Animating a div using a changing scope variable in AngularJS

Question

Animating a div using a changing scope variable in AngularJS

As a newcomer to Angular, I am looking to add animation to a div element using ng-click within an ng-repeat loop. Here is what I have attempted:

app.js

var app = angular.module( 'app', [] );

app.controller('appController', function($scope) {

    $scope.items = [
  {"id": "id1", "name": "Name 1"},
  {"id": "id2", "name": "Name 2"},
  {"id": "id3", "name": "Name 3"}
  ];

  $scope.selectedStyle = {"background-color": "blue", "color": "white"};
  $scope.selectedItem = $scope.items[0];

  $scope.selectItem = function(item) {
    $scope.selectedItem = item;
  }

});

app.html

<div ng-app="app" ng-controller="appController">
  <table class=table>
    <tbody>
      <tr ng-repeat="item in items" ng-click="selectItem(item)" ng-style="item.id === selectedItem.id && selectedStyle">
        <td>
          {{item.id}}
        </td>
      </tr>
    </tbody>
  </table>

  <div class="item-body">
    {{selectedItem.name}}
  </div>
</div>

I am trying to implement a fade-in transition effect on the "item-body" div as the item changes. Despite searching online, I have been unable to find a suitable solution. Any assistance would be greatly appreciated.

JSFiddle - https://jsfiddle.net/lpsandaruwan/ot45qdno/14/

javascript html css angularjs

Answer 1

Answer №1

Animating the elements

To achieve animation in your items, you can utilize angular by adding a class to the selected element and manage the transition through css transitions.

This eliminates the need for using $scope.selectedStyle, as all styling and transitions are handled within css.

Here is how the process works:

When a user clicks on an item, angular will assign a selected class to that element.
The css transition for the class item will control the color changes during selection and deselection.

Below is the code implementation:

var app = angular.module('app', []);

app.controller('appController', function($scope) {

  $scope.items = [{
    "id": "id1",
    "name": "Name 1"
  }, {
    "id": "id2",
    "name": "Name 2"
  }, {
    "id": "id3",
    "name": "Name 3"
  }];

  $scope.selectedItem = $scope.items[0];

  $scope.selectItem = function(item) {
    $scope.selectedItem = item;
  }

});

.item-body {
  color: red;
}
.item {
  cursor: pointer;
  transition: all 250ms linear;
}
.item.selected {
  cursor: default;
  background-color: blue;
  color: white;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="app" ng-controller="appController">
  <table class=table>
    <tbody>
      <tr ng-repeat="item in items" ng-click="selectItem(item)" class="item" ng-class="{ 'selected': selectedItem === item }">
        <td>
          {{item.id}}
        </td>
      </tr>
    </tbody>
  </table>

  <div class="item-body">
    {{selectedItem.name}}
  </div>
</div>

Animating the `item-body`

If you want to animate the item-body upon change, you can use a simple timeout function to add and remove classes dynamically.

There are also modules available that can assist in achieving this effect (such as this).

Consider the following steps:

Add a flag to signal when the item-body needs to hide or show.
Associate that flag with a class.
Use the flag to toggle the visibility of the element, similar to the previous transition setup.

var app = angular.module('app', []);

app.controller('appController', function($scope, $timeout) {

  $scope.items = [{
    "id": "id1",
    "name": "Name 1"
  }, {
    "id": "id2",
    "name": "Name 2"
  }, {
    "id": "id3",
    "name": "Name 3"
  }];

  $scope.selectedItem = $scope.items[0];

  $scope.selectItem = function(item) {
    $scope.changeIsOn = true;
    $timeout(function() {
      $scope.selectedItem = item;
      $scope.changeIsOn = false;
    }, 250);

  }

});

.item-body {
  color: red;
  transition: opacity 250ms linear;
}
.item-body.changing {
  opacity: 0;
}
.item {
  cursor: pointer;
  transition: all 250ms linear;
}
.item.selected {
  cursor: default;
  background-color: blue;
  color: white;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="app" ng-controller="appController">
  <table class=table>
    <tbody>
      <tr ng-repeat="item in items" ng-click="selectItem(item)" class="item" ng-class="{ 'selected': selectedItem === item }">
        <td>
          {{item.id}}
        </td>
      </tr>
    </tbody>
  </table>

  <div class="item-body" ng-class="{ 'changing': changeIsOn }">
    {{selectedItem.name}}
  </div>
</div>

Answer 2

Animating the elements

To achieve animation in your items, you can utilize angular by adding a class to the selected element and manage the transition through css transitions.

