116

I’m trying to prevent the browser from using the :hover effect of the CSS, via JavaScript.

I have set the a and a:hover styles in my CSS, because I want a hover effect, if JS isn’t available. But if JS is available, I want to overwrite my CSS hover effect with a smoother one (using the jQuery color plugin for example.)

I tried this:

$("ul#mainFilter a").hover(
     function(e){ e.preventDefault(); ...do my stuff... }, 
     function(e){ e.preventDefault(); ...do my stuff... });

I also tried it with return false;, but it does not work.

Here is an example of my problem: http://jsfiddle.net/4rEzz/. The link should just fade without getting gray.

As mentioned by fudgey, a workaround would be to reset the hover styles using .css() but I would have to overwrite every single property, specified in the CSS (see here: http://jsfiddle.net/raPeX/1/ ). I am looking for a generic solution.

Does anyone know how to do this?

PS: I do not want to overwrite every style i have set for the hover.

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11 Answers 11

Reset to default
144
+150

There isn’t a pure JavaScript generic solution, I’m afraid. JavaScript isn’t able to turn off the CSS :hover state itself.

You could try the following alternative workaround though. If you don’t mind mucking about in your HTML and CSS a little bit, it saves you having to reset every CSS property manually via JavaScript.

HTML

<body class="nojQuery">

CSS

/* Limit the hover styles in your CSS so that they only apply when the nojQuery 
class is present */

body.nojQuery ul#mainFilter a:hover {
    /* CSS-only hover styles go here */
}

JavaScript

// When jQuery kicks in, remove the nojQuery class from the <body> element, thus
// making the CSS hover styles disappear.

$(function(){}
    $('body').removeClass('nojQuery');
)
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8 Comments

I like this solution better than the noscript solutions because this works when the CSS is entirely contained in external files, and it also works during page load, if the CSS loads first but the JS doesn't load until later. Using jQuery to "progressively enhance" things often results in pages that don't work well if you click on stuff before it's finished loading. Even with a fast browser on a fast link I see this a lot.
@Mr. Shiny and New: I agree, I like this better than my solution also! I'm not sure why I didn't notice the elegance of this one before...
“I like this solution better than the noscript solutions because this works when the CSS is entirely contained in external files” — so does the <noscript> solution. You just put <link> tags inside your <noscript>, instead of <style> tags. My solution does allow you to keep everything inside one stylesheet file rather than multiple files though.
its not exactly what i was looking for but i think this solution is the best compromise! Thx to all of you
you can also copy the same style with a different name and using jquery select all the elements with that class and remove the class and replace with the copy class.
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21

Use a second class that has only the hover assigned:

HTML

 <a class="myclass myclass_hover" href="#">My anchor</a>

CSS

 .myclass { 
   /* all anchor styles */
 }
 .myclass_hover:hover {
   /* example color */
   color:#00A;
 }

Now you can use Jquery to remove the class, for instance if the element has been clicked:

JQUERY

 $('.myclass').click( function(e) {
    e.preventDefault();
    $(this).removeClass('myclass_hover');
 });

Hope this answer is helpful.

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Comments

12

You can manipulate the stylesheets and stylesheet rules themselves with javascript

var sheetCount = document.styleSheets.length;
var lastSheet = document.styleSheets[sheetCount-1];
var ruleCount;
if (lastSheet.cssRules) { // Firefox uses 'cssRules'
    ruleCount = lastSheet.cssRules.length;
}
else if (lastSheet.rules) { / /IE uses 'rules'
    ruleCount = lastSheet.rules.length;
}
var newRule = "a:hover { text-decoration: none !important; color: #000 !important; }";
// insert as the last rule in the last sheet so it
// overrides (not overwrites) previous definitions
lastSheet.insertRule(newRule, ruleCount);

Making the attributes !important and making this the very last CSS definition should override any previous definition, unless one is more specifically targeted. You may have to insert more rules in that case.

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5 Comments

Or you could put all the noscript rules in one stylesheet and then disable the stylesheet from javascript.
Or put your noscript stylesheet <link> tag inside a <noscript> element? That’d work, right?
Or delete the "offending" rule: developer.mozilla.org/en/DOM/stylesheet.deleteRule
Even IE5 can do it. It's method is called differently, but it should work: msdn.microsoft.com/en-us/library/ms531195%28v=vs.85%29.aspx . I haven't checked other browsers, but I would guess all modern browsers implement the standard.
In Firefox I get Error: The operation is insecure.
11

This is similar to aSeptik's answer, but what about this approach? Wrap the CSS code which you want to disable using JavaScript in <noscript> tags. That way if javaScript is off, the CSS :hover will be used, otherwise the JavaScript effect will be used.

Example:

<noscript>
<style type="text/css">
ul#mainFilter a:hover {
  /* some CSS attributes here */
}
</style>
</noscript>
<script type="text/javascript">
$("ul#mainFilter a").hover(
     function(o){ /* ...do your stuff... */ }, 
     function(o){ /* ...do your stuff... */ });
</script>
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Comments

6

I used the not() CSS operator and jQuery's addClass() function. Here is an example, when you click on a list item, it won't hover anymore:

For example:

HTML

<ul class="vegies">
    <li>Onion</li>
    <li>Potato</li>
    <li>Lettuce</li>
<ul>

CSS

.vegies li:not(.no-hover):hover { color: blue; }

jQuery

$('.vegies li').click( function(){
    $(this).addClass('no-hover');
});
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Comments

4

I'd recommend to replace all :hover properties to :active when you detect that device supports touch. Just call this function when you do so as touch().

function touch() {
  if ('ontouchstart' in document.documentElement) {
    for (var sheetI = document.styleSheets.length - 1; sheetI >= 0; sheetI--) {
      var sheet = document.styleSheets[sheetI];
      if (sheet.cssRules) {
        for (var ruleI = sheet.cssRules.length - 1; ruleI >= 0; ruleI--) {
          var rule = sheet.cssRules[ruleI];

          if (rule.selectorText) {
            rule.selectorText = rule.selectorText.replace(':hover', ':active');
          }
        }
      }
    }
  }
}
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Comments

3

I would use CSS to prevent the :hover event from changing the appearance of the link.

a{
  font:normal 12px/15px arial,verdana,sans-serif;
  color:#000;
  text-decoration:none;
}

This simple CSS means that the links will always be black and not underlined. I cannot tell from the question whether the change in the appearance is the only thing you want to control.

