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Today in Top Angular News – Thursday, March 7

Today in Top Angular News – Thursday, March 7

Today’s topics include AngularJS, Automated, javascript, nodejs, web, best, Frontend, React, Vue, Design, Css, HTML, webdev, and vuejs. Special thanks to contributors @NetanelBasal, Netanel Basal, @stephenfluin, Stephen Fluin, @michael.karen, Michael Karén, +Era Balliu, Era Balliu, pallavipaddu2, Neel Bhatt, @sanjay.ratnottar, Sanjay Ratnottar, +Juri Strumpflohner, Juri Strumpflohner, +Keyhole Software, Keyhole Software, @grimertop90, Ken Bellows, and @idoshamun, Ido Shamun.


Angular Reactive Forms: Tips and Tricks – Netanel Basal

There might be cases when we don’t want to invalidate the form just because a single control is invalid. In this instance we can set the onlySelf property to true, which means that each change only affects the control itself alone, and not its parents. Preventing Infinite Loops
In the process of setting up our form controls, we might inadvertently cause infinite loops. That’s helpful, but sometimes we want to tell Angular that this control is disabled on the initialization face. Pay attention that we must also pass the value property; otherwise Angular assumes that we want the control’s value to be { disabled: true }. Continue reading


Create Modular Components with Angular Structural Directives

Create Modular Components with Angular Structural Directives

When creating components, particularly core components, our goal is to make them as modular and as flexible and grant the consumers a high level of control over what they can pass. What we want is to give our consumers the flexibly to create it by using one of three options:
They can choose to use the default text value
They can choose to use their own text which can be static or dynamic
They can choose to pass their own template

Let’s create the error component in question, and see how we can meet the above requirements:
We have an error input that accepts either a string or a reference to a template. We also define a default error message in case the consumer doesn’t pass anything. A better approach would be to create a custom structural directive, that ensures our code is DRY and reusable. Let’s look at the directive’s implementation:
The directive is pretty straightforward; If the type of the input value is TemplateRef we render it; otherwise, we render the default template, which in our example is: p{{error}}/p which can display the default error message or a custom one. Continue reading


A plan for version 8.0 and Ivy – Angular Blog

We are planning on having Ivy as an opt-in preview as part of the version 8.0 release in Q2 of this year. Opt-in Ivy Preview
Get a preview of how your application will work with Ivy, and give us feedback so we can incorporate necessary changes and improvements into the full release. In the opt-in preview, you can expect:
Generated code that is easier to read and debug at runtime
Faster re-build time
Improved payload size (Real world applications should see some size improvements, but many more improvements are planned)
Improved template type checking
Great backwards compatibility

Ivy will not be ready for all use cases. This opt-in preview is focused on moving applications to the Ivy compiler and runtime instructions without requiring developers to rewrite their applications. We’ll be using the opt-in preview of Ivy in 8.0.0 to validate our promises about backwards compatibility and to work on any automated migration tools we might need. Continue reading


Top 10 ways to use Interceptors in Angular – Angular In Depth

Sometimes we might slip and write HTTP instead of HTTPS but with this interceptor, it will get fixed. Or maybe you want to be able to switch between HTTP and HTTPS while developing or between environments. It’s as easy as cloning the request and replacing http:// with https:// at the same time. In the example, we set the URL with HTTP but when we check the request we can see that it has been changed to HTTPS. const url = = this.http.get(url);Automagic https, why is this not higher up? Continue reading


Single Page Apps

Then we open the and write the JavaScript code for creating the Angular module, while adding dependency to it. Right under the code for the angular module, in the file we place this code:

We have injected as a parameter to the function. First we create a directory named in the folder, and inside of it we create a JavaScript file named where we will put this code snippet:

Don’t forget to script the file in the file. First we link Bootstrap’s CSS file by adding this right under the tag:

Now let’s script Bootstrap’s, Angular’s and Angular-Route’s JavaScript files by adding this code after the tag:

Also we script the file, as it contains our angular module and also other necessary things, like this:

You might want to place all this in the  section, right before the  tag, for performance reasons, as the browser will render the HTML markup first and then the JavaScript code is loaded. To make the website look a little more fancy, you create a file inside the folder (don’t forget to link it), and place this code inside it:

You can now open your Single-Page App and it will show you different views each time you click the buttons, without reloading the page, looking like this:

Such is the magic of AngularJS. Continue reading


What makes Angular best in 2019? – Quora

and now, Angular 7 is finally here, packed with exciting new features that have been promising to make the wait worthwhile! n Angular 7, the CLI prompts have been updated to v7.0.2 with new features. In addition, refresh, virtual scrolling, large lists of data, dynamic loading and unloading of parts of the DOM also were the part of improvements in CDK and Angular Material. The new drag-drop module basically provides a better way to easily create drag & drop interfaces, which is backed by sorting within a list, support for free dragging, animations, custom drag handles, transferring items between lists, previews, and placeholders. Like mentioned earlier, the new Virtual Scrolling in Angular 7 basically loads and unloads items from the DOM depending upon visible parts of lists, resulting into a much faster experience for users having huge scrollable lists. Continue reading


  • We could, for example, want to change HTTP to HTTPS.

