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| 1 | +// app/assets/javascript/stepper-input.js |
| 2 | + |
| 3 | +// Initialize stepper input (number input with increase/decrease buttons) |
| 4 | +document.addEventListener('DOMContentLoaded', () => { |
| 5 | + // Prevent text selection when rapidly clicking buttons |
| 6 | + // This stops the browser from selecting page text when users click the +/- buttons quickly |
| 7 | + // We still allow selection on the input itself so users can select/copy the value |
| 8 | + const wrappers = document.querySelectorAll('.app-stepper-input__wrapper') |
| 9 | + wrappers.forEach((wrapper) => { |
| 10 | + wrapper.addEventListener('selectstart', (e) => { |
| 11 | + // Only prevent selection if it's not the input field being selected |
| 12 | + if (e.target.tagName !== 'INPUT') { |
| 13 | + e.preventDefault() |
| 14 | + } |
| 15 | + }) |
| 16 | + }) |
| 17 | + |
| 18 | + // Update button disabled states based on current value |
| 19 | + const updateButtonStates = (input) => { |
| 20 | + const minAttr = input.getAttribute('min') |
| 21 | + const maxAttr = input.getAttribute('max') |
| 22 | + const min = minAttr !== null ? parseInt(minAttr, 10) : null |
| 23 | + const max = maxAttr !== null ? parseInt(maxAttr, 10) : null |
| 24 | + const value = parseInt(input.value, 10) || 0 |
| 25 | + |
| 26 | + const inputId = input.getAttribute('id') |
| 27 | + const decreaseButton = document.querySelector( |
| 28 | + `.app-stepper-input__button--decrease[data-input-id="${inputId}"]` |
| 29 | + ) |
| 30 | + const increaseButton = document.querySelector( |
| 31 | + `.app-stepper-input__button--increase[data-input-id="${inputId}"]` |
| 32 | + ) |
| 33 | + |
| 34 | + if (decreaseButton) { |
| 35 | + decreaseButton.disabled = min !== null && value <= min |
| 36 | + } |
| 37 | + |
| 38 | + if (increaseButton) { |
| 39 | + increaseButton.disabled = max !== null && value >= max |
| 40 | + } |
| 41 | + } |
| 42 | + |
| 43 | + // Announce value changes to screen readers |
| 44 | + const announceValue = (inputId, value, atLimit = false) => { |
| 45 | + const statusElement = document.getElementById(`${inputId}-status`) |
| 46 | + if (statusElement) { |
| 47 | + let announcement |
| 48 | + |
| 49 | + // Handle negative numbers explicitly for screen readers |
| 50 | + if (typeof value === 'number' && value < 0) { |
| 51 | + announcement = `negative ${Math.abs(value)}` |
| 52 | + } else { |
| 53 | + announcement = String(value) |
| 54 | + } |
| 55 | + |
| 56 | + // Add limit reached message if at boundary |
| 57 | + if (atLimit) { |
| 58 | + announcement += ', limit reached' |
| 59 | + } |
| 60 | + |
| 61 | + statusElement.textContent = announcement |
| 62 | + } |
| 63 | + } |
| 64 | + |
| 65 | + const buttons = document.querySelectorAll('.app-stepper-input__button') |
| 66 | + |
| 67 | + buttons.forEach((button) => { |
| 68 | + // Prevent text selection on rapid clicks |
| 69 | + button.addEventListener('selectstart', (e) => { |
| 70 | + e.preventDefault() |
| 71 | + }) |
| 72 | + |
| 73 | + button.addEventListener('click', () => { |
| 74 | + const inputId = button.getAttribute('data-input-id') |
| 75 | + const input = document.getElementById(inputId) |
| 76 | + |
| 77 | + if (!input) { |
| 78 | + return |
| 79 | + } |
| 80 | + |
| 81 | + const currentValue = parseInt(input.value, 10) || 0 |
| 82 | + const minAttr = input.getAttribute('min') |
| 83 | + const maxAttr = input.getAttribute('max') |
| 84 | + const min = minAttr !== null ? parseInt(minAttr, 10) : null |
| 85 | + const max = maxAttr !== null ? parseInt(maxAttr, 10) : null |
| 86 | + const step = parseInt(input.getAttribute('step'), 10) || 1 |
| 87 | + |
| 88 | + let newValue = currentValue |
| 89 | + |
| 90 | + if (button.classList.contains('app-stepper-input__button--increase')) { |
| 91 | + newValue = currentValue + step |
| 92 | + if (max !== null) { |
| 93 | + newValue = Math.min(newValue, max) |
| 94 | + } |
| 95 | + } else if ( |
| 96 | + button.classList.contains('app-stepper-input__button--decrease') |
| 97 | + ) { |
| 98 | + newValue = currentValue - step |
| 99 | + if (min !== null) { |
| 100 | + newValue = Math.max(newValue, min) |
| 101 | + } |
| 102 | + } |
| 103 | + |
| 104 | + input.value = newValue |
| 105 | + |
| 106 | + // Update button states |
| 107 | + updateButtonStates(input) |
| 108 | + |
| 109 | + // Announce new value, and add "limit reached" if we've hit a boundary |
| 110 | + const reachedMax = max !== null && newValue === max |
| 111 | + const reachedMin = min !== null && newValue === min |
| 112 | + |
| 113 | + announceValue(inputId, newValue, reachedMax || reachedMin) |
| 114 | + |
| 115 | + // Trigger input and change events so other listeners can respond |
| 116 | + input.dispatchEvent(new Event('input', { bubbles: true })) |
| 117 | + input.dispatchEvent(new Event('change', { bubbles: true })) |
| 118 | + }) |
| 119 | + }) |
| 120 | + |
| 121 | + // Handle manual input to enforce min/max |
| 122 | + const inputs = document.querySelectorAll( |
| 123 | + '.app-stepper-input input[type="text"][inputmode="numeric"]' |
| 124 | + ) |
| 125 | + |
| 126 | + inputs.forEach((input) => { |
| 127 | + input.addEventListener('blur', () => { |
| 128 | + const minAttr = input.getAttribute('min') |
| 129 | + const maxAttr = input.getAttribute('max') |
| 130 | + const min = minAttr !== null ? parseInt(minAttr, 10) : null |
| 131 | + const max = maxAttr !== null ? parseInt(maxAttr, 10) : null |
| 132 | + let value = parseInt(input.value, 10) |
| 133 | + |
| 134 | + if (isNaN(value)) { |
| 135 | + value = min !== null ? min : 0 |
| 136 | + } else { |
| 137 | + if (min !== null && value < min) { |
| 138 | + value = min |
| 139 | + } |
| 140 | + if (max !== null && value > max) { |
| 141 | + value = max |
| 142 | + } |
| 143 | + } |
| 144 | + |
| 145 | + input.value = value |
| 146 | + |
| 147 | + // Update button states after manual input |
| 148 | + updateButtonStates(input) |
| 149 | + }) |
| 150 | + |
| 151 | + // Also update on input event for immediate feedback |
| 152 | + input.addEventListener('input', () => { |
| 153 | + updateButtonStates(input) |
| 154 | + }) |
| 155 | + }) |
| 156 | +}) |
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