to call a javascript function and return its value, from
inside an asp.net button ??

 

[David Jessee]

Add a hiden field with the runat=server attribute.

the script would do something like:
document.forms[0].hiddenFieldElement.value='Hello World";
document.forms[0].submit();

now the problem you are going to have is that you can't really respond to an
event for this...so in your page load you'll have to have....

(VB.NET)
If hiddenFieldElement.value<>String.Empty then
''...do whatever you need to and then set the hidden field value to
String.Empty
hiddenFieldElement.value=String.Empty
End if

(C#)
if(hiddenFieldElement.value!=string.Empty){
//Process Evenything
hiddenFieldElement.value=string.Empty
}