本文介绍了以Angular2形式输入掩码字段的处理方法,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
是否可以在Angular 2中使用模型驱动的表单,并找到允许屏蔽输入字段的指令,例如电话号码输入
(123)123-4567
解决方案
原始
>一种方法是使用一个指令来注入 NgControl
并操纵值
(有关详情,请参阅内嵌评论) $ b
@Directive({
selector:'[ngModel] [phone]',
host:{$ b $'(ngModelChange)':'onInputChange($ event)',
'(keydown.backspace)':'onInputChange($ event.target.value,true)'
}
})
导出类PhoneMask {
构造函数(public model:NgControl ){}
onInputChange(event,backspace){
// remov e所有掩码字符(只保留数字)
var newVal = event.replace(/ \D / g,'');
//特殊处理退格空间否则
//删除非数字字符不被识别
//这是一个有待改进的空间,例如,如果您在
/ /字符串中间
if(backspace){
newVal = newVal.substring(0,newVal.length - 1);
}
//不显示空值大括号
if(newVal.length == 0){
newVal ='';
}
//不在末尾显示空组的大括号
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 {
newVal = newVal.replace(/ ^(\d {0,3})(\d {0,3})(。*)/,'($ 1)( $ 2) - $ 3' );
}
//设置新值
this.model.valueAccessor.writeValue(newVal);
code $
@Component({
selector:'my-app',
providers:[],
template:`
lt lt ;形成[ngFormModel] = 形式 >
将输入类型= 文本 电话[(ngModel)] = 数据 ngControl = 电话 >
将/形式>
`,
指令:[PhoneMask]
})
导出类应用程序{
构造函数(fb:FormBuilder){
this.form = fb.group ({
phone:['']
})
}
}
Is it possible to have model driven form in Angular 2 and find directive that would allow to mask input field like phone number entry(123) 123-4567
?
解决方案 original
One way you could do it is using a directive that injects NgControl
and manipulates the value
(for details see inline comments)
@Directive({
selector: '[ngModel][phone]',
host: {
'(ngModelChange)': 'onInputChange($event)',
'(keydown.backspace)': 'onInputChange($event.target.value, true)'
}
})
export class PhoneMask {
constructor(public model: NgControl) {}
onInputChange(event, backspace) {
// remove all mask characters (keep only numeric)
var newVal = event.replace(/\D/g, '');
// special handling of backspace necessary otherwise
// deleting of non-numeric characters is not recognized
// this laves room for improvement for example if you delete in the
// middle of the string
if (backspace) {
newVal = newVal.substring(0, newVal.length - 1);
}
// don't show braces for empty value
if (newVal.length == 0) {
newVal = '';
}
// don't show braces for empty groups at the end
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 {
newVal = newVal.replace(/^(\d{0,3})(\d{0,3})(.*)/, '($1) ($2)-$3');
}
// set the new value
this.model.valueAccessor.writeValue(newVal);
}
}
@Component({
selector: 'my-app',
providers: [],
template: `
<form [ngFormModel]="form">
<input type="text" phone [(ngModel)]="data" ngControl="phone">
</form>
`,
directives: [PhoneMask]
})
export class App {
constructor(fb: FormBuilder) {
this.form = fb.group({
phone: ['']
})
}
}
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