interpolation in angular code example

Example 1: angular property binding

// component.ts

    @Component({
      templateUrl: 'component.html',
      selector: 'app-component',
    })
    export class Component {
      name = 'Peter';

      updateName() {
        this.name = 'John';
      }
    }

Example 2: use javascript function in string interpolation angular

//angular HTML
{{secondsToHms(20)}}

//typescript
secondsToHms(d) {
    d = Number(d);
    var h = Math.floor(d / 3600);
    var m = Math.floor(d % 3600 / 60);
    var s = Math.floor(d % 3600 % 60);

    var hDisplay = h > 0 ? h + (h == 1 ? " hour, " : " hours, ") : "";
    var mDisplay = m > 0 ? m + (m == 1 ? " minute, " : " minutes, ") : "";
    var sDisplay = s > 0 ? s + (s == 1 ? " second" : " seconds") : "";
    return hDisplay + mDisplay + sDisplay; 
}

Example 3: angular interpolation

<p>{{title}}</p>
<div><img src="{{itemImageUrl}}"></div>

Example 4: angular two way property binding

/* Two-Way Data Binding
	- communicates data between the component and the view 
      (bi-directionally) 
	- this is acheived by using the ngModel directive 
	- include `import { FormsModule } from @angular/forms`	 
    - syntax: `[(ngModel)]='some value'`     
*/

import { Component } from '@angular/core';
import { FormsModule } from '@angular/forms';

@Component({
  selector: 'app-example', 
  template: `
			 Enter the value: <input [(ngModel)]='val'>
			 <br>
			 Entered  value is: {{val}}
			`
})

export class AppComponent {
  val: string = '';
}

/*
Process:
	1. View communicates inputted value to AppComponent
    2. AppComponent communicates the updated val to the view 
       via {{val}}
*/

Example 5: ? operator in angular interpolations

{{element.source == 1 ? 'upwork' : (element.source == 2 ? 'refer from friend' : '')}}

Example 6: angular property binding

import { Component } from "@angular/core";
@Component({
   selector: 'app-example',
  template: `
              <div>
              <input [value]='myText'></span>       
              </div>
              `
})
export class AppComponent {
  myText: string = "Hello World";
}