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ADA compliant Expandable Content Component for Knockout
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.expandable-content-collapsed .expandable-content-wrapper { | |
display: none; | |
} |
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(function (global) { | |
if(!global.ko) { | |
return; | |
} | |
var template = | |
'<div class="expandable-content-component" aria-live="polite" data-bind="css: { \'expandable-content-expanded\': isExpanded(), \'expandable-content-collapsed\': !isExpanded() }, attr: {id: id}" >' + | |
'<!--ko if: labelType === "button" -->' + | |
' <button type="button" data-bind="attr: {class: \'expandable-content-label \' + labelClassName, \'aria-expanded\': isExpanded().toString(), \'aria-controls\': wrapperId}, text: labelText, click: toggleExpand"></button>' + | |
'<!-- /ko -->' + | |
'<!--ko ifnot: labelType === "button" -->' + | |
'<a href="#" data-bind="attr: {class: labelClassName, \'aria-expanded\': isExpanded().toString(), \'aria-controls\': wrapperId}, text: labelText, click: toggleExpand"></a>' + | |
'<!-- /ko -->' + | |
' <div class="expandable-content-wrapper" role="region" data-bind="attr: {id: wrapperId, \'aria-hidden\': (!isExpanded()).toString()}">' + | |
' <!-- ko template: { nodes: $componentTemplateNodes, data: $parent } --><!-- /ko -->' + | |
' </div>' + | |
'</div>'; | |
function generateUniqueId(prefix) { | |
var id = prefix + '_' + (new Date()).getTime(); | |
if (document.getElementById(id)) { | |
return generateUniqueId(prefix); | |
} | |
return id; | |
} | |
function ComponentViewModel(params) { | |
var self = this; | |
var expanded = params.isExpanded || false; | |
if (!ko.isObservable(expanded)) { | |
expanded = ko.observable(expanded); | |
} | |
if (!(params.text || params.labelText)) { | |
throw (new Error('Expandable Content Component requires a text parameter.')); | |
} | |
self.id = params.id || generateUniqueId('expandable_content_component'); | |
self.wrapperId = params.wrapperId || generateUniqueId('expandable_content_wrapper'); | |
self.labelType = params.labelType || 'button'; | |
self.labelText = params.text || params.labelText; | |
self.labelClassName = params.labelClassName; | |
self.isExpanded = expanded; | |
self.toggleExpand = function () { | |
self.isExpanded(!self.isExpanded()); | |
} | |
} | |
ko.components.register('expandable-content', { | |
viewModel: ComponentViewModel, | |
template: template | |
}); | |
})(window); |
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<h1>Expandable Content Component</h1> | |
<expandable-content params="labelText: 'Expand Content', labelClassName: 'button', labelType: 'anchor'"> | |
<h2>Ordered List</h2> | |
<ol> | |
<li>List Item 1</li> | |
<li>List Item 2</li> | |
<li>List Item 3</li> | |
<li data-bind="text: something"></li> | |
</ol> | |
<h2>Unordered List</h2> | |
<ul data-bind="foreach: {data: listItems, as: 'item'}"> | |
<li data-bind="text: item"></li> | |
</ul> | |
</expandable-content> |
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