格式化输入的电话号码成角度 [英] Formatting Phone Number Input In Angular
本文介绍了格式化输入的电话号码成角度的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我已经看到了许多在Angularjs中格式化电话号码输入字段的解决方案,但是我在Angular 7上找不到任何东西.我的主要目的是让用户在文本字段中键入以下内容:
I have seen many solutions to formatting a phone number input field in Angularjs, but I cannot find anything on Angular 7. What I essentially want is for the user to type the following in the textfield:
123456789
123456789
,并使文本字段将输入的格式设置为:
and for the textfield to format the input as:
(123)456-789
(123) 456-789
我该怎么做?我发现以下正则表达式可以对其进行验证:
how can I go about doing this? I have found the following regex to validate it:
^(\([0-9]{3}\) |[0-9]{3}-)[0-9]{3}-[0-9]{4}$
推荐答案
您可以通过以下的电话屏蔽指令来处理此问题,
You can handle this with a Phone Mask Directive as follows,
export class PhoneMaskDirective {
constructor(public ngControl: NgControl) { }
@HostListener('ngModelChange', ['$event'])
onModelChange(event) {
this.onInputChange(event, false);
}
@HostListener('keydown.backspace', ['$event'])
keydownBackspace(event) {
this.onInputChange(event.target.value, true);
}
onInputChange(event, backspace) {
let newVal = event.replace(/\D/g, '');
if (backspace && newVal.length <= 6) {
newVal = newVal.substring(0, newVal.length - 1);
}
if (newVal.length === 0) {
newVal = '';
} else if (newVal.length <= 3) {
newVal = newVal.replace(/^(\d{0,3})/, '($1)');
} else if (newVal.length <= 6) {
newVal = newVal.replace(/^(\d{0,3})(\d{0,3})/, '($1) $2');
} else if (newVal.length <= 10) {
newVal = newVal.replace(/^(\d{0,3})(\d{0,3})(\d{0,4})/, '($1) $2-$3');
} else {
newVal = newVal.substring(0, 10);
newVal = newVal.replace(/^(\d{0,3})(\d{0,3})(\d{0,4})/, '($1) $2-$3');
}
this.ngControl.valueAccessor.writeValue(newVal);
}
}
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