Code implementation:
ToDoList.html (copy and save as html file, open to see the effect):
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<title>ToDoList-the simplest to-do list</title>
<link rel="stylesheet" href="https://blog-static.cnblogs.com/files/jacklzx/ToDoList.css">
<script src="//i2.wp.com/blog-static.cnblogs.com/files/jacklzx/jquery.min.js"></script>
<script src="//i2.wp.com/blog-static.cnblogs.com/files/jacklzx/ToDoList.js"></script>
</head>
<body>
<header>
<section>
<label for="title">ToDoList</label>
<input type="text" id="title" name="title" placeholder="Please enter ToDo" required="required" autocomplete="off" />
</section>
</header>
<section>
<h2>In Progress <span id="todocount"></span></h2>
<ol id="todolist" class="demo-box">
</ol>
<h2>Completed <span id="donecount"></span></h2>
<ul id="donelist">
</ul>
</section>
</body>
</html>
ToDoList.css:
body {
margin: 0;
padding: 0;
font-size: 16px;
background: #CDCDCD;
}
header {
height: 50px;
background: #333;
background: rgba(47, 47, 47, 0.98);
}
section {
margin: 0 auto;
}
label {
float: left;
width: 100px;
line-height: 50px;
color: #DDD;
font-size: 24px;
cursor: pointer;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
header input {
float: right;
width: 60%;
height: 24px;
margin-top: 12px;
text-indent: 10px;
border-radius: 5px;
box-shadow: 0 1px 0 rgba(255, 255, 255, 0.24), 0 1px 6px rgba(0, 0, 0, 0.45) inset;
border: none
}
input:focus {
outline-width: 0
}
h2 {
position: relative;
}
span {
position: absolute;
top: 2px;
right: 5px;
display: inline-block;
padding: 0 5px;
height: 20px;
border-radius: 20px;
background: #E6E6FA;
line-height: 22px;
text-align: center;
color: #666;
font-size: 14px;
}
ol,
ul {
padding: 0;
list-style: none;
}
li input {
position: absolute;
top: 2px;
left: 10px;
width: 22px;
height: 22px;
cursor: pointer;
}
p {
margin: 0;
}
li p input {
top: 3px;
left: 40px;
width: 70%;
height: 20px;
line-height: 14px;
text-indent: 5px;
font-size: 14px;
}
li {
height: 32px;
line-height: 32px;
background: #fff;
position: relative;
margin-bottom: 10px;
padding: 0 45px;
border-radius: 3px;
border-left: 5px solid #629A9C;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.07);
}
olli {
cursor: move;
}
ulli {
border-left: 5px solid #999;
opacity: 0.5;
}
li a {
position: absolute;
top: 2px;
right: 5px;
display: inline-block;
width: 14px;
height: 12px;
border-radius: 14px;
border: 6px double #FFF;
background: #CCC;
line-height: 14px;
text-align: center;
color: #FFF;
font-weight: bold;
font-size: 14px;
cursor: pointer;
}
footer {
color: #666;
font-size: 14px;
text-align: center;
}
footer a {
color: #666;
text-decoration: none;
color: #999;
}
@media screen and (max-device-width: 620px) {
section {
width: 96%;
padding: 0 2%;
}
}
@media screen and (min-width: 620px) {
section {
width: 600px;
padding: 0 10px;
}
}
ToDoList.js
$(function() {
// Every time the page is loaded, the data is automatically rendered.
load();
$("#title").on("keydown", function(event) {
// Determine if the user pressed the Enter key (13)
if (event.keyCode == 13) {
if ($(this).val() == "") {
alert("Please enter to-do items!");
} else {
// First read and access the original data locally
var local = getData();
//Append the latest data to local
local.push({ title: $(this).val(), done: false });
//Save local to local storage
saveData(local);
load();
//Delete the text in the input after loading is complete
$(this).val("");
}
}
});
//Delete operation
$("ol,ul").on("click", "a", function() {
// Get local storage
var data = getData();
// change the data
var index = $(this).attr("id");
// console.log(index);
//Element.splice(start from which position to delete, delete a few)
data.splice(index, 1);
//Save to local storage
saveData(data);
// Re-render the page
load();
});
// In progress, completed operation
$("ol,ul").on("click", "input", function() {
var data = getData();
var index = $(this).siblings("a").attr("id");
// console.log(index);
data[index].done = $(this).prop("checked");
saveData(data);
load();
});
//Read locally stored data
function getData() {
var data = localStorage.getItem("todolist");
if (data !== null) {
// The data format for local storage is string and needs to be converted into an object.
return JSON.parse(data);
} else {
return [];
}
}
//Save local storage data
function saveData(data) {
//Convert to string before storage
localStorage.setItem("todolist", JSON.stringify(data));
}
// Render and load data
function load() {
var data = getData();
// console.log(data);
// Clear the contents of ol and ul before traversing
$("ol,ul").empty();
var todoCount = 0; // Number of items in progress
var doneCount = 0; // Number of completed items
// Traverse the data data
$.each(data, function(i, n) {
// console.log(n);
//Append data and create a custom id index number
if (n.done) {
$("ul").prepend("<li><input type='checkbox' checked='checked'> <p>" + n.title + "</p> <a href='javascript:;' id=" + i + "></a></li>");
doneCount + + ;
} else {
$("ol").prepend("<li><input type='checkbox'> <p>" + n.title + "</p> <a href='javascript:;' id=" + i + "></a></li>");
todoCount + + ;
}
});
//Modify the displayed number
$("#todocount").text(todoCount);
$("#donecount").text(doneCount);
}
});