How to Get User Inputs in Angular – Code Samples

This blog represents tips/techniques and code samples on how to get user inputs in Angular template-driven forms in an Angular app (angular 2/angular 4). Following represents techniques when using template reference variable such as #fieldName with input element.

• (keyup)=”methodName(fieldName.value)”
• (keyup.enter)=”methodName(fieldName.value)”
• (blur)=”methodName(fieldName.value)”

Technique 1: (keyup) = “methodName(fieldName.value)”

Event keyup helps capture user inputs after every keyup event. The following is the template code:

<input #fieldName (keyup) = "processKeyup(fieldName.value)"/>

The following is the component code:

@Component({
  selector: 'selector-name',
  templateUrl: './some.component.html',
  styleUrls: ['./some.component.css']
})
export class SomeComponent {
  processKeyup(value: string) {
    console.log("Value keyed: " + value);
  }
}

Technique 2: (keyup.enter) = “methodName(fieldName.value)”

Event keyup.enter helps capture user inputs after enter/return button is pressed. The following is the template code:

<input #fieldName (keyup.enter) = "processKeyupEnter(fieldName.value)"/>

The following is the component code:

@Component({
  selector: 'selector-name',
  templateUrl: './some.component.html',
  styleUrls: ['./some.component.css']
})
export class SomeComponent {
  processKeyupEnter(value: string) {
    console.log("Value entered: " + value);
  }
}

Technique 3: (blur) = “methodName(fieldName.value)”

Event blur helps capture user inputs when user entered some text in the input field and went on to browse the page without pressing enter button. The following is the template code:

<input #fieldName (blur) = "processBlur(fieldName.value)"/>

The following is the component code:

@Component({
  selector: 'selector-name',
  templateUrl: './some.component.html',
  styleUrls: ['./some.component.css']
})
export class SomeComponent {
  processBlur(value: string) {
    console.log("Value entered: " + value);
  }
}

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Ajitesh Kumar

I have been recently working in the area of Data analytics including Data Science and Machine Learning / Deep Learning. I am also passionate about different technologies including programming languages such as Java/JEE, Javascript, Python, R, Julia, etc, and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data, etc. I would love to connect with you on Linkedin.
Check out my latest book titled as First Principles Thinking: Building winning products using first principles thinking.

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