angularjs,checkbox,filter,conditional,ng-repeat , Is it possible to turn a filter on and off conditionally in AngularJS?


Is it possible to turn a filter on and off conditionally in AngularJS?

Question:

Tag: angularjs,checkbox,filter,conditional,ng-repeat

For example I have a table in which I am showing students marks of Math, Science, English and other subjects. And I have a checkbox which if checked will only list the students that have {{student.mathMarks + student.scienceMarks > 150}} (i.e. sum of student's math and science marks to be more than 150). And when the checkbox is unchecked it will again show all the students. Is there a way I could associate a conditional filter with the given students with ng-repeat to achieve this?

Following is the code relating to the case I tried explaining above:

<tr ng-repeat="student in students">
    <td >
        {{student.name}}
    </td>
    <td >
       {{student.mathMarks}}
    </td>
    <td >
       {{student.scienceMarks}}
    </td>
     <td >
       {{student.englishMarks}}
    </td>
</tr>

<input type="checkbox" ng-model="onlyFooStudents" />

Answer:

You can pass a function as the expression for you filter. So in that case all you got to do is to declare a function in your scope that checks for the flag, something like:

$scope.yourCustomFilter = function(student) {
    // if flag is false, bring everybody. if not, bring only the ones that match.
    return $scope.onlyFooStudents || 
      student && student.mathMarks + student.scienceMarks > 150;
};

And in your binding you will have ng-repeat="student in student | filter:yourCustomFilter".

Another way to implement it in case you're using the same filter somewhere else, is to create a custom filter and you can than pass in parameters, something in these lines:

angular.module('appFilters', []).filter('filterStudents', function() {
   function isApproved(student) {
       return student && student.mathMarks + student.scienceMarks > 150;
   }

   return function(students, showApprovedOnly) {
     // if it is to bring everybody, we just return the original array,
     // if not, we go on and filter the students in the same way.
     return !showApprovedOnly ? students : students.filter(isApproved);

     // COMPATIBLITY: please notice that Array.prototype.filter is only available IE9+.
   };
})

Your binding you then be ng-repeat="student in students | studentFilter:onlyFooStudents". Notice that we pass in the onlyFooStudents as an argument to your filter, bound directly from the scope.


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