What is Structure Directives in Angular with examples and types

Hello Guys,

In this blog we are going to learn about structure directive in angular with detail understanding and examples.

What is a Structure Directive in Angular?

Angular boasts a distinctive type of directive, known as the structure directive, that is purposed to change a webpage's DOM.

Such directives abound in the ability to add, remove or manipulate elements contingent on certain given conditions. Notably, these directives differ from attribute directives, which are known to primarily affect the behavior and appearance of an element, without manipulating it structurally.

Structure directives are therefore capable of removing, or adding elements to the webpage's DOM.

Angular has three directives for built-in structure: *ngIf, *ngFor, and *ngSwitch.

Here, we'll inspect each of them more closely.

*ngIf

Rendered elements in the DOM only if the *ngIf directive is utilized for conditional purposes.

The directive will analyze an expression and only display the element when the expression evaluates to true.

In the event that a button is meant to be shown solely when a user has logged in, the *ngIf directive can be applied in the following way:

This will render the button only if the showUserName variable is true.

*ngFor

The ngFor directive is used to loop through a collection of objects and create an object for each object.

For example,

if we have an array of users, we can use the *ngFor statement like this:

This will render a list item for each user in the users array, displaying their first name.

* ngSwitch

Instructions *ngSwitch is used to activate item by value.

Evaluates an expression and compares the result with a set of values. If a match is found, the relevant content is processed.

For example,

if we have a different color that can have three values: "pink", "green" or "blue", we can use the *ngSwitch directive like this:

This will make the Element color. If the color is "green", the first div will be displayed.

If the color is "pink" the second div is shown and so on. If the color does not match any of the specified values, the status will be displayed.

If you guys have any query then you can drop a mail to us on this mail id:

techoswag@gmail.com

Comments

Different between ``===`` and ``==`` operators in JavaScript

Hello Guys, In this blog we are going to learn about "===" and "==" different with details understanding and examples. JavaScript operators that you might have stumbled upon as a developer include "===", "==". JavaScript's "==" operator is commonly utilized for loose comparison purposes. It functions by converting both of the values to a common type and then comparing them for equality. Here's an example: The comparison operator "==" transforms the value of "17" from a string to a number before determining if the values match. Consequently, if both versions of the data share the same properties and values, the comparison is marked as valid and returns true. The results of the "==" operator can occasionally be surprising, including: The comparison returns true when the "==" operator converts the empty string to the number 0 and compares it to the number 0. This can result in bugs, so ...

Configure and Build Angular application for different environments like QA and Staging

Generally in the angular application by default, we have two environment 1) Development 2) Production Environment. But In some cases, we need to add other environments for our application like QA and staging environment. So let's see how we can add multiple environments in angular application for that we have to perform some steps. Step 1:- Custom Environment File - Here For every target environment, we have to create a new file under the environment folder here i have created two files evnironment.qa.ts and environment.staging.ts Step 2:- Custom Environment Setting - Here now you have to configure your environment name and new environment API URL and other settings For Example:- Step 3:- Need to Update the angular.json file - Now in the angular project you can find the angular.json file. in that file, you have to configure your new environment like below Here I have configure for QA environment St...

What is Pipes in Angular? Built in Pipes with examples and how we can create custom pipe using angular

Hello Guys, In this blog you're going to learn about Angular Pipes with in-built pipes and and customized pipes with details understanding. As an Angular developer, you often come across situations where you need to transform data before displaying it to the user. For instance, you might want to format a date, display a currency in a specific format, or filter a list of items based on some criteria. This is where Angular Pipes come into the picture. Angular Pipes are built-in features that allow you to transform data easily and efficiently. What are Angular Pipes? Angular Pipes are a built-in feature in Angular that allow you to transform data in the template. A pipe takes in a value or values and returns a transformed value. The transformed value is then displayed in the template. Angular Pipes are similar to filters in AngularJS. However, they are more powerful and flexible. Angular Pipes can transform data in a variety of ways, including formatting, filtering, sorting, and more....

TechoSwag

Search This Blog