@uiowa/digit-only
Version:
This package includes two Angular directives. The digitOnly directive only allows numbers in the input box when typing, pasting or drag/dropping. The mask directive checks the input pattern attribute.
281 lines • 38 kB
JavaScript
import { Directive, HostListener, Input, } from '@angular/core';
import * as i0 from "@angular/core";
export class DigitOnlyDirective {
constructor(el) {
this.el = el;
this.hasDecimalPoint = false;
this.hasNegativeSign = false;
this.navigationKeys = [
'Backspace',
'Delete',
'Tab',
'Escape',
'Enter',
'Home',
'End',
'ArrowLeft',
'ArrowRight',
'Clear',
'Copy',
'Paste',
];
this.decimal = false;
this.decimalSeparator = '.';
this.allowNegatives = false;
this.allowPaste = true;
this.negativeSign = '-';
this.min = -Infinity;
this.max = Infinity;
this.regex = null;
this.inputElement = el.nativeElement;
}
ngOnChanges(changes) {
if (changes['pattern']) {
this.regex = this.pattern ? RegExp(this.pattern) : null;
}
if (changes['min']) {
const maybeMin = Number(this.min);
this.min = isNaN(maybeMin) ? -Infinity : maybeMin;
}
if (changes['max']) {
const maybeMax = Number(this.max);
this.max = isNaN(maybeMax) ? Infinity : maybeMax;
}
}
onBeforeInput(e) {
if (isNaN(Number(e.data))) {
if (e.data === this.decimalSeparator ||
(e.data === this.negativeSign && this.allowNegatives)) {
return; // go on
}
e.preventDefault();
e.stopPropagation();
}
}
onKeyDown(e) {
if (this.navigationKeys.indexOf(e.key) > -1 || // Allow: navigation keys: backspace, delete, arrows etc.
((e.key === 'a' || e.code === 'KeyA') && e.ctrlKey === true) || // Allow: Ctrl+A
((e.key === 'c' || e.code === 'KeyC') && e.ctrlKey === true) || // Allow: Ctrl+C
((e.key === 'v' || e.code === 'KeyV') && e.ctrlKey === true) || // Allow: Ctrl+V
((e.key === 'x' || e.code === 'KeyX') && e.ctrlKey === true) || // Allow: Ctrl+X
((e.key === 'a' || e.code === 'KeyA') && e.metaKey === true) || // Allow: Cmd+A (Mac)
((e.key === 'c' || e.code === 'KeyC') && e.metaKey === true) || // Allow: Cmd+C (Mac)
((e.key === 'v' || e.code === 'KeyV') && e.metaKey === true) || // Allow: Cmd+V (Mac)
((e.key === 'x' || e.code === 'KeyX') && e.metaKey === true) // Allow: Cmd+X (Mac)
) {
// let it happen, don't do anything
return;
}
let newValue = '';
if (this.decimal && e.key === this.decimalSeparator) {
newValue = this.forecastValue(e.key);
if (newValue.split(this.decimalSeparator).length > 2) {
// has two or more decimal points
e.preventDefault();
return;
}
else {
this.hasDecimalPoint = newValue.indexOf(this.decimalSeparator) > -1;
return; // Allow: only one decimal point
}
}
if (e.key === this.negativeSign && this.allowNegatives) {
newValue = this.forecastValue(e.key);
if (newValue.charAt(0) !== this.negativeSign ||
newValue.split(this.negativeSign).length > 2) {
e.preventDefault();
return;
}
else {
this.hasNegativeSign = newValue.split(this.negativeSign).length > -1;
return;
}
}
// Ensure that it is a number and stop the keypress
if (e.key === ' ' || isNaN(Number(e.key))) {
e.preventDefault();
return;
}
newValue = newValue || this.forecastValue(e.key);
// check the input pattern RegExp
if (this.regex) {
if (!this.regex.test(newValue)) {
e.preventDefault();
return;
}
}
const newNumber = Number(newValue);
if (newNumber > this.max || newNumber < this.min) {
e.preventDefault();
}
}
onPaste(event) {
if (this.allowPaste === true) {
let pastedInput = '';
if (window['clipboardData']) {
// Browser is IE
pastedInput = window['clipboardData'].getData('text');
}
else if (event.clipboardData && event.clipboardData.getData) {
// Other browsers
pastedInput = event.clipboardData.getData('text/plain');
}
this.pasteData(pastedInput);
event.preventDefault();
}
else {
// this prevents the paste
event.preventDefault();
event.stopPropagation();
}
}
onDrop(event) {
const textData = event.dataTransfer?.getData('text') ?? '';
this.inputElement.focus();
this.pasteData(textData);
event.preventDefault();
}
pasteData(pastedContent) {
const sanitizedContent = this.sanitizeInput(pastedContent);
if (sanitizedContent.includes(this.negativeSign) &&
this.hasNegativeSign &&
!this.getSelection().includes(this.negativeSign)) {
return;
}
const pasted = document.execCommand('insertText', false, sanitizedContent);
if (!pasted) {
if (this.inputElement.setRangeText) {
const { selectionStart: start, selectionEnd: end } = this.inputElement;
this.inputElement.setRangeText(sanitizedContent, start ?? 0, end ?? 0, 'end');
// Angular's Reactive Form relies on "input" event, but on Firefox, the setRangeText method doesn't trigger it
// so we have to trigger it ourself.
