Is there a way to selectively include a filter in ng-repeat within a directive?

Question

Is there a way to selectively include a filter in ng-repeat within a directive?

Utilizing an element directive across multiple views, the directive iterates through each 'resource' in a list of resources using

ng-repeat="resource in resources"

.

Different page controllers determine which resources are fetched from the API by having a unique $scope.resourceApiPath in each view controller. The directive controller then uses this path to make an $http call.

This setup works effectively for displaying different types of resources on different views - such as the user's own resources, public resources, and starred resources.

The challenge arises when I want to include a filter on the ng-repeat in one specific view:

ng-repeat="resource in resources | filter:resourceSearch.text"

. Is it possible to conditionally add this filter based on a variable like $scope.filter == true;, otherwise default to

ng-repeat="resource in resources"

?

Here is my directive:

.directive('resourcePanel', function() {
    return {
        restrict: 'E',
        scope: false,
        templateUrl: 'scripts/templates/resource-panel.html',
        controller: 'ResourcesPanelController'
    }
})

The ResourcesPanelController referenced in the directive includes code similar to this:

$scope.resources = [];
$scope.loadResources = function() {
    $scope.resources = []; // Clear array
    $http.get('/api/resource' + $scope.resourceApiPath)
        .then(function(res) {
            $scope.resources = res.data.message;
        });
};
$scope.loadResources();

The template

scripts/templates/resource-panel.html

looks something like this:

<div class="panel" ng-repeat="resource in resources">
    {{resource.content}}
</div>

Thank you!

javascript angularjs angularjs-directive angular-controller

Answer 1

Answer №1

There are multiple ways to approach this issue, but I personally recommend options 1 and 3. The best choice for you will depend on your specific requirements and coding standards.

A custom filter is also a great solution to consider.

If you are using text values for filtering, not setting the value of resourceSearch.text essentially means no filter. If resourceSearch.text exists, it will apply the filter; if it's undefined, there will be no filter applied.

ng-repeat="resource in resources | filter:resourceSearch.text"
You can create a custom filter and manage the functionality there.

If you decide to go with a custom filter, make sure to utilize an enable argument that allows you to toggle the filter on and off. Here is a helpful example using Plunker: http://plnkr.co/edit/ilPJPUZkBC7Y5OvGHWey?p=preview. This Plunker features a custom filter that may meet your needs.

ng-repeat="resource in resources | customfilter:resourceSearch.text:enable"

You can filter your final resources within the controller and then pass the filtered results to the HTML template.
Another option is to use ng-if based on your condition - utilizing one loop if the filter exists and another loop if it does not.

I hope this information proves useful for you!

Answer 2

There are multiple ways to approach this issue, but I personally recommend options 1 and 3. The best choice for you will depend on your specific requirements and coding standards.

A custom filter is also a great solution to consider.

If you are using text values for filtering, not setting the value of resourceSearch.text essentially means no filter. If resourceSearch.text exists, it will apply the filter; if it's undefined, there will be no filter applied.

ng-repeat="resource in resources | filter:resourceSearch.text"
You can create a custom filter and manage the functionality there.

If you decide to go with a custom filter, make sure to utilize an enable argument that allows you to toggle the filter on and off. Here is a helpful example using Plunker: http://plnkr.co/edit/ilPJPUZkBC7Y5OvGHWey?p=preview. This Plunker features a custom filter that may meet your needs.

ng-repeat="resource in resources | customfilter:resourceSearch.text:enable"

You can filter your final resources within the controller and then pass the filtered results to the HTML template.
Another option is to use ng-if based on your condition - utilizing one loop if the filter exists and another loop if it does not.

I hope this information proves useful for you!

Answer 3

Answer №2

To implement a personalized filtering function, you can create the following:

$scope.customizedFilter = function(item) {
    if (!$scope.filterCriteria) {
        return true;
    }

    // Insert your specific filter conditions here
    return item.description.indexOf($scope.searchText) >= 0;
};

Next, utilize this custom filter in your template:

<div class="panel" ng-repeat="item in items | filter:customizedFilter">
    {{item.description}}
</div>

Answer 4

To implement a personalized filtering function, you can create the following:

$scope.customizedFilter = function(item) {
    if (!$scope.filterCriteria) {
        return true;
    }

    // Insert your specific filter conditions here
    return item.description.indexOf($scope.searchText) >= 0;
};

Next, utilize this custom filter in your template:

<div class="panel" ng-repeat="item in items | filter:customizedFilter">
    {{item.description}}
</div>

Answer 5

Answer №3

<div ng-if="!filter" class="panel" ng-repeat="resource in resources">
    {{resource.content}}
</div>
<div ng-if="filter" class="panel" ng-repeat="resource in resources| filter:resourceSearch.text">
    {{resource.content}}
</div>

My apologies for the lack of description, I tend to use this format when I believe it appears only once, as it looks more organized when flattened.

<div ng-if="!filter" class="panel" ng-repeat="resource in resources">{{resource.content}}</div>
<div ng-if="filter" class="panel" ng-repeat="resource in resources|filter:resourceSearch.text">{{resource.content}}</div>

If you prefer a more comprehensive solution, consider setting up a custom filter and inject 'filter'.

app.filter('conditionalFilter', function (filter) {
  return function (item, condition) {
    if(condition){
       return filter.bind(this,item).apply(this,[].slice.call(arguments,2));
    } else{ return item }
  };
});

And then:

<div class="panel" ng-repeat="resource in resources| conditionalfilter : !!filter : researchSearch.text" >
    {{resource.content}}
</div>

I have not tested this yet, so please let me know if there are any errors.

Answer 6

<div ng-if="!filter" class="panel" ng-repeat="resource in resources">
    {{resource.content}}
</div>
<div ng-if="filter" class="panel" ng-repeat="resource in resources| filter:resourceSearch.text">
    {{resource.content}}
</div>

My apologies for the lack of description, I tend to use this format when I believe it appears only once, as it looks more organized when flattened.

<div ng-if="!filter" class="panel" ng-repeat="resource in resources">{{resource.content}}</div>
<div ng-if="filter" class="panel" ng-repeat="resource in resources|filter:resourceSearch.text">{{resource.content}}</div>

If you prefer a more comprehensive solution, consider setting up a custom filter and inject 'filter'.

app.filter('conditionalFilter', function (filter) {
  return function (item, condition) {
    if(condition){
       return filter.bind(this,item).apply(this,[].slice.call(arguments,2));
    } else{ return item }
  };
});

And then:

<div class="panel" ng-repeat="resource in resources| conditionalfilter : !!filter : researchSearch.text" >
    {{resource.content}}
</div>

I have not tested this yet, so please let me know if there are any errors.

Is there a way to selectively include a filter in ng-repeat within a directive?

Answer №1

Answer №2

Answer №3

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