Component Inputs by Link

Question

I am writing an angular2 component. In this component I have 3 inputs. I insert a variable into each of the inputs. Can I insert inputs by reference?

I want to be able to insert a variable into a component, and as soon as I change its value, I want the change to reflect on the variable outside this component. This means passing variables by reference. Is this possible in angular 2? I know that I can subscribe to events. And fire changes events. I am wondering if there is a simpler solution.

Any information regarding this issue would be greatly appreciated.

Update

This is the code for the component I created.

import { Component } from '@angular/core';
import {MdButton} from '@angular2-material/button';
import {ImageRotation} from './image-rotation';
import {FileReaderEvent} from './file-reader-event';
@Component({
selector: 'image-upload',
templateUrl: '/client/imports/components/image-upload/image-upload.html',
directives: [MdButton],
inputs: ['imageUrl','imageFile','imageRotateDegrees']
})
export class ImageUploadComponent {
imageRotationObj:ImageRotation;
imageUrl:string;
imageSrc:any;
imageFile: any;
imageRotateDegrees:number;
imageExifRotation:number;
isImageFileExif:boolean;

imageChanged() {
    var reader = new FileReader();
    reader.onload =  (e:FileReaderEvent)=> {
        var exif = EXIF.readFromBinaryFile(e.target.result);
        switch (exif.Orientation) {
            case 8:
                    this.imageRotateDegrees=-90;
                    this.imageExifRotation=-90;
                    this.isImageFileExif=true;
                this.imageRotationObj.setImageRotation(-90);
                break;
            case 3:
                    this.imageRotateDegrees=180;
                    this.imageExifRotation=180;
                    this.isImageFileExif=true;
                this.imageRotationObj.setImageRotation(180);
                break;
            case 6:
                    this.isImageFileExif=true;
                    this.imageExifRotation=90;
                    this.imageRotateDegrees=90;
                this.imageRotationObj.setImageRotation(90);
                break;
            default:
                    this.isImageFileExif=false;
        }
    };
    var reader2 = new FileReader();
    reader2.onload = (e:FileReaderEvent)=> {
        this.imageSrc=e.target.result;
    }
    reader.readAsArrayBuffer(this.imageFile);
    reader2.readAsDataURL(this.imageFile);
}

constructor() {
    this.imageRotationObj=new ImageRotation();
 }

fileOnChange(event:any) {
    this.imageFile = event.target.files[0];
    this.imageChanged();
}
}

as you can see, I defined 3 inputs. I now use this component as follows:

<image-upload [imageUrl]="imageUrl" [imageFile]="imageFile" [imageRotateDegrees]="imageRotateDegrees"></image-upload>

here I pass 3 variables to the component.

.

.. , . , , .

?

Answer 1

, , - , ViewChild '@ angular/core. ViewChild /, - :

import [Component, ViewChild, AfterViewInit] from '@angular/core'

export class ParentComponent {
  @ViewChild(ChildComponent) childComponent: ChildComponent
  parentVariable

  ngAfterViewInit() {
    this.childComponent.childVariable = this.parentVariable
  }
}

Answer 2

, , ?

: https://blog.thoughtram.io/angular/2016/10/13/two-way-data-binding-in-angular-2.html