AngularJS Performance Tuning in Enterprise App-2019

AngularJS Performance Tuning in Enterprise App2019 medium.com/@robertj5343/angularjs-performance-tuning-in-enterprise-app-2019-75c85beb37bb Robert Johnson

21 February 2019

Robert Johnson Feb 21

With apps becoming so popular, many apps are being created for similar purposes making it confusing for consumers to choose among them. In order to ensure an app’s success, AngularJS companies share that before developing any application, it is always important to use the technology stack in a beneficial way. Unless we use a technology effectively, it doesn’t count. However, some challenges may crop up, that need to be fixed, share AngularJS app development company. Let us have a look at what are some challenges that can occur and how they can be addressed.

ParseHTML According to AngularJS companies, the style and layout changes are applied by the browser in small batches. When batching is not possible, lagging is caused making too many DOM operations are costly. A possible solution is to write inline templates in directive’s template property.

Besides this, Angular’s built-in $templateCache can be prefilled with your own templates. Whenever an external template is needed, the cache is checked by angular. Many basic tasks automatically combine and minimize the HTML templates and prefill the AngularJS $templateCache

Slow dirty checking

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According to AngularJS companies, Dirty Checking involves recognizing changes and reacting to changes. When too many watchers are registered and the complexity of the values being watched is high, recognizing changes can be prolonged while reacting to changes can be very slow. This, according to AngularJS companies, can be resolved by using the following approaches: Use unregister function to unregister all the watches after using the watcher: var unregisterFunction = $scope.$watch(‘namehere’, function() {expression}); unregisterFunction (); $watch function with 2 parameters is fast.

Angular also supports a 3rd parameter to $watch: $watch(‘val’, function(){}, true); allowing it to perform deep checking, i.e checking each and every property of the object, which in turn, could be more expensive resulting in performance issue.

To solve this issue, $watchCollection(‘val’, function(){}) is added by Angular. This method is almost similar to $watch with 3 parameters, except that it checks only the first layer of object’s properties. This improves the performance to a great extent.

Use isolated scopes in directives and pass only necessary values/models.

Recalculate, cache and apply complex model changes to watch expression.

Pre-filter large collections, using the result as a source for ng-repeat.

Only deep-watch if required. Deep-watching uses angular. Equals on each property.

Numerous DOM operations Accessing the DOM is expensive, according to work should be done using as few DOM nodes as possible. Wherever possible, the DOM tree small should be kept small, DOM modification should be avoided, inline styles should not be set and ng-if should be used instead of ng-show/ng-hide. The ng-show directive, share AngularJS companies, toggles CSS display property on an element, whereas the ng-if directive removes the element from DOM and reconstructs it if required.

Code Duplication According to , many developers are in the habit of copying & pasting the code for similar functionalities. Instead custom directives should be used to create custom HTML tags, classes or attributes to execute required functionality on an HTML section. Then it becomes a reusable and independent component which can be embedded in HTML pages, share AngularJS companies. Each task in a controller, should have unique 2/3

responsibilities. The manner in which standard code is written, should be such that no if -else is required in case of the module requires any modification.

By keeping the model clean and having a minimum number of watchers, share AngularJS companies, it is possible to optimize the app’s performance with great ease. All the mentioned problems/solutions are applicable for any kind of AngularJS project and can be conveniently done.

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