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// Taken from https://stackoverflow.com/a/42149818
const isSelectorValid = (dummyElement =>
selector => {
try {
dummyElement.querySelector(selector);
} catch {
return false;
}
return true;
})(document.createDocumentFragment());
const SkipLinks = {
/**
* Inserts the list with skip links
*/
insertSkipLinks: function() {
jQuery('#skip_link_navigation').prepend(jQuery('#skiplink_list'));
jQuery('#skip_link_navigation').attr('aria-busy', 'false');
},
/**
* sets the area (of the id) as the current area for tab-navigation
* and highlights it
*/
setActiveTarget (id) {
let fragment = null;
// set active area only if skip links are activated
if (!document.getElementById('skip_link_navigation')) {
return false;
}
if (id) {
fragment = id;
} else {
fragment = document.location.hash;
}
if (fragment.length > 0 && isSelectorValid(fragment) && document.querySelector(fragment)) {
if (jQuery(fragment).is(':focusable')) {
jQuery(fragment)
.click()
.focus();
} else {
//Set the focus on the first focusable element:
jQuery(fragment).find(':focusable').eq(0).focus();
}
return true;
}
return false;
},
initialize: function() {
SkipLinks.insertSkipLinks();
}
};
export default SkipLinks;
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