How to implement component interaction in Angular2
This article mainly introduces the method of realizing component interaction in Angular2, and summarizes and analyzes the relevant operating skills and precautions for component interaction in Angular2 in the form of examples. Friends in need can refer to the following
The examples in this article describe Angular2's method of implementing component interaction. Share it with everyone for your reference, the details are as follows:
Preface
In Angular development, we often involve the interaction between components , for example, referencing components developed by our own department
Sometimes, we need to bind some data to the referenced component, or we need the referenced subcomponent to output some data
At this time, we need to handle the relationship between the components Interaction between
Key code for component interaction
Bind data from parent component to child component
Subcomponent
<h3>{{hero.name}} says:</h3>
@Input() hero: Hero;Parent component
<hero-child [hero]="myhero" ></hero-child> myhero = "Mr.IQ";
The @Input of the subcomponent here indicates that it needs the entity hero. Later, when the parent component introduces the subcomponent, it must be written in the subcomponent tag. Enter hero, and assign a value to hero in your own component to bind the parent component data to the child component
The parent component listens to the events of the child component
The child component
<button (click)="vote(true)" >Agree</button>
@Output() onVoted = new EventEmitter<boolean>();
vote(agreed: boolean) { this.onVoted.emit(agreed);}Parent component
<my-voter (myonVoted)="onVoted($event)"></my-voter>
myonVoted(agreed: boolean) { agreed ? this.agreed++ : this.disagreed++; }The @Output of the child component indicates that it will use the onVoted method to pass a boolean value to the parent component. After the parent component introduces the child component, it binds the child component's method By going to your own method, you can achieve the effect of monitoring sub-components
setter intercepts changes in input attribute values
Sub-component
<h3>"{{name}}"</h3>
private _name = '';
@Input()
set name(name: string) { this._name = (name && name.trim()) || '<no name set>'; }
get name(): string { return this._name; }Parent Component
<name-child [name]="myname"></name-child>
After the parent component references the child component, it binds data to the child component. The child component modifies and displays the data passed by the parent component through set and get
The parent component and Subcomponents interact through local variables
Subcomponent
seconds = 11;
stop() { this.message = `Holding at T-${this.seconds} seconds`; }Parent component
<button (click)="timer.stop()">Stop</button>
<p class="seconds">{{timer.seconds}}</p>
<countdown-timer #timer></countdown-timer>The subcomponent defines variables and methods. After the parent component refers to the subcomponent tag, pass Create a local variable in the label to represent the sub-component, and then use the variable to access the variables and methods of the sub-component
The above is what I have compiled for everyone. I hope it will be helpful to everyone in the future.
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