superbiche of Les enculeys
2/22/2017 - 3:51 PM

From http://davidwalsh.name/essential-javascript-functions Oftentimes we validate input before moving forward; ensuring a truthy value, ens

From http://davidwalsh.name/essential-javascript-functions

Oftentimes we validate input before moving forward; ensuring a truthy value, ensuring forms data is valid, etc. But how often do we ensure an element qualifies for moving forward? You can use a matchesSelector function to validate if an element is of a given selector match:

matchesSelector.js
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function matchesSelector(el, selector) {
	var p = Element.prototype;
	var f = p.matches || p.webkitMatchesSelector || p.mozMatchesSelector || p.msMatchesSelector || function(s) {
		return [].indexOf.call(document.querySelectorAll(s), this) !== -1;
	};
	return f.call(el, selector);
}

// Usage
matchesSelector(document.getElementById('myDiv'), 'div.someSelector[some-attribute=true]')