Created
February 24, 2015 15:34
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ARIA tabs fork used on WPD (snapshot)
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var $ = jQuery; | |
var $list = $('.topbar__tabs'); | |
var $sections = $('.tabbed-section'); | |
var selected_index = 0; | |
var $items = $list.children('li'); | |
var $anchors = $list.find('a'); | |
// The setup | |
$list.attr('role', 'tablist'); | |
$items.attr('role', 'presentation'); | |
$anchors.attr({ | |
'role' : 'tab', | |
'tabindex' : '-1' | |
}); | |
// Make each aria-controls correspond id of targeted section (re href) | |
$anchors.attr('aria-controls', function() { | |
return $(this).attr('href').substring(1); | |
}); | |
// Make one tab selected by default and allow it focus | |
$items.eq(selected_index).children('a').attr({ | |
'aria-selected' : 'true', | |
'tabindex' : '0' | |
}); | |
// Make each section focusable and give it the tabpanel role | |
$sections.attr({ | |
'role' : 'tabpanel' | |
}); | |
// Make first child of each panel focusable programmatically | |
$sections.children(':first-child').attr({ | |
'tabindex' : '0' | |
}); | |
// Make all but the first section hidden (ARIA state and display CSS) | |
$sections.not( $sections.eq(selected_index) ).attr({ | |
'aria-hidden' : 'true' | |
}); | |
// Change focus between tabs with arrow keys | |
$anchors.on('keydown', function(e) { | |
// define current, previous and next (possible) tabs | |
var $original = $(this); | |
var $prev = $(this).parents('li').prev().children('[role="tab"]'); | |
var $next = $(this).parents('li').next().children('[role="tab"]'); | |
var $target; | |
// find the direction (prev or next) | |
switch (e.keyCode) { | |
case 37: | |
$target = $prev; | |
break; | |
case 39: | |
$target = $next; | |
break; | |
default: | |
$target = false; | |
break; | |
} | |
if ($target.length) { | |
$original.attr({ | |
'tabindex' : '-1', | |
'aria-selected' : null | |
}); | |
$target.attr({ | |
'tabindex' : '0', | |
'aria-selected' : true | |
}).focus(); | |
} | |
showPanel(document.activeElement); | |
}); | |
// Handle click on tab to show + focus tabpanel | |
$anchors.on('click', function(e) { | |
e.preventDefault(); | |
// remove focusability [sic] and aria-selected | |
$anchors.attr({ | |
'tabindex': '-1', | |
'aria-selected' : null | |
}); | |
// replace above on clicked tab | |
$(this).attr({ | |
'aria-selected' : true, | |
'tabindex' : '0' | |
}); | |
showPanel(this); | |
}); | |
function showPanel(anchor) { | |
// save current URL state in data attribute | |
$sections.filter(':not([aria-hidden="true"])').data({ 'url-state': location.pathname }); | |
// Hide panels | |
$sections.attr('aria-hidden', 'true'); | |
var $panel = $('#' + $(anchor).attr('href').substring(1)); | |
// Show corresponding panel | |
$panel.attr('aria-hidden', null); | |
// load new URL state from data attribute | |
history.replaceState({}, '', $panel.data('url-state') || '/'); | |
} |
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