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Last updated: May 6, 2024, 11:31 p.m.
HTML Head
HTML Body
<h1>Accessible Custom Checkbox Widget using ARIA</h1> <fieldset> <legend> Pizza Toppings </legend> <label> <input type="checkbox" onfocus="checkboxFocus(event)" onblur="checkboxBlur(event)"/> Green pepper </label> <label> <input type="checkbox" onfocus="checkboxFocus(event)" onblur="checkboxBlur(event)"/> Onion </label> <div role="checkbox" tabindex="0" aria-checked="false" onkeydown="keydownCheckbox(event)" onclick="clickCheckbox(event)"> <span aria-hidden="true"></span> Mushrooms </div> <div role="checkbox" tabindex="0" aria-checked="false" onkeydown="keydownCheckbox(event)" onclick="clickCheckbox(event)"> <span aria-hidden="true"></span> Spinach </div> </fieldset>
CSS
fieldset { border-color: #EEE; width: 10em; } fieldset legend { font-size: 100%; } label, [role="checkbox"] { padding: 4px; margin-bottom: 0.25em; display: block; border: none; width: 10em; } label input { margin-right: 0.25em; } div[role="checkbox"] span:before { content: '✗'; color: red; padding-left: 0.125em; padding-right: 0.25em; } div[role="checkbox"][aria-checked="true"] span:before { content: '✓'; color: green; padding-left: 0.125em; padding-right: 0.315em; } label.focus, [role="checkbox"]:focus { padding: 2px; border: 2px solid #999; background-color: #DDE; } label:hover, [role="checkbox"]:hover { background-color: #CCD; }
JavaScript
function toggleCheckbox(node) { if (node.getAttribute('aria-checked') === 'true') { node.setAttribute('aria-checked', 'false'); } else { node.setAttribute('aria-checked', 'true'); } } function keydownCheckbox(event) { var cb = event.currentTarget; if (event.key === ' ') { toggleCheckbox(cb); event.stopPropagation(); event.preventDefault(); } } function clickCheckbox(event) { var cb = event.currentTarget; toggleCheckbox(cb); event.stopPropagation(); event.preventDefault(); } function checkboxFocus(event) { event.currentTarget.parentNode.classList.add('focus'); } function checkboxBlur(event) { event.currentTarget.parentNode.classList.remove('focus'); }