Question

我想用这些数字做输入，但是如果我把输入的类型放到文本中我就不会到达我可以放5个字符的字母数字，如果我把输入的类型放到数字我只能放数字但是它不限于5个数字谢谢大家

HTML

<input type="text" id="number" name="postalCode" placeholder="Saisissez le code postal" formControlName="postalCode" maxlength="5" class="a-textbox"  pattern="/^(([0-8][0-9])|(9[0-5]))[0-9]{3}$/" />

角

postalCode: new FormControl('', [Validators.maxLength(5)]),

Answer 1

您可以尝试此解决方案

我在stackblitz

上创建了一个演示

html代码

<input type="text" OnlyNumber id="number" name="postalCode" placeholder="Saisissez le code postal" formControlName="postalCode" maxlength="5" class="a-textbox" />

OnlyNumber属性指令

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

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

    constructor(private el: ElementRef) { }

    @HostListener('keydown', ['$event']) onKeyDown(event: KeyboardEvent) {
        let e = <KeyboardEvent>event;
        /* 
            8 -  for backspace
            9 -  for tab
            13 - for enter
            27 - for escape
            46 - for delete
        */
        if ([8, 9, 13, 27, 46].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();
        }
    }

    @HostListener('paste', ['$event']) blockPaste(event: KeyboardEvent) {
        this.validateFields(event);
    }
    validateFields(event) {
        setTimeout(() => {
            let numberRegEx = /^[0-9]+$/;
            if(!numberRegEx.test(this.el.nativeElement.value)){
                this.el.nativeElement.value = "";
                event.preventDefault();
            }
        }, 100)
    }
}

Answer 2

该指令对我来说效果很好，并且具有将其强制为 5 位并排除数字相关字符（例如句点、“e”等）所需的一切。我建议将输入也保留为文本类型，请参阅此处的推理。 Digit Only Directive in Angular

Angular DigitOnly 指令和掩码指令 https://github.com/changhuixu/ngx-digit-only

邮政编码输入只有数字（限5）l Angular 4/5

2 个答案: