AngularJS: Incorporate a loading spinner at the beginning of the document object model

Question

AngularJS: Incorporate a loading spinner at the beginning of the document object model

After spending some time searching for the best way to accomplish this task without any luck, I am starting to doubt my search skills or perhaps no one has posed this question before. Despite leaning towards the former, I still find myself at a dead end.

My inquiry pertains to determining the optimal method for adding an element to the top of the DOM in AngularJS so that it surpasses everything else displayed. Any insights on this matter would be greatly appreciated.

Currently, my workaround involves displaying a modal with a loading spinner enclosed within it. However, I believe this approach is rather unsightly and feel that there should be a simpler way to add my own div element to the DOM showcasing the spinner.

Below is the code segment from my existing modal:

<div class="modal-body" style="text-align: center;">
    <i class="fa fa-spinner fa-spin fa-5x"></i>
</div>

Hence, you can comprehend why I view embedding it in a modal as unnecessary and unattractive. While I have looked into directives, I remain uncertain about their implementation and how I could exhibit them in the desired location.

javascript angularjs dom angularjs-directive

Answer 1

Answer №1

For a recent project, I came up with a similar solution to display loading data. By creating a div and setting its size to cover the entire screen, you can control when it is visible by toggling a variable.

The CSS code I used looks like this:

#loading-overlay {
    position: fixed;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,.5); 
    z-index:10000;
    text-align: center;
    vertical-align: middle;
}

To ensure the overlay is always on top and to give it a semi-transparent appearance, make sure to set a high z-index value. Feel free to customize the styling as needed.

Here's an example of how the HTML could look:

<div id="loading-overlay" data-loading>
        <i class="icon-spinner icon-do-spin" ></i>
</div>

Just a heads-up, 'icon-do-spin' is a neat class from FontAwesome that animates the spinner icon, while 'data-loading' is a directive I implemented to monitor the completion of all HTTP requests. You can use Angular directives like ng-show/ng-hide/ng-if to manage the visibility of the loading overlay efficiently.

Answer 2

For a recent project, I came up with a similar solution to display loading data. By creating a div and setting its size to cover the entire screen, you can control when it is visible by toggling a variable.

The CSS code I used looks like this:

#loading-overlay {
    position: fixed;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,.5); 
    z-index:10000;
    text-align: center;
    vertical-align: middle;
}

To ensure the overlay is always on top and to give it a semi-transparent appearance, make sure to set a high z-index value. Feel free to customize the styling as needed.

Here's an example of how the HTML could look:

<div id="loading-overlay" data-loading>
        <i class="icon-spinner icon-do-spin" ></i>
</div>

Just a heads-up, 'icon-do-spin' is a neat class from FontAwesome that animates the spinner icon, while 'data-loading' is a directive I implemented to monitor the completion of all HTTP requests. You can use Angular directives like ng-show/ng-hide/ng-if to manage the visibility of the loading overlay efficiently.

Answer 3

Answer №2

If you're working with Angular, you'll need a directive to interact with the DOM and a service to manage loaders. Check out this simple demo for a clear example of how it all comes together:

index.html

<!DOCTYPE html>
<html data-ng-app="Demo">
  <head>
    <script data-require="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ed8c838a98818097bbff86da9e939f999295">[email protected]</a>" data-semver="1.2.22" src="https://code.angularjs.org/1.2.22/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>
  <body data-ng-controller="LoaderController as ctrl">
    <div data-loader class="loader" data-ng-class="{'visible':Loader.visible}"></div>
    <button data-ng-click="ctrl.show(true)">Loader</button>
  </body>
</html>

script.js

(function() {
  'use strict';

  angular.module('Demo', []);

  angular.module('Demo').directive('loader', [function(){
    return {
      'restrict' : 'A',
      'controller' : ['$scope', 'Loader', function($scope, Loader){
        $scope.Loader = Loader;
      }]
    }
  }]);

  angular.module('Demo').factory('Loader', [function(){
    var instance = {}

    instance.show = function(on){
      instance.visible = on;
    }

    return instance;
  }]);

  angular.module('Demo').controller('LoaderController', ['$timeout', 'Loader', function($timeout, Loader){
    this.show = function(){
      Loader.show(true);
      $timeout(function(){
        Loader.show(false);
      }, 5000)
    }
  }]);
})();

style.css

html, body {
  margin: 0;
  padding: 0;
}

.loader {
  opacity: .5;
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 0, 0, 0.5);
  display: none;
}

.loader.visible {
  display: block;
}

Answer 4

If you're working with Angular, you'll need a directive to interact with the DOM and a service to manage loaders. Check out this simple demo for a clear example of how it all comes together:

index.html

<!DOCTYPE html>
<html data-ng-app="Demo">
  <head>
    <script data-require="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ed8c838a98818097bbff86da9e939f999295">[email protected]</a>" data-semver="1.2.22" src="https://code.angularjs.org/1.2.22/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>
  <body data-ng-controller="LoaderController as ctrl">
    <div data-loader class="loader" data-ng-class="{'visible':Loader.visible}"></div>
    <button data-ng-click="ctrl.show(true)">Loader</button>
  </body>
</html>

script.js

(function() {
  'use strict';

  angular.module('Demo', []);

  angular.module('Demo').directive('loader', [function(){
    return {
      'restrict' : 'A',
      'controller' : ['$scope', 'Loader', function($scope, Loader){
        $scope.Loader = Loader;
      }]
    }
  }]);

  angular.module('Demo').factory('Loader', [function(){
    var instance = {}

    instance.show = function(on){
      instance.visible = on;
    }

    return instance;
  }]);

  angular.module('Demo').controller('LoaderController', ['$timeout', 'Loader', function($timeout, Loader){
    this.show = function(){
      Loader.show(true);
      $timeout(function(){
        Loader.show(false);
      }, 5000)
    }
  }]);
})();

style.css

html, body {
  margin: 0;
  padding: 0;
}

.loader {
  opacity: .5;
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 0, 0, 0.5);
  display: none;
}

.loader.visible {
  display: block;
}

AngularJS: Incorporate a loading spinner at the beginning of the document object model

Answer №1

Answer №2

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