<template> <DocSectionText id="accessibility" label="Accessibility" v-bind="$attrs"> <h3>Screen Reader</h3> <p> Value to describe the component can either be provided with <i>aria-labelledby</i> or <i>aria-label</i> props. The treeselect element has a <i>combobox</i> role in addition to <i>aria-haspopup</i> and <i>aria-expanded</i> attributes. The relation between the combobox and the popup is created with <i>aria-controls</i> that refers to the id of the popup. </p> <p> The popup list has an id that refers to the <i>aria-controls</i> attribute of the <i>combobox</i> element and uses <i>tree</i> as the role. Each list item has a <i>treeitem</i> role along with <i>aria-label</i>, <i>aria-selected</i> and <i>aria-expanded</i> attributes. In checkbox selection, <i>aria-checked</i> is used instead of <i>aria-selected</i>. Checkbox and toggle icons are hidden from screen readers as their parent element with <i>treeitem</i> role and attributes are used instead for readers and keyboard support. The container element of a treenode has the <i>group</i> role. The <i>aria-setsize</i>, <i>aria-posinset</i> and <i>aria-level</i> attributes are calculated implicitly and added to each treeitem. </p> <DocSectionCode :code="code" hideToggleCode hideCodeSandbox hideStackBlitz v-bind="$attrs" /> <h3>Closed State Keyboard Support</h3> <div class="doc-tablewrapper"> <table class="doc-table"> <thead> <tr> <th>Key</th> <th>Function</th> </tr> </thead> <tbody> <tr> <td><i>tab</i></td> <td>Moves focus to the treeselect element.</td> </tr> <tr> <td><i>space</i></td> <td>Opens the popup and moves visual focus to the selected treenode, if there is none then first treenode receives the focus.</td> </tr> <tr> <td><i>down arrow</i></td> <td>Opens the popup and moves visual focus to the selected option, if there is none then first option receives the focus.</td> </tr> </tbody> </table> </div> <h6>Popup Keyboard Support</h6> <div class="doc-tablewrapper"> <table class="doc-table"> <thead> <tr> <th>Key</th> <th>Function</th> </tr> </thead> <tbody> <tr> <td><i>tab</i></td> <td>Moves focus to the next focusable element in the page tab sequence.</td> </tr> <tr> <td><i>shift</i> + <i>tab</i></td> <td>Moves focus to the previous focusable element in the page tab sequence.</td> </tr> <tr> <td><i>enter</i></td> <td>Selects the focused option, closes the popup if selection mode is single.</td> </tr> <tr> <td><i>space</i></td> <td>Selects the focused option, closes the popup if selection mode is single.</td> </tr> <tr> <td><i>escape</i></td> <td>Closes the popup, moves focus to the treeselect element.</td> </tr> <tr> <td><i>down arrow</i></td> <td>Moves focus to the next treenode.</td> </tr> <tr> <td><i>up arrow</i></td> <td>Moves focus to the previous treenode.</td> </tr> <tr> <td><i>right arrow</i></td> <td>If node is closed, opens the node otherwise moves focus to the first child node.</td> </tr> <tr> <td><i>left arrow</i></td> <td>If node is open, closes the node otherwise moves focus to the parent node.</td> </tr> </tbody> </table> </div> </DocSectionText> </template> <script> export default { data() { return { code: { basic: ` <span id="dd1">Options</span> <TreeSelect aria-labelledby="dd1" /> <TreeSelect aria-label="Options" />` } }; } }; </script>