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Today in Top Angular News – Saturday, December 22

Today in Top Angular News – Saturday, December 22

Today’s topics include angular7, web, frontend, javascript, AngularJS, and Ajax. Special thanks to contributors @tomsu, Tomek Sułkowski, Anil Singh, 726514847387360, Vamsi Vempati, @charleeli, Charlee Li, The serverless webpack authors, +Yatin, Yatin, +Yatin Batra, Yatin Batra, @maxim.koretskyi, Max NgWizard K, webcodegeeks, NG_Tutorial, and MitrahSoft.


Theming Angular – The Startup – Medium

With `ViewEncapsulation.Emulated`, global styles also don’t impact a descendant component.The solution
To deal with this, we are going to use CSS Custom Properties, a.k.a. CSS variables. Property names that are prefixed with –, like –example-name, represent custom properties that contain a value that can be used in other declarations using the var() function.What it means is that you define a custom property the same way as you would a normal css property, e.g. "font-size: 16px" and it’s available to be referenced everywhere within the cascade (in the whole subtree of element that matched the selector you’ve used when defining the property.) Now, if you haven’t work with css custom properties before it takes a while to sink in (speaking from experience…), but it’s an extremely powerful tool.The important thing is not to think of them as an alternative to SASS, or Less variables — these are only calculated during compilation, so they’re static. You don’t actually have to put the custom properties [dtTheme] directly on a component, it can be applied on any HTML element in your app. The theme will be applied to everything inside:

[dtTheme]="getCustomTheme()"
dt-ptero/dt-ptero
dt-trex/dt-trex
/I’m using both custom CSS properties and SASS variables there. Continue reading


Angular Interview Questions and Books (Including 2, 4, 5, 6, 7)

  • This is a concise, complete overview of the key aspects of Angular 6.
  • It is fully up to date with the latest release of Angular.

This article provide all the important aspects required for angular developers looking for brief and useful content… Continue reading


Best practices for a clean and performant Angular application

pipe(
map(value = value.item),
take(1)
);4) Isolate API hacks
Not all APIs are bullet proof — sometimes we need to add some logic in the code to make up for bugs in the APIs. pipe(
map(value = value.item)
);6) Clean up subscriptions
When subscribing to observables, always make sure you unsubscribe from them appropriately by using operators like take, takeUntil, etc. subscribe(item = this.textToDisplay = item);After
Using takeUntil when you want to listen to the changes until another observable emits a value:
private destroyed$ = new Subject();public ngOnInit (): void {
iAmAnObservable
. pipe(
map(value = value.item)
// We want to listen to iAmAnObservable until the component is destroyed,
takeUntil(this. subscribe(item = this.textToDisplay = item);
}public ngOnDestroy (): void {
a private subject like this is a pattern to manage unsubscribing many observables in the component. Continue reading


Error handling with Angular 6 and ngx-formly – ITNEXT

In this post we assume a form field configuration like this:
fields: FormlyFieldConfig[] = [
{
key: 'name',
type: 'input',
templateOptions: {
type: 'text',
label: 'Name',
},
}
];The package versions we are using Validation
ngx-formly has built-in front-end validation and is quite easy to use. The validation function should be:
Paramters: (ctrl: FormControl) , the form control being validated is passed
Return value: boolean, return whether validation is successful

Next, add a validation config to define the error message when validation fails:
validation: {
messages: {
maxlength: 'The max length is 100 characters',
}
},The validation.messages is an object that defines the error message for each validator. So the final form config should look like this:
fields: FormlyFieldConfig[] = [
{
key: 'name',
type: 'input',
templateOptions: {
type: 'text',
label: 'Name',
},
validators: {
maxlength: ctrl = ctrl.value ctrl.value = 100,
},
validation: {
messages: {
maxlength: 'The max length is 100 characters',
}
},
}
];One special, built-in validator is required. Thus, to make the above example required, you should write:
fields: FormlyFieldConfig[] = [
{
key: 'name',
type: 'input',
templateOptions: {
type: 'text',
label: 'Name',
required: true,
},
validators: {
maxlength: ctrl = ctrl.value ctrl.value = 100,
required: 'This field is required.' Just like what we have done for the maxlength type error, we add another field to {
messages: {
maxlength: 'The max length is 100 characters',
other: (err, field) = err,
}
},In order to display whatever server returned, instead of using a fixed string as in maxlength, we use a function for other type. Continue reading


