why won't this work?

cleary1981 · June 30, 2008

I have written a script that should display a discription that is stored in a db for each item in a dropown list. problem is that it doesnt update the description. Heres my html code

<script type="text/javascript" 
        src="prototype.js"></script>
<script type="text/javascript"
        src="scriptaculous.js"></script>
<script language="javascript" src="list.php"></script>
<script type="text/javascript" src="getdimensions.js"> </script>

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

<script type="text/javascript">
window.onload = function() {
     new Draggable('object', {snap:25} );
fillCategory();
}

var request = null;

try {
request = new XMLHttpRequest();
} catch (trymicrosoft) {
try {
request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (othermicrosoft) {
try {
request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
	request = null;
	}

}
}
if (request == null)
alert("Error creating XMLHttp Request!");

function get_description() {
var model = document.getElementById("model").value;
var url = "lookupdescription.php?model=" + escape(model);
request.open("GET", url, true);
request.onreadystatechange = updatePage;
request.send(null);
}

function updatePage() {
if (request.readyState == 4) {
var description = request.reponseText;
document.getElementById("description").value = description;

}
}

</script>


</head>

<body bgcolor="#ffffff" text="#000000" link="#0000ff" vlink="#800080" alink="#ff0000">

<div id="container">
<div id="top">
	<h1>TES - Pricing System (Design Mode)</h1>
</div>

<div id="leftSide">
	<fieldset>
	<legend>Module</legend>
	<FORM name="drop_list">
	<label for="type">Type</label>
	<div class="div_texbox">
		<SELECT  NAME="Category" onChange="SelectSubCat();" >
		<Option value="">Select Type</option>
		</SELECT>
	</div>
  		<label for="mod_named">Model</label>
    		<div class="div_texbox">
		<SELECT id="model" NAME="SubCat" onChange="get_description();">
		<Option value="">Select Model</option>
		</SELECT>
	</div>
	<fieldset>
	<legend>Description</legend>
	<span id="description">description goes here</description>
	</fieldset>
	<label for="mod_name">Name</label>
    		<div class="div_texbox">
    			<input name="username" type="text" class="username" id="username" value="" />
	</div>
	<div class="button_div">
		<input name="Submit" type="button" value="Generate" class="buttons" onClick="generate_module()"/>
	</div>
	</form>
	</fieldset>

	<fieldset>
	<fieldset>
	<legend>Delete</legend>
	</fieldset>
	<fieldset>
	<legend>Generated Module</legend>
	<img id="object">
	</fiedset> 
	</fieldset>	
</div>


<div id="content">
	<div id="drop_area">

	</div>
</div>  

  	<div class="clear"></div>
</div>

</body>
</html>

and my php

<?php

require "config.php";

$type = $_REQUEST['model'];
$select = 'SELECT mod_desc';
$from = ' FROM module';
$where = ' WHERE type = \'' .$type' . '\'';

$queryResult = @mysql_query($select . $from . $where);
if (!queryResult)
die('Error retrieving description from the database');

while ($row = mysql_fetch_array($queryResult)) {
echo $row['mod_desc'];
}

mysql_close($conn);
?>

DeanWhitehouse · June 30, 2008

Try this, and see if there is an error in your statement

<?php

require "config.php";

$type = $_REQUEST['model'];

$select = 'SELECT mod_desc';

$from = ' FROM module';

$where = ' WHERE type = \'' .$type' . ''';

$queryResult = mysql_query($select . $from . $where) or die("Error!".mysql_error());

while ($row = mysql_fetch_array($queryResult)) {

echo $row['mod_desc'];

}

mysql_close($conn);

?>

cleary1981 · June 30, 2008

I tried that and it didn't do anything. Any other suggestions?

DeanWhitehouse · June 30, 2008

Is

mod_desc

definetly a row?

try adding

error_reporting(E_ALL);

to the top of the script

cleary1981 · June 30, 2008

it is definatley a row in the module table. I tried adding that line to the php script but it did nothing.

