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import {AfterViewInit, Directive, ElementRef, forwardRef, Input} from '@angular/core';
import {AbstractControl, NG_VALIDATORS, ValidatorFn, Validators} from '@angular/forms';
import {NumberWrapperParseFloat} from '../core/number-wrapper-parse';
@Directive({
selector: '[min][ngModel],[min][formControl],[min][formControlName]',
providers: [{
provide: NG_VALIDATORS,
useExisting: forwardRef(() => MinValidatorDirective),
multi: true
}],
})
export class MinValidatorDirective implements AfterViewInit {
private _validator: ValidatorFn;
private inputElement: any;
constructor(elementRef: ElementRef) {
this.inputElement = elementRef;
}
ngAfterViewInit() {
this.inputElement = this.inputElement.nativeElement.querySelector('input');
if (this.inputElement && this.inputElement.querySelector('input')) {
this._validator = min(NumberWrapperParseFloat(
this.inputElement.querySelector('input').getAttribute('min')));
}
}
@Input()
set min(minValue: string) {
this._validator = min(NumberWrapperParseFloat(minValue));
}
validate(c: AbstractControl): {[key: string]: any} {
return this._validator(c);
}
}
function min(minvalue: number): ValidatorFn {
return (control: AbstractControl): {[key: string]: any} => {
if (Validators.required(control) !== undefined &&
Validators.required(control) !== null) {
return null;
}
let v: Number = Number(control.value);
return v < minvalue ?
{'min': {'requiredValue': minvalue, 'actualValue': v}} :
null;
};
}
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