index.js
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var getDefaultParent = function (originalTarget) {
if (typeof document === 'undefined') {
return null;
}
var sampleTarget = Array.isArray(originalTarget) ? originalTarget[0] : originalTarget;
return sampleTarget.ownerDocument.body;
};
var counterMap = new WeakMap();
var uncontrolledNodes = new WeakMap();
var markerMap = {};
var lockCount = 0;
var unwrapHost = function (node) {
return node && (node.host || unwrapHost(node.parentNode));
};
var correctTargets = function (parent, targets) {
return targets
.map(function (target) {
if (parent.contains(target)) {
return target;
}
var correctedTarget = unwrapHost(target);
if (correctedTarget && parent.contains(correctedTarget)) {
return correctedTarget;
}
console.error('aria-hidden', target, 'in not contained inside', parent, '. Doing nothing');
return null;
})
.filter(function (x) { return Boolean(x); });
};
/**
* Marks everything except given node(or nodes) as aria-hidden
* @param {Element | Element[]} originalTarget - elements to keep on the page
* @param [parentNode] - top element, defaults to document.body
* @param {String} [markerName] - a special attribute to mark every node
* @param {String} [controlAttribute] - html Attribute to control
* @return {Undo} undo command
*/
var applyAttributeToOthers = function (originalTarget, parentNode, markerName, controlAttribute) {
var targets = correctTargets(parentNode, Array.isArray(originalTarget) ? originalTarget : [originalTarget]);
if (!markerMap[markerName]) {
markerMap[markerName] = new WeakMap();
}
var markerCounter = markerMap[markerName];
var hiddenNodes = [];
var elementsToKeep = new Set();
var elementsToStop = new Set(targets);
var keep = function (el) {
if (!el || elementsToKeep.has(el)) {
return;
}
elementsToKeep.add(el);
keep(el.parentNode);
};
targets.forEach(keep);
var deep = function (parent) {
if (!parent || elementsToStop.has(parent)) {
return;
}
Array.prototype.forEach.call(parent.children, function (node) {
if (elementsToKeep.has(node)) {
deep(node);
}
else {
try {
var attr = node.getAttribute(controlAttribute);
var alreadyHidden = attr !== null && attr !== 'false';
var counterValue = (counterMap.get(node) || 0) + 1;
var markerValue = (markerCounter.get(node) || 0) + 1;
counterMap.set(node, counterValue);
markerCounter.set(node, markerValue);
hiddenNodes.push(node);
if (counterValue === 1 && alreadyHidden) {
uncontrolledNodes.set(node, true);
}
if (markerValue === 1) {
node.setAttribute(markerName, 'true');
}
if (!alreadyHidden) {
node.setAttribute(controlAttribute, 'true');
}
}
catch (e) {
console.error('aria-hidden: cannot operate on ', node, e);
}
}
});
};
deep(parentNode);
elementsToKeep.clear();
lockCount++;
return function () {
hiddenNodes.forEach(function (node) {
var counterValue = counterMap.get(node) - 1;
var markerValue = markerCounter.get(node) - 1;
counterMap.set(node, counterValue);
markerCounter.set(node, markerValue);
if (!counterValue) {
if (!uncontrolledNodes.has(node)) {
node.removeAttribute(controlAttribute);
}
uncontrolledNodes.delete(node);
}
if (!markerValue) {
node.removeAttribute(markerName);
}
});
lockCount--;
if (!lockCount) {
// clear
counterMap = new WeakMap();
counterMap = new WeakMap();
uncontrolledNodes = new WeakMap();
markerMap = {};
}
};
};
/**
* Marks everything except given node(or nodes) as aria-hidden
* @param {Element | Element[]} originalTarget - elements to keep on the page
* @param [parentNode] - top element, defaults to document.body
* @param {String} [markerName] - a special attribute to mark every node
* @return {Undo} undo command
*/
export var hideOthers = function (originalTarget, parentNode, markerName) {
if (markerName === void 0) { markerName = 'data-aria-hidden'; }
var targets = Array.from(Array.isArray(originalTarget) ? originalTarget : [originalTarget]);
var activeParentNode = parentNode || getDefaultParent(originalTarget);
if (!activeParentNode) {
return function () { return null; };
}
// we should not hide aria-live elements - https://github.com/theKashey/aria-hidden/issues/10
// and script elements, as they have no impact on accessibility.
targets.push.apply(targets, Array.from(activeParentNode.querySelectorAll('[aria-live], script')));
return applyAttributeToOthers(targets, activeParentNode, markerName, 'aria-hidden');
};
/**
* Marks everything except given node(or nodes) as inert
* @param {Element | Element[]} originalTarget - elements to keep on the page
* @param [parentNode] - top element, defaults to document.body
* @param {String} [markerName] - a special attribute to mark every node
* @return {Undo} undo command
*/
export var inertOthers = function (originalTarget, parentNode, markerName) {
if (markerName === void 0) { markerName = 'data-inert-ed'; }
var activeParentNode = parentNode || getDefaultParent(originalTarget);
if (!activeParentNode) {
return function () { return null; };
}
return applyAttributeToOthers(originalTarget, activeParentNode, markerName, 'inert');
};
/**
* @returns if current browser supports inert
*/
export var supportsInert = function () {
return typeof HTMLElement !== 'undefined' && HTMLElement.prototype.hasOwnProperty('inert');
};
/**
* Automatic function to "suppress" DOM elements - _hide_ or _inert_ in the best possible way
* @param {Element | Element[]} originalTarget - elements to keep on the page
* @param [parentNode] - top element, defaults to document.body
* @param {String} [markerName] - a special attribute to mark every node
* @return {Undo} undo command
*/
export var suppressOthers = function (originalTarget, parentNode, markerName) {
if (markerName === void 0) { markerName = 'data-suppressed'; }
return (supportsInert() ? inertOthers : hideOthers)(originalTarget, parentNode, markerName);
};