PHP Jquery select problem

Hi all,
I have taken from net chained select script.
here is all PHP and Javascript files but i dont understand one thing there.
index.php file
<?php include('db.php'); include('func.php'); ?> <!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=utf-8" /> <title>Chained Select Boxes using PHP, MySQL and jQuery</title> <script type="text/javascript" src="jquery-1.4.1.min.js"></script> <script type="text/javascript"> $(document).ready(function() { $('#wait_1').hide(); $('#drop_1').change(function(){ $('#wait_1').show(); $('#result_1').hide(); $.get("func.php", { func: "drop_1", drop_var: $('#drop_1').val() }, function(response){ $('#result_1').fadeOut(); setTimeout("finishAjax('result_1', '"+escape(response)+"')", 400); }); return false; }); }); function finishAjax(id, response) { $('#wait_1').hide(); $('#'+id).html(unescape(response)); $('#'+id).fadeIn(); } </script> </head> <body> <p> <form action="" method="post"> <select name="drop_1" id="drop_1" size="4"> <option value="" selected="selected" disabled="disabled">Select a Category</option> <?php getTierOne(); ?> </select> <span id="wait_1" style="display: none;"> <img alt="Please Wait" src="ajax-loader.gif"/> </span> <span id="result_1" style="display: none;"></span> </form> </p> <p> <?php if(isset($_POST['submit'])){ $drop = $_POST['drop_1']; $tier_two = $_POST['tier_two']; echo "You selected "; echo $drop." & ".$tier_two; } ?> <p><a href="three-tier/">View 3 Tier Select Box Example</a></p> </body> </html>
func.php file

<?php
//**************************************
//     Page load dropdown results     //
//**************************************
function getTierOne()
{
	$result = mysql_query("SELECT DISTINCT tier_one FROM two_drops") 
	or die(mysql_error());

	  while($tier = mysql_fetch_array( $result )) 
  
		{
		   echo '<option value="'.$tier['tier_one'].'">'.$tier['tier_one'].'</option>';
		}

}

//**************************************
//     First selection results     //
//**************************************


if($_GET['func'] == "drop_1" && isset($_GET['func'])) { 
   drop_1($_GET['drop_var']); 
}  

function drop_1($drop_var)
{  
    include_once('db.php');
	$result = mysql_query("SELECT * FROM two_drops WHERE tier_one='$drop_var'") 
	or die(mysql_error());
	
	echo '<select name="tier_two" id="tier_two" size="4">
	      <option value=" " disabled="disabled" selected="selected">Choose one</option>';

		   while($drop_2 = mysql_fetch_array( $result )) 
			{
			  echo '<option value="'.$drop_2['tier_two'].'">'.$drop_2['tier_two'].'</option>';
			}
	
	echo '</select> ';
	echo '<textarea rows="15 cols="12">dgd gdfg dgdfg</textarea>';
    echo '<input type="submit" name="submit" value="Submit" />';
}
?>

But i didnt understand what is

if($_GET['func'] == "drop_1" && isset($_GET['func'])) { 
   drop_1($_GET['drop_var']); 
}

in func.php file.
where is$_GET['func'] option. where is $_GET method used?
thanks inadvance!

azegurb

Posting Whiz in Training

244 posts since Sep 2009

Reputation Points: 11

Solved Threads: 2

3 Months Ago

0

In the first file:

$.get("func.php", {
  func: "drop_1",
  // ...

pritaeas

Posting Expert

Moderator

5,484 posts since Jul 2006

Reputation Points: 653

Solved Threads: 875

3 Months Ago

0

Thank you very much. bu i am still confused of $.get jquery method. Can you tell a little about it for what purposes it is used? what is the difference between $.ajax and $.get method. Thanks again for attention. if possible i will wait your responses

azegurb

Posting Whiz in Training

244 posts since Sep 2009

Reputation Points: 11

Solved Threads: 2

3 Months Ago

0

$.get() internally calls $.ajax() with type GET.

pritaeas

Posting Expert

Moderator

5,484 posts since Jul 2006

Reputation Points: 653

Solved Threads: 875

3 Months Ago

0

$.get() internally calls $.ajax() with type GET.

I am very sorry again.

if($_GET['func'] == "drop_1" && isset($_GET['func'])) { 
   drop_1($_GET['drop_var']); 
}

where is

$_GET['drop_var']

. how it can be retrieved via GET?

azegurb

Posting Whiz in Training

244 posts since Sep 2009

Reputation Points: 11

Solved Threads: 2

3 Months Ago

0

One line lower than the other two...

$.get("func.php", {
  func: "drop_1",
  drop_var: $('#drop_1').val()

pritaeas

Posting Expert

Moderator

5,484 posts since Jul 2006

Reputation Points: 653

Solved Threads: 875

3 Months Ago

0

Thank you veru much

azegurb

Posting Whiz in Training

244 posts since Sep 2009

Reputation Points: 11

Solved Threads: 2

PHP Jquery select problem

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