todos+增删改查+js练习

增删改查+js练习+es6字符串模板@haloBabyBear

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>todos</title>

     <style>

         *{

             margin:0;

             padding:0;

         }

         #content{

             position:absolute;

             top:50%;

             left:50%;

             transform:translate(-200px,-200px);

         }

         #input{

             width:395px;

             height: 30px;

             margin-bottom:10px;

         }

         #infoBox{

             width:400px;

             height:300px;

             border:1px solid #000;

         }

         ul{

             list-style-type: none;

         }

         .hide{

             display: none;

         }

     </style>

 </head>

 <body>

 <div id="content">

     <input type="text" id="input"/>

     <ul id="infoBox">

     </ul>

 </div>

 <script src="todos.js"></script>

 </body>

 </html>

 /**

  *

  */

 var data = [{"name":"item1","id":11},{"name":"item2","id":22}];

 var input = document.getElementById("input");

 var info =document.getElementById("infoBox");

 //li对象

 var lis = document.getElementsByTagName('li');

 var txtName = document.getElementsByClassName("txtName");

 var editInput = document.getElementsByClassName("editInput");

 //初始化数据，及添加时调用

 function init(data){

     var fragment = document.createDocumentFragment();

     data.forEach(function aa(item){

         var li = document.createElement("li");

         li.innerHTML = `<span class="txtName"  data-id="${item.id}"  data-name="${item.name}" ondblclick="edit(${item.id})">${item.name}</span>

                         <input class="editInput hide" type="text" value="${item.name}" onblur="editFinished(${item.id})"/>

                         <span data-id="${item.id}" style='float:right;cursor: pointer' onclick='remove(${item.id})'>X</span>`;

         // li.setAttribute("data-id",item.id);

         li.style ="margin-top:10px";

         fragment.appendChild(li);

     });

     info.appendChild(fragment);

 }

 //页面加载好加载数据

 window.onload = init(data);

    function remove(id){

        for(var i=0;i<lis.length;i++){

            if(lis[i] != null){

                //删除元素 元素.parentNode.removeChild(元素);

                if (lis[i].childNodes[4].dataset.id == id +"")

                    lis[i].parentNode.removeChild( lis[i]);

            }

        }

    }

    function add(){

        var idNum =  Math.floor(100*Math.random());

        //设置新的数组，数组长度一直为1

        var newElement = [];//清空

        newElement.push({"name":input.value,id:idNum});

        data.push({"name":input.value,id:idNum});//infoBox中渲染的数据中添加新数据

        init(newElement);//添加新数据

        console.log(data);

        return data;//返回所有数据

    }

 //编辑

 function edit(id){

     for(var i=0;i<txtName.length;i++){

             if(txtName[i].dataset.id == id + ""){

                 txtName[i].className = "txtName hide";

                 editInput[i].className = "editInput";

             }

     }

 }

 //编辑成功

 function editFinished(id){

     for(var i=0;i<txtName.length;i++){

         if(txtName[i].dataset.id == id + ""){

             var temp = txtName[i].dataset.name;

             if (editInput[i].value === ''){

                 txtName[i].className = "txtName";

                 editInput[i].className = "editInput hide";

                 txtName[i].innerHTML = temp;

                 alert("为空时不改变");

             }

             else{

                 txtName[i].className = "txtName";

                 editInput[i].className = "editInput hide";

                 txtName[i].innerHTML = editInput[i].value;

                 alert("编辑成功");

             }

         }

     }

 }

 input.addEventListener('keydown', function(ev) {

     //按键为回车键时执行

     if (ev.keyCode === 13) {

         //输入为空时不执行添加操作

     if (input.value === '') return;

     //添加数据

     add();

     //清空数据

     input.value = '';

     }

     else {

     //延时搜索

     setTimeout(function() {

         search(input.value);

     }, 10)

     }

 });

 function search($str){

     for(var i=0;i<txtName.length;i++){

         //ig全局匹配，不区分大小写

          var reg = new RegExp("(" + $str + ")", "ig");

          var temp = txtName[i].dataset.name;

          //$1指原始字符串

         //高亮要查找的字符串

          temp = temp.replace(reg,"<span style='color:red'>$1</span>");

          txtName[i].innerHTML = temp;

     }

 }

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todos+增删改查+js练习

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