if (typeof window['InstallTrigger'] !==
'undefined') {
this.inputElement.dispatchEvent(new Event('input', { cancelable: true }));
}
}
else {
// Browser does not support setRangeText, e.g. IE
this.insertAtCursor(this.inputElement, sanitizedContent);
}
}
if (this.decimal) {
this.hasDecimalPoint =
this.inputElement.value.indexOf(this.decimalSeparator) > -1;
}
this.hasNegativeSign =
this.inputElement.value.indexOf(this.negativeSign) > -1;
}
// The following 2 methods were added from the below article for browsers that do not support setRangeText
// https://stackoverflow.com/questions/11076975/how-to-insert-text-into-the-textarea-at-the-current-cursor-position
insertAtCursor(myField, myValue) {
const startPos = myField.selectionStart ?? 0;
const endPos = myField.selectionEnd ?? 0;
myField.value =
myField.value.substring(0, startPos) +
myValue +
myField.value.substring(endPos, myField.value.length);
const pos = startPos + myValue.length;
myField.focus();
myField.setSelectionRange(pos, pos);
this.triggerEvent(myField, 'input');
}
triggerEvent(el, type) {
if ('createEvent' in document) {
// modern browsers, IE9+
const e = document.createEvent('HTMLEvents');
e.initEvent(type, false, true);
el.dispatchEvent(e);
}
}
// end stack overflow code
sanitizeInput(input) {
let result = '';
let regex;
if (this.decimal && this.isValidDecimal(input)) {
regex = new RegExp(`${this.getNegativeSignRegExp()}[^0-9${this.decimalSeparator}]`, 'g');
}
else {
regex = new RegExp(`${this.getNegativeSignRegExp()}[^0-9]`, 'g');
}
result = input.replace(regex, '');
const maxLength = this.inputElement.maxLength;
if (maxLength > 0) {
// the input element has maxLength limit
const allowedLength = maxLength -
this.inputElement.value.length +
(result.includes(`${this.negativeSign}`) ? 1 : 0);
result = allowedLength > 0 ? result.substring(0, allowedLength) : '';
}
return result;
}
getNegativeSignRegExp() {
return this.allowNegatives &&
(!this.hasNegativeSign || this.getSelection().includes(this.negativeSign))
? `(?!^${this.negativeSign})`
: '';
}
isValidDecimal(string) {
if (!this.hasDecimalPoint) {
return string.split(this.decimalSeparator).length <= 2;
}
else {
// the input element already has a decimal separator
const selectedText = this.getSelection();
if (selectedText && selectedText.indexOf(this.decimalSeparator) > -1) {
return string.split(this.decimalSeparator).length <= 2;
}
else {
return string.indexOf(this.decimalSeparator) < 0;
}
}
}
getSelection() {
return this.inputElement.value.substring(this.inputElement.selectionStart ?? 0, this.inputElement.selectionEnd ?? 0);
}
forecastValue(key) {
const selectionStart = this.inputElement.selectionStart ?? 0;
const selectionEnd = this.inputElement.selectionEnd ?? 0;
const oldValue = this.inputElement.value;
return (oldValue.substring(0, selectionStart) +
key +
oldValue.substring(selectionEnd));
}
}
DigitOnlyDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.2.4", ngImport: i0, type: DigitOnlyDirective, deps: [{ token: i0.ElementRef }], target: i0.ɵɵFactoryTarget.Directive });
DigitOnlyDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "12.0.0", version: "13.2.4", type: DigitOnlyDirective, selector: "[digitOnly]", inputs: { decimal: "decimal", decimalSeparator: "decimalSeparator", allowNegatives: "allowNegatives", allowPaste: "allowPaste", negativeSign: "negativeSign", min: "min", max: "max", pattern: "pattern" }, host: { listeners: { "beforeinput": "onBeforeInput($event)", "keydown": "onKeyDown($event)", "paste": "onPaste($event)", "drop": "onDrop($event)" } }, usesOnChanges: true, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.2.4", ngImport: i0, type: DigitOnlyDirective, decorators: [{
type: Directive,
args: [{
selector: '[digitOnly]',
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }]; }, propDecorators: { decimal: [{
type: Input
}], decimalSeparator: [{
type: Input
}], allowNegatives: [{
type: Input
}], allowPaste: [{
type: Input
}], negativeSign: [{
type: Input
}], min: [{
type: Input
}], max: [{
type: Input
}], pattern: [{
type: Input
}], onBeforeInput: [{
type: HostListener,
args: ['beforeinput', ['$event']]
}], onKeyDown: [{
type: HostListener,
args: ['keydown', ['$event']]
}], onPaste: [{
type: HostListener,
args: ['paste', ['$event']]
}], onDrop: [{
type: HostListener,
args: ['drop', ['$event']]
}] } });
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el.nativeElement;\r\n  }\r\n\r\n  ngOnChanges(changes: SimpleChanges): void {\r\n    if (changes['pattern']) {\r\n      this.regex = this.pattern ? RegExp(this.pattern) : null;\r\n    }\r\n\r\n    if (changes['min']) {\r\n      const maybeMin = Number(this.min);\r\n      this.min = isNaN(maybeMin) ? -Infinity : maybeMin;\r\n    }\r\n\r\n    if (changes['max']) {\r\n      const maybeMax = Number(this.max);\r\n      this.max = isNaN(maybeMax) ? Infinity : maybeMax;\r\n    }\r\n  }\r\n\r\n  @HostListener('beforeinput', ['$event'])\r\n  onBeforeInput(e: InputEvent): any {\r\n    if (isNaN(Number(e.data))) {\r\n      if (\r\n        e.data === this.decimalSeparator ||\r\n        (e.data === this.negativeSign && this.allowNegatives)\r\n      ) {\r\n        return; // go on\r\n      }\r\n      e.preventDefault();\r\n      e.stopPropagation();\r\n    }\r\n  }\r\n\r\n  @HostListener('keydown', ['$event'])\r\n  onKeyDown(e: KeyboardEvent): any {\r\n    if (\r\n      this.navigationKeys.indexOf(e.key) > -1 || // Allow: navigation keys: backspace, delete, arrows etc.\r\n      ((e.key === 'a' || e.code === 'KeyA') && e.ctrlKey === true) || // Allow: Ctrl+A\r\n      ((e.key === 'c' || e.code === 'KeyC') && e.ctrlKey === true) || // Allow: Ctrl+C\r\n      ((e.key === 'v' || e.code === 'KeyV') && e.ctrlKey === true) || // Allow: Ctrl+V\r\n      ((e.key === 'x' || e.code === 'KeyX') && e.ctrlKey === true) || // Allow: Ctrl+X\r\n      ((e.key === 'a' || e.code === 'KeyA') && e.metaKey === true) || // Allow: Cmd+A (Mac)\r\n      ((e.key === 'c' || e.code === 'KeyC') && e.metaKey === true) || // Allow: Cmd+C (Mac)\r\n      ((e.key === 'v' || e.code === 'KeyV') && e.metaKey === true) || // Allow: Cmd+V (Mac)\r\n      ((e.key === 'x' || e.code === 'KeyX') && e.metaKey === true) // Allow: Cmd+X (Mac)\r\n    ) {\r\n      // let it happen, don't do anything\r\n      return;\r\n    }\r\n\r\n    let newValue = '';\r\n\r\n    if (this.decimal && e.key === this.decimalSeparator) {\r\n      newValue = this.forecastValue(e.key);\r\n      if (newValue.split(this.decimalSeparator).length > 2) {\r\n        // has two or more decimal points\r\n        e.preventDefault();\r\n        return;\r\n      } else {\r\n        this.hasDecimalPoint = newValue.indexOf(this.decimalSeparator) > -1;\r\n        return; // Allow: only one decimal point\r\n      }\r\n    }\r\n\r\n    if (e.key === this.negativeSign && this.allowNegatives) {\r\n      newValue = this.forecastValue(e.key);\r\n      if (\r\n        newValue.charAt(0) !== this.negativeSign ||\r\n        newValue.split(this.negativeSign).length > 2\r\n      ) {\r\n        e.preventDefault();\r\n        return;\r\n      } else {\r\n        this.hasNegativeSign = newValue.split(this.negativeSign).length > -1;\r\n        return;\r\n      }\r\n    }\r\n\r\n    // Ensure that it is a number and stop the keypress\r\n    if (e.key === ' ' || isNaN(Number(e.key))) {\r\n      e.preventDefault();\r\n      return;\r\n    }\r\n\r\n    newValue = newValue || this.forecastValue(e.key);\r\n    // check the input pattern RegExp\r\n    if (this.regex) {\r\n      if (!this.regex.test(newValue)) {\r\n        e.preventDefault();\r\n        return;\r\n      }\r\n    }\r\n\r\n    const newNumber = Number(newValue);\r\n    if (newNumber > this.max || newNumber < this.min) {\r\n      e.preventDefault();\r\n    }\r\n  }\r\n\r\n  @HostListener('paste', ['$event'])\r\n  onPaste(event: any): void {\r\n    if (this.allowPaste === true) {\r\n      let pastedInput: string = '';\r\n      if ((window as { [key: string]: any })['clipboardData']) {\r\n        // Browser is IE\r\n        pastedInput = (window as { [key: string]: any })[\r\n          'clipboardData'\r\n        ].getData('text');\r\n      } else if (event.clipboardData && event.clipboardData.getData) {\r\n        // Other browsers\r\n        pastedInput = event.clipboardData.getData('text/plain');\r\n      }\r\n\r\n      this.pasteData(pastedInput);\r\n      event.preventDefault();\r\n    } else {\r\n      // this prevents the paste\r\n      event.preventDefault();\r\n      event.stopPropagation();\r\n    }\r\n  }\r\n\r\n  @HostListener('drop', ['$event'])\r\n  onDrop(event: DragEvent): void {\r\n    const textData = event.dataTransfer?.getData('text') ?? '';\r\n    this.inputElement.focus();\r\n    this.pasteData(textData);\r\n    event.preventDefault();\r\n  }\r\n\r\n  private pasteData(pastedContent: string): void {\r\n    const sanitizedContent = this.sanitizeInput(pastedContent);\r\n    if (\r\n      sanitizedContent.includes(this.negativeSign) &&\r\n      this.hasNegativeSign &&\r\n      !this.getSelection().includes(this.negativeSign)\r\n    ) {\r\n      return;\r\n    }\r\n    const pasted = document.execCommand('insertText', false, sanitizedContent);\r\n    if (!pasted) {\r\n      if (this.inputElement.setRangeText) {\r\n        const { selectionStart: start, selectionEnd: end } = this.inputElement;\r\n        this.inputElement.setRangeText(\r\n          sanitizedContent,\r\n          start ?? 0,\r\n          end ?? 0,\r\n          'end'\r\n        );\r\n        // Angular's Reactive Form relies on \"input\" event, but on Firefox, the setRangeText method doesn't trigger it\r\n        // so we have to trigger it ourself.\r\n        if (\r\n          typeof (window as { [key: string]: any })['InstallTrigger'] !==\r\n          'undefined'\r\n        ) {\r\n          this.inputElement.dispatchEvent(\r\n            new Event('input', { cancelable: true })\r\n          );\r\n        }\r\n      } else {\r\n        // Browser does not support setRangeText, e.g. IE\r\n        this.insertAtCursor(this.inputElement, sanitizedContent);\r\n      }\r\n    }\r\n    if (this.decimal) {\r\n      this.hasDecimalPoint =\r\n        this.inputElement.value.indexOf(this.decimalSeparator) > -1;\r\n    }\r\n    this.hasNegativeSign =\r\n      this.inputElement.value.indexOf(this.negativeSign) > -1;\r\n  }\r\n\r\n  // The following 2 methods were added from the below article for browsers that do not support setRangeText\r\n  // https://stackoverflow.com/questions/11076975/how-to-insert-text-into-the-textarea-at-the-current-cursor-position\r\n  private insertAtCursor(myField: HTMLInputElement, myValue: string): void {\r\n    const startPos = myField.selectionStart ?? 0;\r\n    const endPos = myField.selectionEnd ?? 0;\r\n\r\n    myField.value =\r\n      myField.value.substring(0, startPos) +\r\n      myValue +\r\n      myField.value.substring(endPos, myField.value.length);\r\n\r\n    const pos = startPos + myValue.length;\r\n    myField.focus();\r\n    myField.setSelectionRange(pos, pos);\r\n\r\n    this.triggerEvent(myField, 'input');\r\n  }\r\n\r\n  private triggerEvent(el: HTMLInputElement, type: string): void {\r\n    if ('createEvent' in document) {\r\n      // modern browsers, IE9+\r\n      const e = document.createEvent('HTMLEvents');\r\n      e.initEvent(type, false, true);\r\n      el.dispatchEvent(e);\r\n    }\r\n  }\r\n  // end stack overflow code\r\n\r\n  private sanitizeInput(input: string): string {\r\n    let result = '';\r\n    let regex;\r\n    if (this.decimal && this.isValidDecimal(input)) {\r\n      regex = new RegExp(\r\n        `${this.getNegativeSignRegExp()}[^0-9${this.decimalSeparator}]`,\r\n        'g'\r\n      );\r\n    } else {\r\n      regex = new RegExp(`${this.getNegativeSignRegExp()}[^0-9]`, 'g');\r\n    }\r\n    result = input.replace(regex, '');\r\n\r\n    const maxLength = this.inputElement.maxLength;\r\n    if (maxLength > 0) {\r\n      // the input element has maxLength limit\r\n      const allowedLength =\r\n        maxLength -\r\n        this.inputElement.value.length +\r\n        (result.includes(`${this.negativeSign}`) ? 1 : 0);\r\n      result = allowedLength > 0 ? result.substring(0, allowedLength) : '';\r\n    }\r\n    return result;\r\n  }\r\n\r\n  private getNegativeSignRegExp(): string {\r\n    return this.allowNegatives &&\r\n      (!this.hasNegativeSign || this.getSelection().includes(this.negativeSign))\r\n      ? `(?!^${this.negativeSign})`\r\n      : '';\r\n  }\r\n\r\n  private isValidDecimal(string: string): boolean {\r\n    if (!this.hasDecimalPoint) {\r\n      return string.split(this.decimalSeparator).length <= 2;\r\n    } else {\r\n      // the input element already has a decimal separator\r\n      const selectedText = this.getSelection();\r\n      if (selectedText && selectedText.indexOf(this.decimalSeparator) > -1) {\r\n        return string.split(this.decimalSeparator).length <= 2;\r\n      } else {\r\n        return string.indexOf(this.decimalSeparator) < 0;\r\n      }\r\n    }\r\n  }\r\n\r\n  private getSelection(): string {\r\n    return this.inputElement.value.substring(\r\n      this.inputElement.selectionStart ?? 0,\r\n      this.inputElement.selectionEnd ?? 0\r\n    );\r\n  }\r\n\r\n  private forecastValue(key: string): string {\r\n    const selectionStart = this.inputElement.selectionStart ?? 0;\r\n    const selectionEnd = this.inputElement.selectionEnd ?? 0;\r\n    const oldValue = this.inputElement.value;\r\n    return (\r\n      oldValue.substring(0, selectionStart) +\r\n      key +\r\n      oldValue.substring(selectionEnd)\r\n    );\r\n  }\r\n}\r\n"]}