[SOLVED] PHP Session Variables in a form

DaisyWheel · #1 (**permalink**) Feb 12th, 2007, 17:33

Help, please, I'm going in circles with this.

I get the 'Warning: Cannot modify header information ' message at the top of the page, and onSubmit nothing happens.

Any ideas?

Thanks for any help!

PHP: Select all


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"

"[url]http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd[/url]">

<html xmlns = "[url]http://www.w3.org/1999/xhtml[/url]">

<head>

<?php

ob_start(); 

$_SESSION['confint'] = - - $_POST['ConfidenceInterval'];

$_SESSION['mood1'] = - - $_POST['mood-slider1'];

$_SESSION['mood2'] = - - $_POST['mood-slider2'];

$_SESSION['mood3'] = - - $_POST['mood-slider3'];

$_SESSION['mood4'] = - - $_POST['mood-slider4'];

header("Location:http://localhost/Dissertation/listen.php");

ob_end_flush();

?>

<title>Selection Page</title>

<script src="javascripts/prototype.js" type="text/javascript"></script>

<script src="javascripts/slider.js" type="text/javascript"></script>

<link rel="stylesheet" type = "text/css" href="dissertation.css"></link>

</head>

<body>

<p>

<p align="center">

 

<form name="sliderform" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>" id="slider-form">

<table border="0" cellpadding="1" width="100%" height="384">

 

<tr>

<td> <p align="justify"><font color="#000000">

<b>

<span><font face="Verdana">Selection</font></span>

</b>

</p>

</td>

</tr>

<tr>

<td valign="top">

 

<p><b>Confidence Interval</b></p>

<p>

<label>5%</label><input type="radio" checked name="ConfidenceInterval" value="0.05" >

<label>15%</label><input type="radio" name="ConfidenceInterval" value="0.15">

<label>25%</label><input type="radio" name="ConfidenceInterval" value="0.25" tabindex="3">

</p>

 

<p><b>Instructions to the User</b></p>

<ul>

<li>Select the confidence interval you wish to use</li>

<li>Set your mood levels using either the sliders or <br/>

the boxes at the end of each slider where you <br/>

can set the number</li>

<li>Click on the Submit button to retrieve tracks that <br/>

match the criteria</li>

</ul>

</td>

 

<td> 

<h2>Happy Slider</h2> 

<div id="track1" style="width:300px; background-color:#aaa; height:2px;">

<div id="mood1" style="width:10px; height:3px; background-color:#f00; cursor:move;"></div>

</div>

<p id="debug1">&nbsp;</p>

 

<h2>Mellow Slider</h2> 

<div id="track2" style="width:300px; background-color:#aaa; height:5px;">

<div id="mood2" style="width:10px; height:5px; background-color:#f00; cursor:move;"></div>

</div>

<p id="debug2">&nbsp;</p>

 

<h2>Sad Slider</h2> 

<div id="track3" style="width:300px; background-color:#aaa; height:10px;">

<div id="mood3" style="width:10px; height:5px; background-color:#f00; cursor:move;"></div>

</div>

<p id="debug3">&nbsp;</p>

 

<h2>Brooding Slider</h2> 

<div id="track4" style="width:300px; background-color:#aaa; height:10px;">

<div id="mood4" style="width:10px; height:5px; background-color:#f00; cursor:move;"></div>

</div>

<p id="debug4">&nbsp;</p>

</td>

</tr>

 

</table>

<input type="hidden" id="mood-slider1" name="mood-slider1" value="0" />

<input type="hidden" id="mood-slider2" name="mood-slider2" value="0" />

<input type="hidden" id="mood-slider3" name="mood-slider3" value="0" />

<input type="hidden" id="mood-slider4" name="mood-slider4" value="0" />

<input type="submit" name="submit" value="Retrieve Tracks" />

</form>

<script type="text/javascript" language="javascript">

// <![CDATA[

 

// horizontal slider1 control

new Control.Slider('mood1', 'track1', {

onSlide: function(v) { $('debug1').innerHTML = "<font size=-1>slide: " + v; $('mood-slider1').value = v +"<font/>"; },

onChange: function(v) { $('debug1').innerHTML = "<font size=-1>value: " + v; $('mood-slider1').value = v +"<font/>"; }

});

 

// horizontal slider2 control

new Control.Slider('mood2', 'track2', {

onSlide: function(v) { $('debug2').innerHTML = "<font size=-1>slide: " + v; $('mood-slider2').value = v +"<font/>"; },

onChange: function(v) { $('debug2').innerHTML = "<font size=-1>value: " + v; $('mood-slider2').value = v +"<font/>"; }

});

 

// horizontal slider3 control

new Control.Slider('mood3', 'track3', {

onSlide: function(v) { $('debug3').innerHTML = "<font size=-1>slide: " + v; $('mood-slider3').value = v +"<font/>"; },

onChange: function(v) { $('debug3').innerHTML = "<font size=-1>value: " + v; $('mood-slider3').value = v +"<font/>"; }

});

 

// horizontal slider4 control

new Control.Slider('mood4', 'track4', {

onSlide: function(v) { $('debug4').innerHTML = "<font size=-1>slide: " + v; $('mood-slider4').value = v +"<font/>"; },

onChange: function(v) { $('debug4').innerHTML = "<font size=-1>value: " + v; $('mood-slider4').value = v +"<font/>"; }

});

// ]]>

</script>

</body>

</html>

DaisyWheel · #2 (**permalink**) Feb 12th, 2007, 20:02

Thanks to anyone who read this.

I don't nee the help now as I have found a way around it.

masonbarge · #3 (**permalink**) May 7th, 2007, 19:24

Just saw this, sorry. You need to put all the session info first, before you send anything to be displayed in the browser. AFAIK it needs to go even before the DOCTYPE declaration.

PHP: Select all


 <?php
ob_start(); 
$_SESSION['confint'] = - - $_POST['ConfidenceInterval'];
$_SESSION['mood1'] = - - $_POST['mood-slider1'];
$_SESSION['mood2'] = - - $_POST['mood-slider2'];
$_SESSION['mood3'] = - - $_POST['mood-slider3'];
$_SESSION['mood4'] = - - $_POST['mood-slider4'];
header("Location:http://localhost/Dissertation/listen.php");
ob_end_flush();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
 <html xmlns = "http://www.w3.org/1999/xhtml">
 <head>

If you want to use the output buffer to avoid this, use it for the html.

Donny Bahama · #4 (**permalink**) May 7th, 2007, 19:32

ob_start() needs to go before the DOCTYPE selector, but ob_end_flush() can go anywhere. Personally, I typically place it just before my opening <form> tag. (If you're going to display a form, you're truly ready to output content to the page, right?) This works well for me.

DaisyWheel · #5 (**permalink**) Oct 12th, 2007, 09:56

I've not been logged in for a while. Happily I finished my dissertation and passed with flying colours. Thansk for all your help on this I really appreciate it. I know that when I have my next web project, I shall be back to ask more questions.

I'll also check in from time to time to see if I can help some other poor stuck soul.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[SOLVED] php re-writing variables in config from form	Emzi	PHP Forum	2	Jan 22nd, 2008 07:58
Session variables	ideleon	PHP Forum	2	Feb 7th, 2006 08:04
Session Variables....	courtjester	Classic ASP	11	Jul 6th, 2004 00:04
Session Variables	ekendricks	Classic ASP	4	Dec 19th, 2003 06:33
Session Variables	ekendricks	Classic ASP	7	Aug 26th, 2003 10:42

		Webforumz.com > Main Forums > Program Your Website > PHP Forum
[SOLVED] PHP Session Variables in a form