Write code in php for css .....

Alidad

Hi, I'm trying to figure out how to write that code in php, let say that i have home page that come with css color templates, each templates have one same color, yellow, blue or green.

and i created three css files, called yellow.css, blue.css and green.css. The home page set default to yellow page which yellow.css. if person want to change template color to blue and change deafult to blue, how can i write that code in php to change css file to the blue css file!

you can see sample from yahoo.com on top right, where you allow to change color of templates, I'm trying to make just like that how can i write that code to allow customer to select color and auctomatic change templates by change css file name and set default after change it!

please help!

thanks.

dagon

if($_GET['colour']=='red') echo '<link href="red.css" type="text/css" rel="stylesheet" />';

Alidad

Thanks for response, but i do not think that will works because, when i put the css file name in the code, for sample the default css file name is yellow.css in index.php, and if i selected red and change to red templates, we must find way to remove the yellow.css file name from code first and input the new css file name (red.css) otherwise the code will get confused from both css file name.

how can I remove that and change to other css name!

Warmaster

Alidad,

 I ran into this situation just this week. My problem was I was wanting to change the css files for browser dependency. I did figure it out. Yours is much simpler. Here is how I did it. Now, don't get me wrong here though, I am new at this and this may not be the best way or the right way to do it, but it worked for me:

<?
//Assign variables to the head and body tags
<html>
$head = '<head>';
$head_close = '</head>';
$default = '<link href="default.css" type="text/css" rel="stylesheet" />';
$red = '<link href="red.css" type="text/css" rel="stylesheet" />';
$yellow = '<link href="yellow.css" type="text/css" rel="stylesheet" />';
echo '$head';

  if($_GET['colour']=='red')
{
           echo $red; 
}elseif ($_GET['colour']=='yellow')
{
           echo $yellow;
} else {
         echo $default;
}

echo '$head_close';

/* You can assign your body tag to html if you want also, it doesn't matter, you
 can mix and match your tags between php and html but I prefer to go one way
with it. I find that this serves my purposes better but I ran into some problems 
with it, nothing that can't be overcome though. Hope this helps */
?>
<body>
<form action ="<?=$_SERVER['PHP_SELF']?>" method='get'>
drop down menu goes here for color picker
</form>
</body>

There you go, I hope someone can use this. If there is another way to do this simpler, then let me know.

Warmaster

dagon

your form method should be get not post in this example, otherwise that should do the trick, to keep the setting across pages uses a cookie\sessions.

Warmaster

Ok, I understand that $GET pulls the data from the form and assigns them inside the url. I understand $POST just pulls the data from the form and assigns values to them. How does a programmer know when to use which one? Why use $GET here and not $POST because $_POST worked just fine for me in this example (my form action was a different php handler).

I think that may be part of it, but not 100% sure. So...to summarize, if the page is handling the form data on the same page do I use GET, and if the form is handled by a different script do I use post?

Thanks!

Warmaster

Weedpacket

Warmaster wrote:
Why use $GET here and not $POST

GET is for getting stuff from the server. POST is for posting stuff to the server. Which is why GET is called GET and POST is called POST.

Beyond that, one of the key distinctions between GET and POST is that making the same GET request twice in a row should not break anything, and should have the same effect as only making it once (a property known as "idempotence"). That's certainly the case here: "I want a YELLOW stylesheet. No! I want a YELLOW stylesheet!"

See chapter 9 of the HTTP specification (RFC2616) for the full guff.

Also, your <form> tag specified the POST method; so the submitted data will be in the $POST array. If you want to use the $GET array, the form would need to specify the GET method (or not specify a method at all, since GET is the default).

Warmaster

Thanks for the clarification Weedpacket. I fixed my error and now understand the key differences between the two 🙂

Warmaster

ScoobyDooobyD00

Or you can use Sessions. This might be more difficult to understand but it will keep your urls clean.

Here is an example of how you would display your links.

<?php
session_start();
if(!$_SESSION['pageColor']) {
	$_SESSION['pageColor'] = "yellow";
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Change this pages CSS Style</title>
<link rel="stylesheet" href="./<?=$_SESSION['pageColor'];?>.css" type="text/css" />

</head>

<body>
Change this pages theme.<br />
<?php
$colors = array("blue", "yellow", "green");
foreach($colors AS $color) {
	if($color != $_SESSION['pageColor']) {
		echo "<a href=\"changeColor.php?color=" . $color . "&location=" . $_SERVER['PHP_SELF'] . ">" . $color . "</a><br />\n";
	}
}
?>
</body>
</html>

And here's changeColor.php

<?php
if(isset($_GET['color'])) {
	$colors = array("blue", "yellow", "green");
	if(in_array($_GET['color'], $colors)) {
		$_SESSION['pageColor'] = $_GET['color'];
		header("Location: $location");
	}else {
		header("Location: $location");
	}
}else {
	header("Location: $location");
}
?>

I hope this helps.