cómo pasar datos entre componentes en un ejemplo de código angular

Bienvenido a nuestro espacio, ahora hallarás la solucíon a lo que buscabas.

Ejemplo 1: angular @Output ()

/* @Output()
- allows data to flow from the child class to the parent class
- normally initialized with EventEmitter
*/// Parent ComponentimportComponentfrom'@angular/core'
@Component(
  selector: app-component,
  template:`
   
  

      
item
  
  `/* Template Notes
  	- (newItemEvent)='addItem($event)' --  the event binding 
      tells Angular to connect the event in the child 
      component, newEventItem, to the method in the parent, 
      addItem(), and that the event that the child is 
      notifying the parent of is to be the argument of the 
      method. 
     - $event contains the data that the child component is 
       passing to the parent.
  */)exportclassAppComponent
 	items =['item1','item2','item3'];addItem(newItem: string)this.items.push(newItem);/* Class Notes
		- `[item]` -- @Input() target from child
        - `currentItem` -- property from parent
        - `(deleteRequest)` -- the target @Output event from 
           child
        - `crossOffItem($event)` -- method from parent;	    
    */// Child ComponentimportOutput,EventEmitterfrom'@angular/core';
        
@Component(
    selector: app-item-output,
    template:`
        Add an item: 
        Add to parent's list
    `/* Template Notes
    	- #newItem stores whatever is typed into the input
        - (click) event is bound to addNewItem method and 
          passes newItem.value to the component class
    */)exportclassItemOutputComponent
    @Output() newItemEvent =newEventEmitter<string>();addNewItem(value: string)// this method emits the value of newItemEventthis.newItemEvent.emit(value);/* Component Class Notes
    	- @Output marks the property as a way for data to go
          from the child component to the parent component
        - newItemEvent is the name of the @Output
        - new EventEmitter() -- tells Angular to create
          a new event emitter of type string
        - addNewItem(value: string) -- when the user clicks the 
          button the child component lets the parent component
          know about the event and gives the data to the parent.
    */

Ejemplo 2: enviar datos angulares al componente principal

importComponent,Output,EventEmitterfrom'@angular/core';

@Component(
  selector:'app-child',
  template:`
      Send Message
  `,
  styleUrls:['./child.component.css'])exportclassChildComponent

  message: string ="Hola Mundo!"

  @Output() messageEvent =newEventEmitter<string>();constructor()sendMessage()this.messageEvent.emit(this.message)

Ejemplo 3: compartir datos entre componentes angulares

importComponent,Inputfrom'@angular/core';//Child-Component
@Component(
  selector:'app-child',
  template:`
      Say  message 
  `,
  styleUrls:['./child.component.css'])exportclassChildComponent

  @Input() childMessage: string;constructor()======================================================================importComponentfrom'@angular/core';//Parent-Component data transfer to Child-Component
@Component(
  selector:'app-parent',
  template:`
    
  `,
  styleUrls:['./parent.component.css'])exportclassParentComponent
  parentMessage ="message from parent"constructor()

Ejemplo 4: compartir datos usando el servicio angular 6

importInjectablefrom'@angular/core';importBehaviorSubjectfrom'rxjs';

@Injectable()exportclassDataServiceprivate messageSource =newBehaviorSubject('default message');
  currentMessage =this.messageSource.asObservable();constructor()changeMessage(message: string)this.messageSource.next(message)

Si posees alguna desconfianza y forma de modernizar nuestro enunciado eres capaz de dejar una observación y con deseo lo ojearemos.

---

---

Utiliza Nuestro Buscador