How to delay ngAnimate in ngRepeat

问题:

When using ngAnimate to fade in each item in ngRepeat, currently all items fade in at the same time. Is it possible for each item to fade in after the previous item has faded to e.g. 50% resulting in a cascading effect?

<ul>
   <li ng-repeat="phone in phones" ng-animate="{enter: 'phone-fade-enter'}">
     <img src="{{phone.img}}"> {{phone.name}}
   </li>
</ul>

Using ngAnimate it would be nice if it would be possible to delay the animation of each item e.g. like this:

<li ng-repeat="phone in phones" ng-animate="{enter: 'phone-enter', delay: 500}">

Is there a way to solve this?

Thanks!

Added to GitHub https://github.com/angular/angular.js/issues/2460

回答1:

This is now supported natively with 1.2: https://docs.angularjs.org/api/ngAnimate#css-staggering-animations

To make use of it, use the ng-enter-stagger selector in your CSS, like so:

css:

.animated.ng-enter-stagger {
  transition-delay: 0.3s;
  animation-delay: 0.3s;
}

sass (if in use):

=stagger($delay)
  &-stagger
    transition-delay: $delay
    animation-delay: $delay

.animated
  &.ng-enter
    +stagger(0.3s)

回答2:

You can get this effect by setting the transition-delay style on the repeated element. (Requires v1.1.5)

<li ng-repeat="phone in phones" ng-animate="{enter: 'phone-enter'}" style="transition-delay: {{$index * 500}}ms">

You'll have to set your transition properties separately in your CSS, otherwise the inline style will overwrite the entire transition:

.phone-enter {
  opacity:0;
  -webkit-transition-property: all;
  -webkit-transition-timing-function: ease-out-cubic;
  -webkit-transition-duration: 400ms;
}
.phone-enter.phone-enter-active {
  opacity: 1;
}

Here is a fork of the example created by heyotwell.