-webkit-transform: using position:absolute

问题

I have a series of divs that slide down using -webkit-transform from a negative margin-top to a position on the screen. Problem is that they end up where they would normally be sitting if there was no negetive margin-top applied to them.

This means if I show the 2nd div it has an empty space the size of the first div above it. To solve this I can apply a negative margin-top to the 2nd div, but I think thats messy.

My main concern is that if the height of dropdiv1 changes then I would have to reset the values on the click functions to have the other divs line up correctly again when shown.

Is there a way to amend -webkit-transform to incorporate postion:absolute?

My current code is:

CSS:

#dropdiv1 {
    -webkit-transform: translate(0, -3000px);
    -webkit-transition: all ease-in 1s;
}

#dropdiv2 {
    -webkit-transform: translate(0, -3400px);
    -webkit-transition: all ease-in 1s;
}

#dropdiv3 {
    -webkit-transform: translate(0, -4200px);
    -webkit-transition: all ease-in 1s;
}

JQuery:

$('#clickme1').click(
                      function() {
                      $('#dropdiv1').css('-webkit-transform','translate(0, -335px)');
                      });

  $('#clickme2').click(
                        function() {
                        $('#dropdiv2').css('-webkit-transform','translate(0, -2335px)');
                        });

  $('#clickme3').click(
                        function() {
                        $('#dropdiv3').css('-webkit-transform','translate(0, -3300px)');
                        });

HTML:

<ul class="mainmenu">
 <li><a id="clickme1" href="#">Click Me 1</a></li>
 <li><a id="clickme2" href="#">Click Me 2</a></li>     
 <li><a id="clickme3" href="#">Click Me 3</a></li>
</ul>

                <div class="showdata"  id="dropdiv1">
                    Lots of random text....
                </div>

                <div class="showdata"  id="dropdiv2">
                    Lots of random text....
                </div>

                <div class="showdata"  id="dropdiv3">
                   Lots of random text....
                </div>

回答1:

I don't really see any logical behavior for animating position: absolute.

This would be more easy to read:

#dropdiv1 {
    -webkit-transform: translate(0, -3000px);
    -webkit-transition: all ease-in 1s;
}
#dropdiv1.anim {
    -webkit-transform: translate(0, -335px);
}

#dropdiv2 {
    -webkit-transform: translate(0, -3400px);
    -webkit-transition: all ease-in 1s;
}
#dropdiv2.anim {
    -webkit-transform: translate(0, -2335px);
    -webkit-transition: all ease-in 1s;
}

#dropdiv3 {
    -webkit-transform: translate(0, -4200px);
    -webkit-transition: all ease-in 1s;
}
#dropdiv3.anim {
    -webkit-transform: translate(0, -3300px);
    -webkit-transition: all ease-in 1s;
}

Then add class instead.

$('#dropdiv3').addClass('anim');

That, or either run a .offset() before applying position: absolute and use that top and left for animation.

回答2:

OK I have found a kind of solution. Still messy but ok:

<div id="bigcontainer">
    <ul class="mainmenu">
     <li><a id="clickme1" href="#">Click Me 1</a></li>
                    <div class="showdata"  id="dropdiv1">
                        Lots of random text....
                </div>
 <li><a id="clickme2" href="#">Click Me 2</a></li>
                <div class="showdata"  id="dropdiv2">
                    Lots of random text....
                </div>     
 <li><a id="clickme3" href="#">Click Me 3</a></li>
                <div class="showdata"  id="dropdiv3">
                   Lots of random text....
                </div>
</ul>
</div>

CSS:

#bigcontainer {
height: 1500px;/*as big as the bigest dropdiv to enable scrolling*/
}    

#dropdiv1 {
    -webkit-transform: translate(0, -3000px);
    -webkit-transition: all ease-in 1s;
    z-index: 1;
    position: absolute;
}

#dropdiv2 {
    -webkit-transform: translate(0, -3400px);
    -webkit-transition: all ease-in 1s;
    z-index: 2;
    position: absolute;
}

#dropdiv3 {
    -webkit-transform: translate(0, -4200px);
    -webkit-transition: all ease-in 1s;
    z-index: 3;
    position: absolute;
}

Not particularly a fan but it will do!

来源：https://stackoverflow.com/questions/11202076/webkit-transform-using-positionabsolute