I am taking one real time example which displays a list of available products based on the product selection. In this example, you will learn -
  1. How to create a Products array object using TypeScript in a class;
  2. Bind Products to dropdown list with *ngFor;
  3. Call a method to search a list of products using "ngModelChange" ;
  4. Bind Product details object to an HTML table.
Now, let's start entering the code step by step.
Build an array object and store some data in it using TypeScript in a component class.
  1. export class ProductComponent {
  3. /// this data used to display in products dropdown
  5. public ProductHeader = [{ name: 'Hp' }, { name: 'Dell'}, { name: 'Lenovo' }];
  8. /// this data used to display in products details in a html table
  10. public Products = [
  11. {Name:'Hp', title: 'HP ENVY Laptop - 15t touch', price: '1099', store: 'Best Buy', model: '15-BS013DX' },
  12. { Name: 'Dell', title: 'Dell Laptop', price: '700', store: 'Amazon', model: 'I7378-3000SLV-PUS' },
  13. { Name: 'Lenovo', title: 'Lenovo Touch-Screen Laptop', price: '670', store: 'Target', model: '81A40025US' },
  14. { Name: 'Hp', title: 'HP OfficeJet Pro 6978 All-in-One Printer', price: '100', store: 'Target', model: 'T0F29A#B1H' },
  15. { Name: 'Hp', title: 'HP Laptop - 17t touch ', price: '420', store: 'Target', model: '1EZ78AV_1' },
  16. { Name: 'Dell', title: 'Dell - XPS 27" Touch-Screen All-In-One', price: '670', store: 'Target', model: 'BBY-311C3FX' },
  17. { Name: 'Dell', title: 'Dell - Inspiron 21.5" Touch-Screen All-In-One', price: '469.90', store: 'Target', model: 'I3265-A067BLK-PUS' },
  18. { Name: 'Lenovo', title: 'Lenovo - 520-24AST 23.8" Touch-Screen All-In-One', price: '679.99', store: 'Target', model: 'F0D3000EUS' },
  19. { Name: 'Dell', title: 'Dell - XPS 2-in-1 13.3" Touch-Screen Laptop', price: '1199.99', store: 'Target', model: 'XPS9365-7086SLV-PUS' }
  20. ];
  22. constructor() {
  24. }
  27. }
Bind a ProductHeader array object to a drop-down list with *ngFor
I have used *ngFor to iterate the items in an array object. For displaying a value, use {{object.key}} (this is nothing but {{ prod.name}})
  1. import { Component, } from '@angular/core';
  3. @Component({
  5. selector: 'my-product-view',
  6. styleUrls: ['styles.css'],
  7. template: `
  8. <div>
  9. Select Product :
  10. <select>
  11. <option *ngFor="let prod of ProductHeader">{{prod.name}} </option>
  12. </select>
  13. ',
  15. })
  1. export class ProductComponent {
  3. public ProductHeader = [{ name: 'Hp' }, { name: 'Dell'}, { name: 'Lenovo' }];
  5. constructor() {
  6. /// this constructor will call once the ProductComponent class object is ready.
  7. this.getProducts();
  8. }
  10. getProducts() {
  12. return this.ProductHeader;
  13. }
  15. }
Call a method on selected dropdown list item

Whenever a user changes a value in a dropdown list, the ngModelChange changes will call a method.
  1. <select [(ngModel)]="ProductHeader.name" (ngModelChange)="SearchProduct(ProductHeader.name)">
  2. <option *ngFor="let prod of ProductHeader">{{prod.name}} </option>
  3. </select>
Create a serach ProductDetails method in a Component class as below.
  1. export class ProductComponent {
  3. //Create a object for storing filter data and bind to html table.
  4. public ProductDetails: object = [];
  6. //filter product details on name and return productDetails object.
  7. SearchProduct(name: string) {
  8. let obj = this.Products.filter(m => m.Name == name);
  9. this.ProductDetails = obj;
  10. return this.ProductDetails;
  11. }

