How To Bind Data To A Drop-Down List And An HTML Table With *ngfor In Angular

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. 

export class ProductComponent {

/// this data used to display in products dropdown

public ProductHeader = [{ name: 'Hp' }, { name: 'Dell'}, { name: 'Lenovo' }];


/// this data used to display in products details in a html table

public Products = [
{Name:'Hp', title: 'HP ENVY Laptop - 15t touch', price: '1099', store: 'Best Buy', model: '15-BS013DX' },
{ Name: 'Dell', title: 'Dell Laptop', price: '700', store: 'Amazon', model: 'I7378-3000SLV-PUS' },
{ Name: 'Lenovo', title: 'Lenovo Touch-Screen Laptop', price: '670', store: 'Target', model: '81A40025US' },
{ Name: 'Hp', title: 'HP OfficeJet Pro 6978 All-in-One Printer', price: '100', store: 'Target', model: 'T0F29A#B1H' },
{ Name: 'Hp', title: 'HP Laptop - 17t touch ', price: '420', store: 'Target', model: '1EZ78AV_1' },
{ Name: 'Dell', title: 'Dell - XPS 27" Touch-Screen All-In-One', price: '670', store: 'Target', model: 'BBY-311C3FX' },
{ Name: 'Dell', title: 'Dell - Inspiron 21.5" Touch-Screen All-In-One', price: '469.90', store: 'Target', model: 'I3265-A067BLK-PUS' },
{ Name: 'Lenovo', title: 'Lenovo - 520-24AST 23.8" Touch-Screen All-In-One', price: '679.99', store: 'Target', model: 'F0D3000EUS' },
{ Name: 'Dell', title: 'Dell - XPS 2-in-1 13.3" Touch-Screen Laptop', price: '1199.99', store: 'Target', model: 'XPS9365-7086SLV-PUS' }
];

constructor() {

             }


}

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}})

 

 

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

@Component({

selector: 'my-product-view',
styleUrls: ['styles.css'],
template: `
<div>
Select Product :
<select>
        <option *ngFor="let prod of ProductHeader">{{prod.name}} </option>
</select>
',

})

export class ProductComponent {

 public ProductHeader = [{ name: 'Hp' }, { name: 'Dell'}, { name: 'Lenovo' }];

     constructor() {
   /// this constructor will call once the ProductComponent class object is ready.
                   this.getProducts();
              }

getProducts() {

       return this.ProductHeader;
    }

}

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.

<select [(ngModel)]="ProductHeader.name" (ngModelChange)="SearchProduct(ProductHeader.name)">
     <option *ngFor="let prod of ProductHeader">{{prod.name}} </option>
 </select>

Create a serach ProductDetails method in a Component class as below.

export class ProductComponent {

//Create a object for storing filter data and bind to html table.
public ProductDetails: object = [];

//filter product details on name and return productDetails object.
SearchProduct(name: string) {
let obj = this.Products.filter(m => m.Name == name);
this.ProductDetails = obj;
return this.ProductDetails;
}


}

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.

<table class="TFtable">
<tr >
<th>Name</th> <th>Store</th> <th>Price</th> <th>Model</th>
</tr>
<tr *ngFor="let Prod of ProductDetails">
<td>{{Prod.title}}</td>
<td>{{Prod.store}}</td>
<td>{{Prod.price}}</td>
<td>{{Prod.model}}</td>
</tr>

</table>

 Here is the complete code.

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

@Component({

    selector: 'my-product-view',
    styleUrls: ['styles.css'],
    template: `
                <div>
                        Select Product :
                        <select  [(ngModel)]="ProductHeader.name" (ngModelChange)="SearchProduct(ProductHeader.name)">
                             <option *ngFor="let prod of ProductHeader">{{prod.name}} </option>
                         </select>



<div *ngIf="ProductHeader.name">
    <h5>You have selected: {{ProductHeader.name}} Product </h5>
</div>
                </div>
<div>
<h4>Product Details:</h4>
<table class="TFtable">
<tr >
    <th>Name</th> <th>Store</th>  <th>Price</th> <th>Model</th>
</tr>
 <tr  *ngFor="let Prod of ProductDetails">
    <td>{{Prod.title}}</td>
    <td>{{Prod.store}}</td>
    <td>{{Prod.price}}</td>
    <td>{{Prod.model}}</td>
</tr>

</table>
</div>
               `,
})

export class ProductComponent {
gi
  //Create a object for storing filter data and bind to html table.
    public ProductDetails: object = [];

  //filter product details on name and return productDetails object.
    public ProductHeader = [{ name: 'Hp' }, { name: 'Dell'}, { name: 'Lenovo' }];

    public Products = [
        {Name:'Hp', title: 'HP ENVY Laptop - 15t touch', price: '1099', store: 'Best Buy', model: '15-BS013DX' },
        { Name: 'Dell', title: 'Dell Laptop', price: '700', store: 'Amazon', model: 'I7378-3000SLV-PUS' },
        { Name: 'Lenovo', title: 'Lenovo Touch-Screen Laptop', price: '670', store: 'Target', model: '81A40025US' },
        { Name: 'Hp', title: 'HP OfficeJet Pro 6978 All-in-One Printer', price: '100', store: 'Target', model: 'T0F29A#B1H' },
        { Name: 'Hp', title: 'HP Laptop - 17t touch ', price: '420', store: 'Target', model: '1EZ78AV_1' },
        { Name: 'Dell', title: 'Dell - XPS 27" Touch-Screen All-In-One', price: '670', store: 'Target', model: 'BBY-311C3FX' },
        { Name: 'Dell', title: 'Dell - Inspiron 21.5" Touch-Screen All-In-One', price: '469.90', store: 'Target', model: 'I3265-A067BLK-PUS' },
        { Name: 'Lenovo', title: 'Lenovo - 520-24AST 23.8" Touch-Screen All-In-One', price: '679.99', store: 'Target', model: 'F0D3000EUS' },
        { Name: 'Dell', title: 'Dell - XPS 2-in-1 13.3" Touch-Screen Laptop', price: '1199.99', store: 'Target', model: 'XPS9365-7086SLV-PUS' }
       ];

    constructor() {

        this.getProducts();
    }
    getProducts() {
        console.log("getProducts");
        return this.ProductHeader;
    }


    SearchProduct(name: string) {

        let obj = this.Products.filter(m => m.Name == name);
        this.ProductDetails = obj;
        return this.ProductDetails;
    }


}

Output