Validation 将输入类型编号限制为角度2的小数点后2位
我在html页面上有许多输入框。我想限制用户输入2位小数后的任何数字 目前尝试应用HTML5输入步骤=“0.00”,但不起作用 任何类型脚本解决方案也可以Validation 将输入类型编号限制为角度2的小数点后2位,validation,angular,typescript,input,Validation,Angular,Typescript,Input,我在html页面上有许多输入框。我想限制用户输入2位小数后的任何数字 目前尝试应用HTML5输入步骤=“0.00”,但不起作用 任何类型脚本解决方案也可以 <input type='number' step='0.01' value='0.00' placeholder='0.00' /> 不要使用Step使用Step,如果您仍然想要旧浏览器的支持,您可以为相同的选择javascript代码。我使用@pipe获得了解决方案 import { Directive,Input,Inj
<input type='number' step='0.01' value='0.00' placeholder='0.00' />
不要使用
Step
使用Step
,如果您仍然想要旧浏览器的支持,您可以为相同的选择javascript代码。我使用@pipe获得了解决方案
import { Directive,Input,Inject, HostListener, ElementRef, OnInit } from "@angular/core";
const PADDING = "000000";
@Pipe({ name: "CurrencyPipe" })
export class CurrencyPipe implements PipeTransform {
transform(value: any, args: string[]): any {
var clean = value.replace(/[^-0-9\.]/g, '');
var negativeCheck = clean.split('-');
var decimalCheck = clean.split('.');
if (negativeCheck[1] != undefined) {
negativeCheck[1] = negativeCheck[1].slice(0, negativeCheck[1].length);
clean = negativeCheck[0] + '-' + negativeCheck[1];
if (negativeCheck[0].length > 0) {
clean = negativeCheck[0];
}
}
if (decimalCheck[1] != undefined) {
decimalCheck[1] = decimalCheck[1].slice(0, 2);
clean = decimalCheck[0] + '.' + decimalCheck[1];
}
return clean;
}
parse(value: string, fractionSize: number = 2): string {
var clean = value.replace(/[^-0-9\.]/g, '');
var negativeCheck = clean.split('-');
var decimalCheck = clean.split('.');
if (negativeCheck[1] != undefined) {
negativeCheck[1] = negativeCheck[1].slice(0, negativeCheck[1].length);
clean = negativeCheck[0] + '-' + negativeCheck[1];
if (negativeCheck[0].length > 0) {
clean = negativeCheck[0];
}
}
if (decimalCheck[1] != undefined) {
decimalCheck[1] = decimalCheck[1].slice(0, 2);
clean = decimalCheck[0] + '.' + decimalCheck[1];
}
return clean;
}
}
管道在我的指令中延伸
import { Directive, Input, Inject, HostListener, OnChanges, ElementRef, Renderer, AfterViewInit, OnInit } from "@angular/core";
import { CurrencyPipe } from '../../shared/pipe/orderby';
@Directive({ selector: "[CurrencyFormatter]" })
export class CurrencyFormatterDirective {
private el: HTMLInputElement;
constructor(
private elementRef: ElementRef,
private currencyPipe: CurrencyPipe
) {
this.el = this.elementRef.nativeElement;
}
ngOnInit() {
this.el.value = this.currencyPipe.parse(this.el.value);
}
@HostListener("focus", ["$event.target.value"])
onFocus(value) {
this.el.value = this.currencyPipe.parse(value); // opossite of transform
}
@HostListener("blur", ["$event.target.value"])
onBlur(value) {
this.el.value = this.currencyPipe.parse(value);
}
@HostListener("keyup", ["$event.target.value"])
onKeyUp(value) {
this.el.value = this.currencyPipe.parse(value);
}
}
组件上的导入指令
import { CurrencyFormatterDirective } from '../../shared/directive/showOnRowHover';
import { CurrencyPipe } from '../../shared/pipe/orderby';
providers: [CurrencyPipe,
CurrencyFormatterDirective]
在html输入上添加和指令
<input type="text" [(ngModel)]="invoiceDetail.InvoiceAmount" class="form-control" placeholder="Enter invoice amount"
CurrencyFormatter>
请参阅中的以下指令演示 您可以使用以下指令实现这一点:
import { Directive, ElementRef, HostListener, Input } from '@angular/core';
@Directive({
selector: '[OnlyNumber]'
})
export class OnlyNumber {
elemRef: ElementRef
constructor(private el: ElementRef) {
this.elemRef = el
}
@Input() OnlyNumber: boolean;
@Input() DecimalPlaces: string;
@Input() minValue: string;
@Input() maxValue: string;
@HostListener('keydown', ['$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 === true) ||
// Allow: Ctrl+C
(e.keyCode == 67 && e.ctrlKey === true) ||
// Allow: Ctrl+X
(e.keyCode == 88 && e.ctrlKey === true) ||
// 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('keypress', ['$event']) onKeyPress(event) {
let e = <any> event
let valInFloat: number = parseFloat(e.target.value)
if(this.minValue.length) {
// (isNaN(valInFloat) && e.key === "0") - When user enters value for first time valInFloat will be NaN, e.key condition is
// because I didn't want user to enter anything below 1.
