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Allow keys like tab, arrows, or Ctrl in number input fields #93

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Merged
dontub merged 1 commit into from
Jul 16, 2025
Merged

Allow keys like tab, arrows, or Ctrl in number input fields #93

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71 changes: 60 additions & 11 deletions js/number-input.js
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,34 @@
.formatToParts(1.1)
.find(part => part.type === 'decimal')
.value;
const digits = '0123456789';

const digits = [
'0',
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
];

const allowedKeys = [
'ArrowDown',
'ArrowLeft',
'ArrowRight',
'ArrowUp',
'Backspace',
'Delete',
'End',
'Enter',
'Home',
'PageDown',
'PageUp',
'Tab',
];

function getElementLang(element) {
if (element.lang) {
Expand All @@ -50,23 +77,45 @@
.value;
}

element.addEventListener('keydown', function (event) {
if (event.key === 'Backspace' || '0123456789'.indexOf(event.key) !== -1) {
return;
function isCharAllowed(char) {
if (digits.includes(char)) {
return true;
}

if ('-' === event.key) {
if (element.value.indexOf('-') === -1 && (element.min < 0 || element.min === '' || element.min == null)) {
return;
if ('-' === char) {
if (!element.value.includes('-') && (element.min < 0 || element.min === '' || element.min == null)) {
return true;
}
}
else if (decimalSeparators.indexOf(event.key) !== -1) {
if (element.value.indexOf('.') === -1 && (element.step === 'any' || element.step < 1)) {
return;
else if (decimalSeparators.includes(char)) {
if (!element.value.includes('.') && (element.step === 'any' || element.step < 1)) {
return true;
}
}

event.preventDefault();
return false;
}

element.addEventListener('keydown', function (event) {
if (!event.ctrlKey && !allowedKeys.includes(event.key) && !isCharAllowed(event.key)) {
event.preventDefault();
}
});

element.addEventListener('paste', function (event) {
const data = event.clipboardData.getData('text/plain');
if (data === '') {
event.preventDefault();
return;
}

for (let i = 0; i < data.length; i++) {
if (!isCharAllowed(data[i])) {
event.preventDefault();

return;
}
}
});
});
}
Expand Down