今天为大家用juqery实现一下列表的增删改查
先给大家看一下运行的效果图
接下来放上实现这个效果的代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
.wrapper {
width: 600px;
margin: 0 auto;
}
.modal {
width: 100%;
height: 100vh;
background-color: rgba(0, 0, 0, 0.5);
position: absolute;
display: none;
}
.modal .form {
width: 500px;
height: 300px;
background-color: #fff;
position: absolute;
left: 0;
top: 0;
right: 0;
bottom: 0;
margin: auto;
padding: 20px;
box-sizing: border-box;
}
.modal .form input {
width: 100%;
height: 35px;
margin-bottom: 20px;
}
.modal div span:nth-of-type(2) {
float: right;
}
.modal .form div:nth-of-type(4) {
width: 100%;
text-align: center;
}
</style>
</head>
<body>
<!-- 模态窗 -->
<div class="modal">
<div class="form">
<!-- 隐式接收修改的id值用于修改 -->
<input type="hidden" value="" class="active">
<div><span>修改记录</span><span class="closeModal">X</span></div>
<hr>
<div><input type="text" class="username" placeholder="用户名"></div>
<div><input type="password" class="pwd" placeholder="密码"></div>
<div><button class="closeModal">关闭</button>  <button class="addInfo">确认</button></div>
</div>
</div>
<div class="wrapper">
<div>
<input type="search" value="">
<button class="search">查询</button>
<button class="add">增加</button>
</div>
<div class="tb">
<table border="1" width="500">
<thead>
<tr>
<th>id</th>
<th>username</th>
<th>password</th>
<th></th>
</tr>
</thead>
<tbody>
<!-- <tr>
<td>1</td>
<td>张三</td>
<td>123456</td>
<td>
<button class="update">修改</button>
<button class="del">删除</button>
</td>
</tr> -->
</tbody>
</table>
</div>
</div>
<script src="./js/jquery-3.6.0.js"></script>
<script>
$(function() {
//点击增加按钮
$(".add").click(function() {
showModal();
})
//点击关闭和X
$(".closeModal").click(function() {
closeMdal();
})
//点击确认
$(".addInfo").click(function() {
//判断是添加操作还是修改
var id = $(".active").val();
if (id == "") {
addInfo(); //添加操作
} else {
//修改操作
updateInfo(id)
}
//渲染操作
showInfo();
//关闭
closeMdal();
})
//点击删除
$("tbody").on("click", ".del", function() {
var id = $(this).parent().parent().children().eq(0).text();
//删除方法
delInfo(id);
//渲染
showInfo();
})
//点击修改
$("tbody").on("click", ".update", function() {
//显示模态窗
showModal();
//根据id获取对应的对象
userArr = localStorage.userList == undefined ? [] : JSON.parse(localStorage.userList);
var id = $(this).parent().parent().children().eq(0).text();
var user = userArr.find(obj => {
return obj.id == id;
})
//反写
$(".username").val(user.username);
$(".pwd").val(user.password);
$(".active").val(user.id);
})
//点击查询
$(".search").click(function(){
//获取用户输入的关键词
var keywords=$("input[type=search]").val();
//查询后渲染
showInfo(keywords);
//清空
$("input[type=search]").val("");
})
//关闭模态窗
function closeMdal() {
$(".modal").fadeOut();
$(".username").val("");
$(".pwd").val("");
$(".active").val("");
}
//显示模态窗
function showModal() {
$(".modal").fadeIn();
}
//获取当前最新的唯一标识
var nextId = localStorage.nextId == undefined ? 0 : localStorage.nextId * 1;
var userArr; //列表数组
//添加操作
function addInfo() {
userArr = localStorage.userList == undefined ? [] : JSON.parse(localStorage.userList);
var username = $(".username").val();
var password = $(".pwd").val();
//封装为对象放入数组
var obj = {
id: nextId++,
username: username,
password: password
}
//添加到数组
userArr.push(obj);
//重新更新到本地
localStorage.userList = JSON.stringify(userArr);
//更新id
localStorage.nextId = nextId;
}
//渲染操作
showInfo(); //第一次进来渲染
function showInfo(keywords) {
//每次渲染前先清空
$("tbody").html("");
userArr = localStorage.userList == undefined ? [] : JSON.parse(localStorage.userList);
//如果是条件查询，就过滤出符合条件的数组
if(keywords!=undefined){
userArr=userArr.filter(obj=>{
return obj.username.includes(keywords);
})
}
userArr.forEach(obj => {
$("tbody").prepend(` <tr>
<td>${obj.id}</td>
<td>${obj.username}</td>
<td>${obj.password}</td>
<td>
<button class="update">修改</button>
<button class="del">删除</button>
</td>
</tr>`)
})
}
//删除操作
function delInfo(id) {
userArr = localStorage.userList == undefined ? [] : JSON.parse(localStorage.userList);
//根据id找到对应的index
var index = userArr.findIndex(obj => {
return obj.id == id;
})
//根据index删除
userArr.splice(index, 1);
//重新更新到本地
localStorage.userList = JSON.stringify(userArr);
}
//修改操作
function updateInfo(id) {
userArr = localStorage.userList == undefined ? [] : JSON.parse(localStorage.userList);
var user = userArr.find(obj => {
return obj.id == id;
})
user.username=$(".username").val();
user.password=$(".pwd").val();
//重新更新到本地
localStorage.userList = JSON.stringify(userArr);
}
})
</script>
</body>
</html>
这个运用到了本地存储和jquery，大家用之前记得下载一下jQuery的代码哦！