how to use animation with ng-repeat in angularjs

Question

I have a list which I iterate over by using ng-repeat: and the user can interact with thte list items by using up-arrow and down-arrow icons and on click of them i simply change the order of the element in the "list" this is what angular suggests change the model and the changes automatically reflect in the view.

<div ng-repeat="item in list">
{{item.name}} 
<div class="icon-up-arrow" ng-click="moveUp($index);"></div> 
<div class="icon-down-arrow" ng-click="moveDown($index);"></div>
</div>

Logic in moveUp:-

$scope.moveUp= function(position){
 var temp=list[position-1];
 list[position-1]=list[position];
 list[position=temp];
};

the above code works completely fine and similar is the logic for shifting the item down. But the problem that i want to resolve is how do i put animation? I know angular takes care of binding view and model on its own but is there any way to put in animation as the view is updated on pressing up an down arrow icons?

Answer 1

Following on from Marcel's comment: in AngularJS 1.2 you don't need to use the ng-animate directive. Instead:

1. Includeangular-animate[-min].js.
2. Make your module depend on ngAnimate.
3. Define your transitions in CSS using classes like .ng-enter and .ng-enter-active.
4. Use ng-repeat as you normally would.

HTML:

<div ng-app="foo">
    <!-- Set up controllers etc, and then: -->
    <ul>
        <li ng-repeat="item in items">{{item}}</li>
    </ul>

JavaScript:

angular.module('foo', ['ngAnimate']);
// controllers not shown

CSS:

li {
    opacity: 1;
}
li.ng-enter {
    -webkit-transition: 1s;
    transition: 1s;
    opacity: 0;
}
li.ng-enter-active {
    opacity: 1;
}

Demo in (someone else's) Plunker.

See the docs for $animate for details on the progression through the various CSS classes.

Answer 2

Check this link http://www.nganimate.org/

1. You need to declare the ng-animate attribute to an element that have another directive that changes the DOM

   div ng-repeat="item in itens" ng-animate="{enter: 'animate-enter', leave: 'animate-leave'}"
   

2. You need to add css transitions or animation.

   .animate-enter {
      -webkit-transition: 1s linear all; /* Chrome */
      transition: 1s linear all;
      opacity: 0;
   }
   .animate-enter.animate-enter-active {
      opacity: 1;
   }
   

You can check plnkr example here: http://plnkr.co/edit/VfWsyg9d7xROoiW9HHRM

Answer 3

Complementing the last answer, there is the ng-move class for animations when order is changed:

li {
    opacity: 1;
}
li.ng-move {
    -webkit-transition: 1s;
    transition: 1s;
    opacity: 0;
}
li.ng-move-active {
    opacity: 1;
}

Last documentation here.

Answer 4

If you don’t wish to use ‘ngAnimate’ module because of reduce the plugins count, you can archive the simple transition effect by using ng-init and custom directives.

<li ng-repeat="item in items" class="item" item-init>{{item.name}}</li>

.item{
    opacity:0;

   -webkit-transition: all linear 300ms;
   transition: all linear 300ms;
}
.item.visible{
    opacity:1;
}


myApp.directive('itemInit', function ($compile) {
    return function (scope, element, attrs) {
        scope.initItem(element);
    };
});

In you controller

$scope.initItem = function(el){
    $timeout(function(){
        angular.element(el).addClass('visible');
    },0);
}