  14. }
Bind Product details object to an HTML table
Create an HTML table with <tr> and <td> to display the product title, store, price, and model.
  1. <table class="TFtable">
  2. <tr >
  3. <th>Name</th> <th>Store</th> <th>Price</th> <th>Model</th>
  4. </tr>
  5. <tr *ngFor="let Prod of ProductDetails">
  6. <td>{{Prod.title}}</td>
  7. <td>{{Prod.store}}</td>
  8. <td>{{Prod.price}}</td>
  9. <td>{{Prod.model}}</td>
  10. </tr>
  12. </table>
Here is the complete code.
  1. import { Component, } from '@angular/core';
  3. @Component({
  5. selector: 'my-product-view',
  6. styleUrls: ['styles.css'],
  7. template: `
  8. <div>
  9. Select Product :
  10. <select [(ngModel)]="ProductHeader.name" (ngModelChange)="SearchProduct(ProductHeader.name)">
  11. <option *ngFor="let prod of ProductHeader">{{prod.name}} </option>
  12. </select>
  16. <div *ngIf="ProductHeader.name">
  17. <h5>You have selected: {{ProductHeader.name}} Product </h5>
  18. </div>
  19. </div>
  20. <div>
  21. <h4>Product Details:</h4>
  22. <table class="TFtable">
  23. <tr >
  24. <th>Name</th> <th>Store</th> <th>Price</th> <th>Model</th>
  25. </tr>
  26. <tr *ngFor="let Prod of ProductDetails">
  27. <td>{{Prod.title}}</td>
  28. <td>{{Prod.store}}</td>
  29. <td>{{Prod.price}}</td>
  30. <td>{{Prod.model}}</td>
  31. </tr>
  33. </table>
  34. </div>
  35. `,
  36. })
  38. export class ProductComponent {
  39. gi
  40. //Create a object for storing filter data and bind to html table.
  41. public ProductDetails: object = [];

  43. //filter product details on name and return productDetails object.
  44. public ProductHeader = [{ name: 'Hp' }, { name: 'Dell'}, { name: 'Lenovo' }];
  46. public Products = [
  47. {Name:'Hp', title: 'HP ENVY Laptop - 15t touch', price: '1099', store: 'Best Buy', model: '15-BS013DX' },
  48. { Name: 'Dell', title: 'Dell Laptop', price: '700', store: 'Amazon', model: 'I7378-3000SLV-PUS' },
  49. { Name: 'Lenovo', title: 'Lenovo Touch-Screen Laptop', price: '670', store: 'Target', model: '81A40025US' },
  50. { Name: 'Hp', title: 'HP OfficeJet Pro 6978 All-in-One Printer', price: '100', store: 'Target', model: 'T0F29A#B1H' },
  51. { Name: 'Hp', title: 'HP Laptop - 17t touch ', price: '420', store: 'Target', model: '1EZ78AV_1' },
  52. { Name: 'Dell', title: 'Dell - XPS 27" Touch-Screen All-In-One', price: '670', store: 'Target', model: 'BBY-311C3FX' },
  53. { Name: 'Dell', title: 'Dell - Inspiron 21.5" Touch-Screen All-In-One', price: '469.90', store: 'Target', model: 'I3265-A067BLK-PUS' },
  54. { Name: 'Lenovo', title: 'Lenovo - 520-24AST 23.8" Touch-Screen All-In-One', price: '679.99', store: 'Target', model: 'F0D3000EUS' },
  55. { Name: 'Dell', title: 'Dell - XPS 2-in-1 13.3" Touch-Screen Laptop', price: '1199.99', store: 'Target', model: 'XPS9365-7086SLV-PUS' }
  56. ];
  58. constructor() {
  60. this.getProducts();
  61. }
  62. getProducts() {
  63. console.log("getProducts");
  64. return this.ProductHeader;
  65. }
  68. SearchProduct(name: string) {
  70. let obj = this.Products.filter(m => m.Name == name);
  71. this.ProductDetails = obj;
  72. return this.ProductDetails;
  73. }
  76. }
Output