Simple text input > preview

text-preview.js

var textPreview = function (el) {

    var self = this,
		input,
		output,

	initialise = function() {

		input = el.querySelector('input') || el.querySelector('textarea'),
		target = el.getAttribute('data-textPreview-output-element'),
		output = document.body.querySelector('[data-textPreview-output="' + target + '"]') || null;
		input.addEventListener('keyup', function(){
			outputText();
		});
		input.onpaste = outputText();

	},

	outputText = function(){
		var value = input.value;
			output.innerHTML = value;
	};

	initialise();

	return this;
};