Leverage JavaScript to retrieve the formatting of an element from an external CSS stylesheet

Check out this HTML snippet:

<html>
    <head>
        <link rel="stylesheet" type="text/css" media="all" href="style.css">
    </head>

    <body>
        <div id="test">Testing</div>

        <script>
            alert(document.getElementById('test').style.display);
        </script>
    </body>
</html>

This is the content of style.css:

div {
    display:none;
}

The issue I'm facing is that instead of getting "none", the JavaScript code returns an empty string. Any suggestions on how to fix this problem would be greatly appreciated!

javascripthtmlcss

Answer №1

This solution is compatible with modern browsers that adhere to web standards (excluding IE - due to its use of currentStyle/runtimeStyle).

<body>
    <div id="test">Testing</div>

    <script type="text/javascript">
        window.onload = function() {
            alert(window.getComputedStyle(document.getElementById('test'),null).getPropertyValue('display'));
        }
    </script>
</body>

Answer №2

If you want to retrieve the display style property indirectly, you'll need to obtain the computed value instead of setting it directly in the code provided above.

For instructions on how to achieve this, please visit the following page: Get styles

To effectively retrieve the value, follow these steps:

var displayValue = getStyle("test", "display");

function getStyle(el,styleProp)
{
    var x = document.getElementById(el);
    if (x.currentStyle)
        var y = x.currentStyle[styleProp];
    else if (window.getComputedStyle)
        var y = document.defaultView.getComputedStyle(x,null).getPropertyValue(styleProp);
    return y;
}

Answer №3

The CSS file may not have loaded yet. Make sure to enclose your JavaScript code within an "on-ready" event.

<body onload="alert(document.getElementById('test').style.display);">

Did this solution resolve the issue for you?

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