comparing rgb color code in php

Question

Following is my code :

<div id="accept" style="background-color:#83CC3F;"></div>
<script type="text/javascript" >
function accept1() {
return document.getElementById('accept').style.backgroundColor;
}
 </script>
<?php
$js=<<<EOF
<script type="text/javascript" >
document.write(accept1());
 </script>
EOF;
echo $js;
if($js == "rgb(131, 204, 63)") //rgb(131, 204, 63) rgb equivalent of hex code #83CC3F
{
echo "yes"; 
}
?>

Above code doesn't return "yes" whereas $js=rgb(131, 204, 63) , Please solve my problem

@DushyantJoshi above code is just demo code i will later use ajax when i implement above code in my project,my problem is in comparision of "if statement" which return false rather than true — user47288, May 28 '14 at 06:04
@user47288, You will get proper value when you will be using AJAX. The above code is wrong. See my answer — Dushyant Joshi, May 28 '14 at 06:05
thank you @DushyantJoshi for your ans,i have one more ques that "how to get css property(internal css) of an element in javascript?" — user47288, May 28 '14 at 14:54
@user47288, check here http://www.quirksmode.org/dom/getstyles.html. If you do not understand ask a different question with your trials so that others or I can answer it — Dushyant Joshi, May 28 '14 at 15:46

Dushyant Joshi · Accepted Answer · 2014-05-28T07:27:40.940

you can't take var like this in php..

$js=<<<EOF
<script type="text/javascript" >
document.write(accept1());
 </script>

because php is server side language .. and javascript is client side.

For this you have to use ajax ,get and post methods

UPDATE1:

It's always always important to remember that Javascript executes on the clients browser, & PHP executes on the server. So $js has no idea what

<script type="text/javascript" >
document.write(accept1());
 </script>

will be, because that won't execute until it reaches the viewers browser. & just as well, once the viewers browser gets it, PHP is done executing, so it can't hand the output off.

UPDATE2: If you do the following it will echo yes.

if($js == '<script type="text/javascript" >document.write(accept1());</script>'); //rgb(131, 204, 63) rgb equivalent of hex code #83CC3F
{
echo "yes"; 
}

This is because PHP variable $js still has <script type="text/javascript" >document.write(accept1());</script> value set.

Carefully read my update in the answer(also in bold). It clearly resolves your doubt. — Dushyant Joshi, May 28 '14 at 06:42
See the Jordan Answer here http://stackoverflow.com/questions/8191124/send-javascript-variable-to-php-variable — Dushyant Joshi, May 28 '14 at 06:50

score 0 · Answer 2 · answered May 28 '14 at 06:04

Your must check this codes in js, but PHP not render the content and not get color from html element.

For checking RGB by eq to HEX, you can convert each part RGB to DEC and concatenation this string, and after check eq.

For example RGB(10, 20, 30):

DECTOHEX(10) . DECTOHEX(20) . DECTOHEX(30) == '#0A141E'

comparing rgb color code in php

2 Answers2