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2 Comments

its good that there is a :hover effect if JS is not avalible on a client. But if it is i need to overwrite it. I have set a:hover class in my css, is just want to disable it.
@meo: You can't disable the CSS psuedo classes, but you can override it by setting all the link styles to have the same appearance/parameters. Both this answer and my answer do this, just in different ways.
1

Try just setting the link color:

$("ul#mainFilter a").css('color','#000');

Edit: or better yet, use the CSS, as Christopher suggested

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5 Comments

jsfiddle.net/raPeX i have made an example. It works but its kind of stupid to do that. i would have to retrieve every CSS value and add them as style? There must be a better way. I don't want to do that. but +1 for the hint
Hi Meo, no no, my code above was targeting a specific link as that is what I thought you wanted. You could generalize it more by just using a instead of ul#mainFilter a if that is what you mean, or are you saying every link on the page is a different color?
I've updated your demo, with comments, to show you what I mean: jsfiddle.net/raPeX/2
ive got that already thank you. But the problem is, there is not just the color changing on my hover, sometimes its the background to, the border, sometimes even the line-height. Thats why it would be easier for me to just prevent the hover, den to overwrite every single hover effect.
Partial patch for this idea: You could create css a rule that selects for a.jsOverride:hover that overrides all of the css characteristics, so the js would just have to add that jsOverride class to all the links when the page loads...
1

Actually an other way to solve this could be, overwriting the CSS with insertRule.

It gives the ability to inject CSS rules to an existing/new stylesheet. In my concrete example it would look like this:

//creates a new `style` element in the document
var sheet = (function(){
  var style = document.createElement("style");
  // WebKit hack :(
  style.appendChild(document.createTextNode(""));
  // Add the <style> element to the page
  document.head.appendChild(style);
  return style.sheet;
})();

//add the actual rules to it
sheet.insertRule(
 "ul#mainFilter a:hover { color: #0000EE }" , 0
);

Demo with my 4 years old original example: http://jsfiddle.net/raPeX/21/

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Comments

0

The most simple solution:

  • add a seperate class that overrides :hover pseudo-class

  • remove that class on mouseout event

HTML

<a id="hello">hello</a>

CSS

#hello:hover {
    color: red;
}

#hello.unhover {
    color: green !important;
}

jQuery

$("#hello").mouseout(function() {
    $(this).removeClass("unhover");
});

function myJSAction () {
    $("#hello").addClass("unhover");
}

  • the :hover pseudo-class will not be affected

  • you can call myJSAction() whenever :hover has to be ignored

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Comments

-1

This can be realized by pure javascript easily; Try the code below:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    :root {
        --orange-color: #fa8e3f;
        --dark-organge-color: #bd5305;
        --light-color: #fff;
        --dark-color: #000;
        --grey-color: #f2f2f2;
        --transition: all 300ms ease-in-out;
    }
    .quiz-options {
        list-style-type: none;
        margin: 1rem 0;
    }

    .quiz-options li {
        color: var(--light-color);
        background-color: var(--orange-color);
        font-weight: 600;
        border: 3px solid var(--orange-color);
        border-radius: .5rem;
        margin: .7rem 0;
        padding: .4rem 1.2rem;
        box-shadow: 0 4px 0 0 var(--dark-organge-color);
        transition: var(--transition);
    }

    .quiz-options li.enable-hover-active {
        cursor: pointer;
    }

    .quiz-options li.enable-hover-active:hover {
        background-color: var(--grey-color);
        color:var(--dark-color);
        border-color: var(--grey-color);
        box-shadow: 0 4px 0 0 #bbb;
    }

    .quiz-options li.enable-hover-active:active {
        transform: scale(0.97);
    }

    button {
        border: none;
        border-radius: 0.5rem;
        outline: 0;
        font-family: 'Poppins', sans-serif;
        font-size: 1.2rem;
        font-weight: 600;
        padding: .5rem 1rem;
        margin: 0 auto;
        text-transform: uppercase;
        cursor: pointer;
        display: block;
        background-color: var(--grey-color);
        color: var(--dark-color);
        letter-spacing: 2px;
        transition: var(--transition);
        box-shadow: 0 4px 0 0 #bbb;
    }
</style>
<body>
    <ul class="quiz-options">
        <li>option 1</li>
        <li>option 2</li>
        <li>option 3</li>
        <li>option 4</li>
    </ul>
    <button type="button" id="check-answer" onclick="enableHoverActive()">Enable hover & active</button>
    
    <script>
        function enableHoverActive() {
            if (document.getElementById('check-answer').textContent == 'Enable hover & active') {
                document.getElementById('check-answer').textContent = 'Disable hover & active';
                document.querySelectorAll('li').forEach((option) => {
                    option.classList.add('enable-hover-active');
                });
            } else {
                document.getElementById('check-answer').textContent = 'Enable hover & active';
                document.querySelectorAll('li').forEach((option) => {
                    option.classList.remove('enable-hover-active');
                });
            }
        }
    </script>
</body>
</html>

The result is as below:

  • when "disabled", hover and click options enter image description here

  • when "enabled", hover and click options enter image description here

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