<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.0/angular.js"></script>
<meta charset="utf-8">
<title>Basic animate on model change</title>
<style>
[animate-model-change]{
transition: 0.3s color ease;
}
.up{
color:green;
}
.down{
color:red;
}
</style>
</head>
<body ng-app="app" ng-controller="Ctrl">
<span animate-model-change model="{{someModel}}">{{someModel}}</span>
<footer>
<button ng-click="updateModel(1)">+</button>
<button ng-click="updateModel(-1)">-</button>
</footer>
</body>
</html>
angular.module('app', [])
.controller('Ctrl', ctrl)
.directive('animateModelChange', animateModelChange);
function ctrl($scope){
$scope.someModel = 0;
$scope.updateModel = function updateModel(val){
$scope.someModel += val;
};
}
function animateModelChange($timeout){
function animateModelChangeLink(scope, element, attrs){
var timer = null,
incrementClass = 'up',
decrementClass = 'down';
function modelChanged(newVal, oldVal){
var changeClass = null;
// Clear previous timeout.
if(timer){
$timeout.cancel(timer);
timer = null;
}
if(newVal && newVal !== oldVal && angular.isNumber(Number(newVal)) && !isNaN(Number(newVal))){
if(Number(newVal) < Number(oldVal)){
changeClass = decrementClass;
} else {
changeClass = incrementClass;
}
}
element.addClass(changeClass);
timer = $timeout(function removeClasses(){
element.removeClass(incrementClass);
element.removeClass(decrementClass);
}, 300);
}
scope.$watch(function(){ return attrs.model; }, modelChanged);
}
return {
restrict: 'A',
link: animateModelChangeLink
};
}
Output
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