Using JQuery and/or Selenium/WebDriver to ascertain the visible color of elements on a webpage

Is there a way to accurately determine the visible color of page elements? When using JQuery, I can retrieve the background-color of an element with the following code:

$('#foo').css('background-color');

However, the background-color of #foo may be returned as "transparent" even if one of its parent elements has a colored background. How can I get the correct visible color that end users see, including semi-transparency and RGBA values?

Update

I am currently utilizing the Selenium2 Java API with Firefox 5. Is there a method to achieve this without relying on JQuery? Perhaps involving screenshots?

Update 2

I have revised and expanded my query in this question: Get dominating color of a specific area in an image: Color Query for Web Page Elements

jqueryhtmlcsscolorsselenium-webdriver

Answer №1

To locate the element with a background-color, you must navigate up the tree. One method I used is as follows (where textureEl represents the desired element):

bgcolor = $(textureEl).css('background-color'); 
if (isTransparent(bgcolor)){
    $(textureEl).parents().each(function(){
        if (!isTransparent($(this).css('background-color'))){
            bgcolor = $(this).css('background-color');
            return false;
        }

    });
}

and

function isTransparent(bgcolor){
    return (bgcolor=="transparent" || bgcolor.substring(0,4) == "rgba");
}

It's important to note that my isTransparent function considers any non-100% opacity value as transparent. If this is not desired, adjustments may need to be made for rgba colors.

This method does not address background-images, but since your question did not mention them and they were not relevant to my application, they were not accounted for in the code.

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