aria-utils.js
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var aria = aria || {};
aria.Utils = aria.Utils || {};
/**
* @desc Set focus on descendant nodes until the first focusable element is
* found.
* @param element
* DOM node for which to find the first focusable descendant.
* @returns
* true if a focusable element is found and focus is set.
*/
aria.Utils.focusFirstDescendant = function(element) {
for (var i = 0; i < element.childNodes.length; i++) {
var child = element.childNodes[i];
if (aria.Utils.attemptFocus(child) || aria.Utils.focusFirstDescendant(child)) {
return true;
}
}
return false;
};
/**
* @desc Find the last descendant node that is focusable.
* @param element
* DOM node for which to find the last focusable descendant.
* @returns
* true if a focusable element is found and focus is set.
*/
aria.Utils.focusLastDescendant = function(element) {
for (var i = element.childNodes.length - 1; i >= 0; i--) {
var child = element.childNodes[i];
if (aria.Utils.attemptFocus(child) || aria.Utils.focusLastDescendant(child)) {
return true;
}
}
return false;
};
/**
* @desc Set Attempt to set focus on the current node.
* @param element
* The node to attempt to focus on.
* @returns
* true if element is focused.
*/
aria.Utils.attemptFocus = function(element) {
if (!aria.Utils.isFocusable(element)) {
return false;
}
aria.Utils.IgnoreUtilFocusChanges = true;
try {
element.focus();
} catch (e) {
}
aria.Utils.IgnoreUtilFocusChanges = false;
return (document.activeElement === element);
};
aria.Utils.isFocusable = function(element) {
if (element.tabIndex > 0 || (element.tabIndex === 0 && element.getAttribute('tabIndex') !== null)) {
return true;
}
if (element.disabled) {
return false;
}
switch (element.nodeName) {
case 'A':
return !!element.href && element.rel !== 'ignore';
case 'INPUT':
return element.type !== 'hidden' && element.type !== 'file';
case 'BUTTON':
case 'SELECT':
case 'TEXTAREA':
return true;
default:
return false;
}
};
/**
* 触发一个事件
* mouseenter, mouseleave, mouseover, keyup, change, click 等
* @param {Element} elm
* @param {String} name
* @param {*} opts
*/
aria.Utils.triggerEvent = function(elm, name, ...opts) {
let eventName;
if (/^mouse|click/.test(name)) {
eventName = 'MouseEvents';
} else if (/^key/.test(name)) {
eventName = 'KeyboardEvent';
} else {
eventName = 'HTMLEvents';
}
const evt = document.createEvent(eventName);
evt.initEvent(name, ...opts);
elm.dispatchEvent
? elm.dispatchEvent(evt)
: elm.fireEvent('on' + name, evt);
return elm;
};
aria.Utils.keys = {
tab: 9,
enter: 13,
space: 32,
left: 37,
up: 38,
right: 39,
down: 40
};
export default aria.Utils;