Angular6:如何限制材质输入中的特殊字符

Question

我有一个物质输入控件,我在用户输入时限制了特殊字符,但是在任何编辑器中键入一些单词并复制并粘贴具有特殊字符的单词时,这是不起作用的.

我已经编写了指令来防止特殊字符,但可以在复制粘贴中提供更好的解决方案限制.

app.component.html:

<form class="example-form">
  <mat-form-field class="example-full-width">
    <input matInput specialIsAlphaNumeric placeholder="Favorite food" value="Sushi">
  </mat-form-field>

  <mat-form-field class="example-full-width">
    <textarea matInput placeholder="Leave a comment"></textarea>
  </mat-form-field>
</form>

指示:

import { Directive, HostListener, Input } from '@angular/core';
@Directive({
    selector: '[specialIsAlphaNumeric]'
})
export class SpecialCharacterDirective {

    regexStr = '^[a-zA-Z0-9_]*$';
    @Input() isAlphaNumeric: boolean;

    @HostListener('keypress', ['$event']) onKeyPress(event) {
        return new RegExp(this.regexStr).test(event.key);
    }

}

演示见这里:

https://stackblitz.com/edit/angular-cijbqy-biwrck?file=app%2Finput-overview-e[stackblit

重现步骤:

输入不允许的特殊字符:工作正常.而复制粘贴机智允许特殊字符

Answer 1

试试这样:

stackblitz的例子

import { Directive, HostListener, ElementRef, Input } from '@angular/core';
@Directive({
  selector: '[specialIsAlphaNumeric]'
})
export class SpecialCharacterDirective {

  regexStr = '^[a-zA-Z0-9_]*$';
  @Input() isAlphaNumeric: boolean;

  constructor(private el: ElementRef) { }


  @HostListener('keypress', ['$event']) onKeyPress(event) {
    return new RegExp(this.regexStr).test(event.key);
  }

  @HostListener('paste', ['$event']) blockPaste(event: KeyboardEvent) {
    this.validateFields(event);
  }

  validateFields(event) {
    setTimeout(() => {

      this.el.nativeElement.value = this.el.nativeElement.value.replace(/[^A-Za-z ]/g, '').replace(/\s/g, '');
      event.preventDefault();

    }, 100)
  }

}