What is the best way to transfer a variable between components in Angular without using the HTML page, directly within the components themselves?

Within the child component, I am working with a string:

@Input() helloMessage:string;

I am looking to assign a value to this string from another string in the parent component and utilize it within the child component without displaying the value in the html. However, I am unsure of how to access the variable from the parent component. In order to achieve this, I need to do 

this.helloMessage=parentComponentVariable
, as the helloMessage variable is required for use in the child component's methods.

angulartypescriptvariablesinputcomponents

Answer №1

Understanding the fundamentals of data binding is essential in Angular development. Consider implementing a similar approach outlined below.

@Input() message:string;

In the parent component TypeScript file:

messageParent = '';

In the parent component HTML file:

<app-child-component [message]="messageParent"></app-child-component>

Explore more about two-way data binding at https://angular.io/guide/two-way-binding.

If traditional data binding does not meet your requirements, consider using a service with BehaviorSubject to communicate between components. The parent component will emit data which can be subscribed to by the child component.

Learn more about this method in this article: https://medium.com/@weswhite/angular-behaviorsubject-service-60485ef064fc.

Services are commonly utilized for passing data between components that do not have a direct parent-child relationship.

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