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cascade dropdowns in angular 6 with example | angular 7 tutorial

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In this tutorial, I am gonna discuss that how we can create cascade dropdowns using arrays in angular.

Step1: First I will create a model.ts file to declare and define the model for program




In this model, I have created two model classes, first Department class is dedicated for department dropdown and second one employee class for second drop-down control. This task will be done just like primary and foreign key relationships in which id is working as a primary key and did is working as foreign key.

Note: Never forget to pass the reference of FormsModule into app.module.ts otherwise ngModel data binding will not work.

import { FormsModule } from ‘@angular/forms’;
imports: [
BrowserModule,
FormsModule
]

Step 2. Pass reference of the model into a component class where we want to implement cascade dropdowns.

Output:

Cascade Dropdown in angular 4

 


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