This eliminates the need for using $scope.selectedStyle, as all styling and transitions are handled within css.

Here is how the process works:

When a user clicks on an item, angular will assign a selected class to that element.
The css transition for the class item will control the color changes during selection and deselection.

Below is the code implementation:

var app = angular.module('app', []);

app.controller('appController', function($scope) {

  $scope.items = [{
    "id": "id1",
    "name": "Name 1"
  }, {
    "id": "id2",
    "name": "Name 2"
  }, {
    "id": "id3",
    "name": "Name 3"
  }];

  $scope.selectedItem = $scope.items[0];

  $scope.selectItem = function(item) {
    $scope.selectedItem = item;
  }

});

.item-body {
  color: red;
}
.item {
  cursor: pointer;
  transition: all 250ms linear;
}
.item.selected {
  cursor: default;
  background-color: blue;
  color: white;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="app" ng-controller="appController">
  <table class=table>
    <tbody>
      <tr ng-repeat="item in items" ng-click="selectItem(item)" class="item" ng-class="{ 'selected': selectedItem === item }">
        <td>
          {{item.id}}
        </td>
      </tr>
    </tbody>
  </table>

  <div class="item-body">
    {{selectedItem.name}}
  </div>
</div>

Animating the `item-body`

If you want to animate the item-body upon change, you can use a simple timeout function to add and remove classes dynamically.

There are also modules available that can assist in achieving this effect (such as this).

Consider the following steps:

Add a flag to signal when the item-body needs to hide or show.
Associate that flag with a class.
Use the flag to toggle the visibility of the element, similar to the previous transition setup.

var app = angular.module('app', []);

app.controller('appController', function($scope, $timeout) {

  $scope.items = [{
    "id": "id1",
    "name": "Name 1"
  }, {
    "id": "id2",
    "name": "Name 2"
  }, {
    "id": "id3",
    "name": "Name 3"
  }];

  $scope.selectedItem = $scope.items[0];

  $scope.selectItem = function(item) {
    $scope.changeIsOn = true;
    $timeout(function() {
      $scope.selectedItem = item;
      $scope.changeIsOn = false;
    }, 250);

  }

});

.item-body {
  color: red;
  transition: opacity 250ms linear;
}
.item-body.changing {
  opacity: 0;
}
.item {
  cursor: pointer;
  transition: all 250ms linear;
}
.item.selected {
  cursor: default;
  background-color: blue;
  color: white;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="app" ng-controller="appController">
  <table class=table>
    <tbody>
      <tr ng-repeat="item in items" ng-click="selectItem(item)" class="item" ng-class="{ 'selected': selectedItem === item }">
        <td>
          {{item.id}}
        </td>
      </tr>
    </tbody>
  </table>

  <div class="item-body" ng-class="{ 'changing': changeIsOn }">
    {{selectedItem.name}}
  </div>
</div>

Answer 3

Answer №2

By utilizing ng-class, you have the ability to implement the animation class depending on the specific scope value, like so:

$scope.selectedStyle = false;

<tr ng-class="({'myClass':selectedStyle})" >

Answer 4

By utilizing ng-class, you have the ability to implement the animation class depending on the specific scope value, like so:

$scope.selectedStyle = false;

<tr ng-class="({'myClass':selectedStyle})" >

Answer 5

Answer №3

To enhance your application's functionality, consider developing a custom directive that tracks changes in a designated model within your item-body section and utilizes Angular's animate service when the value is updated.

