9 Methods to Improve AngularJS performance and 9 angularjs Performance

9 Methods to Improve AngularJS performance and 9 angularjs Performance

AngularJS is a widely used web application framework. With its popularity increasing, AngularJS 4.0 has become a long-awaited application framework. Although a lot of optimizations have been made, almost every Angular expert is still dealing with various problems in AngularJS.

Currently, enterprises use Web technology in their own projects, so their online businesses are greatly affected. Therefore, it is necessary to thoroughly explore the various factors that affect enterprise growth.

However, incorrect AngularJS method may affect your app ranking in the market. Therefore, AngularJS performance optimization has become an important requirement for every AngularJS development expert. This is why we listed nine ways to improve AngularJS performance in this blog.

Recently, Brazilian computer scientists conducted a survey to find interesting facts about the causes of AngularJS programmer performance problems. There is not much information about the performance of AngularJS in the real world. However, the investigation-based research provides some evidence.

The following results are obtained:

45% of voters said the performance was affected by source code issues.

Only 8% of voters admit that they have actually changed.

Some respondents accused AngularJS of its architecture.

Some of them blame unnecessary two-way binding.

After so much discussion on AngularJS performance, we can now look at Nine Ways to Improve AngularJS performance.

AngularJS performance can be measured through its digest cycle. The digest cycle can be used as a loop. In this cycle, Angular checks the changes of all variables through all $ scopes. If $ scope. myVar is defined in the controller and marked as observation, Angular will monitor the myVar update, which is checked once every iteration loop.

1. Use the Batarang tool to benchmark Watcher.

For the Angular team, Batarang is a good development tool that reduces the debugging pressure. Although there may be many new features, they mainly help you describe and track the performance of your AngularJS. In addition, it uses the monitoring tree to determine which range is not destroyed. For example, it determines whether to destroy it by checking whether the memory usage increases.

2. Use Native JavaScript or Lodash

Lodash simply overwrites some basic logic, rather than relying on the built-in AngularJS method to improve application performance. If your application does not contain Lodash, you may need to rewrite all the code in Native JavaScript.

3. Use Chrome development tool Profiler to identify performance bottlenecks

This is a convenient tool that allows you to select the configuration file type to create. Record the allocation time point, obtain the heap snapshot, and record the allocated configuration file for memory profiling. After this performance optimization, your application will be fully presented in less than two seconds, and users can freely interact with it.

4. Minimize the number of observers

AngularJS is completely centered around its digest cycle. Whenever digest cycle is triggered, it cyclically traverses each binding to detect model changes. By reducing the number of observers, you can reduce the time consumed in each digest cycle. It can also reduce the memory usage of applications.

5. ng-if is better than ng-show.

The ng-show command switches the CSS display attribute on a specific element, while the ng-if Command actually deletes the element from the DOM and re-creates it as needed. In addition, the ng-switch command is an alternative to the ng-if Command, which has the same performance.

6. Do not use ng-repeat

The failure to use the ng-repeat command is the greatest victory for the application. Therefore, we recommend that you avoid using ng-repeat and using JavaScript to build HTML. For audible applications, use ng-if to add unnecessary observers. Using the ng-bind-html command is a better solution to this problem.

7. Use $ watchCollection (including the third parameter)

It is good to use $ watch with two parameters-but when using $ watch ('value', function () {}, true) with three parameters $ watch, this allows Angular to perform a deep check (to check each attribute of an object ). But the cost may be very expensive. To solve such a performance problem, Angular provides the $ watchCollection ('value', function () {}) command, which is almost the same as the third parameter, only check the first layer of Object Attributes at a low cost.

8. Use console. time for debugging

If your application is trying to debug the problem and affects Angular performance, you need to use console. time, which is a good API.

9. Unbind ng-model

You can unbind the input ng-model. For example, you must use ng-model-options = "{debounce: 250}" for anti-binding search input like Google }". This allows it to detect the trigger at least once every 250 ms within the digest period.

The current development time is very precious, so you need a comprehensive framework like AngularJS to quickly carry out business.

After a lot of research, we have collected some important work to improve the performance of AngularJS.

The following are four tools used to improve AngularJS performance.

1. Protractor

Protractor is the most powerful automated end-to-end Angular testing tool developed by the Angular team. Protractor is a combination of great technologies, such as NodeJS, Selenium] WebDriver, Mocha, Cucumber, and Jasmine.

2. GulpJS

GulpJS is used to automatically execute repetitive tasks. It is a stream building system. You can use JSHint or ESLint to check JavaScript.

3. TestingWhiz

TestingWhiz is one of the most user-friendly automated testing tools, because it has the features of no code script. TestingWhiz provides an end-to-end test solution for testing AngularJS applications. It has various test commands to easily create AngularJS-related tests. TestingWhiz has a relatively dynamic waiting command, so it synchronizes the time for different servers to wait for AngularJS components.

4. WebdriverIO

WebdriverIO allows you to control browsers or mobile applications only with line code. Your test code looks simple and easy to read. Its integrated testing and running tool allows you to write asynchronous commands in synchronous mode, so you don't have to worry about how to handle Promise to avoid competition conditions. In addition, it removes all the tedious setup work and can manage Selenium sessions for you.

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As we can see, Web development becomes easier with the introduction of new or improved JavaScript frameworks. To maximize the benefits from these frameworks, you must regularly optimize performance.

AngularJS is a powerful framework for building Web applications, which is unparalleled. By improving AngularJS performance, developers can do more with less code. Even the risk of "spaghetti" is greatly reduced.

The above is all the content of this article. I hope it will be helpful for your learning and support for helping customers.