Display a spinner while Angular is in the process of linking components

Question

Display a spinner while Angular is in the process of linking components

My current situation involves a view that takes around 3 seconds to render. During this time, users are left waiting with no indication of progress on the page. I attempted to implement a spinner for visual feedback, but unfortunately, it remains stuck and does not spin as intended. It seems that the browser is waiting for the JavaScript code to finish executing before allowing the spinner to display properly. If the issue stems from the fact that the JavaScript code runs for 3 seconds, restricting browser control, how can I optimize this process? Without the framework, I could break my code into smaller segments and execute them with timeouts, but I am unsure how to achieve this within Angular during its linking phase.

UPDATE:
To illustrate the problem, I have provided a jsfiddle. The spinner fails to spin when the execution remains within a loop.

<img src="http://content.markitcdn.com/corporate/ResourceManager/9Iy-xMz_zHH-zXFAlhM-KA2/d/f/635151312565356632/Content/Images/Icons/General/spinner2.gif" alt="">
<script>
    console.log('entering loop')
    for (var i=0;i<300000000;i++) {}
    console.log('leaving loop')
</script>

javascript angularjs

Answer 1

Answer №1

Implementing a loader in Angular apps can be done in a simple way. By using the following LESS code, which can easily be converted to CSS:

.loader{
    position: fixed;
    top:0;
    bottom:0;
    left:0;
    right:0;
    background:rgba(0, 0, 0, 0.45);
    z-index: 9999999999;

    i{
        font-size:80px;
        height:80px;
        width:82px;
        color:#fff;
        display:block;
        text-align: center;
        vertical-align:middle;
        margin: auto;
        position: absolute;
        top: 0;
        left: 0;
        bottom: 0;
        right: 0;
    }
}

To include this loader in your ng-view, insert the following HTML:

<div class="loader show">
    <i class="fa fa-circle-o-notch fa-fw fa-spin"></i>
</div>

It's worth noting that Font Awesome is used for the loading animation instead of a .gif file.

For additional resources and information, check out:

<- Madness Labs' blog post on how to utilize package managers for installing dependencies like Font-Awesome, angular, angular-route, etc.

Answer 2

Implementing a loader in Angular apps can be done in a simple way. By using the following LESS code, which can easily be converted to CSS:

.loader{
    position: fixed;
    top:0;
    bottom:0;
    left:0;
    right:0;
    background:rgba(0, 0, 0, 0.45);
    z-index: 9999999999;

    i{
        font-size:80px;
        height:80px;
        width:82px;
        color:#fff;
        display:block;
        text-align: center;
        vertical-align:middle;
        margin: auto;
        position: absolute;
        top: 0;
        left: 0;
        bottom: 0;
        right: 0;
    }
}

To include this loader in your ng-view, insert the following HTML:

<div class="loader show">
    <i class="fa fa-circle-o-notch fa-fw fa-spin"></i>
</div>

It's worth noting that Font Awesome is used for the loading animation instead of a .gif file.

For additional resources and information, check out:

<- Madness Labs' blog post on how to utilize package managers for installing dependencies like Font-Awesome, angular, angular-route, etc.

Answer 3

Answer №2

When working on a controller that fetched and displayed a list of databases from a SQL Server, I encountered an issue where the UI would freeze instead of displaying a wait cursor until the data was returned. To fix this, I implemented a solution by toggling an isWaiting flag using a $rootScope method. This allowed me to display the wait cursor in the view and clear the flag at the end of the asynchronous process.

While your situation may be different, you can consider adapting a similar approach. You could use a method on $scope instead of $rootScope for your specific needs, and implement a div-level class to control the visibility of a spinner image.

Note: I applied this solution in a desktop app using node-webkit, but I believe it could also work in a standard browser environment.

CSS:

html.wait, html.wait * {
  cursor: wait !important;
}

MainController:

// defines a method accessible from any controller
$rootScope.toggleWaiting = function (isWaiting) {
    $rootScope.isWaiting = isWaiting;
    $('html')[isWaiting ? 'addClass' : 'removeClass']('wait');
};

DatabasesController:

.controller('databasesController', ['$rootScope', '$scope', function($rootScope, $scope) {

    $rootScope.toggleWaiting(true);

    var SqlServerHelper = require("SqlServerHelper");
    var sqlServerHelper = new SqlServerHelper(/* sensitive config info removed */);

    sqlServerHelper.getDatabases(function(err, results) {
        /* standard error handling removed */
        $scope.$apply(function() {
            $rootScope.toggleWaiting(false);
            $scope.databaseList = results;
        });
    });

}])

P.S. If the spinner image still appears frozen, consider using $timeout from your controller to initiate the lengthy process asynchronously. This way, it should run on a background thread, depending on the nature of the task that is taking a while to complete (such as making asynchronous calls to external resources).

Answer 4

When working on a controller that fetched and displayed a list of databases from a SQL Server, I encountered an issue where the UI would freeze instead of displaying a wait cursor until the data was returned. To fix this, I implemented a solution by toggling an isWaiting flag using a $rootScope method. This allowed me to display the wait cursor in the view and clear the flag at the end of the asynchronous process.

While your situation may be different, you can consider adapting a similar approach. You could use a method on $scope instead of $rootScope for your specific needs, and implement a div-level class to control the visibility of a spinner image.

Note: I applied this solution in a desktop app using node-webkit, but I believe it could also work in a standard browser environment.

CSS:

html.wait, html.wait * {
  cursor: wait !important;
}

MainController:

// defines a method accessible from any controller
$rootScope.toggleWaiting = function (isWaiting) {
    $rootScope.isWaiting = isWaiting;
    $('html')[isWaiting ? 'addClass' : 'removeClass']('wait');
};

DatabasesController:

.controller('databasesController', ['$rootScope', '$scope', function($rootScope, $scope) {

    $rootScope.toggleWaiting(true);

    var SqlServerHelper = require("SqlServerHelper");
    var sqlServerHelper = new SqlServerHelper(/* sensitive config info removed */);

    sqlServerHelper.getDatabases(function(err, results) {
        /* standard error handling removed */
        $scope.$apply(function() {
            $rootScope.toggleWaiting(false);
            $scope.databaseList = results;
        });
    });

}])

P.S. If the spinner image still appears frozen, consider using $timeout from your controller to initiate the lengthy process asynchronously. This way, it should run on a background thread, depending on the nature of the task that is taking a while to complete (such as making asynchronous calls to external resources).

Answer 5

Answer №3

If you're not familiar with angular apps, but looking for something for a browser, check out this fiddle - it requires very little effort for some great animation! http://jsfiddle.net/qzLdjq3c/5/

$(window).load(function() {
    $('.spinner').show();
    $(".spinner").hide();
});

Answer 6

If you're not familiar with angular apps, but looking for something for a browser, check out this fiddle - it requires very little effort for some great animation! http://jsfiddle.net/qzLdjq3c/5/

$(window).load(function() {
    $('.spinner').show();
    $(".spinner").hide();
});

Answer 7

Answer №4

Consider implementing ng-cloak for this scenario

When ng-cloak is applied, the class is taken out during compilation process. It's commonly paired with display: none, but you can also use it to show a loading spinner.

Answer 8

Consider implementing ng-cloak for this scenario

When ng-cloak is applied, the class is taken out during compilation process. It's commonly paired with display: none, but you can also use it to show a loading spinner.

Display a spinner while Angular is in the process of linking components

Answer №1

Answer №2

Answer №3

Answer №4

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