How to create: to-do list

Learn how to use CSS and JavaScript to create a 'to-do list'.

Create a to-do list

Step 1 - Add HTML:

<div id="myDIV" class="header">
  <h2>My To Do List</h2>
  <input type="text" id="myInput" placeholder="Title...">
  <span onclick="newElement()" class="addBtn">Add</span>
</div>
<ul id="myUL">
  <li>Hit the gym</li>
  <li class="checked">Pay bills</li>
  <li>Meet George</li>
  <li>Buy eggs</li>
  <li>Read a book</li>
  <li>Organize office</li>
</ul>

Step 2 - Add CSS:

Set the style for the title and list:

/* Include padding and border in the total width and height of the element */
* {
  box-sizing: border-box;
}
/* Remove margin and padding from the list */
ul {
  margin: 0;
  padding: 0;
}
/* Set the style for list items */
ul li {
  cursor: pointer;
  position: relative;
  padding: 12px 8px 12px 40px;
  background: #eee;
  font-size: 18px;
  transition: 0.2s;
  /* Make list items unselectable */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
/* Set all odd list items to a different color (zebra striping) */
ul li:nth-child(odd) {
  background: #f9f9f9;
}
/* Mouse hover changes background color to darker */
ul li:hover {
  background: #ddd;
}
/* Click to add background color and strike through text */
ul li.checked {
  background: #888;
  color: #fff;
  text-decoration: line-through;
}
/* Add 'selected' mark when clicked */
ul li.checked::before {
  content: '';
  position: absolute;
  border-color: #fff;
  border-style: solid;
  border-width: 0 2px 2px 0;
  top: 10px;
  left: 16px;
  transform: rotate(45deg);
  height: 15px;
  width: 7px;
}
/* Set the style for the close button */
.close {
  position: absolute;
  right: 0;
  top: 0;
  padding: 12px 16px 12px 16px;
}
.close:hover {
  background-color: #f44336;
  color: white;
}
/* Set the style for the title */
.header {
  background-color: #f44336;
  padding: 30px 40px;
  color: white;
  text-align: center;
}
/* Clear the float after the title */
.header:after {
  content: "";
  display: table;
  clear: both;
}
/* Set the style for the input field */
input {
  margin: 0;
  border: none;
  border-radius: 0;
  width: 75%;
  padding: 10px;
  float: left;
  font-size: 16px;
}
/* Set the style for the 'add' button */
.addBtn {
  padding: 10px;
  width: 25%;
  background: #d9d9d9;
  color: #555;
  float: left;
  text-align: center;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
  border-radius: 0;
}
.addBtn:hover {
  background-color: #bbb;
}

Step 3 - Add JavaScript:

// Create a 'close' button for each list item and attach it to each list item
var myNodelist = document.getElementsByTagName("LI");
var i;
for (i = 0; i < myNodelist.length; i++) {
  var span = document.createElement("SPAN");
  var txt = document.createTextNode("\u00D7");
  span.className = "close";
  span.appendChild(txt);
  myNodelist[i].appendChild(span);
}
// 单击关闭按钮以隐藏当前列表项
var close = document.getElementsByClassName("close");
var i;
for (i = 0; i < close.length; i++) {
  close[i].onclick = function() {
    var div = this.parentElement;
    div.style.display = "none";
  }
}
// 单击列表项时添加一个“已选中”符号
var list = document.querySelector('ul');
list.addEventListener('click', function(ev) {
  if (ev.target.tagName === 'LI') {
    ev.target.classList.toggle('checked');
  }
}, false);
// 单击“添加”按钮时创建一个新的列表项
function newElement() {
  var li = document.createElement("li");
  var inputValue = document.getElementById("myInput").value;
  var t = document.createTextNode(inputValue);
  li.appendChild(t);
  if (inputValue === '') {
    alert("You must write something!");
  } else {
    document.getElementById("myUL").appendChild(li);
  }
  document.getElementById("myInput").value = "";
  var span = document.createElement("SPAN");
  var txt = document.createTextNode("\u00D7");
  span.className = "close";
  span.appendChild(txt);
  li.appendChild(span);
  for (i = 0; i < close.length; i++) {
    close[i].onclick = function() {
      var div = this.parentElement;
      div.style.display = "none";
    }
  }
}

Try It Yourself