botframework-webchat-component
Version:
React component of botframework-webchat
32 lines (26 loc) • 3.75 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = getTabIndex;
var _window = window,
userAgent = _window.navigator.userAgent;
var IE_FOCUSABLE_LIST = ['a', 'body', 'button', 'frame', 'iframe', 'img', 'input', 'isindex', 'object', 'select', 'textarea'];
var IS_FIREFOX = /Firefox\//i.test(userAgent);
var IS_IE = /Trident\//i.test(userAgent);
function getTabIndex(element) {
var tabIndex = element.tabIndex;
if (IS_IE) {
var tabIndexAttribute = element.attributes.getNamedItem('tabindex');
if (!tabIndexAttribute || !tabIndexAttribute.specified) {
return ~IE_FOCUSABLE_LIST.indexOf(element.nodeName.toLowerCase()) ? 0 : null;
}
} else if (!~tabIndex) {
var attr = element.getAttribute('tabindex');
if (attr === null || attr === '' && !IS_FIREFOX) {
return null;
}
}
return tabIndex;
}
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