CODEWITHSUNDEEP
htmlcsshovertransform
Emiel Janson
Emiel Janson

Reputation: 43

Flickering div when using CSS transform on hover

I'm making a div on top of the tweet (and also the Facebook like) button. I want it to move up as soon as I hover above the div (button) so you can actually press the real tweet button. I've tried the following.

HTML:

<div class="tweet-bttn">Tweet</div>         
<div class="tweet-widget">
    <a href="https://twitter.com/share" class="twitter-share-button">Tweet</a>
    <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script>
</div>

CSS:

.tweet-bttn{
    position: relative;
    top: -30px;
    left: -10px;
    display:block;
    opacity: 1;
    width: 80px;
    padding: 10px 12px;
    margin:0px;
    z-index:3;}

.tweet-bttn:hover{
    -webkit-animation-name: UpTweet;
    -moz-animation-name: UpTweet;
    -o-animation-name: UpTweet;
    animation-name: UpTweet;
    -webkit-animation-duration:.5s;
    -moz-animation-duration:.5s;
    animation-duration:.5s;
    -webkit-transition: -webkit-transform 200ms ease-in-out;
    -moz-transition: -moz-transform 200ms ease-in-out;
    -o-transition: -o-transform 200ms ease-in-out;
    transition: transform 200ms ease-in-out;}

@-webkit-keyframes UpTweet {
    0% {
        -webkit-transform: translateY(0);
    }   
    80% {
        -webkit-transform: translateY(-55px);
    }
    90% {
        -webkit-transform: translateY(-47px);
    }
    100% {
        -webkit-transform: translateY(-50px);
    }
    ... and all other browser pre-fixes.
}

I'm not sure what's going wrong. It looks like that as soon as I hover, it moves, but if I move the cursor one more pixel, it has to do a new calculation which causes the flickering.

Upvotes: 4

Views: 3325

Answers (1)

Mr. Alien
Mr. Alien

Reputation: 157414

I don't know why you need animations for this when you can simply achieve the above using transitions

The trick is to move the child element on parent hover

Demo

div {
    margin: 100px;
    position: relative;
    border: 1px solid #aaa;
    height: 30px;
}

div span {
    position: absolute;
    left: 0;
    width: 100px;
    background: #fff;
    top: 0;
    -moz-transition: all 1s;
    -webkit-transition: all 1s;
    transition: all 1s;
}

div span:nth-of-type(1) {
/* Just to be sure the element stays above the 
   content to be revealed */
    z-index: 1;
}

div:hover span:nth-of-type(1) { /* Move span on parent hover */
    top: -40px;
}

Explanation: Firstly we wrap span's inside a div element which is position: relative; and later we use transition on span which will help us to smooth the flow of the animation, now we use position: absolute; with left: 0;, this will stack elements on one another, than we use z-index to make sure the first element overlays the second.

Now at last, we move the first span, we select that by using nth-of-type(1), which is nothing but first child of it's kind which is nested inside div, and we assign top: -40px; which will transit when the parent div is hovered.

Upvotes: 6

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