Best approach for loading data asynchronously in AngularJS

Imagine this scenario: we have some JSON data that needs to be displayed for the end user. Typically, I would use an Angular factory to retrieve the data, incorporate the factory into the controller, and then showcase the data through a loop statement or directive.

However, as the data expands from dozens to thousands, and with the addition of complex animations in the views, the loading times skyrocket.

There are numerous methods for handling data loading (such as lazy loading and $q service), but determining the most reliable approach for serving data asynchronously remains a question.

Answer №1

If I understand your query correctly, it seems that you are facing a challenge with displaying a large amount of data, which can lead to issues in two main areas:

Challenge 1: Loading the Data

To optimize loading speed, consider implementing pagination to divide the data into smaller pages and enhance load times.

Challenge 2: $$watchers Count

When using ng-repeat, the $$watchers count may escalate rapidly, causing delays in the $digest cycle and resulting in an unresponsive UI. To address this issue, try incorporating virtualization techniques like UI-grid. This approach only renders visible portions of the data on screen until scrolled, optimizing performance by avoiding unnecessary rendering of off-screen content.

Answer №2

Aside from Martijn Welker's response, here are some additional points that may be beneficial.

1. Start by retrieving the large data after the page has finished loading. While smaller data like global stats can be retrieved during the initial page load using a resolver, data in the table should be fetched after the page is fully loaded. Consider displaying a loading icon on the table section during this process.

2. Instead of presenting the data directly to the user as JSON (similar to a JSON file), consider improving the display by incrementally revealing the data similar to how JSONblob.com functions. For example, showing top level keys initially and then allowing users to click on a key to reveal further details. Design your backend to accommodate different requests for various levels and keys or utilize headers like:

user > profile > education

Allow users to interact with these headers and store previous details if they wish to navigate back.

3. Utilize pagination (either on the backend or frontend) depending on your requirements. If you do not need to sort or filter the data and it is read-only, consider implementing one-way binding (Angular 1.3+) to reduce watches on your list. Additionally, consider using plain JavaScript to construct this list, although pagination might not typically be required for displaying JSON data.

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