silverstripe-framework/javascript/SelectionGroup.js

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JavaScript
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(function($) {
$(document).ready(function() {
$('ul.SelectionGroup input.selector').live('click', function() {
var li = $(this).closest('li');
li.addClass('selected');
var prev = li.prevAll('li.selected');
if(prev.length) prev.removeClass('selected');
var next = li.nextAll('li.selected');
if(next.length) next.removeClass('selected');
$(this).focus();
});
})
})(jQuery);