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HTML

              
                <!--PEN CODE-->
<div id="tasker" class="tasker">
	<div id="error" class="error">Please enter a task</div>
	<div id="tasker-header" class="tasker-header">
		<input type="text" id="input-task" placeholder="Enter a task">
		<button id="add-task-btn"><i class="fa fa-fw fa-plus"></i>
		</button>
	</div>
	<div class="tasker-body">
		<ul id="tasks"></ul>
	</div>
</div>
<!--END PEN CODE-->
              
            
!

CSS

              
                $primary: #313e50;
$grey: #cdcdcd;
$secondary: #1dd2af;

%reset {
	margin: 0;
	padding: 0;
	border: none;
	outline: none;
	background: transparent;
}

%transition {
	transition: all 0.2s ease;
	-webkit-transition: all 0.2s ease;
}

body {
	background: #f1f1f1;
	margin-top: 2rem;
}

/*PEN STYLES*/
.tasker {
	max-width: 400px;
	margin: 0 auto;
	.error {
		display: none;
		background: rgba(237, 28, 36, 0.7);
		color: #fff;
		padding: 14px;
		margin-bottom: 10px;
		border-radius: 5px;
		text-align: center;
	}

	ul {
		@extend %reset;
		background: #fff;
	}

	li,
	.error,
	button,
	input {
		@extend %reset;
		font: 18px/1.25em Helvetica, Arial, Sans-serif;
	}
}

.tasker-header {
	display: inline-flex;
	background: $primary;
	justify-content: space-between;
	width: 100%;
	input,
	button {
		color: #fff;
		box-sizing: border-box;
		font-size: 1.25em;
		padding: 14px;
	}

	input {
		flex-grow: 2;
	}

	button {
		@extend %transition;
		background: $secondary;
		border-left: 1px solid ($secondary * 1.05);
		&:hover {
			background: $secondary * 1.1;
		}
	}
}

.tasker-body {
	.task {
		display: block;
		position: relative;
		padding: 14px 40px 14px 14px;
		border-bottom: 1px solid rgba(0, 0, 0, 0.1);
		&:last-child {
			border-bottom: none;
		}

		&:hover > button {
			opacity: 1;
		}

		&.completed {
			color: $grey;
			text-decoration: line-through;
		}

		input {
			margin-right: 10px;
		}

		button {
			@extend %transition;
			color: $grey;
			margin: 14px;
			position: absolute;
			top: 0;
			right: 0;
			opacity: 0;
			&:hover {
				color: #ed1c24;
			}
		}
	}
}
              
            
!

JS

              
                (function() {
	'use strict';
	var tasker = {
		init: function() {
			this.cacheDom();
			this.bindEvents();
			this.evalTasklist();
		},
		cacheDom: function() {
			this.taskInput = document.getElementById("input-task");
			this.addBtn = document.getElementById("add-task-btn");
			this.tasklist = document.getElementById("tasks");
			this.tasklistChildren = this.tasklist.children;
			this.errorMessage = document.getElementById("error");
		},
		bindEvents: function() {
			this.addBtn.onclick = this.addTask.bind(this);
			this.taskInput.onkeypress = this.enterKey.bind(this);
		},
		evalTasklist: function() {
			var i, chkBox, delBtn;
			//BIND CLICK EVENTS TO ELEMENTS
			for (i = 0; i < this.tasklistChildren.length; i += 1) {
				//ADD CLICK EVENT TO CHECKBOXES
				chkBox = this.tasklistChildren[i].getElementsByTagName("input")[0];
				chkBox.onclick = this.completeTask.bind(this, this.tasklistChildren[i], chkBox);
				//ADD CLICK EVENT TO DELETE BUTTON
				delBtn = this.tasklistChildren[i].getElementsByTagName("button")[0];
				delBtn.onclick = this.delTask.bind(this, i);
			}
		},
		render: function() {
			var taskLi, taskChkbx, taskVal, taskBtn, taskTrsh;
			//BUILD HTML
			taskLi = document.createElement("li");
			taskLi.setAttribute("class", "task");
			//CHECKBOX
			taskChkbx = document.createElement("input");
			taskChkbx.setAttribute("type", "checkbox");
			//USER TASK
			taskVal = document.createTextNode(this.taskInput.value);
			//DELETE BUTTON
			taskBtn = document.createElement("button");
			//TRASH ICON
			taskTrsh = document.createElement("i");
			taskTrsh.setAttribute("class", "fa fa-trash");
			//INSTERT TRASH CAN INTO BUTTON
			taskBtn.appendChild(taskTrsh);

			//APPEND ELEMENTS TO TASKLI
			taskLi.appendChild(taskChkbx);
			taskLi.appendChild(taskVal);
			taskLi.appendChild(taskBtn);

			//ADD TASK TO TASK LIST
			this.tasklist.appendChild(taskLi);

		},
		completeTask: function(i, chkBox) {
			if (chkBox.checked) {
				i.className = "task completed";
			} else {
				this.incompleteTask(i);
			}
		},
		incompleteTask: function(i) {
			i.className = "task";
		},
		enterKey: function(event) {
			if (event.keyCode === 13 || event.which === 13) {
				this.addTask();
			}
		},
		addTask: function() {
			var value = this.taskInput.value;
			this.errorMessage.style.display = "none";

			if (value === "") {
				this.error();
			} else {
				this.render();
				this.taskInput.value = "";
				this.evalTasklist();
			}
		},
		delTask: function(i) {
			this.tasklist.children[i].remove();
			this.evalTasklist();
		},
		error: function() {
			this.errorMessage.style.display = "block";
		}
	};

	tasker.init();
}());
              
            
!
999px

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