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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What is the best way to enable the user to scroll smoothly while new data is continually being added to the screen?

The AJAX call fails to refresh the secondary table in CodeIgniter

Why is AngularJS $http response undefined?

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What is the best way to maintain scrollbars on mobile devices?

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When using React / Next.js, the .map() function may not rerender the output based on changes in the state array if the keys remain the same

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