110 lines
4.8 KiB
Vue
110 lines
4.8 KiB
Vue
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<template>
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<DocSectionText id="accessibility" label="Accessibility" v-bind="$attrs">
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<h3>Screen Reader</h3>
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<p>
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Value to describe the component can either be provided with <i>aria-labelledby</i> or <i>aria-label</i> props. The treeselect element has a <i>combobox</i> role in addition to <i>aria-haspopup</i> and <i>aria-expanded</i> attributes. The
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relation between the combobox and the popup is created with <i>aria-controls</i> that refers to the id of the popup.
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</p>
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<p>
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The popup list has an id that refers to the <i>aria-controls</i> attribute of the <i>combobox</i> element and uses <i>tree</i> as the role. Each list item has a <i>treeitem</i> role along with <i>aria-label</i>, <i>aria-selected</i> and
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<i>aria-expanded</i> attributes. In checkbox selection, <i>aria-checked</i> is used instead of <i>aria-selected</i>. Checkbox and toggle icons are hidden from screen readers as their parent element with <i>treeitem</i> role and attributes
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are used instead for readers and keyboard support. The container element of a treenode has the <i>group</i> role. The <i>aria-setsize</i>, <i>aria-posinset</i> and <i>aria-level</i> attributes are calculated implicitly and added to each
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treeitem.
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</p>
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<DocSectionCode :code="code" hideToggleCode hideStackBlitz v-bind="$attrs" />
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<h3>Closed State Keyboard Support</h3>
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<div class="doc-tablewrapper">
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<table class="doc-table">
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<thead>
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<tr>
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<th>Key</th>
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<th>Function</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><i>tab</i></td>
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<td>Moves focus to the treeselect element.</td>
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</tr>
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<tr>
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<td><i>space</i></td>
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<td>Opens the popup and moves visual focus to the selected treenode, if there is none then first treenode receives the focus.</td>
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</tr>
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<tr>
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<td><i>down arrow</i></td>
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<td>Opens the popup and moves visual focus to the selected option, if there is none then first option receives the focus.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<h3>Popup Keyboard Support</h3>
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<div class="doc-tablewrapper">
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<table class="doc-table">
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<thead>
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<tr>
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<th>Key</th>
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<th>Function</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><i>tab</i></td>
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<td>Moves focus to the next focusable element in the page tab sequence.</td>
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</tr>
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<tr>
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<td><i>shift</i> + <i>tab</i></td>
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<td>Moves focus to the previous focusable element in the page tab sequence.</td>
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</tr>
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<tr>
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<td><i>enter</i></td>
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<td>Selects the focused option, closes the popup if selection mode is single.</td>
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</tr>
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<tr>
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<td><i>space</i></td>
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<td>Selects the focused option, closes the popup if selection mode is single.</td>
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</tr>
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<tr>
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<td><i>escape</i></td>
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<td>Closes the popup, moves focus to the treeselect element.</td>
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</tr>
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<tr>
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<td><i>down arrow</i></td>
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<td>Moves focus to the next treenode.</td>
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</tr>
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<tr>
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<td><i>up arrow</i></td>
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<td>Moves focus to the previous treenode.</td>
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</tr>
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<tr>
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<td><i>right arrow</i></td>
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<td>If node is closed, opens the node otherwise moves focus to the first child node.</td>
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</tr>
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<tr>
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<td><i>left arrow</i></td>
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<td>If node is open, closes the node otherwise moves focus to the parent node.</td>
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</tr>
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</tbody>
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</table>
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</div>
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</DocSectionText>
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</template>
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<script>
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export default {
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data() {
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return {
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code: {
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basic: `
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<span id="dd1">Options</span>
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<TreeSelect aria-labelledby="dd1" />
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<TreeSelect aria-label="Options" />
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`
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}
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};
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}
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};
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</script>
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