如何 - 创建待办事项列表

了解如何使用 CSS 和 JavaScript 创建"to-do list"。

任务列表

使用 CSS 和 JavaScript 创建"to-do list" 来组织任务并确定其优先级。

创建待办事项列表

步骤1）添加HTML：

示例

<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>

步骤2）添加CSS：

设置标题和列表的样式：

示例

/* Include the padding and border in an element's total width and height */
* {
  box-sizing: border-box;
}

/* Remove margins and padding from the list */
ul {
margin: 0;
  padding: 0;
}

/* Style the list items */
ul li {
  cursor: pointer;
position: relative;
padding: 12px 8px 12px 40px;
background: #eee;
  font-size: 18px;
  transition: 0.2s;

  /* make the 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-stripes) */
ul li:nth-child(odd) {
  background: #f9f9f9;
}

/* Darker background-color on hover */
ul li:hover {
  background: #ddd;
}

/* When clicked on, add a background color and strike out text */
ul li.checked {
  background: #888;
  color: #fff;
text-decoration: line-through;
}

/* Add a "checked" mark when clicked on */
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;
}

/* Style the close button */
.close {
position: absolute;
  right: 0;
  top: 0;
padding: 12px 16px 12px 16px;
}

.close:hover {
background-color: #f44336;
color: white;
}

/* Style the header */
.header {
background-color: #f44336;
padding: 30px 40px;
color: white;
  text-align: center;
}

/* Clear floats after the header */
.header:after {
content: "";
  display: table;
  clear: both;
}

/* Style the input */
input {
  margin: 0;
  border: none;
  border-radius: 0;
  width: 75%;
  padding: 10px;
  float: left;
  font-size: 16px;
}

/* Style 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;
}

步骤 3) 添加 JavaScript：

示例

// Create a "close" button and append 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);
}

// Click on a close button to hide the current list item
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";
}
}

// Add a "checked" symbol when clicking on a list item
var list = document.querySelector('ul');
list.addEventListener('click', function(ev) {
if (ev.target.tagName === 'LI') {
    ev.target.classList.toggle('checked');
}
}, false);

// Create a new list item when clicking on the "Add" button
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";
    }
}
}

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