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true false value directive

This commit is contained in:
Kyle Spearrin 2018-06-06 14:29:59 -04:00
parent c5fbea2341
commit a7a58ae8f3

View File

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import {
Directive,
ElementRef,
forwardRef,
HostListener,
Input,
Renderer2,
} from '@angular/core';
import {
ControlValueAccessor,
NG_VALUE_ACCESSOR,
NgControl,
} from '@angular/forms';
// ref: https://juristr.com/blog/2018/02/ng-true-value-directive/
@Directive({
selector: 'input[type=checkbox][appTrueFalseValue]',
providers: [
{
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => TrueFalseValueDirective),
multi: true,
},
],
})
export class TrueFalseValueDirective implements ControlValueAccessor {
@Input() trueValue = true;
@Input() falseValue = false;
constructor(private elementRef: ElementRef, private renderer: Renderer2) { }
@HostListener('change', ['$event'])
onHostChange(ev: any) {
this.propagateChange(ev.target.checked ? this.trueValue : this.falseValue);
}
writeValue(obj: any): void {
if (obj === this.trueValue) {
this.renderer.setProperty(this.elementRef.nativeElement, 'checked', true);
} else {
this.renderer.setProperty(this.elementRef.nativeElement, 'checked', false);
}
}
registerOnChange(fn: any): void {
this.propagateChange = fn;
}
registerOnTouched(fn: any): void { /* nothing */ }
setDisabledState?(isDisabled: boolean): void { /* nothing */ }
private propagateChange = (_: any) => { /* nothing */ };
}