How to retrieve javascript object value in PHP ?

[phdfromic]

I want to set an initial text in a TEXTAREA based on the value selected
in an earlier SELECT box in the same document.

I tried something like

$init_text=set_init_text() ;
<TEXTAREA>
<?php echo $init_text ; ?>
</TEXTAREA>

function set_init_text() {
return <script>
document.forms[0].SelectBox.options[document.forms[0].SelectBox.selectedIndex].value
</script }
But I get a php syntax error with the <script> tag.

What's the correct way to do it ?

[Peter Fox]

Following on from 's message. . .

I want to set an initial text in a TEXTAREA based on the value selected
in an earlier SELECT box in the same document. Sorry but you have completely mis-understood how php works.

Client browser - "Web server! send me this resource"
Web server - "OK" [ FX rummages around while running AND FINISHING a php
script] "Here it is now - Thank you and have a nice day"
Client browser - "User I will show you the HTML just sent to me by the
server"
Javascript = client side
php = server side. [ie no interaction]


I tried something like

$init_text=set_init_text() ;
<TEXTAREA>
<?php echo $init_text ; ?>
</TEXTAREA>

function set_init_text() {
return <script>
document.forms[0].SelectBox.options[document.forms[0].SelectBox.selectedInde
x].value
</script }
But I get a php syntax error with the <script> tag.

What's the correct way to do it ?

--
PETER FOX Not the same since the pancake business flopped
pe******@eminent.demon.co.uk.not.this.bit.no.html
2 Tees Close, Witham, Essex.
Gravity beer in Essex <http://www.eminent.demon.co.uk>

[Steve]

On Mon, 09 Jan 2006 09:32:42 +0000, Peter Fox wrote:

No interaction, but php can quite happily write js just as easily as it
can write html/xhtml/xml/...

Following on from 's message. . .

I want to set an initial text in a TEXTAREA based on the value selected
in an earlier SELECT box in the same document.

Sorry but you have completely mis-understood how php works.

Client browser - "Web server! send me this resource" Web server - "OK"
[ FX rummages around while running AND FINISHING a php script] "Here it
is now - Thank you and have a nice day" Client browser - "User I will
show you the HTML just sent to me by the server"
Javascript = client side
php = server side. [ie no interaction]

I tried something like

$init_text=set_init_text() ;
<TEXTAREA>
<?php echo $init_text ; ?>
</TEXTAREA>

function set_init_text() {
return <script>
document.forms[0].SelectBox.options[document.forms[0].SelectBox.selectedInde
x].value
</script }
But I get a php syntax error with the <script> tag.

What's the correct way to do it ?

[Ike]

Do an HTTP POST (or GET) of a form, where you send the object from
Javascript, calling the same page to rerender. When the page loads, in php,
check if the value was sent. Suppose I have a js variable 'x'. I then put it
in a hidden text field say, on a form, and POST the form.

When the page reloads, it tests to see if x has been "set" in javascript
(i.e. POSTED):

$x = $_POST['x'];

if $x =="" then it is the first time the form was loaded and x has not been
set in js. (or, a subsequent time for loading the form after a POST and x
was never set in js). You may want to check too if x==null, not sure if it
is null or "". -Ike