我写了一个非常简单的表单控件验证器：
import { Directive } from '@angular/core';
import { AbstractControl,NG_VALIDATORS } from '@angular/forms';
function checkBoxrequiredValidator(c: AbstractControl) {
return c.value ? null : {
required: true
};
}
@Directive({
selector: '[checkBox-required-validator]',providers: [
{ provide: NG_VALIDATORS,multi: true,useValue: checkBoxrequiredValidator }
]
})
export class CheckBoxrequiredValidator {
}
我想传递一个消息参数给我,我可以返回.我试过这个,但它不起作用：
function checkBoxrequiredValidator(c: AbstractControl,msg) { return c.value ? null : { message: msg }; } @Directive({ selector: '[checkBox-required-validator]',useValue: checkBoxrequiredValidator } ] }) export class CheckBoxrequiredValidator { @Input('checkBox-required-validator') msg: = 'default message'; }
任何帮助,将不胜感激
您可以将指令本身作为验证器.这样您就可以使用消息输入.
import { forwardRef } from '@angular/core';
import { Validator } from '@angular/forms';
@Directive({
selector: '[checkBox-required-validator]',providers: [
{
provide: NG_VALIDATORS,useExisting: forwardRef(() => CheckBoxrequiredValidator )
}
]
})
export class CheckBoxrequiredValidator implements Validator {
@Input('checkBox-required-validator') msg = 'default message';
validate(c: AbstractControl) {
return c.value ? null : {
required: this.msg
};
}
}
