|
| 1 | +<template> |
| 2 | + <div class="vue-focus-loop"> |
| 3 | + <div |
| 4 | + :tabindex="getTabindex" |
| 5 | + @focus="handleFocusStart" |
| 6 | + /> |
| 7 | + <div ref="focusLoopRef"> |
| 8 | + <slot /> |
| 9 | + </div> |
| 10 | + <div |
| 11 | + :tabindex="getTabindex" |
| 12 | + @focus="handleFocusEnd" |
| 13 | + /> |
| 14 | + </div> |
| 15 | +</template> |
| 16 | + |
| 17 | +<script> |
| 18 | +import { ref, computed, watch, onMounted } from 'vue' |
| 19 | +
|
| 20 | +const focusableElementsSelector = [ |
| 21 | + ...['input', 'select', 'button', 'textarea'].map(field => `${field}:not([disabled])`), |
| 22 | + 'a[href]', |
| 23 | + 'video[controls]', |
| 24 | + 'audio[controls]', |
| 25 | + '[tabindex]:not([tabindex^="-"])', |
| 26 | + '[contenteditable]:not([contenteditable="false"])' |
| 27 | +].join(',') |
| 28 | +
|
| 29 | +export default { |
| 30 | + name: 'FocusLoop', |
| 31 | +
|
| 32 | + props: { |
| 33 | + disabled: { |
| 34 | + type: Boolean, |
| 35 | + default: false |
| 36 | + }, |
| 37 | + isVisible: { |
| 38 | + type: Boolean, |
| 39 | + default: false |
| 40 | + } |
| 41 | + }, |
| 42 | +
|
| 43 | + disableAxeAudit: true, |
| 44 | +
|
| 45 | + setup (props) { |
| 46 | + const focusLoopRef = ref(null) |
| 47 | + const alreadyFocused = ref(false) |
| 48 | + const getTabindex = computed(() => props.disabled ? -1 : 0) |
| 49 | +
|
| 50 | + watch(() => props.isVisible, focusFirst) |
| 51 | +
|
| 52 | + onMounted(() => focusFirst(props.isVisible || true)) |
| 53 | +
|
| 54 | + function focusFirst (visible) { |
| 55 | + if (visible) { |
| 56 | + const elements = getFocusableElements() |
| 57 | + if (elements.length) setTimeout(() => elements[0].focus(), 200) |
| 58 | + } |
| 59 | + } |
| 60 | +
|
| 61 | + function getFocusableElements () { |
| 62 | + const focusableElements = focusLoopRef.value.querySelectorAll(focusableElementsSelector) |
| 63 | + if (focusableElements && focusableElements.length) return focusableElements |
| 64 | + return [] |
| 65 | + } |
| 66 | +
|
| 67 | + function handleFocusStart () { |
| 68 | + const elements = getFocusableElements() |
| 69 | + if (elements.length) { |
| 70 | + const index = alreadyFocused.value ? elements.length - 1 : 0 |
| 71 | + alreadyFocused.value = true |
| 72 | + elements[index].focus() |
| 73 | + } |
| 74 | + } |
| 75 | +
|
| 76 | + function handleFocusEnd () { |
| 77 | + const elements = getFocusableElements() |
| 78 | + elements.length && elements[0].focus() |
| 79 | + } |
| 80 | +
|
| 81 | + return { |
| 82 | + focusLoopRef, |
| 83 | + getTabindex, |
| 84 | + handleFocusEnd, |
| 85 | + handleFocusStart |
| 86 | + } |
| 87 | + } |
| 88 | +} |
| 89 | +</script> |
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