css3 transform reverts position: fixed

问题

When using a css3 transform(), position: fixed does not apply. I made a fully working jsFiddle showing the issue: http://jsfiddle.net/SR5ka/

First scroll down, notice the left-hand sidebar stays fixed. Now, click expand, and scroll down, notice the left-hand sidebar is now not fixed.

Any idea if there is a native css fix for this?

回答1:

You could use a work around like this one. It involves toggling a left value (via a class) for both the fixed element and the container.

.global-wrapper {
    position: relative;
    -webkit-transition: 300ms;
    transition: 300ms;
}
.global-wrapper.expanded,
.global-wrapper.expanded .navbar {
    left: 200px;
}
.navbar {
    -webkit-transition: 300ms;
    transition: 300ms;
    position: fixed;
    width: 100px;
    height: 100%;
    top: 0px;
    left: 0px;
}
.content {
    position: relative;
    width: calc(100% - 170px); /* 100% - width of left bar plus margin */
}

With a small amount of vanilla JS to toggle it the class:

var wrapper = document.querySelector(".global-wrapper");
document.getElementById("expand").onclick = function() {
        wrapper.classList.toggle("expanded");
}

回答2:

According to this answer: https://stackoverflow.com/a/15251226/125264 This issue can be fixed by adding dummy -webkit-transform to the element which needs to be fixed. Worked for me.

Edit 04.2016

Looks like does not work anymore.

来源：https://stackoverflow.com/questions/19059662/css3-transform-reverts-position-fixed