The following code shows how to filter input from value attribute.
<!doctype html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.2/angular.js"></script>
<script type='text/javascript'>
function Ctrl($scope) {<!-- w w w . j a v a2 s . c o m-->
$scope.val = 1234.56789;
}
</script>
</head>
<body>
<div ng-app="">
<div ng-controller="Ctrl">
WANTS: {{val | number:2}} in "input" element<br>
2 decimal in input: <input ng-model='val'> <br>
2 decimal in input: <input type="number" step="0.01" ng-model='val'><br>
2 decimal in input: <input ng-model='val' value="{{val |number:2}}"> <br>
</div>
</div>
</body>
</html>
The code above is rendered as follows: