javascript - 数字和小数值的 Angular 2 自定义验证

Question

我有一个自定义验证器，用于检查输入字段中是否输入了数字。

代码如下所示:

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

export class NumberValidators {

  static isNumberCheck(): ValidatorFn {
    return  (c: AbstractControl): {[key: string]: boolean} | null => {
      if (c.value !== undefined && (isNaN(c.value))) {
        return { 'value': true };
      }

      return null;
    };
  }
}

但我遇到的问题是，当我输入一个十进制值时，它会引发我不想要的验证标志。我希望输入字段包含整数和小数。有人可以帮我解决这个问题吗？

下面是我使用parsleyjs验证的模板代码

<div class="form-group row">
              <label for="upperbeltposition" class="col-md-6 col-form-label">Upper Belt Position (mm) <span class="required">*</span></label>
              <div class="col-md-5">
                <input class="form-control input-transparent " id="upperbeltposition" type="text" formControlName="upperbeltposition"  data-parsley-trigger="blur"
                  required="required" data-parsley-type="number"/>
              </div>
            </div>
             <div class="form-group row">
              <label for="platformxposition" class="col-md-6 col-form-label">Platform X Position (mm) <span class="required">*</span></label>
              <div class="col-md-5">
                <input class="form-control input-transparent " id="platformxposition" type="text" formControlName="platformxposition"  data-parsley-trigger="blur"
                  required="required" data-parsley-type="number"/>
              </div>
            </div>
             <div class="form-group row">
              <label for="platformyposition" class="col-md-6 col-form-label">Platform Y Position (mm) <span class="required">*</span></label>
              <div class="col-md-5">
                <input class="form-control input-transparent " id="platformyposition" type="text" formControlName="platformyposition"  data-parsley-trigger="blur"
                  required="required" data-parsley-type="number"/>
              </div>
            </div>

在我的组件中，我使用的是响应式表单，下面是我的代码

upperbeltposition: ['', [Validators.required, NumberValidators.isNumberCheck]],
platformxposition: ['', [Validators.required, NumberValidators.isNumberCheck]],
platformyposition: ['', [Validators.required, NumberValidators.isNumberCheck]]

谢谢!!

Answer 1

像这样的东西应该可以工作

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

export class NumberValidators {

  static isNumberCheck(): ValidatorFn {
    return  (c: AbstractControl): {[key: string]: boolean} | null => {
      let number = /^[.\d]+$/.test(c.value) ? +c.value : NaN;
      if (number !== number) {
        return { 'value': true };
      }

      return null;
    };
  }
}