Endlessly calling a function binding to a property

I've come across a very peculiar issue in my Angular application.

Imagine I have a simple example.component.ts

@Component({
    moduleId: module.id.toString(),
    selector: 'example',
    templateUrl: 'example.component.html',
    styles: [``]
})
export class ExampleComponent{
    get buttonShouldBeDisabled(){
        console.log("property call");
        return true;
    }
}

and the template looks like this

<html>
    <body>
        <button type="button" [disabled]="buttonShouldBeDisabled">Button</button>
    </body>
</html>

In the browser console, I notice that "property call" is being logged repeatedly. https://i.sstatic.net/GlA8u.png

What could be causing this behavior? Am I correct in assuming that this means the property is being called in a loop, potentially causing the browser to become unresponsive to user actions?

Answer №1

Your strategy is sound, but I recommend a slight modification:

export class ExampleComponent{
isInputValid: boolean;

updateButtonStatus(){
    console.log("calling function");
   return this.isInputValid;}}

Bind your HTML element to isInputValid like so:

<button [disabled]="!updateButtonStatus>Click Me</button>

This way, you can easily toggle the 'disabled' property by changing the boolean value. I hope this suggestion proves useful. Greetings from Munich!

Answer №2

I have also observed this phenomenon in Angular. It is not a problem per se, but rather a characteristic of how Angular monitors changes for individual components.

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