Angular2 @Input to a property with get/set

📝 Title: Angular 2 @Input to a Property with get/set: A Complete Guide

💡 Introduction: Are you having trouble binding to a property using get/set in Angular 2? Don't worry, we've got you covered! In this blog post, we will address a common issue when trying to bind to a property with get/set, provide easy solutions, and leave you with a compelling call-to-action. Let's dive in!

🔍 Understanding the Issue: The problem arises when you want to bind to a property with get/set in your Angular 2 component. Instead of using the usual @Input decorator, you might encounter an error message stating "Can't bind to 'propertyName' since it isn't a known native property."

💡 Solution 1: Correct Syntax for @Input Setter: To bind to a property using get/set, you need to make a small change in your code. Replace the @Input decorator above the property declaration with the @Input decorator above the setter method. Here's an example:

_allowDay: boolean;
get allowDay(): boolean {
    return this._allowDay;
}
@Input('allowDay') set allowDay(value: boolean) {
    this._allowDay = value;
    this.updatePeriodTypes();
}

👉 Explanation: By moving the @Input decorator to the setter, Angular 2 recognizes that this property can be bound to a parent component.

➡️ Problem Solved! Congratulations! You have successfully bound a property with get/set in your Angular 2 component. You can now perform additional logic in the setter while still allowing parent components to bind to this property.

💡 Solution 2: Importing the Input Module: In some cases, you may still encounter the "unknown native property" error even after implementing Solution 1. In such situations, it is crucial to ensure that you import the Input module from '@angular/core' in your component file. Here's an example:

import { Component, Input } from '@angular/core';

@Component({
    selector: 'your-component',
    template: '...'
})
export class YourComponent {
    // ...
    @Input() allowDay: boolean;
    // ...
}

🔍 Understanding the Solution: Importing the Input module from '@angular/core' allows your component to access the @Input decorator and avoid the "unknown native property" error.

👉 Explanation: Double-check that your component file indeed contains the import statement for Input. If not, add it at the top of the file, above the component decorator.

✔️ Problem Solved! Now, when you bind to the property with get/set, Angular 2 will recognize it as a known native property, resolving the error message you encountered.

🎉 Conclusion and Call-to-Action: You have successfully learned how to bind to a property with get/set in Angular 2. By implementing either Solution 1 or Solution 2, you can now perform additional logic in the setter while allowing parent components to bind to the property effortlessly.

👥 We Want to Hear from You: Have you been able to implement binding to properties with get/set in your Angular 2 projects? Share your experiences, thoughts, or any other topics you'd like us to cover in the comments below!

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