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[Fine talk] Using native js to implement todolist

2022-08-03 04:37:00 【Create splendid - hand in hand with you】

通过原生js实现todolist：

第一部分：css样式部分

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; border: none;}
p{margin: 0;}
li p input{top:3px;left:40px;width:70%;height:20px;line-height:14px;text-indent:6px;font-size:14px;}
li p input:focus{outline:1px solid #000;margin-top:2px;}
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);}
ol li{cursor:move;}
ul li{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;}}

HTML内容部分：

<!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—最简单的待办事项列表</title>
       <meta name="description" content="ToDoList无须注册即可使用,数据存储在用户浏览器的html5本地数据库里,是最简单最安全的待办事项列表应用！" />
       <link rel="stylesheet" type="text/css" href="./css/index.css"/>
   </head>
   <body>
       <header>
           <section>
<form action="" id="form" οnclick="">
               <input type="text" id="title" value="" name="title" placeholder="添加ToDo" required="required" autocomplete="off" />
</form>
           </section>
       </header>
       <section>
           <h2>正在进行 <span id="todocount"></span></h2>
           <ol id="todolist" class="demo-box">
           </ol>
           <h2>已经完成 <span id="donecount"></span></h2>
           <ul id="donelist">
           </ul>
       </section>
       <footer>
           Copyright © 2014 todolist.cn <a href="javascript:clear();">clear</a>
       </footer>
       <script type="text/javascript" src="js/index.js"></script>
   </body>
</html>

js内容部分：

var title = document.querySelector("#title");
var ol = document.querySelector("#todolist");
var ul = document.querySelector("#donelist");
locd()
// Enter to store the data
title.addEventListener('keyup',function(e){
   // This is so called because each execution needs to save the data to the array once
   var arr = getData()
   // 这里必须使用e.keyCode否则失效
   if(e.keyCode == 13){
   var todo = {
       title:title.value,
       done:false
   }
   // 根据 getData() The retrieved data returns the value,After calling this function, store the data in the array
   arr.push(todo);
   // 传入一个实参
   cunchu(arr);
// 获取form表单验证
   // var form = document.querySelector('#form')
   // // reset()is the reset property Reset the form submit content here
   // form.reset()
   var form = document.querySelector('#form')
   form.reset()
   locd()
   }
})
// 存储数据
function cunchu(shuzu){
   // 将数据存起来
   window.localStorage.setItem('todo',JSON.stringify(shuzu))
}
// 获取数据
function getData(){
   // 之所以将localStorage.getItem('todo')放置在该位置 For fetching stored data Convert the data to a string format
var data = window.localStorage.getItem('todo')
// 通过上面data The acquired value is judged below,(The value obtained is not null(means parseable),那么就执行第一个,否则执行第二个)
if(data != null){
   // 解析dataThe value obtained is a character type/数组
   return JSON.parse(data)
}else{
   // If the value is obtained 不为数组 Then first return an array and put the data in the array
   return []
}
}
// 加载数据
function locd(){
   //获取页面标签
   var todocount = document.querySelector("#todocount")
   var donecount = document.querySelector('#donecount')
   // 设置num1与num2The starting values are all empty
   var num1=0;
   var num2=0;
   // Each call to make the pageol,ulThe inner children are all emptied once
   ol.innerHTML='';
   ul.innerHTML='';
   // Call the fetched data traversalforEach循环随后创建li并且将liThe value in is printed to the page
   var data=getData();
   data.forEach((item,index)=>{
       var li=document.createElement('li')
li.innerHTML= `<input type="checkbox" /><p id="p${index}">${item.title}</p><a href="javascript:;" id="${index}">-</a>`
   // 判断item中的值是true还是false
   if(item.done){
       // 是true,Description has been clicked,则将数据传入ul列表中去
       ul.insertBefore(li,ul.children[0])
       li.children[0].checked = 'checked';
       num2++
   }else{
       // 若是falseDescription not clicked,将数据传入ol列表中去
       ol.insertBefore(li,ol.children[0]);
       num1++
   }
   })
   // 通过上面的num1与num2How many children are inside the list can be dynamically calculated
   todocount.innerHTML = num1;
   donecount.innerHTML = num2;
}
// 编辑数据
function bianji(){
   ol.addEventListener('dblclick',function(e){
       var p = e.target;
       if(e.target.nodeName == 'P'){
   p.innerHTML = `<input type="text" value="${p.innerText}" id="input${p.id}">`
   // 点击后,Make each child selected
       p.children[0].select();
       p.children[0].addEventListener('blur',function(e){
           //获取数据
           var shuju = getData();
           // 截取字符串下标是1
           var i = p.id.substring(1);
           // Modify the currently edited data
           shuju[i].title = this.value;
           cunchu(shuju);
           locd()
       })
       }
   })
}
bianji();
// 删除数据
function remove(){
   ol.addEventListener('click',function(e){
       //这里是点击a删除数据所以后面的a需要大写
       var p = e.target;
       if(p.nodeName == 'A'){
           // 调用获取的数据,The specified element can be deleted or inserted into the array、替换元素.这里是删除
           var i = p.id
           var data = getData();
           data.splice(i,1);
           cunchu(data);
           locd()
       }
   })
}
remove();
//The handover is in progress
// 传入两个参数第一个是列表(ol/ul) The second is the incoming value judgment istrue还是false (Applicable to upload and upload switching)
function change(teml,tell){
   teml.addEventListener('click', function(e) {
       var input = e.target
       if (input.nodeName == 'INPUT') {
           var i = input.nextElementSibling.nextElementSibling.id;
           var data = getData();
           data[i].done =tell;
           cunchu(data);
           locd()
       }
   })
}
change(ol,true);
change(ul,false);