Created
December 1, 2016 03:08
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An angular 2 value accessor for content editable fields (for use with ngModel)
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| import { forwardRef, Directive, ElementRef, HostListener, Renderer, SecurityContext } from '@angular/core'; | |
| import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms'; | |
| import { DomSanitizer } from '@angular/platform-browser'; | |
| type OnChangeFn = (innerHTML: string) => void; | |
| type OnTouchFn = () => void; | |
| const ENTER_KEY_CODE = 13; | |
| @Directive({ | |
| selector: '[contenteditable]', | |
| providers: [ | |
| { | |
| provide: NG_VALUE_ACCESSOR, | |
| useExisting: forwardRef(() => ContentEditableValueAccessor), | |
| multi: true | |
| } | |
| ] | |
| }) | |
| export class ContentEditableValueAccessor implements ControlValueAccessor { | |
| private elementRef: ElementRef; | |
| private renderer: Renderer; | |
| private onChange: OnChangeFn; | |
| private onTouched: OnTouchFn; | |
| private domSanitizer: DomSanitizer; | |
| constructor(elementRef: ElementRef, renderer: Renderer, domSanitizer: DomSanitizer) { | |
| this.elementRef = elementRef; | |
| this.renderer = renderer; | |
| this.domSanitizer = domSanitizer; | |
| } | |
| @HostListener('input', [ ]) | |
| onInput(): void { | |
| const innerHTML = this.elementRef.nativeElement.innerHTML; | |
| this.onChange(innerHTML); | |
| } | |
| @HostListener('keypress', [ '$event' ]) | |
| onKeypress(event: KeyboardEvent): void { | |
| if (event.keyCode === ENTER_KEY_CODE) { | |
| // prevent enter from creating new paragraphs | |
| event.preventDefault(); | |
| } | |
| } | |
| @HostListener('blur', []) | |
| onBlur(): void { | |
| this.onTouched(); | |
| } | |
| // will be called if a values comes in via ngModule ! | |
| writeValue (innerHTML: string = ''): void { | |
| const sanitizedHTML = this.domSanitizer.sanitize(SecurityContext.HTML, innerHTML); | |
| this.renderer.setElementProperty(this.elementRef.nativeElement, 'innerHTML', sanitizedHTML); | |
| } | |
| registerOnChange(fn: OnChangeFn): void { | |
| this.onChange = fn; | |
| } | |
| registerOnTouched(fn: OnTouchFn): void { | |
| this.onTouched = fn; | |
| } | |
| } |
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