Steps for showcasing an image while performing in-memory processing with AngularJS

As a newcomer to JS, I am seeking guidance on how to enhance my AngularJS app. The app features a page that stores data in-memory and allows users to filter this data, which is then displayed in an ng-grid table. Is there a way to show an image like a spinner while the JavaScript processes the in-memory data? Below is what I have attempted:

The HTML:

<button ng-click="loadingTable()">View</button>
<img ng-show="loading" src="../images/loading.gif" />

<div class="gridStyle" ng-grid="gridOptions"></div>

The JS:

$scope.loadingTable = function() {

    $scope.loading = true;

    loadTable();

    function loadTable() {

    };

    $scope.loading = false;

};

Answer №1

It seems like your issue might be due to performing a synchronous compute bound operation within that function.

This can cause the UI thread to lock up, preventing any $digest loop from running until the operation is complete. As a result, the loading indicator may never actually be displayed as it toggles between true and false before the $digest is triggered.

This will lead to a frozen screen momentarily, followed by the appearance of no changes happening at all.

To solve this, you can execute the operation asynchronously using the $timeout service:

$scope.loadingData = function() {

    $scope.isLoading = true;

    $timeout(function(){
       fetchData();
    }).then(function(){
       $scope.isLoading = false;   
    });

    function fetchData() {
        // Perform asynchronous data fetching here
    };
};

You can view a simple demonstration of this approach at: http://jsfiddle.net/yourusername/examplelink/

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