uchaindb/UClient

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

@Directive({
    selector: '[OnlyNumber]'
})
export class OnlyNumberDirective {

    constructor(private el: ElementRef) { }

    @Input() OnlyNumber: boolean;

    @HostListener('keydown', ['$event']) onKeyDown(event) {
        let e = <KeyboardEvent>event;
        if (this.OnlyNumber) {
            if ([46, 8, 9, 27, 13, 110, 190].indexOf(e.keyCode) !== -1 ||
                // Allow: Ctrl+A
                (e.keyCode === 65 && (e.ctrlKey || e.metaKey)) ||
                // Allow: Ctrl+C
                (e.keyCode === 67 && (e.ctrlKey || e.metaKey)) ||
                // Allow: Ctrl+V
                (e.keyCode === 86 && (e.ctrlKey || e.metaKey)) ||
                // Allow: Ctrl+X
                (e.keyCode === 88 && (e.ctrlKey || e.metaKey)) ||
                // Allow: home, end, left, right
                (e.keyCode >= 35 && e.keyCode <= 39)) {
                // 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();
            }
        }
    }
}