todolist_高级写法

<!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！">
    <title>ToDoList</title>
    <style type="text/css">
        body {
            margin:0;
            padding:0;
            font-size:16px;
            background: #CDCDCD;
        }
        header {
            height:50px;
            background:#333;
            background:rgba(47,40,45,0.70);
        }
        section{
            margin:0 auto;
        }
        label{
            float:left;
            100px;
            line-height:50px;
            color:#DDD;
            font-size:24px;
            cursor:pointer;
            font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
        }
        header input{
            float:right;
            60%;
            height:24px;
            margin-top:12px;
            /*首行缩进*/
            text-indent:10px;
            border-radius:5px;
            /*向框添加一个或多个阴影。该属性是由逗号分隔的阴影列表，每个阴影由 2-4 个长度值、可选的颜色值以及可选的 inset 关键词来规定。省略长度的值是 0*/
            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{
            /*属性设置元素整个轮廓的宽度，只有当轮廓样式不是 none 时，这个宽度才会起作用*/
            outline-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;
            22px;
            height:22px;
            cursor:pointer;
        }
        p{
            margin: 0;
        }
        li p input{
            top:3px;
            left:40px;
            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);
        }
        ol li{
            cursor:move;
        }
        ul li{
            border-left: 5px solid #999;
            /*不透明度*/
            opacity: 0.5;
        }
        li a{
            position:absolute;
            top:2px;
            right:5px;
            display:inline-block;
            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;
        }
        /*页面宽度等于620时候执行里面代码*/
        @media screen and (max-device- 620px) {
            section{96%;padding:0 2%;}
        }
        /*当浏览器尺寸大于620px时候的代码了*/
        @media screen and (min- 620px) {
            section{600px;padding:0 10px;}
        }
    </style>
</head>
<body>
<header>
    <section>
        <form action="javascript:postaction()" id="form">
            <label for="title">ToDoList</label>
            
            <input type="text" id="title" name="title" placeholder="添加ToDo" required="required" autocomplete="off">
        </form>
    </section>
</header>
<section>
    <h2 onclick="save()">正在进行 <span id="todocount">0</span></h2>
    <ol id="todolist" class="demo-box"></ol>
    <h2>已经完成 <span id="donecount">0</span></h2>
    <ul id="donelist"></ul>
</section>
<footer>
    Copyright © 2014 todolist.cn <a href="javascript:clear();">clear</a>
</footer>
<script type="text/javascript">
function clear(){
    // localStorage本地存储
   localStorage.clear();
   load();
}

function postaction(){
   var title = document.getElementById("title");
   if(title.value == "") {
       alert("内容不能为空");
   }else{
       var data=loadData();
       var todo={"title":title.value,"done":false};
       data.push(todo);
       saveData(data);
       var form=document.getElementById("form");
       form.reset();
       load();
   }
}

function loadData(){
   var collection=localStorage.getItem("todo");
   if(collection!=null){
       return JSON.parse(collection);
   }
   else return [];
}

function saveSort(){
   var todolist=document.getElementById("todolist");
   var donelist=document.getElementById("donelist");
   var ts=todolist.getElementsByTagName("p");
   var ds=donelist.getElementsByTagName("p");
   var data=[];
   for(i = 0;i < ts.length; i++){
       var todo={"title":ts[i].innerHTML,"done":false};
       // unshift() 方法可向数组的开头添加一个或更多元素，并返回新的长度。
       data.unshift(todo);
   }
   for(i = 0;i < ds.length; i++){
       var todo={"title":ds[i].innerHTML,"done":true};
       data.unshift(todo);
   }
   saveData(data);
}

function saveData(data){
    // JSON.stringify()把对象的类型转换为字符串类型
   localStorage.setItem("todo",JSON.stringify(data));
}

function remove(i){
   var data=loadData();
   var todo=data.splice(i,1)[0];// 从i开始删除一个元素
   saveData(data);
   load();
}

function update(i,field,value){
   var data = loadData();
   var todo = data.splice(i,1)[0];
   todo[field] = value;
   data.splice(i,0,todo);
   saveData(data);
   load();
}

function edit(i)
{
   load();
   var p = document.getElementById("p-"+i);
   title = p.innerHTML;
   p.innerHTML="<input id='input-"+i+"' value='"+title+"' />";
   var input = document.getElementById("input-"+i);
   input.setSelectionRange(0,input.value.length); // 选中value内容
   input.focus();
   input.onblur =function(){
       if(input.value.length == 0){
           p.innerHTML = title;
           alert("内容不能为空");
       }
       else{
           update(i,"title",input.value);
       }
   };
}

function load(){
   var todolist=document.getElementById("todolist");
   var donelist=document.getElementById("donelist");
   var collection=localStorage.getItem("todo");
   if(collection!=null){
       var data=JSON.parse(collection);
       var todoCount=0;
       var doneCount=0;
       var todoString="";
       var doneString="";
       for (var i = data.length - 1; i >= 0; i--) {
           if(data[i].done){
               doneString+="<li draggable='true'><input type='checkbox' onchange='update("+i+","done",false)' checked='checked' />"
               +"<p id='p-"+i+"' onclick='edit("+i+")'>"+data[i].title+"</p>"
               +"<a href='javascript:remove("+i+")'>-</a></li>";
               doneCount++;
           }
           else{
               todoString+="<li draggable='true'><input type='checkbox' onchange='update("+i+","done",true)' />"
               +"<p id='p-"+i+"' onclick='edit("+i+")'>"+data[i].title+"</p>"
               +"<a href='javascript:remove("+i+")'>-</a></li>";
               todoCount++;
           }
       };
       todocount.innerHTML=todoCount;
       todolist.innerHTML=todoString;
       donecount.innerHTML=doneCount;
       donelist.innerHTML=doneString;
   }
   else{
       todocount.innerHTML=0;
       todolist.innerHTML="";
       donecount.innerHTML=0;
       donelist.innerHTML="";
   }

   var lis=todolist.querySelectorAll('ol li'); // 返回li元素的集合
   [].forEach.call(lis, function(li) {
       li.addEventListener('dragstart', handleDragStart, false);
       li.addEventListener('dragover', handleDragOver, false);
       li.addEventListener('drop', handleDrop, false);

       onmouseout =function(){
           saveSort();
       };
   });
}

window.onload=load;

window.addEventListener("storage",load,false);

var dragSrcEl = null;
function handleDragStart(e) {
    dragSrcEl = this;
    e.dataTransfer.effectAllowed = 'move';
    e.dataTransfer.setData('text/html', this.innerHTML);
}
function handleDragOver(e) {
    if (e.preventDefault) {
        e.preventDefault();
    }
    e.dataTransfer.dropEffect = 'move';
    return false;
}
function handleDrop(e) {
    if (e.stopPropagation) {
        e.stopPropagation();
    }
    if (dragSrcEl != this) {
        dragSrcEl.innerHTML = this.innerHTML;
        this.innerHTML = e.dataTransfer.getData('text/html');
    }
    return false;
}

</script>

</body>
</html>

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原文地址：https://www.cnblogs.com/fmgao-technology/p/9277908.html