How do I pass data back to my code behind events w/o postback?

[Mike]

I have an ASP.NET webform that has an HTML button (with an onClick
event that calls a javascript function) and a Web Forms button (the
code behind click event saves data back to a SQL DB).

The javascript function basically creates a variable such as:

var someStrings = "foo1.jpg,foo2. jpg,foo3.jpg,fo o4.jpg"

I really need to be able to access this javascript variable from the
Click event of my Web Forms button so that I can pull the file names
out of this string and do some database work on them.

Any ideas? I've thought of putting a web forms textbox on the form
and having my javascript function place the string contents in there
which is easily accessible by my web forms button click event, however
now I have an unsightly textbox that should not be on my form.

Is there an easier way to access the contents of a javascript
(client-side) variable from the click event of my web forms button?

Thanks!

[Andrew Thompson]

Re: How do I pass data back to my code behind events w/o postback?

On 13 Nov 2004 12:47:07 -0800, Mike wrote:
[color=blue]
> ...I've thought of putting a web forms textbox on the form
> and having my javascript function place the string contents in there
> which is easily accessible by my web forms button click event, however
> now I have an unsightly textbox that should not be on my form.[/color]

Include the data in a hidden form field or use CSS to hide the
textfield. The former is more reliable since it will work for
people who need to apply a user stylesheet.

HTH

--
Andrew Thompson
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[Scott Orsburn]

Re: How do I pass data back to my code behind events w/o postback?

I am not an ASP programmer but have had a similar need using other
technologies.

Unless I am failing to understand what you want to do you could also
have ASP create the JavaScript variable for you. You could certainly
store the strings in a form field, hidden or otherwise, but you could
also do this:

var someStrings = "<% ASP code here to output the strings %>";

The ASP code to generate the strings is executed on the server and will
be done before the browser reads in the JavaScript code your ASP code
generated.

Mike wrote:
[color=blue]
>I have an ASP.NET webform that has an HTML button (with an onClick
>event that calls a javascript function) and a Web Forms button (the
>code behind click event saves data back to a SQL DB).
>
>The javascript function basically creates a variable such as:
>
>var someStrings = "foo1.jpg,foo2. jpg,foo3.jpg,fo o4.jpg"
>
>I really need to be able to access this javascript variable from the
>Click event of my Web Forms button so that I can pull the file names
>out of this string and do some database work on them.
>
>Any ideas? I've thought of putting a web forms textbox on the form
>and having my javascript function place the string contents in there
>which is easily accessible by my web forms button click event, however
>now I have an unsightly textbox that should not be on my form.
>
>Is there an easier way to access the contents of a javascript
>(client-side) variable from the click event of my web forms button?
>
>Thanks!
>
>[/color]