Creating a File Upload Component in Angular (Including Backend)

First, we will create a simple express server with just one route to accept file uploads. Afterward, we will create an angular application from scratch and build a beautiful file-upload component using the angular material ui-component-library. We are going to use the

Create a new application by opening a command prompt at the desired location and type:

Because we will need some complex ui-elements such as modal-windows, I decided to use the

To install this library, use this command:

To make the css of this module available in our app, we need to import it into our app's global style.css file:

Also, we are using a flexbox-design for this. To make flexbox a little bit easier to use with angular there is a library called the library like this:

To make our desired file-upload component as re-usable as possible, I decided to bundle it into a separate feature module. So let's create this DialogComponent:

The first thing we need to do is to add a file input element to our component. Continue reading


AngularJS Hover Example

Angular is a JavaScript MVC or Model-View-Controller framework developed by Google that lets developers build well structured, easily testable, and maintainable front-end applications. Here is a step-by-step guide for implementing the directive in the angular web applications. It will have the following code:

Let’s create an application to understand the basic building blocks of the directive in the angular library. Let’s see the code snippet to trigger a custom function on the mouse hover event in the angular web applications. In this tutorial, developers learned how to create a simple angular application using the hover functionality. Continue reading


AngularJS ng-change Directive Example

Hello readers, in this tutorial, we will learn how to implement and use the directive in the angular web applications. Angular is a JavaScript MVC or Model-View-Controller framework developed by Google that lets developers build well structured, easily testable, and maintainable front-end applications. It will have the following code:

Let’s create an application to understand the basic building blocks of the directive in the angular library. Let’s see the code snippet to trigger a change event in the angular web applications. In this tutorial, developers learned how to create a simple angular application using the change functionality. Continue reading


Angular.js Step by Step Beginner Tutorial

Hello readers, in this basic example, developers will learn what AngularJS is and how to start writing the code using the AngularJS framework. AngularJS is a JavaScript MVC or Model-View-Controller framework developed by Google that lets developers build well structured, easily testable, and maintainable front-end applications. It will have the following code:

Let’s create a basic welcome application to understand the basic building blocks of AngularJS library. In this section, developers learned how to create a simple application using the AngularJS library. Developers can download the sample application as an Eclipse project in the Downloads section. Continue reading


Get started with Angular Grid in 5 minutes – ag-Grid – Medium

Integration
ag-Grid and its Angular grid component can be easily integrated into any Angular project bundler setup. component.html in your favorite text editor and add the ag-grid-angular component to the markup:
ag-grid-angular
style="width: 500px; height: 500px;"
class="ag-theme-balham"
[rowData]="rowData"
[columnDefs]="columnDefs"

/ag-grid-angularThe HTML above includes a wrapper DIV element which sets the grid dimensions and specifies the grid's theme by setting the className to ag-theme-balham. Angular Grid Sorting
Enabling sorting in ag-Grid is actually quite simple — all you need to do is set the enableSorting property to true on the ag-grid-angular component:
ag-grid-angular
[enableSorting]="true"
[rowData]="rowData"
the property is added, you should be able to sort the grid by clicking on the column headers. Angular Grid Filtering
As with sorting, enabling filtering is as easy as setting the enableFilter property to true:
ag-grid-angular
[enableFilter]="true"
[rowData]="rowData"
this property is set, the grid will display a small column menu icon when you hover over the header. Angular Grid Pagination
To enable pagination in our Angular grid, all you need to do is set the pagination property to true on the ag-grid-angular component:
ag-grid-angular
[pagination]="true"
[rowData]="rowData"
adding the property, you should be able to move through the pages by using the controls at the bottom of the grid:
By default the grid uses a page size of 100 records, but it can easily be changed through configuration options. Continue reading


AngularJS Get Url Parameters Example

Hello readers, in this tutorial, we will understand how to retrieve the URL parameters in the angular web applications. It will have the following code:

Let’s start building an application to understand the basic building blocks of the module in the angular library. To make this tutorial ready for routing and reading the URL parameters, developers must include the angular route module reference i.e.

Next, we will define the angular application using the directive. This script also has an angular controller defined for the routing to get the URL parameters using the service and display them on the result page. In this section, developers learned how to use the module in the angular web applications. Continue reading

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