1. In Angular, describe how will you set, get and clear cookies?
For using cookies in Angular, you need to include a module called ngCookies angular-cookies.js.
To set Cookies – For setting the cookies in a key-value format ‘put’ method is used.
cookie.set('nameOfCookie',"cookieValue");To get Cookies – For retrieving the cookies ‘get’ method is used.
cookie.get(‘nameOfCookie’);To clear Cookies – For removing cookies ‘remove’ method is used.
cookie.delete(‘nameOfCookie’);2. If your data model is updated outside the ‘Zone’, explain the process how will you the view?
You can update your view using any of the following:
- ApplicationRef.prototype.tick(): It will perform change detection on the complete component tree.
- NgZone.prototype.run(): It will perform the change detection on the entire component tree. Here, the run() under the hood will call the tick itself and then parameter will take the function before tick and executes it.
- ChangeDetectorRef.prototype.detectChanges(): It will launch the change detection on the current component and its children.
3. Explain ng-app directive in Angular.
ng-app directive is used to define Angular applications which let us use the auto-bootstrap in an Angular application. It represents the root element of an Angular application and is generally declared near <html> or <body> tag. Any number of ng-app directives can be defined within an HTML document but just a single Angular application can be officially bootstrapped implicitly. Rest of the applications must be manually bootstrapped.
Example
<div ng-app=“myApp” ng-controller=“myCtrl”>
First Name :
<input type=“text” ng-model=“firstName”>
<br />
Last Name :
<input type=“text” ng-model=“lastName”>
<br>
Full Name: {{firstName + ” ” + lastName }}
</div>
4. What is the process of inserting an embedded view from a prepared TemplateRef?
@Component({
selector: 'app-root',
template: `
<ng-template #template let-name='fromContext'><div>{{name}}</ng-template>
`
})
export class AppComponent implements AfterViewChecked {
@ViewChild('template', { read: TemplateRef }) _template: TemplateRef<any>;
constructor() { }
ngAfterViewChecked() {
this.vc.createEmbeddedView(this._template, {fromContext: 'John'});
}
}5. How can you hide an HTML element just by a button click in angular?
An HTML element can be easily hidden using the ng-hide directive in conjunction along with a controller to hide an HTML element on button click.
View
<div ng-controller="MyController">
<button ng-click="hide()">Hide element</button>
<p ng-hide="isHide">Hello World!</p>
</div>
Controller
controller: function() {
this.isHide = false;
this.hide = function(){
this.isHide = true; }; }
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