SOURCE

var sidebarMotion={
	toggleEl: document.getElementById("toggle"),
	sidebarEl: document.getElementsByClassName("sidebar")[0],
	init: function(){
		this.toggleEl.addEventListener("click", this.clickHandle.bind(this), false);
	},
	clickHandle: function(){
		console.log(this);
		this.showSidebar();
	},
	showSidebar: function(){
		this.sidebarEl.style.display = "block";
	}
}
sidebarMotion.init();

<button type="button" id="toggle">click</button>
<div class="sidebar"></div>

.sidebar {
	height: 20px;
	width: 20px;
	background-color: #222;
	display: none;
}