Angular 8输入验证仅接受数字 [英] Angular 8 Input validation accept only numbers

问题描述

我正在创建动态输入字段，它将接受所有类型的值.我只需要限制输入数字即可.

I'm creating dynamic input field it will accept all type values. I need to restrict only numbers to be enter.

模板:

<tr  *ngFor="let item of rowData">
    <ng-container *ngFor="let hitem of columnDefs" >
      <td *ngIf="!hitem.dropdown; else selectDrop">
        <span *ngIf="hitem.edit;else content">
          <div *ngIf="editing">
          <input [required]="required"  [name]="item[hitem.field]" [(ngModel)]="item[hitem.field]" />
          </div>
          <div *ngIf="!editing">
            {{item[hitem.field]}}
          </div>
        </span>
      <ng-template #content>content here... {{item[hitem.field]}} </ng-template>
      </td>
      <ng-template #selectDrop>
        <td>
          <select [(ngModel)]="item[hitem.field]">
            <option *ngFor="let item of aplAry">{{item}}</option>
          </select>
        </td>
      </ng-template>
      </ng-container>
  </tr>

数据:

mainHead = [{name:'', colspan:1}, {name:'Deatils', colspan:2}]
columnDefs = [
        {headerName: 'Make', field: 'make', edit:true },
        {headerName: 'Model', field: 'model', dropdown: true },
        {headerName: 'Price', field: 'price', edit:true}
];
aplAry = ['Celica','Mondeo','Boxter'];
    rowData = [
        { make: 'Toyota', model: 'Celica', price: 35000 },
        { make: 'Ford', model: 'Mondeo', price: 32000 },
        { make: 'Porsche', model: 'Boxter', price: 72000 }
];

Stackblitz示例

推荐答案

您只能为 number 创建一个自定义指令. Stackblitz演示

You can create a custom directive for only number. Stackblitz Demo

app.component.html

app.component.html

<input type="text" appOnlynumber/>

onlynumber.directive.ts

onlynumber.directive.ts

import { Directive, ElementRef, HostListener } from '@angular/core';

@Directive({
  selector: '[appOnlynumber]'
})
export class OnlynumberDirective {

  private navigationKeys = [
    'Backspace',
    'Delete',
    'Tab',
    'Escape',
    'Enter',
    'Home',
    'End',
    'ArrowLeft',
    'ArrowRight',
    'Clear',
    'Copy',
    'Paste'
  ];
  inputElement: HTMLElement;
  constructor(public el: ElementRef) {
    this.inputElement = el.nativeElement;
  }

  @HostListener('keydown', ['$event'])
  onKeyDown(e: KeyboardEvent) {
    if (
      this.navigationKeys.indexOf(e.key) > -1 || // Allow: navigation keys: backspace, delete, arrows etc.
      (e.key === 'a' && e.ctrlKey === true) || // Allow: Ctrl+A
      (e.key === 'c' && e.ctrlKey === true) || // Allow: Ctrl+C
      (e.key === 'v' && e.ctrlKey === true) || // Allow: Ctrl+V
      (e.key === 'x' && e.ctrlKey === true) || // Allow: Ctrl+X
      (e.key === 'a' && e.metaKey === true) || // Allow: Cmd+A (Mac)
      (e.key === 'c' && e.metaKey === true) || // Allow: Cmd+C (Mac)
      (e.key === 'v' && e.metaKey === true) || // Allow: Cmd+V (Mac)
      (e.key === 'x' && e.metaKey === true) // Allow: Cmd+X (Mac)
    ) {
      // let it happen, don't do anything
      return;
    }
    // Ensure that it is a number and stop the keypress
    if (
      (e.shiftKey || (e.keyCode < 48 || e.keyCode > 57)) &&
      (e.keyCode < 96 || e.keyCode > 105)
    ) {
      e.preventDefault();
    }
  }

  @HostListener('paste', ['$event'])
  onPaste(event: ClipboardEvent) {
    event.preventDefault();
    const pastedInput: string = event.clipboardData
      .getData('text/plain')
      .replace(/\D/g, ''); // get a digit-only string
    document.execCommand('insertText', false, pastedInput);
  }

  @HostListener('drop', ['$event'])
  onDrop(event: DragEvent) {
    event.preventDefault();
    const textData = event.dataTransfer.getData('text').replace(/\D/g, '');
    this.inputElement.focus();
    document.execCommand('insertText', false, textData);
  }


}

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