48 lines
1.0 KiB
JavaScript
48 lines
1.0 KiB
JavaScript
/**
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* source by `dom-matches`
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* https://github.com/necolas/dom-matches.git
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*/
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/**
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* Determine if a DOM element matches a CSS selector
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*
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* @param {Element} elem
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* @param {String} selector
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* @return {Boolean}
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* @api public
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*/
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export default function matches(elem, selector) {
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// Vendor-specific implementations of `Element.prototype.matches()`.
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const proto = window.Element.prototype;
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const nativeMatches =
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proto.matches ||
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proto.mozMatchesSelector ||
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proto.msMatchesSelector ||
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proto.oMatchesSelector ||
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proto.webkitMatchesSelector;
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if (!elem || elem.nodeType !== 1) {
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return false;
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}
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const parentElem = elem.parentNode;
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// use native 'matches'
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if (nativeMatches) {
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return nativeMatches.call(elem, selector);
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}
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// native support for `matches` is missing and a fallback is required
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const nodes = parentElem.querySelectorAll(selector);
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const len = nodes.length;
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for (let i = 0; i < len; i++) {
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if (nodes[i] === elem) {
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return true;
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}
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}
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return false;
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}
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