在来自浏览器的输入中检测 Ctrl + C 和 Ctrl + V

Question

我正在使用直接跟随，我没有检测到输入内的键的复制和粘贴，有人知道吗？谢谢！

export class OnlyNumberDirective {
    // Allow decimal numbers. The \, is only allowed once to occur
    private regex: RegExp = new RegExp(/[0-9]+(\,[0-9]{0,1}){0,1}$/g);

    // Allow key codes for special events. Reflect :
    // Backspace, tab, end, home
    private specialKeys: Array<string> = [ 'Backspace', 'Tab', 'End', 'Home', 'Delete', 'Del', 'Ctrl', 'ArrowLeft', 'ArrowRight', 'Left', 'Right' ];

    constructor(private el: ElementRef) {
    }

    @HostListener('keydown', [ '$event' ])
    onKeyDown(event: KeyboardEvent): string {
        // Allow Backspace, tab, end, and home keys
        if (this.specialKeys.indexOf(event.key) !== -1) {
            return null;
        }

        // Do not use event.keycode this is deprecated.
        // See: https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode
        let current: string = this.el.nativeElement.value;
        // We need this because the current value on the DOM element
        // is not yet updated with the value from this event
        let next: string = current.concat(event.key);
        if (next && !String(next).match(this.regex)) {
            event.preventDefault();
            return null;
        } else {
            return next;
        }
    }
}

Answer 1

您可以简单地执行谁：此代码管理所有使用 CMD 而不是 ctrl 的 mac 用户

@HostListener('window:keydown',['$event'])
onKeyPress($event: KeyboardEvent) {
    if(($event.ctrlKey || $event.metaKey) && $event.keyCode == 67)
        console.log('CTRL + C');
    if(($event.ctrlKey || $event.metaKey) && $event.keyCode == 86)
        console.log('CTRL +  V');
}

如果您想检测其他类型的快捷方式：

• event.ctrlKey
• event.altKey
• event.metaKey（Mac 用户的又名 Cmd）

Online sample

--- 评论后更新 ---

你可以这样做

  ngOnInit() {
        this.bindKeypressEvent().subscribe(($event: KeyboardEvent) => this.onKeyPress($event));
    }

    onKeyPress($event: KeyboardEvent) {
        if(($event.ctrlKey || $event.metaKey) && $event.keyCode == 67)
            console.log('CTRL + C');
        if(($event.ctrlKey || $event.metaKey) && $event.keyCode == 86)
            console.log('CTRL +  V');
    }

    private bindKeypressEvent(): Observable<KeyboardEvent> {
        const eventsType$ = [
            fromEvent(window, 'keypress'),
            fromEvent(window, 'keydown')
        ];
        // we merge all kind of event as one observable.
        return merge(...eventsType$)
            .pipe(
                // We prevent multiple next by wait 10ms before to next value.
                debounce(() => timer(10)),
                // We map answer to KeyboardEvent, typescript strong typing...
                map(state => (state as KeyboardEvent))
            );
    }

或者如果不工作，只是：

private bindKeypress(): Observable<KeyboardEvent> {
    const typeOfEvent = this.deviceService.getKeybordEvent();
    fromEvent(window, typeOfEvent)
    .pipe(
        // We map answer to KeyboardEvent, typescript strong typing...
        map(state => (state as KeyboardEvent))
    );
}

其中this.deviceService.getKeybordEvent(); 是返回基于用户代理的事件类型的方法。 massive list of user agent can be find here

Answer 2

Angular 提供了用于监听按键组合的高级 API。看看下面的例子。

ctrl-keys.directive.ts

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

@Directive({
  selector: '[ctrlKeys]',
})
export class CtrlKeysDirective  {
  @Output() ctrlV = new EventEmitter();
  @Output() ctrlC = new EventEmitter();

  @HostListener('keydown.control.v') onCtrlV() {
    this.ctrlV.emit();
  }

  @HostListener('keydown.control.c') onCtrlC() {
    this.ctrlC.emit();
  }
}

用法

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `
  <input ctrlKeys (ctrlV)="onCtrlV()" (ctrlC)="onCtrlC()" >
  `,
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  onCtrlV() {
    console.log('ctrlV pressed')
  }

  onCtrlC() {
    console.log('ctrlC pressed')
  }
}

Live demo

Answer 3

只需将此添加到任何组件。当用户执行组合键 Ctrl +s 时，它将打印“Save Performed”

@HostListener('document:keydown.control.s', ['$event']) onKeydownHandler(event: KeyboardEvent) {
    console.log('Save Performed');
    event.preventDefault();
}

如果你想要 Ctrl +v 将 'document:keydown.control.s' 中的 's' 替换为 'v'。

Answer 4

我建议不要监视复制和粘贴命令的关键事件，而是处理剪贴板事件（copy、cut、paste）。除了照顾不同平台上使用的各种快捷方式外，它还检测使用上下文菜单启动的剪贴板操作。请注意paste 事件可以用e.preventDefault() 取消。您可以在this stackblitz 中查看代码。

@HostListener('copy', ['$event'])
onCopy(e: ClipboardEvent) {
  ...
}

@HostListener('paste', ['$event'])
onPaste(e: ClipboardEvent) {
  let clipboardData = e.clipboardData || window.clipboardData;
  let pastedText = clipboardData.getData('text');
  ...
}

Answer 5

首先导入 HostListener 并创建监听 keyup 事件的方法。 也使用 ctrlKey 因为 keycode 已弃用。

import { HostListener} from '@angular/core';

    @HostListener('window:keyup', ['$event'])
       keyEvent(event: KeyboardEvent) {
          if (event.ctrlKey) {
              if (event.key === 'c') {
                 console.log('ctrl c');         
              }      
             else if (event.key === 'v') {
                 console.log('ctrl v')
              }
      }

Answer 6

@HostListener('document:keydown.control.c', ['$event'])
    onKeyDown(e) {
        e.preventDefault();
    }

@HostListener('document:keydown.control.v', ['$event'])
    onKeyDown(e) {
        e.preventDefault();
    }