Angular input directive

Can someone explain the purpose of (input) in Angular? Below is a code example:

<input class="form-control" placeholder="person" (input)="filterPersons($event.target.value, 'Hair Colour')">

I have added a log inside the filterPersons method to track when it runs, but I'm not seeing any output when interacting with the input field. What exactly does (input) do?

It's worth mentioning that there are no errors and the codebase appears to be functioning correctly. There are other instances of this syntax in the codebase, so it doesn't seem to be a simple mistake, but I can't determine its purpose.

javascriptangulartypescriptfrontend

Answer №1

If you're looking for the solution, consider using this link: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Input/checkbox to specify the input type and then monitor changes with the change event rather than input (Checkbox does not support input):

<input type="checkbox" class="form-control" placeholder="person" (change)="filterPersons($event.target.value, 'Hair Colour')">

If triggered upon form submission, you may need to handle it programmatically or update the state when there's a change in the input.

Answer №2

Experiment with using type="text" or type="number", and you will likely observe your function running as expected. The (input) event triggers after each keystroke, allowing for real-time validation of input (The (change) event activates when you exit the field.)

Answer №3

It's puzzling why you're having trouble understanding the functionality of (input). In your code snippet:

<input class="form-control" placeholder="person" (input)="filterPersons($event.target.value, 'Hair Colour')">

The (input) event triggers the filterPersons method with two parameters.
Make sure to visit the stackblitz link provided to observe the changing values in the console.log output upon every input.
Experience the StackBlitz Demo.

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