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Detailed explanation of the steps for calling child components from Angular parent components
Detailed explanation of the steps for calling child components from Angular parent components
This time I will bring you a detailed explanation of the steps for calling a child component from an Angular parent component. What are the precautions for calling a child component from an Angular parent component? The following is a practical case, let's take a look.
Component is a special instruction that uses simpler configuration items to build a component-based application architecture. This article mainly introduces Angular components - parent components call child component methods. Friends who need it can Refer to the followingUnderstanding components
Component is a special instruction that uses simpler configuration items to build a component-based application architecture This way he can simply write apps through similar web Component or angular2 styles. web Component is a specification. It's about to become the standard. Advantages of application components:- Simpler than ordinary command configuration
- Provides better default settings and the best The practice
- is more optimized for component-based application architecture.
- The upgrade to angular2 is smoother.
- For those instructions that need to perform operations in the compile or pre-link stage, the component cannot be used because it cannot Reach that stage.
- If you want to define the priority, terminal, and multi-element of the instruction, it cannot be used.
- Components can only be triggered through element tags, and others can only be triggered by commands.
Controller call the API of the child component.
1. Create a child component child1 which has only one greeting method for the parent component to call.import { Component, OnInit } from '@angular/core';
@Component({
selector: 'app-child1',
templateUrl: './child1.component.html',
styleUrls: ['./child1.component.css']
})
export class Child1Component implements OnInit {
constructor() { }
ngOnInit() {
}
greeting(name: string) {
console.log("hello" + name);
}
} for the parent component and specify the template local variables
<app-child1 #child1> </app-child1> <app-child1 #child2> </app-child1>
reference of the child component.
Find the corresponding subcomponent through the name of the template variable child1 and assign it to the child1 variable. Once you get the reference, you can call the subcomponent method.@ViewChild('child1')
child1:Child1Component; //父组件中获得子组件的引用
ngOnInit(){
this.child1.greeting("Tom");
}
<app-child1 #child1> </app-child1> <app-child1 #child2> </app-child1>
Instructions for newbies to vue
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