Is it possible to change only the alpha of a rgba background colour on hover?

Question

I have a set of tags with differing rgba background colours but the same alpha. Is it possible to write a single css style that will change only the o

Answer 1

I faced a similar problem. Here's what I did and it works fine( only alpha changes on hover and also the text is not affected) by the following steps:

1) Apply a highlighted(or any of your choice) class to whichever element you wish to change background alpha of.

2) Get the background color rgba

3) Store it in a string and manipulate it(change alpha) as you want on hover(mouseenter and mouseleave)

HTML Code:

Link 1



Link 1

CSS Code:

.brown {background-color: rgba(118,76,41,.8);}
.green {background-color: rgba(51,91,11,.8);}

Javascript Code:

$(document).on({

            mouseenter: function() {

            var rgba_str = $(this).css("background-color");
            var new_rgba_str ="rgba(" + rgba_str.substring(rgba_str.lastIndexOf("(")+1,rgba_str.lastIndexOf(",")) + ", 0.5)";   

                $(this).css("background-color",new_rgba_str ); 
               },

             mouseleave: function(){

                 var rgba_str = $(this).css("background-color");

            var new_rgba_str ="rgba(" + rgba_str.substring(rgba_str.lastIndexOf("(")+1,rgba_str.lastIndexOf(",")) + ", 0.8)";               
                $(this).css("background-color",new_rgba_str ); 

               }

        },'.highlighted');

Working Fiddle:http://jsfiddle.net/HGHT6/1/