wehub-resource-sync
99 lines
2.5 KiB
TypeScript
99 lines
2.5 KiB
TypeScript
import type { KeyboardEvent } from "react";
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type NumericInputOptions = {
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allowDecimal?: boolean;
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allowNegative?: boolean;
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min?: number;
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};
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const NAVIGATION_KEYS = new Set([
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"Backspace",
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"Delete",
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"End",
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"Enter",
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"Escape",
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"Home",
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"Tab",
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"ArrowDown",
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"ArrowLeft",
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"ArrowRight",
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"ArrowUp",
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]);
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function canUseNegative(options: NumericInputOptions) {
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if (options.allowNegative != null) return options.allowNegative;
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return typeof options.min === "number" ? options.min < 0 : true;
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}
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export function sanitizeNumericInput(
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value: string,
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options: NumericInputOptions = {},
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) {
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const allowDecimal = options.allowDecimal ?? true;
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const allowNegative = canUseNegative(options);
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let nextValue = "";
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let hasDecimal = false;
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for (const character of value.trim()) {
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if (character >= "0" && character <= "9") {
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nextValue += character;
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continue;
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}
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if (allowDecimal && character === "." && !hasDecimal) {
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nextValue += character;
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hasDecimal = true;
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continue;
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}
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if (
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allowNegative &&
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(character === "-" || character === "−") &&
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nextValue.length === 0
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) {
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nextValue = "-";
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}
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}
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return nextValue;
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}
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export function numericInputMode(options: NumericInputOptions = {}) {
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return options.allowDecimal ?? true ? "decimal" : "numeric";
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}
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export function preventInvalidNumberInput(
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event: KeyboardEvent<HTMLInputElement>,
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options: NumericInputOptions = {},
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) {
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if (event.defaultPrevented || event.metaKey || event.ctrlKey) return false;
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if (NAVIGATION_KEYS.has(event.key)) return false;
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if (/^\d$/.test(event.key)) return false;
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const allowDecimal = options.allowDecimal ?? true;
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const allowNegative = canUseNegative(options);
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const input = event.currentTarget;
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const value = input.value;
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const selectionStart = input.selectionStart ?? value.length;
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const selectionEnd = input.selectionEnd ?? selectionStart;
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const selectedText = value.slice(selectionStart, selectionEnd);
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if (allowDecimal && event.key === ".") {
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const replacesExistingDecimal = selectedText.includes(".");
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if (!value.includes(".") || replacesExistingDecimal) return false;
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}
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if (allowNegative && (event.key === "-" || event.key === "−")) {
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const replacesExistingNegative = selectedText.includes("-");
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if (
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selectionStart === 0 &&
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(!value.includes("-") || replacesExistingNegative)
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) {
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return false;
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}
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}
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event.preventDefault();
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return true;
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}
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