Selecting elements with a certain background color

Question

I want to select a bunch of spans in a div whose CSS contains a particular background color. How do I achieve this?

Answer 1

if i understand the question correctly, the selector [attribute=value] will not work because <span> does not contain an attribute "background-color". you can test that out quickly to confirm it won't match anything:

$('#someDiv span[background-color]').size(); // returns 0

given:

.one, .two {
  background-color: black;
}

.three {
  background-color: red;
}

here's a snippet that will work:

$('div#someDiv span').filter(function() {
    var match = 'rgb(0, 0, 0)'; // match background-color: black
    /*
        true = keep this element in our wrapped set
        false = remove this element from our wrapped set
                                                         */
    return ( $(this).css('background-color') == match );

}).css('background-color', 'green'); // change background color of all black spans

.one, .two {
  background-color: black;
}

.three {
  background-color: red;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>

<div id="someDiv">
    <span class="one">test one</span>
    <span class="two">test two</span>
    <span class="three">test three</span>
</div>