Angular ng-repeat with toggle filter

Question

Angular ng-repeat with toggle filter

Looking for a way to display data in an angular application using ng-repeat? Want to add and remove filters on the displayed data with a simple click? You're in luck. Implementing a toggle filter functionality is easier than you think.

If you've already started, your view might look something like this:

<ion-item class="row" ng-repeat="t in tickets">
    <div class="col" ng-click="toggleFilter(t.name)">{{t.name}}</div>
</ion-item>

And your controller code could be similar to this:

.controller('TicketCtrl', function ($scope, $filter) {
    $scope.toggleFilter = function (name) {
        name = $filter('getSlice')(name);
        alert(name);
    }
});

While the alert displays the correct filtered item, the view doesn't update accordingly. This issue might stem from the child scope of ng-repeat. But fear not, there's always a solution waiting to be discovered. Any suggestions or solutions?

javascript angularjs angularjs-ng-repeat

Answer 1

Answer №1

To effectively monitor the status of each row (whether clicked or not), it is recommended that you maintain a record of it. It is advisable to retain the existing name of the scope property for consistency.

Below is the code snippet that will accomplish this task:

<ion-item class="row" ng-repeat="t in tickets" ng-click="t.clicked=!t.clicked">
    <div class="col" ng-if="t.clicked">{{t.name | getSlice}}</div>
    <div class="col" ng-if="!t.clicked">{{t.name}}</div>
</ion-item>

Answer 2

To effectively monitor the status of each row (whether clicked or not), it is recommended that you maintain a record of it. It is advisable to retain the existing name of the scope property for consistency.

Below is the code snippet that will accomplish this task:

<ion-item class="row" ng-repeat="t in tickets" ng-click="t.clicked=!t.clicked">
    <div class="col" ng-if="t.clicked">{{t.name | getSlice}}</div>
    <div class="col" ng-if="!t.clicked">{{t.name}}</div>
</ion-item>

Answer 3

Answer №2

The issue you are encountering is due to not updating the view properly in your AngularJS code. In $scope.toggleFilter, you are modifying a local variable instead of the variable bound to the view. To reflect changes in the view, you need to modify the bound variable directly. You can achieve this by using the $index iterator variable provided by ngRepeat. https://docs.angularjs.org/api/ng/directive/ngRepeat

Here is an example of how you should handle it:

-view:

<ion-item class="row" ng-repeat="t in tickets">
    <div class="col" ng-click="toggleFilter(t.name, $index)">{{t.name}}</div>
</ion-item>

-controller:

.controller('TicketCtrl', function ($scope, $filter) {
    $scope.toggleFilter = function (name, index) {
        $scope.tickets[index].name = $filter('getSlice')(name);
        alert(name);
    }

PS Off topic: If you are using Ionic framework for mobile devices and utilizing ng-repeat, consider using the collection repeat directive for better performance. Mobile devices may experience smoother scrolling with collection repeat compared to ng-repeat due to Angular's two-way binding mechanism. http://ionicframework.com/docs/api/directive/collectionRepeat/

Answer 4

The issue you are encountering is due to not updating the view properly in your AngularJS code. In $scope.toggleFilter, you are modifying a local variable instead of the variable bound to the view. To reflect changes in the view, you need to modify the bound variable directly. You can achieve this by using the $index iterator variable provided by ngRepeat. https://docs.angularjs.org/api/ng/directive/ngRepeat

Here is an example of how you should handle it:

-view:

<ion-item class="row" ng-repeat="t in tickets">
    <div class="col" ng-click="toggleFilter(t.name, $index)">{{t.name}}</div>
</ion-item>

-controller:

.controller('TicketCtrl', function ($scope, $filter) {
    $scope.toggleFilter = function (name, index) {
        $scope.tickets[index].name = $filter('getSlice')(name);
        alert(name);
    }

PS Off topic: If you are using Ionic framework for mobile devices and utilizing ng-repeat, consider using the collection repeat directive for better performance. Mobile devices may experience smoother scrolling with collection repeat compared to ng-repeat due to Angular's two-way binding mechanism. http://ionicframework.com/docs/api/directive/collectionRepeat/

Answer 5

Answer №3

To keep things straightforward, it's best to create a wrapper around the code:

Here is the HTML structure:

<div ng-app="app">
    <div ng-controller="ctrl">
        <button ng-click="toggleFilter()">Toggle Filter</button><br/>
        <span ng-repeat="item in data | filter:myFilter">
            {{item}}<br/>
        </span>
    </div>
</div>

And here is the JavaScript logic:

angular.module('app',[]).
controller('ctrl', function($scope){
    $scope.data = [1,2,3,4,5,6,7,8,9,10];
    $scope.shouldRunFilter = false;

    $scope.myFilter = function(item){
        if($scope.shouldRunFilter)
        {
            return item > 5;
        }

        return item;
    }

    $scope.toggleFilter = function(){
        $scope.shouldRunFilter = !$scope.shouldRunFilter;
    }
});

You can view the functioning example on JSFIDDLE.

Answer 6

To keep things straightforward, it's best to create a wrapper around the code:

Here is the HTML structure:

<div ng-app="app">
    <div ng-controller="ctrl">
        <button ng-click="toggleFilter()">Toggle Filter</button><br/>
        <span ng-repeat="item in data | filter:myFilter">
            {{item}}<br/>
        </span>
    </div>
</div>

And here is the JavaScript logic:

angular.module('app',[]).
controller('ctrl', function($scope){
    $scope.data = [1,2,3,4,5,6,7,8,9,10];
    $scope.shouldRunFilter = false;

    $scope.myFilter = function(item){
        if($scope.shouldRunFilter)
        {
            return item > 5;
        }

        return item;
    }

    $scope.toggleFilter = function(){
        $scope.shouldRunFilter = !$scope.shouldRunFilter;
    }
});

You can view the functioning example on JSFIDDLE.

Angular ng-repeat with toggle filter

Answer №1

Answer №2

Answer №3

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