JSP and Javascripts on same page (Passing values to JSP fromJavascript)

[Husain]

Hello.

I have a button on a form which goes to a function validate in
javascript as shown below:

<input type="button" name="<%= i%>" value="Edit"
onclick="valida te(this.name)">

The javascript:

<script language="javas cript">
var Action="";
function validate(Action ){
var actstring = Action.toString ();
ivalue = parseInt(actstr ing);
return confirm('Ok for this action : '+ivalue+' ?'); //this is to
test
}
</script>

I am changing the ivalue to an integer which eventually will access an
array built on the same page but using JSP. How can I pass the ivalue
back to the JSP?

Thank you.

[Tom de Neef]

Re: JSP and Javascripts on same page (Passing values to JSP from Javascript)

"Husain" <husranger@gmai l.com>

I am changing the ivalue to an integer which eventually will access an
array built on the same page but using JSP. How can I pass the ivalue
back to the JSP?
>

Not very elegant: store it (as a string) in an invisible element of the
document. JSP can read it there.
Tom

[Thomas 'PointedEars' Lahn]

Re: JSP and Javascripts on same page (Passing values to JSP fromJavascript)

Husain wrote:

I have a button on a form which goes to a function validate in
javascript as shown below:
>
<input type="button" name="<%= i%>" value="Edit"
onclick="valida te(this.name)">
>
The javascript:
>
<script language="javas cript">

<script type="text/javascript">

var Action="";
function validate(Action ){

By good convention, only identifiers referring constructors and constants
should begin with a capital letter. You should know that one from Java.

var actstring = Action.toString ();

The type conversion is unnecessary as the value is a string value already.

ivalue = parseInt(actstr ing);

Should be:

ivalue = parseInt(actstr ing, 10);

But since you are setting the value and not the user, this conversion is
unnecessary as well, at least in this particular code snippet.

return confirm('Ok for this action : '+ivalue+' ?'); //this is to
test
}
</script>
>
I am changing the ivalue to an integer which eventually will access an
array built on the same page but using JSP. How can I pass the ivalue
back to the JSP?

Suppose you have

<form action="...">
...
<input type="hidden" name="formactio n" value="">
...
</form>

you could write something along

<form action="..." onsubmit="valid ate(this)">
<script type="text/javascript">
function validate(f)
{
var action = arguments.calle e.action;
f.action = action;
return window.confirm( "Ok for this action: ' + action);
}
</script>

<input type="submit" name="foo" value="Foo me!"
onclick="valida te.action = this.name;">
</form>

But, as I said before in <news:4802A320. 9000903@Pointed Ears.de>, you should use

<form action="handles _foo_and_bar_su bmits.jsp" ...>
...
<input type="submit" name="foo" value="Foo me!">
<input type="submit" name="bar" value="Bar me!">
</form>

instead, so that your application degrades gracefully. Since this is not
exactly a new problem, I suggest you read these articles I posted not long ago:

<news:47F03E18. 2040702@Pointed Ears.de>
<news:47F50F52. 9060605@Pointed Ears.de>


A request in advance: *Please trim your quotes to the necessary minimum.*


PointedEars
--
Use any version of Microsoft Frontpage to create your site.
(This won't prevent people from viewing your source, but no one
will want to steal it.)
-- from <http://www.vortex-webdesign.com/help/hidesource.htm>

[Thomas 'PointedEars' Lahn]

Re: JSP and Javascripts on same page (Passing values to JSP fromJavascript)

Tom de Neef wrote:

"Husain" <husranger@gmai l.com>

>I am changing the ivalue to an integer which eventually will access an
>array built on the same page but using JSP. How can I pass the ivalue
>back to the JSP?

>
Not very elegant: store it (as a string) in an invisible element of the
document. JSP can read it there.

Not just any element, but <input type="hidden" ...in the form to be
submitted. Else JSP will _not_ get at the value.


PointedEars
--
var bugRiddenCrashP ronePieceOfJunk = (
navigator.userA gent.indexOf('M SIE 5') != -1
&& navigator.userA gent.indexOf('M ac') != -1
) // Plone, register_functi on.js:16