Question

我正在尝试使用指令创建自定义验证程序，但收到以下错误。

ERROR in ./src/app/CustomValidators/white-space-validator.directive.ts
Module not found: Error: Can't resolve '@angular/forms/src/validators' in 'D:\Angular\Admin\src\app\CustomValidators'
resolve '@angular/forms/src/validators' in 'D:\Angular\Admin\src\app\CustomValidators'
  Parsed request is a module
  using description file: D:\Angular\Admin\package.json (relative path: ./src/app/CustomValidators)
    Field 'browser' doesn't contain a valid alias configuration
  after using description file: D:\Angular\Admin\package.json (relative path: ./src/app/CustomValidators)
    resolve as module.....

指令文件中的代码：

import { Directive } from '@angular/core';
import { ValidatorFn, Validator } from '@angular/forms/src/directives/validators';
import { AbstractControl, FormControl } from '@angular/forms/src/model';
import { NG_VALIDATORS } from '@angular/forms/src/validators';

@Directive({
  selector: '[whiteSpace][ngModel]',
  providers: [
    { provide: NG_VALIDATORS, useExisting: WhiteSpaceValidatorDirective, multi: true }
  ]
})

export class WhiteSpaceValidatorDirective  {
  validator : ValidatorFn;

  constructor() { 
    this.validator = checkWhiteSpaces();
  }

  validate(c: FormControl){
    return this.validator(c);
  }
}

function checkWhiteSpaces(): ValidatorFn {
  return (c: AbstractControl) => {
    let isValid = c.value.trim().length > 0 ? true : false;
    if (isValid) {
      return null;
    }
    else {
      return {
        whiteSpace: { valid: false }
      }
    }
  }
}

我正在使用的软件包版本：

Angular CLI：1.5.5节点：8.2.1操作系统：win32 x64 Angular：5.1.2 ...动画，通用，编译器，编译器 - cli，核心，表单... http，
  语言服务，平台浏览器......平台浏览器动态，
  路由器      @ angular / cli：1.5.5 @ angular-devkit / build-optimizer：0.0.36 @ angular-devkit / core：0.0.22 @ angular-devkit / schematics：0.0.42
  @ ngtools / json-schema：1.1.0 @ ngtools / webpack：1.8.5
  @ schematics / angular：0.1.11 @ schematics / schematics：0.0.11
  打字稿：2.4.2 webpack：3.8.1

任何帮助？

Answer 1

仅从@angular/forms

导入

import { 
      ValidatorFn,
      Validator, 
      AbstractControl, 
      FormControl, 
      NG_VALIDATORS 
} from '@angular/forms';

Angular 5：找不到模块：错误：无法解析'@ angular / forms / src / validators'

1 个答案: