Is Javascript the new CSS:hover killer?

Hello, I'm currently working on implementing the Product Categories menu on this specific page:

Currently, when the page loads, the CSS hover effect works correctly to display a rollover effect. However, I attempted to use JavaScript to set the background position on click, which unfortunately interfered with the CSS hover functionality.

The code snippet I used was: onclick="setStyle('c1','backgroundPosition','0px 0px');

After adding this JavaScript, the c1:hover no longer functions as expected. I tried using !important in the CSS for c1:hover background position and it solved the issue in Firefox but not in Internet Explorer.

My question is, how can I write a JavaScript function that also accomplishes this task:

onclick="setStyle('c1:hover','backgroundPosition','-276px 0px');

I understand that JavaScript does not recognize hyphens and typically requires camel case such as "backgroundPosition" instead of "background-position". Is there a way to target the CSS hover attribute within my JavaScript function?

javascriptcsshoverrollover

Answer №1

When an element's background position is set using style.backgroundPosition, it functions the same as setting an inline style attribute style="background-position: ...". This results in the inline style overriding any stylesheet rules related to hover and non-hover effects on the background position.

To allow stylesheet rules to take precedence, consider removing the backgroundPosition rule for unselected elements. However, a more efficient approach would involve refactoring your code by toggling a class to indicate the selected link, as demonstrated below:

.c { background: url(...); }
#c1.selected, #c1:hover { background-position: -276px 0; }
#c2.selected, #c2:hover { background-position: -276px -61px; }
...

HTML markup:

<h2><a class="c selected" id="c1" href="#productcats">Products</a></h2>
<a class="c" id="c2" href="#rice">Rice</a>
...

(Note: Using a inside h2 due to HTML restrictions.)

JavaScript snippet:

var selected= $('#c1');
$('.c').click(function() {
    // Transfer 'selected' class to the clicked element
    //
    selected.removeClass('selected');
    selected= $(this);
    $(this).addClass('selected');

    // Scroll the target element into view
    //
    var y= $(this.hash).offset().top-$('#slide').offset().top;
    $('#slide').animate({top: -y+'px'}, {duration: 450, queue: false});

    return false;
});

It's important to utilize the links' href attributes for navigation, enhancing accessibility across all browsers. Additionally, consider implementing functionality to scroll to specific sections based on the location.hash during page load to enable bookmarking and other browser features.

Answer №2

Just recently, I found myself in a similar situation and while I can't guarantee this will solve your problem, it might steer you towards the right path.

 onclick="document.getElementById('c1:hover').style.cssText='backgroundPosition: -276px 0px;';"

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