Question

I want get background color and putting it in body, for example my background is as in class FirstColor:

.FirstColor{
    background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#ECAA63), to(#E36D0A));
}

Now i want get colors #ECAA63 and #E36D0A of background in class .FirstColor and replace they instead colors in body

body is as:

body{
    background: -webkit-gradient(radial, 50% 50%, 0, 50% 50%, 350, from(#CEEEEE), to(#98BFF1));
}

Replace they of class .FirstColor to body as:

#ECAA63 – instead -> #CEEEEE
#E36D0A – instead -> #98BFF1

I tried to get background color ac: http://jsfiddle.net/rKQwu/ But can not done.

Answer 1

First of all, why not just switch the classes of the divs instead of modifying the styles directly?

But if there’s a reason you need to do it, then you need to parse the from and to values from the style value. As I said in my comment, your code seems to be fine in your jsfiddle; the problem appears to be that you selected MooTools instead of jQuery for your library, and after I switched that, it worked as expected. I don’t know much about the Webkit standard, but on Chrome 23, the hex values are converted to rgb(r, g, b) style triplets, so I wrote a little code to parse those out:

var bgGrad = $('.FirstColor').css("background");
var parseRgb = (function (rgbStr) { return rgbStr.match(/rgb\(([0-9]+), ([0-9]+), ([0-9]+)\)/); });
var fromStr = bgGrad.match(/from\((.*)\),/)[1];
var fromRgb = parseRgb(fromStr);

var toStr = bgGrad.match(/to\((.*)\)\)/)[1];
var toRgb = parseRgb(toStr);

alert('From rgb: ' + fromRgb.slice(1,4) + '\nTo rgb: ' + toRgb.slice(1, 4));
​

After this code (in the jsfiddle here), fromRgb and toRgb are arrays of 3 rgb values. It should be trivial to rebuild a new background gradient string once the values are extracted and modified as you see fit. I don’t know enough to know how robust this code is to different cases, but it seems to work fine for me on the above Chrome version for the example you gave.