It’s as easy as cloning the request and replacing http:// with https:// at the same time. In the example, we set the URL with HTTP but when we check the request we can see that it has been changed to HTTPS. const url = = this.http.get(url);Automagic https, why is this not higher up? Or if you want to switch between HTTP and HTTPS in development you could use the CLI:
ng serve -sslSimilarly, you could change a bit more of the URL and call it an API prefix interceptor:
req.clone({
url: environment.serverUrl + request.url
});Or you could again do it with the CLI:
ng serve — serve-path=path — base-href path/Thanks to David Herges for the CLI tips! Continue reading


An Early Look at Angular 8: Get Ready for Opt-In IVY Preview

With the Angular team announcing Angular 8.0 earlier this month, we wanted to give a quick overview of the features coming with the next big version of Angular as well as provide some basic understanding of IVY. IVY is an initiative to build a next-generation rendering pipeline for Angular, and, for this, the Angular team is currently rewriting the code that translates the Angular template to whatever we rendered in the browser. The Angular team is currently testing the IVY changes with Google’s 600+ Angular applications. Now we know why IVY is such an important project for the Angular team and the good news is that we will be able to preview IVY with Angular 8 and provide feedback so the end result will be very nice. I would request you all give IVY a try and, if you encounter any issues, please reach out to the Angular team so that they can improve the final version of IVY. Continue reading


Why Should You Use AngularJS?: Key Features And Reasons

Here, AngularJS two-way data-binding manages the synchronization amid the DOM and the model, as well as vice versa making things easier for developers using AngularJS for development. The Angular 2 with TypeScript is the most dynamic way of developing all sizes of web applications that can run in any advanced web browser and on mobile platforms. The key reasons why Angular 2 and TypeScript are the precise tools for Web Application Development
• The tooling assistance is as effective as on dot net and Java platforms
• The typescript code analyzer alerts you with the errors as you continue to type
• Use of TypeScript interfaces turns the code more crisp and simpler to interpret
• Clean code separation enables UI and the needed code that executes application logic
• The UI need not to be enabled in HTML and products support native UI for Android and iOS
• It provides a better mechanism for modularizing apps and the loading of modules
Why Prefer Angular 4? Key Takeaways
As a business, you can be confident of quicker progress, winning new clientele, and maturing rapidly by applying AngularJS while building front-end application development. AngularJS is a highly promising and significant JavaScript framework gripped by AngularJS Development Services to build a highly proficient and instinctive web as well as mobile applications. Continue reading


Learning Angular: What is the scope of your directive?

  • Learning Angular: What is the scope of your directive?

So the issue is quite clear, the directives don’t create a separate, isolated scope and thus, the variable of the directive controller on overwrites the variable of the directive controller on . Interestingly, while a normal controller creates a scope, the directive controller doesn’t do so. with your directive configuration object being defined for instance like this:

You can also have different names for the scope properties that are used internally or passed externally:

You would use in your directive template, while the user of your directive would use on the HTML. Only after I realized that the it’s directive scope contained the data of the directive’s scope I started to get suspicious. Continue reading


Part Deux: A Google Calendar Gadget in Angular.js

When looking at the entire feature, about 20% of these stories dealt with custom functionality and 80% of them dealt with issues that are common to any scheduling or calendar application: start times, end times, visibility/privacy, conflicts, notifications, etc etc. I focused on one story where, given a scheduled event (in Google calendar), the user should be able to see a list of event attendees (the roster) and mark them as present. I’m actually not going to spend a lot of time going over the API as a whole, because:

It might not seem like a cutting edge solution, but I was interested in learning more about Google gadgets. Basically, event gadgets sit on the events of the calendar itself (sometimes with a little icon or whatever), while sidebar gadgets… run in the sidebar (go figure). The API calls available to a Google calendar gadget are mutually and google.calendar.read. Continue reading


How streams can simplify your life – LogRocket

They tend to have a ton of more-or-less independent components all sitting on a page at the same time, requesting data from various sources, transforming that data, combining data from different sources in interesting ways, and ultimately, if all goes well, putting some of that data on the screen for us users to look at. Here are a few problem situations that come up all the time:
A single data source is used simultaneously by several independent components
A component needs to listen for updates from its data sources and react to them in real-time
Several independent parts of an application need to be kept in sync; updates from a single data source should be reflected everywhere as instantly as possible
User actions in one component should update several other independent components so that the one component acts as a data source for the others
Each component uses a different set of data sources, combining their outputs in unique ways, often transforming and merging data from those sources to suit that component’s needs. — This is the whole idea of the Observer Pattern: as soon as a subject emits data, its observers find out about it and can react in real time
Several independent parts of an application need to be kept in sync; updates from a single data source should be reflected everywhere as instantly as possible. — Multiple observers can observe the same subject, so keeping different components in sync is easy
User actions in one component should update several other independent components so that the one component acts as a data source for the others. In RxJS, the Subject type has a method called “next” that can be called to hand some data to the subject:

Each component uses a different set of data sources, combining their outputs in unique ways, often transforming and merging data from those sources to suit that component’s needs. Continue reading

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