I am trying to call $filter using a filter expression via a filter string I've stored as metadata. For instance my filter string might look like this:
var filterForMyValue = "number : 2 | someOtherFilter";
This would be no problem I was invoking a similar hardcoded filter via markup:
<span>{{ somevalue | number : 2 | someOtherFilter</span>
However I want to programmatically apply this filter. Doing something like this $filter(myFilterString)(valueToFilter) doesn't work since you can't include the filter parameters or multiple chained filters as a single string. It will only allow you to pass the filter name and then the parameters must be passed separately which I don't want since this is a generic method that needs to apply any filter string to a value. I thought $parse might be of some use but I was unable to find any examples of how it might be combined with $filter to achieve this.
This is in the lines of bluetoft comment, maybe one step closer using parser service instead of compile.
http://plnkr.co/edit/ZyFZ42XAuuE4tRZbxKqn?p=preview
$scope.item = 1.123;
//Option 1
var filterFn = $parse('item |number:2|myFilter');
console.log(filterFn($scope));
//Option 2
$scope.item = $filter('number')($scope.item, 2);
$scope.item = $filter('myFilter')($scope.item);
console.log($scope.item);
There are 2 options. Option1 uses parser and option may be you can create custom filter chain service (this is what internally the parser service would do but this is more in terms of your expected pattern of passing input/filters).