Learn the process of transforming a filter into a directive in AngularJS

Here is a question I asked previously, where I was looking to remove negative numbers from an input field:

<input type = "text" ng-model="number"></input>

In that previous question, Paritosh provided me with a helpful solution, but now I am interested in converting that code from a filter to a directive. How can I go about turning it into a directive?

app.filter('nonNegative', function(){
  return function(val){
     if(val >= 0) return val; else '';
  }
})

Answer №1

Make sure to add ngmodel in your directive

app.directive('myDirective', function(){
return{ 
    restrict: 'A',
    require: 'ngModel',
    link: function(scope, element, attrs,ngModel){
       // Implement your filtering logic here
       if(scope.number < 0)
         scope.number = 0;
    }
}
});

This functionality is triggered upon initial loading of the element

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