Table of Contents
- 1 What is ngShow in angular?
- 2 How Use ng-show and Ng-hide in angular 2?
- 3 What is the difference between @component and @directive in angular?
- 4 What is the difference between ngIf and hidden?
- 5 What is * ngFor in Angular?
- 6 What is data binding in angular 2?
- 7 Should I use *ngif or *ngshould directive in CSS?
- 8 What is the difference between *ngif and [hidden]?
What is ngShow in angular?
The ng-show directive shows the specified HTML element if the expression evaluates to true, otherwise the HTML element is hidden.
How Use ng-show and Ng-hide in angular 2?
To use either ngShow or ngHide , just add the directive to the element you’d like to show or hide. Once we have that set in our markup, we can set the hello or goodbye variables in a number of different ways. You could set it in your Angular controller and have the div show or hide when your app loads up.
What is ngHide?
The ngHide directive shows or hides the given HTML element based on the expression provided to the ngHide attribute. The element is shown or hidden by removing or adding the . ng-hide CSS class onto the element. ng-hide CSS class is predefined in AngularJS and sets the display style to none (using an ! important flag).
What is the directives in angular 2?
A directive is a custom HTML element that is used to extend the power of HTML. Angular 2 has the following directives that get called as part of the BrowserModule module. If you view the app.
What is the difference between @component and @directive in angular?
What is the difference between component and directive in Angular 6? A component is a directive used to shadow DOM to create and encapsulate visual behavior called components. They are typically used to create UI widgets. A Directive is usually used while adding behavior to an existing DOM element.
ngIf will comment out the data if the expression is false. This way the data are not even loaded, causing HTML to load faster. [hidden] will load the data and mark them with the hidden HTML attribute. This way data are loaded even if they are not visible.
How do you use ngStyle?
The ngStyle attribute is used to change or style the multiple properties of Angular. You can change the value, color, and size etc. of the elements….Example:
- import {Component} from ‘@angular/core’;
- @Component(
- {selector: ‘app-server’,
- templateUrl: ‘server. component. html’,
- styles: [`
- . Online{
- color: yellow;
- }`]
What is difference between component and directive in angular 2?
Component is used to break up the application into smaller components. But Directive is used to design re-usable components, which is more behavior-oriented. That is why components are widely used in later versions of Angular to make things easy and build a total component-based model.
What is * ngFor in Angular?
*ngFor is a predefined directive in Angular. It accepts an array to iterate data over atemplate to replicate the template with different data. It’s the same as the forEach() method in JavaScript, which also iterates over an array.
What is data binding in angular 2?
Data binding is the connection bridge between View and the business logic (View Model) of the application. Data binding in Angular is the automatic synchronization between Model and the View. When the Model changes, the Views are automatically updated and vice-versa. There are many ways to bind the data in Angular.
What is the difference between ngOnChanges and ngDoCheck?
4 Answers. ngOnChanges() ( OnChanges ) is called when a value bound to an input has changed so you can run custom code when an input has changed. ngDoCheck() ( DoCheck ) is called when change detection runs so you can implement your custom change detection action.
What is ngshow and nghide in AngularJS?
ngShow and ngHide are two ng directives in AngularJS used to show and hide the elements respectively. ngShow is used to show a div tab by linking it to a Boolean variable in the script. If the value of the variable is true then the item is displayed, else the item remains hidden and the vice versa happens in the case of ngHide.
Should I use *ngif or *ngshould directive in CSS?
Using important is considered a bad practice in CSS precisely because it does upend the styling priority system (CSS is called “cascading” for a reason). Furthermore, you’re now involved with both the hidden attribute on your elements and a special rule in your stylesheet. For both these reasons, the *ngIf directive might be a better choice.
*ngIf=”myVar” These are two ways to show/hide an element. The only difference is: *ngIfwill remove the element from DOM while [hidden]will tell the browser to show/hide an element using CSS displayproperty by keeping the element in DOM.