// NOTE: You might want to remove it if you want to accept 0
if( valInFloat < parseFloat(this.minValue) || (isNaN(valInFloat) && e.key === "0") ) {
e.preventDefault();
}
}
if(this.maxValue.length) {
if(valInFloat > parseFloat(this.maxValue)) {
e.preventDefault();
}
}
if (this.DecimalPlaces) {
let currentCursorPos: number = -1;
if (typeof this.elemRef.nativeElement.selectionStart == "number") {
currentCursorPos = this.elemRef.nativeElement.selectionStart;
} else {
// Probably an old IE browser
console.log("This browser doesn't support selectionStart");
}
let dotLength: number = e.target.value.replace(/[^\.]/g, '').length
// If user has not entered a dot(.) e.target.value.split(".")[1] will be undefined
let decimalLength = e.target.value.split(".")[1] ? e.target.value.split(".")[1].length : 0;
// (this.DecimalPlaces - 1) because we don't get decimalLength including currently pressed character
// currentCursorPos > e.target.value.indexOf(".") because we must allow user's to enter value before dot(.)
// Checking Backspace etc.. keys because firefox doesn't pressing them while chrome does by default
if( dotLength > 1 || (dotLength === 1 && e.key === ".") || (decimalLength > (parseInt(this.DecimalPlaces) - 1) &&
currentCursorPos > e.target.value.indexOf(".")) && ["Backspace", "ArrowLeft", "ArrowRight"].indexOf(e.key) === -1 ) {
e.preventDefault();
}
}
}
}
import{Directive,ElementRef,HostListener,Input}来自“@angular/core”;
@指示({
选择器:“[OnlyNumber]”
})
仅导出类编号{
elemRef:ElementRef
构造函数(专用el:ElementRef){
this.elemRef=el
}
@Input()OnlyNumber:布尔值;
@Input()小数位数:字符串;
@Input()最小值:字符串;
@Input()最大值:字符串;
@HostListener('keydown',['$event'])onKeyDown(event){
设e=事件;
如果(此.OnlyNumber){
if([46,8,9,27,13,110,190]).indexOf(e.keyCode)!=-1||
//允许:Ctrl+A
(e.keyCode==65&&e.ctrlKey==true)||
//允许:Ctrl+C
(e.keyCode==67&&e.ctrlKey==true)||
//允许:Ctrl+X
(e.keyCode==88&&e.ctrlKey==true)||
//允许:起始、结束、左、右
(e.keyCode>=35&&e.keyCode不限制用户输入超过2位小数。在Chrome(版本58.0.3029.110)上,Angular 2.4.0-小数位数检查不起作用(this.elemRef.nativeElement.selectionStart为空)。但实际上,neat指令不是这样。谢谢。我使用Angular 4.0.0和Chrome 57.0.2987.133(64位)在OS X El Capitan上。我修复了一个firefox bug,现在它也可以在firefox v53上运行。如果您发现问题,请随时提出编辑建议workaround@Dhyey如果你输入一个小数点数字,然后选择或突出显示小数点后的最后一个数字,并尝试用另一个数字替换它,那么它将不起作用此函数用于作为跨浏览器解决方案获取光标位置。到目前为止,它对我很有效:var getCursorPosition=function(elem){var pos=0;if(document.selection){elem.focus();var sel=document.selection.createRange();sel.moveStart('character',-elem.value.length);pos=sel.text.length;}else if(elem.selectionStart | | elem.selectionStart=='0'){pos=elem.selectionStart;}返回pos;}
很抱歉,这种格式看起来很奇怪。注释不保留其格式。这很好,但我必须从core导入PipeTransform,并将管道作为提供程序添加到指令中以使其注入,并将其添加到模块的声明中
<input type="text" OnlyNumber="true" DecimalPlaces="2" minValue="1.00" maxValue="999999999.00">