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In: Computer Science

This is done by using Angular in Visual code: Can you please give examples of the...

This is done by using Angular in Visual code:

Can you please give examples of the following?

1. Use Math.random function to generate a number between 20 and 100 and then use the ngSwitch directive to display a letter grade based on this class grading policy.

a. add implements OnInit to the AppComponent class

b. add variable x in the AppComponent class

c. add ngOnInit(){ this.x = Math.floor(Math.random()*10);}

d. add {{x}} in the app.components.html file

e. You should see numbers from 1-9 when you refresh the page

f. Change formula in #c to generate numbers from 20 to 100.

g. Change {{x}} in #d to ngSwitch directive

2. Use attribute directives to display credit card logo based on the credit card number

Use simplified rules as follows:

4 visa

5 mastercard

34 and 37 amex

30, 36, 38, 39 diners

60, 64, 65 discover

Solutions

Expert Solution

1. Use Math.random function to generate a number between 20 and 100 and then use the ngSwitch directive to display a letter grade based on this class grading policy.

a.

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  title = 'app';

  ngOnInit() {
    this.x = Math.floor(Math.random()*10);
  }

}
<html lang="en">

<head>
    <meta charset="utf-8">
    <title>Angular</title>
    <base href="/">

    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>

<body>
    <app-root></app-root>

<div style="text-align:center">
   <h1>
      Welcome to {{x}}.
   </h1>
</div>

<app-new-cmp></app-new-cmp>
</body>
</html>

venereology answered 8 months ago
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