Difficulty encountered when attempting to implement custom filtering based on condition in HTML using Angular

Question

Difficulty encountered when attempting to implement custom filtering based on condition in HTML using Angular

I'm still new to angular, so please bear with me if this question seems trivial. I have a collection of integers in my controller and I need to filter it to only show items that meet a certain condition.

Initially, I attempted the following:

<div>{{myCollection.find(item => item === 2)}}</div>

but unfortunately, it did not work as expected. I then tried a different approach (which I'm not too fond of because I will always have just one element to display):

<div ng-repeat="item in list | filter:{item === 2}">
    <div>{{item}}</div>
</div>

However, this method also failed to produce the desired outcome. You can view my attempts on JSBin here: http://jsbin.com/govovocace/1/edit?html,js,output

Does anyone have a solution to my problem? I would prefer to avoid calculating the required field in the controller and passing it to the view (if possible).

javascript angularjs angularjs-ng-repeat angularjs-filter

Answer 1

Answer №1

You made a syntax error. When using the filter function, do not mention any object within it as you are already filtering the object being looped on directly. The last parameter true is used to perform an exact match check.

HTML

<div ng-repeat="item in list | filter: 2: true">
    <div>{{item}}</div>
</div>

View Demo Plunkr

Answer 2

You made a syntax error. When using the filter function, do not mention any object within it as you are already filtering the object being looped on directly. The last parameter true is used to perform an exact match check.

HTML

<div ng-repeat="item in list | filter: 2: true">
    <div>{{item}}</div>
</div>

View Demo Plunkr

Answer 3

Answer №2

If you want to create a filter function in your controller, you can do so by following these steps:

$scope.filterFn = function(value){
    return value === 2;
};

After defining the filter function, you can then implement it in your template like this:

<div ng-repeat="item in list | filter:filterFn">
    <div>{{item}}</div>
</div>

However, keep in mind that using a filter function may be redundant as you can simply filter the array directly. If you have a specific scenario where this approach does not work for you, feel free to share it in the comments.

Answer 4

If you want to create a filter function in your controller, you can do so by following these steps:

$scope.filterFn = function(value){
    return value === 2;
};

After defining the filter function, you can then implement it in your template like this:

<div ng-repeat="item in list | filter:filterFn">
    <div>{{item}}</div>
</div>

However, keep in mind that using a filter function may be redundant as you can simply filter the array directly. If you have a specific scenario where this approach does not work for you, feel free to share it in the comments.

Answer 5

Answer №3

Here is an example of how I would approach this:

.controller('SomeController',function($scope){

 // Retrieve the list from a data source
  $scope.list  = [] // This could be an array fetched from an API, for instance

  $scope.dataList = list.filter(function(item){
     return item.someVal == list.someVal; // Specify your desired condition here
  });

});

You can then utilize this in the view like so:

<div ng-repeat="item in dataList"> 
   {{item}}
</div>

If your condition only returns one result, you can simplify it to:

$scope.dataList = list.filter(function(item){
         return item.someVal == list.someVal; // Condition that meets your requirements
      })[0];

Answer 6

Here is an example of how I would approach this:

.controller('SomeController',function($scope){

 // Retrieve the list from a data source
  $scope.list  = [] // This could be an array fetched from an API, for instance

  $scope.dataList = list.filter(function(item){
     return item.someVal == list.someVal; // Specify your desired condition here
  });

});

You can then utilize this in the view like so:

<div ng-repeat="item in dataList"> 
   {{item}}
</div>

If your condition only returns one result, you can simplify it to:

$scope.dataList = list.filter(function(item){
         return item.someVal == list.someVal; // Condition that meets your requirements
      })[0];

Difficulty encountered when attempting to implement custom filtering based on condition in HTML using Angular

Answer №1

Answer №2

Answer №3

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