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Angular2 Call Function When The Input Changes

One of the essential features of Angular 2 is the ability to perform actions when input values change. This functionality provides flexibility and interactivity to your web applications. In this article, we will guide you through the process of calling a function when an input changes in Angular 2.

To achieve this, we will use the `(ngModelChange)` event binding available in Angular. This event allows us to listen to changes in an input field and trigger a function accordingly. Let's dive into the steps to implement this feature.

Firstly, ensure you have Angular 2 set up in your project. If you haven't already, you can add Angular to your project using npm or yarn:

Bash

npm install @angular/core @angular/forms

Once you have Angular installed, make sure to import the necessary modules in your component file. Import `FormsModule` from `@angular/forms` and add it to your module's imports array.

Javascript

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

@NgModule({
  imports: [ 
    FormsModule 
  ]
})

Now, let's create a simple input field in your component's template and bind the `(ngModelChange)` event to call a function when the input changes.

Html

In the above code, we use two-way data binding with `[(ngModel)]` to bind the input value to a variable named `inputValue`. The `(ngModelChange)` event binding triggers the `onInputChange()` function whenever the input value changes.

Next, in your component class, define the `onInputChange()` function to handle the event and perform the desired actions.

Javascript

inputValue: string;

onInputChange() {
  console.log('Input value changed:', this.inputValue);
  // Add your custom logic here
}

In the `onInputChange()` function, you can access the updated input value through the `inputValue` variable and execute any logic you need when the input changes. This could include making API calls, updating UI elements, or any other functionality based on the new input value.

Finally, you're all set! Now, whenever the user interacts with the input field and the value changes, the `onInputChange()` function will be called, allowing you to react dynamically to those changes in your Angular 2 application.

By utilizing the `(ngModelChange)` event binding in Angular 2, you can create interactive and responsive user interfaces by triggering functions based on input changes. This feature enhances the user experience and adds a layer of interactivity to your web applications. Start implementing this functionality in your projects and explore the possibilities it offers.

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