如何使用自定义验证的角度反应形式
问题描述:
我已经定义了一个自定义的验证像下面如何使用自定义验证的角度反应形式
import { Directive, forwardRef } from '@angular/core';
import { NG_VALIDATORS, FormControl } from '@angular/forms';
function validateRewardAmountFactory(goalAmount: number, quantity: number) {
return (c: FormControl) => {
const rewardAmount = c.value;
const isValidAmount = rewardAmount * quantity < goalAmount ? true : false;
return isValidAmount ? null : { validateAmount: true };
};
}
@Directive({
selector: '[validateAmount][ngControl][validateAmount][ngModel],[validateAmount][ngFormControl]',
providers: [
{ provide: NG_VALIDATORS, useExisting: forwardRef(() => RewardAmountValidator), multi: true }
]
})
export class RewardAmountValidator {
validator: Function;
constructor(goalAmount: number, quantity: number) {
this.validator = validateRewardAmountFactory(goalAmount, quantity);
}
validate(c: FormControl) {
return this.validator(c);
}
}
,然后我有我的模块中声明该指令
@NgModule({
declarations: [RewardAmountValidator, ...]
})
现在我想用这个在我的反应形式自定义的验证,我做这样的
return this.fb.group({
'id': [project.id, Validators.required],
'type': ['reward', Validators.required],
'rewardAmount': ['', validateAmount(this.goalAmount, this.quantity)]
});
}
,但它给我的错误Cannot find name 'validateAmount'
那么,什么是使用自定义验证我的反应形式的正确方法。
答
试试这个:
return this.fb.group({
'id': [project.id, Validators.required],
'type': ['reward', Validators.required],
'rewardAmount': ['', Validators.compose(validateAmount(this.goalAmount, this.quantity))]
});
http://*.com/questions/31788681/angular2-validator-which-relies-on-multiple-form-fields –