我创建了一个自定义控件,我以编程方式提供值,因为它是一个基于cropper.js的图像编辑器,用户通过正常的fileinput“上传”图像,而我然后使用File API将图像分配给我的自定义控件。Angular 2,自定义控件永远不会被标记为脏
这里的代码(我删除了一些cropper.js的可读性特定代码)
import {
Component,
OnInit,
ViewChild,
ElementRef,
ViewEncapsulation,
forwardRef
} from '@angular/core';
import { NG_VALUE_ACCESSOR, ControlValueAccessor } from '@angular/forms';
import * as Cropper from 'cropperjs';
import { Photo } from '../entities/photo';
@Component({
selector: 'image-edit',
templateUrl: 'image-edit.component.html',
styleUrls: [
'image-edit.component.scss',
'../../../node_modules/cropperjs/dist/cropper.min.css'
],
encapsulation: ViewEncapsulation.None,
providers: [
{
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => ImageEditComponent),
multi: true
}
]
})
export class ImageEditComponent implements OnInit, ControlValueAccessor {
get value() {
return this.cropperImage.nativeElement.src;
}
set value(v: string) {
this.cropperImage.nativeElement.src = v;
}
public onTouch:() => void;
public onChange: (_: any) => void;
@ViewChild('cropperImage')
private cropperImage: ElementRef;
private isDisabled: boolean;
// cropper.js
private cropper: Cropper;
private cropperOptions: Cropper.CropperOptions = {};
public ngOnInit(): void {
// init cropper.js
}
public writeValue(obj: any): void {
if (obj) {
this.value = obj;
this.initializeCropperOrReplaceImage();
}
}
public registerOnChange(fn: any): void {
this.onChange = fn;
}
public registerOnTouched(fn: any): void {
this.onTouch = fn;
}
public setDisabledState(isDisabled: boolean): void {
this.isDisabled = isDisabled;
}
private initializeCropperOrReplaceImage(): void {
if (!this.isCropperInitialized) {
this.cropper = new Cropper(this.cropperImage.nativeElement, this.cropperOptions);
this.isCropperInitialized = true;
}
else {
this.cropper.replace(this.cropperImage.nativeElement.src);
}
URL.revokeObjectURL(this.cropperImage.nativeElement.src);
}
}
这里的模板
<image-edit [hidden]="!photo.data" #photoData="ngModel" name="photoData" [(ngModel)]="photo.data" validateMinImageDimensions minWidth="300" minHeight="400">
</image-edit>
不幸的是我的控制从来都不是脏或感动。 我试图扩展AbstractForm并设置自己的脏,但它没有工作。它保持不污染和未受影响。
任何想法我做错了什么?
编辑
我因为根据@在writeValue
删除调用onTouch
和onChange
n00dl3答案和注释(见那里)它不是一个很好的解决方案。
请添加您的组件模板。 – n00dl3