I'm trying to learn HTML and PHP. In an example which i found over the internet i need to set a variable to the submit button. So when the submit button is pressed, this page reloads, with a variable in the address bar,the variable is the one from the drop down menu. like this :
test.php?idneeded=$variable
in which the $variable is selected by the user and then the page reloads to show specific content related to the chosen option.
For example :
test.php?idneeded=40
(40 is "MadTechie" from the drop down form)
the code i found is this :
<?php
if( isset($_GET['ajax']) )
{
//In this if statement
switch($_GET['ID'])
{
case "LBox2":
$Data[1] = array(10=>"-Tom", 20=>"Jimmy");
$Data[2] = array(30=>"Bob", 40=>"-MadTechie");
$Data[3] = array(50=>"-One", 60=>"Two");
break;
//Only added values for -Tom, -MadTechie and -One (10,40,50)
case "LBox3":
$Data[10] = array(100=>"One 00", 200=>"Two 00");
$Data[40] = array(300=>"Three 00");
$Data[50] = array(1000=>"10000");
break;
}
echo "<option value=''></option>";
foreach($Data[$_GET['ajax']] as $K => $V)
{
echo "<option value='$K'>$V</option>\n";
}
mysql_close($dbh);
exit; //we're finished so exit..
}
$Data = array(1=>"One", 2=>"Two", 3=>"Three");
$List1 = "<option value=''></option>";
foreach($Data as $K => $V)
{
$List1 .= "<option value='$K'>$V</option>\n";
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Simple Dymanic Drop Down</title>
<script language="javascript">
function ajaxFunction(ID, Param)
{
//link to the PHP file your getting the data from
//var loaderphp = "register.php";
//i have link to this file
var loaderphp = "<?php echo $_SERVER['PHP_SELF'] ?>";
//we don't need to change anymore of this script
var xmlHttp;
try
{
// Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}catch(e){
// Internet Explorer
try
{
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}catch(e){
try
{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}catch(e){
alert("Your browser does not support AJAX!");
return false;
}
}
}
xmlHttp.onreadystatechange=function()
{
if(xmlHttp.readyState==4)
{
//the line below reset the third list box incase list 1 is changed
document.getElementById('LBox3').innerHTML = "<option value=''></option>";
//THIS SET THE DAT FROM THE PHP TO THE HTML
document.getElementById(ID).innerHTML = xmlHttp.responseText;
}
}
xmlHttp.open("GET", loaderphp+"?ID="+ID+"&ajax="+Param,true);
xmlHttp.send(null);
}
</script>
</head>
<body>
<!-- OK a basic form-->
<form method="post" enctype="multipart/form-data" name="myForm" target="_self">
<table border="0">
<tr>
<td>
<!--
OK here we call the ajaxFuntion LBox2 refers to where the returned date will go
and the this.value will be the value of the select option
-->
<select name="list1" id="LBox1" onchange="ajaxFunction('LBox2', this.value);">
<?php
echo $List1;
?>
</select>
</td>
<td>
<select name="list2" id="LBox2" onchange="ajaxFunction('LBox3', this.value);">
<option value=''></option>
<!-- OK the ID of this list box is LBox2 as refered to above -->
</select>
</td>
<td>
<select name="list3" id="LBox3">
<option value=''></option>
<!-- OK the ID of this list box is LBox3 Same as above -->
</select>
</td>
</tr>
</table>
<input type="submit" name="Submit" value="Submit" />
</form>
</body>
</html>
I haven't started learning JavaScript, and i need this for a project. I'll appreciate it if anyone can help me on this.
Thanks.