Make modifications to your HTML code by integrating the custom directive as shown below:

<div ng-app="app" ng-controller="appController">
  <table class=table>
    <tbody>
      <tr ng-repeat="item in items" ng-click="selectItem(item)" ng-style="item.id === selectedItem.id && selectedStyle">
        <td>
          {{item.id}}
        </td>
      </tr>
    </tbody>
  </table>

  <div class="item-body" my-dir ng-model="myValue">
    {{selectedItem.name}}
  </div>
</div>

Don't forget to obtain angular-animate.js and include it in your project. It is vital to inject 'ngAnimate' dependency into your module and implement the custom directive in the following manner.

Prior to this step, define a class style:

.myClass {
  background-color: red;
  transition: all 1s;
  -webkit-transition: all 1s ease-in-out;
}

Note the utilization of the $watch method for variable monitoring:

var app = angular.module('app', ['ngAnimate']);

app.controller('appController', function ($scope) {

  $scope.items = [
    { "id": "id1", "name": "Name 1" },
    { "id": "id2", "name": "Name 2" },
    { "id": "id3", "name": "Name 3" }
  ];

  $scope.selectedStyle = { "background-color": "blue", "color": "white" };
  $scope.selectedItem = $scope.items[0];

  $scope.selectItem = function (item) {
    $scope.selectedItem = item;
    $scope.myValue = item.name;
  }

}).directive("myDir", function ($animate, $timeout) {
  return function (scope, element, attrs) {
    scope.$watch('myValue', function (newValue, oldValue) {

      if (newValue != oldValue) {

        $animate.addClass(element, "myClass").then(function () {
          $timeout(function () { $animate.removeClass(element, "myClass"); });
        });
      }

    }, true);
  }
});

Answer 6

To enhance your application's functionality, consider developing a custom directive that tracks changes in a designated model within your item-body section and utilizes Angular's animate service when the value is updated.

Make modifications to your HTML code by integrating the custom directive as shown below:

<div ng-app="app" ng-controller="appController">
  <table class=table>
    <tbody>
      <tr ng-repeat="item in items" ng-click="selectItem(item)" ng-style="item.id === selectedItem.id && selectedStyle">
        <td>
          {{item.id}}
        </td>
      </tr>
    </tbody>
  </table>

  <div class="item-body" my-dir ng-model="myValue">
    {{selectedItem.name}}
  </div>
</div>

Don't forget to obtain angular-animate.js and include it in your project. It is vital to inject 'ngAnimate' dependency into your module and implement the custom directive in the following manner.

Prior to this step, define a class style:

.myClass {
  background-color: red;
  transition: all 1s;
  -webkit-transition: all 1s ease-in-out;
}

Note the utilization of the $watch method for variable monitoring:

var app = angular.module('app', ['ngAnimate']);

app.controller('appController', function ($scope) {

  $scope.items = [
    { "id": "id1", "name": "Name 1" },
    { "id": "id2", "name": "Name 2" },
    { "id": "id3", "name": "Name 3" }
  ];

  $scope.selectedStyle = { "background-color": "blue", "color": "white" };
  $scope.selectedItem = $scope.items[0];

  $scope.selectItem = function (item) {
    $scope.selectedItem = item;
    $scope.myValue = item.name;
  }

}).directive("myDir", function ($animate, $timeout) {
  return function (scope, element, attrs) {
    scope.$watch('myValue', function (newValue, oldValue) {

      if (newValue != oldValue) {

        $animate.addClass(element, "myClass").then(function () {
          $timeout(function () { $animate.removeClass(element, "myClass"); });
        });
      }

    }, true);
  }
});

Animating a div using a changing scope variable in AngularJS

Answer №1

Animating the elements

Here is how the process works:

Below is the code implementation:

Animating the `item-body`

Answer №2

Answer №3

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Animating a div using a changing scope variable in AngularJS

Answer №1

Animating the elements

Here is how the process works:

Below is the code implementation:

Animating the item-body

Answer №2

Answer №3

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Animating the `item-body`