Follow my lead

An exercise in clicking outside elements

Click a box to select it, this will add a clickout event handler to the parent element. When that element isn't clicked, it will highlight.

Where the magic happens

		(function(p) {
		// When the body is clicked
		document.body.addEventListener('click', function(e){
			// Find all the DOM elements
			var a = document.getElementsByTagName('*');
			// Loop through those elements
			for (var i = 0; i < a.length; i++)
				// If the element has the property
				if (p in a[i]
				    // And that property is a function
				    && typeof a[i][p] === 'function'
				    // And that element does not contain the clicked element
				    && !a[i].contains(e.target))
				    		// Execute the function on the property
						a[i][p].call(a[i], e);
			});
		})('clickout');