DeanWhitehouse · June 30, 2008

can u post the current code with changes you made.

cleary1981 · June 30, 2008

<!doctype html public "-//w3c//dtd html 3.2//en">
<html>
<head>
<title>TES - Pricing System</title>
<link rel="stylesheet" type="text/css"
href="style.css" />
<script src="ShowDescription.js">
</script>
<script type="text/javascript" 
        src="prototype.js"></script>
<script type="text/javascript"
        src="scriptaculous.js"></script>
<script language="javascript" src="list.php"></script>
<script type="text/javascript" src="getdimensions.js"> </script>

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

<script type="text/javascript">
window.onload = function() {
     new Draggable('object', {snap:25} );
fillCategory();
}

var request = null;

try {
request = new XMLHttpRequest();
} catch (trymicrosoft) {
try {
request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (othermicrosoft) {
try {
request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
	request = null;
	}

}
}
if (request == null)
alert("Error creating XMLHttp Request!");

function get_description() {

var model = document.getElementById("model").value;
var url = "lookupdescription.php?model=" + escape(model);
request.open("GET", url, true);
request.onreadystatechange = updatePage;
request.send(null);
}

function updatePage() {
if (request.readyState == 4) {
var description = request.reponseText;
document.getElementById("description").value = description;

}
}

</script>


</head>

<body bgcolor="#ffffff" text="#000000" link="#0000ff" vlink="#800080" alink="#ff0000">

<div id="container">
<div id="top">
	<h1>TES - Pricing System (Design Mode)</h1>
</div>

<div id="leftSide">
	<fieldset>
	<legend>Module</legend>
	<FORM name="drop_list">
	<label for="type">Type</label>
	<div class="div_texbox">
		<SELECT  NAME="Category" onChange="SelectSubCat();" >
		<Option value="">Select Type</option>
		</SELECT>
	</div>
  		<label for="mod_named">Model</label>
    		<div class="div_texbox">
		<SELECT id="model" NAME="SubCat" onChange="get_description();">
		<Option value="">Select Model</option>
		</SELECT>
	</div>
	<fieldset>
	<legend>Description</legend>
	<span id="description">description goes here</description>
	</fieldset>
	<label for="mod_name">Name</label>
    		<div class="div_texbox">
    			<input name="username" type="text" class="username" id="username" value="" />
	</div>
	<div class="button_div">
		<input name="Submit" type="button" value="Generate" class="buttons" onClick="generate_module()"/>
	</div>
	</form>
	</fieldset>

	<fieldset>
	<fieldset>
	<legend>Delete</legend>
	</fieldset>
	<fieldset>
	<legend>Generated Module</legend>
	<img id="object">
	</fiedset> 
	</fieldset>	
</div>


<div id="content">
	<div id="drop_area">

	</div>
</div>  

  	<div class="clear"></div>
</div>

</body>
</html>

<?php

require "config.php";
error_reporting(E_ALL);

$type = $_REQUEST['model'];
$select = 'SELECT mod_desc';
$from = ' FROM module';
$where = ' WHERE type = \'' .$type' . ''';

$queryResult = mysql_query($select . $from . $where) or die("Error!".mysql_error());
while ($row = mysql_fetch_array($queryResult)) {
echo $row['mod_desc'];
}


mysql_close($conn);
?>

AndyB · June 30, 2008

I tried ... but it did nothing.

You need to provide a far better description than that. Did you get an error? Did you get a blank white screen? Did you try to display the actual query string and check it's what you thought it was going to be?

cleary1981 · June 30, 2008

when i say it did nothing i mean that the page displayed as normal no error message. The onchange did not affect the page in any way.

DeanWhitehouse · June 30, 2008

then thats a js problem, not php

cleary1981 · June 30, 2008

I have changed the span i was using to display my result to a textarea. When the onchange runs now im getting 'undefined'. This is php i think

revraz · June 30, 2008

onchange is JS

cleary1981 · June 30, 2008

its the js that runs my php code

revraz · June 30, 2008

Undefined means just that. The variable you are trying to use is not defined.

DeanWhitehouse · June 30, 2008

Have you tried running the php code on it's own to see if it works, as this isn't a php problem so it should be moved to the js forum.

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why won't this work?

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