CSS Animation and Display None

问题

I have a CSS Animation for a div that slides in after a set amount of time. What I would like is for a few divs to fill the space of the animated div that slides in, which it will then push those elements down the page.

When I attempt this at first div that slides in still takes up space even when it is not visible. If I change the div to display:none the div doesn\'t slide in at all.

How do I have a div not take up space until it is timed to come in (using CSS for the timing.)

I am using Animate.css for the animations.

Here is what the code looks like:

<div id=\"main-div\" class=\"animated fadeInDownBig\"><!-- Content --></div>

<div id=\"div1\"><!-- Content --></div>
<div id=\"div2\"><!-- Content --></div>
<div id=\"div3\"><!-- Content --></div>

As the code shows I would like the main div to be hidden and the other divs show at first. Then I have the following delay set:

#main-div{
   -moz-animation-delay: 3.5s;
   -webkit-animation-delay: 3.5s;
   -o-animation-delay: 3.5s;
    animation-delay: 3.5s;
}

It is at that point that I would like the main div to push the other divs down as it comes in.

How do I do this?

Note: I have considered using jQuery to do this, however I prefer using strictly CSS as it is smoother and the timing is a bit better controlled.

EDIT

I have attempted what Duopixel suggested but either I mis-understood and am not doing this correctly or it doesn\'t work. Here is the code:

HTML

<div id=\"main-div\" class=\"animated fadeInDownBig\"><!-- Content --></div>

CSS

#main-image{
    height: 0;
    overflow: hidden;
   -moz-animation-delay: 3.5s;
   -webkit-animation-delay: 3.5s;
   -o-animation-delay: 3.5s;
    animation-delay: 3.5s;
}
#main-image.fadeInDownBig{
    height: 375px;
}

回答1:

CSS (or jQuery, for that matter) can't animate between display: none; and display: block;. Worse yet: it can't animate between height: 0 and height: auto. So you need to hard code the height (if you can't hard code the values then you need to use javascript, but this is an entirely different question);

#main-image{
    height: 0;
    overflow: hidden;
    background: red;
   -prefix-animation: slide 1s ease 3.5s forwards;
}

@-prefix-keyframes slide {
  from {height: 0;}
  to {height: 300px;}
}

You mention that you're using Animate.css, which I'm not familiar with, so this is a vanilla CSS.

You can see a demo here: http://jsfiddle.net/duopixel/qD5XX/

回答2:

There are a few answers already, but here is my solution:

I use opacity: 0 and visibility: hidden. To make sure that visibility is set before the animation, we have to set the right delays.

I use http://lesshat.com to simplify the demo, for use without this just add the browser prefixes.

(e.g. -webkit-transition-duration: 0, 200ms;)

.fadeInOut {
    .transition-duration(0, 200ms);
    .transition-property(visibility, opacity);
    .transition-delay(0);

    &.hidden {
        visibility: hidden;
        .opacity(0);
        .transition-duration(200ms, 0);
        .transition-property(opacity, visibility);
        .transition-delay(0, 200ms);
    }
}

So as soon as you add the class hidden to your element, it will fade out.

回答3:

I had the same problem, because as soon as display: x; is in animation, it won't animate.

I ended up in creating custom keyframes, first changing the display value then the other values. May give a better solution.

Or, instead of using display: none; use position: absolute; visibility: hidden; It should work.

回答4:

You can manage to have a pure CSS implementation with max-height

#main-image{
    max-height: 0;
    overflow: hidden;
    background: red;
   -prefix-animation: slide 1s ease 3.5s forwards;
}

@keyframes slide {
  from {max-height: 0;}
  to {max-height: 500px;}
}

You might have to also set padding, margin and border to 0, or simply padding-top, padding-bottom, margin-top and margin-bottom.

I updated the demo of Duopixel here : http://jsfiddle.net/qD5XX/231/

回答5:

The following will get you to animate an element when

Giving it a Display - None
Giving it a Display - Block

CSS

.MyClass {
       opacity: 0;
       display:none;
       transition: opacity 0.5s linear;
       -webkit-transition: opacity 0.5s linear;
       -moz-transition: opacity 0.5s linear;
       -o-transition: opacity 0.5s linear;
       -ms-transition: opacity 0.5s linear;
 }

JavaScript

function GetThisHidden(){
    $(".MyClass").css("opacity", "0").on('transitionend webkitTransitionEnd oTransitionEnd otransitionend', HideTheElementAfterAnimation);
}

function GetThisDisplayed(){
    $(".MyClass").css("display", "block").css("opacity", "1").unbind("transitionend webkitTransitionEnd oTransitionEnd otransitionend");
}

function HideTheElementAfterAnimation(){
    $(".MyClass").css("display", "none");
}

回答6:

When animating height (from 0 to auto), using transform: scaleY(0); is another useful approach to hide the element, instead of display: none;:

.section {
  overflow: hidden;
  transition: transform 0.3s ease-out;
  height: auto;
  transform: scaleY(1);
  transform-origin: top;

  &.hidden {
    transform: scaleY(0);
  }
}

回答7:

How do I have a div not take up space until it is timed to come in (using CSS for the timing.)

Here is my solution to the same problem.

Moreover I have an onclick on the last frame loading another slideshow, and it must not be clickable until the last frame is visible.

Basically my solution is to keep the div 1 pixel high using a scale(0.001), zooming it when I need it. If you don't like the zoom effect you can restore the opacity to 1 after zooming the slide.

#Slide_TheEnd {

    -webkit-animation-delay: 240s;
    animation-delay: 240s;

    -moz-animation-timing-function: linear;
    -webkit-animation-timing-function: linear;
    animation-timing-function: linear;

    -moz-animation-duration: 20s;
    -webkit-animation-duration: 20s;
    animation-duration: 20s;

    -moz-animation-name: Slide_TheEnd;
    -webkit-animation-name: Slide_TheEnd;
    animation-name: Slide_TheEnd;

    -moz-animation-iteration-count: 1;
    -webkit-animation-iteration-count: 1;
    animation-iteration-count: 1;

    -moz-animation-direction: normal;
    -webkit-animation-direction: normal;
    animation-direction: normal;

    -moz-animation-fill-mode: forwards;
    -webkit-animation-fill-mode: forwards;
    animation-fill-mode: forwards;

    transform: scale(0.001);
    background: #cf0;
    text-align: center;
    font-size: 10vh;
    opacity: 0;
}

@-moz-keyframes Slide_TheEnd {
    0% { opacity: 0;  transform: scale(0.001); }
    10% { opacity: 1; transform: scale(1); }
    95% { opacity: 1; transform: scale(1); }
    100% { opacity: 0;  transform: scale(0.001); }
}

Other keyframes are removed for the sake of bytes. Please disregard the odd coding, it is made by a php script picking values from an array and str_replacing a template: I'm too lazy to retype everything for every proprietary prefix on a 100+ divs slideshow.

来源：https://stackoverflow.com/questions/13037637/css-animation-and-display-none

标签

css

css-transitions

animate.css