This AngularJS error was already partly covered in mistakes 9. This is a more thorough explanation. Just take a look at the source code, it is very readable. Watchers can also be set manually, and you have probably done that at least a few times yourself.
They can also evaluate functions. And they also take callbacks. If only a watcher changes a scope model, another digest cycle is executed. It is called from core directives, services, methods, etc. If you change a model from a custom function that does not call. It is nevertheless worth reading, as the hilarious warnings make up for it.
If you follow the trends within front end development and are a bit lazy - like me - then you probably try to not do everything by hand. Keeping track of all your dependencies, processing sets of files in different ways, reloading the browser after every file save - there is a lot more to developing than just coding.
So you may be using bower, and maybe npm depending on how you serve your app. There is a chance that you may be using grunt, gulp, or brunch. Or bash, which also is cool. In fact, you may have started your latest project with some Yeoman generator! This leads to the question: do you understand the whole process of what your infrastructure really does? Do you need what you have, especially if you just spent hours trying to fix your connect webserver livereload functionality?
Take a second to assess what you need. All those tools are only here to aid you, there is no other reward for using them. The more experienced developers I talk to tend to simplify things. Tests will not make your code free of AngularJS error messages. I am writing specifically about unit tests here, not because I feel they are more important than e2e tests, but because they execute much faster.
I must admit that the process I am about to describe is a very pleasurable one. Test Driven Development as an implementation for e. My favorite way to write tests is, I just write empty assurances first:.
After that, I write or refactor the actual code, then I come back to the tests and fill in the assurances with actual test code. Unit tests execute in a matter of a few seconds, even if you have a lot of them. Just save the test file and the runner will pick it up, evaluate your tests, and provide feedback instantly. With e2e tests, the process is much slower. My advice - split e2e tests up into test suites and just run one at a time.
Protractor has support for them, and below is the code I use for my test tasks I like gulp. Chrome dev tools allow you to point at a specific place in any of the files loaded into the browser, pause code execution at that point, and let you interact with all the variables available from that point. That is a lot! That functionality does not require you to add any code at all, everything happens in the dev tools. Not only you get access to all the variables, you also see the call stack, print stack traces, and more.
You can even configure it to work with minified files. Read about it here. There are other ways you can get similar run-time access, e. But breakpoints are more sophisticated. AngularJS also allows you to access scope through DOM elements as long as debugInfo is enabled , and inject available services through the console. Consider the following in the console:. Another great tool that comes with dev tools is the timeline. The output shows, among others, memory usage, frame rate, and the dissection of the different processes that occupy the CPU: loading, scripting, rendering, and painting.
Just record your actions which led to performance issues and see what happens. Too many watchers? You will see yellow bars taking a lot of space. Memory leaks? You can see how much memory was consumed over time on a graph. First, start your web server on host 0. Enable web inspector in settings. Here are the detailed instructions for Android And for iOS, unofficial guides are to be found easily through google.
I recently had some cool experience with browserSync. It works in a similar way to livereload, but it also actually syncs all browsers that are viewing the same page through browserSync. That includes user interaction such as scrolling, clicking on buttons, etc.
It worked nicely! Ng-init , from the sound of it, should be similar to ng-if and ng-repeat , right? Did you ever wonder why there is a comment in the docs that it should not be used? IMHO that was surprising! I would expect the directive to initialize a model. Less than you would expect?
The sixth line is what it is all about. Again, the sixth line. In the AngularJS source code, a big part of all the code are comments that describe code that was mostly readable from the beginning.
I believe it is a great way to learn about AngularJS. This guide covering most common AngularJS mistakes is almost twice as long as the other guides. Want to push myself to next step.
Like for smaller to larger screens. This is our first PWA and my first project in Angular. We are confused between PrimeNg and Bootstrap.
I read in an article that PrimeNg has got Bootstrap implemented in it from 5. Which is the best Framework for this? Stacks 45K. Follow I use this. What is AngularJS? AngularJS lets you write client-side web applications as if you had a smarter browser. Developers no longer need to exhaustively write separate code to link model-view-controller MVC layers.
Dating back to its initial release in , each and every Angular version has been maintained by dedicated Google engineers. Since Angular is open-sourced, companies that use Angular can rapidly outsource and secure assistance from vetted front-end developers. This allows companies that use Angular to effortlessly transfer features written in earlier applications to new version releases or entirely different web apps. Reusability is particularly important as small and medium-sized companies look towards building large-scale enterprise applications.
This idea of reusability across small-scale and large-scale applications is what makes Angular a leader in the web app industry. By integrating Angular into the front-end, companies can ensure that the scale of their applications meets the scale of their business demand over time.
MVC is a software design pattern that reinforces the web app development process. The MVC architecture gained popularity with organizations for isolating application logic from the user interface layer and supports a separation of concerns. Industry websites of all kinds have leveraged Angular to their advantage, anywhere from airline customer transaction systems to some of the most popular email services.
The following list of companies that use Angular all had one common motivation — using and scaling web applications to fulfill the demands of their client base. The massive multinational tech company, Microsoft, initially released Office in In April of this year, Microsoft sported 75 million daily active users. Among the companies that use Angular, Microsoft took one of the boldest approaches.
Fast forward to present-day , Microsoft Office is now packaged with a free-to-use Microsoft web application online. The free online web app features most if not all office features condensed into a single-page view, allowing businesses and users to collaborate on teams and create documents. Deutsche Bank AG, a multinational investment and financial services company, uses AngularJS for the front-page of their developer portal. Their developer portal features the Deutsche Bank API program, acting as an access point to millions of global organizations looking to integrate Deutsche Bank transaction systems into their web software.
Mixer is a free video game streaming website and service developed and released by Microsoft, ranked highly among similar competitors, such as Twitch and Youtube Gaming. In contrast to other companies that use Angular, Mixer integrated it into a video streaming use case.
Since Angular allows single-page data to be updated in real-time, Mixer employs the framework for essential game streaming features. This includes hosting fast live streaming, commenting on streams, co-hosting from your own channel, and receiving alerts when channels you follow start live streaming.
Santander Bank initially organized its services in Spain, slowly establishing its principal market in the Northeastern United States since Since Gmail was developed as a single-page emailing application in , it served as the perfect use case for integrating AngularJS.
Every time a user opens Google's mail service, the web app loads one single HTML page whilst dynamically updating information based on new messages or notifications. Unlike other frameworks, there is no need to inherit from proprietary types in order to wrap the model in accessors methods. AngularJS models are plain old JavaScript objects. This makes your code easy to test, maintain, reuse, and again free from boilerplate. Directives are a unique and powerful feature available in AngularJS.
Directives let you invent new HTML syntax, specific to your application. We use directives to create reusable components. This lets you focus either on what the application does or how the application looks separately. An important part of serious apps is localization.
AngularJS's locale aware filters and stemming directives give you building blocks to make your application available in all locales. A deep link reflects where the user is in the app. This is useful so users can bookmark and email links to locations within the app. Round trip apps get this automatically, but AJAX apps by their nature do not.
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