js弹出选择对话框（jsp弹出自定义对话框）
程序员文章站
2023-11-21 22:15:22
分析1.点击弹出框，状态框和遮挡层（背景变灰）就会显示出来 display：block；2.点击关闭按钮，模态框和遮挡层就会隐藏起来 display：none;3.在页面中拖拽的原理：鼠标按下并且移动...
分析
1.点击弹出框，状态框和遮挡层（背景变灰）就会显示出来 display：block；
2.点击关闭按钮，模态框和遮挡层就会隐藏起来 display：none;
3.在页面中拖拽的原理：鼠标按下并且移动，之后松开鼠标
4.触发事件是鼠标按下mousedown，鼠标移动mousemove，鼠标松开mouseup
5.推拽过程：鼠标移动过程中，获得最新的值赋给模态框的left和top值，这样模态框就可以跟着鼠标走了
6.鼠标按下出发的事件源是最上面一行，就是id为title
7.鼠标的坐标减去鼠标在盒子内的坐标，才是真正模态框的位置
8.鼠标按下，我们要得到鼠标在盒子的坐标
9.鼠标移动，就让模态框的坐标设置为：鼠标坐标减去盒子坐标即可，注意移动事件写到按下事件里面
10.鼠标松开，就是停止拖拽，就是可以让鼠标移动事件解除
代码
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>document</title>
<style>
.login-header {
width: 100%;
text-align: center;
height: 30px;
font-size: 24px;
line-height: 30px;
}
* {
padding: 0;
margin: 0;
}
.login {
display: none;
width: 512px;
height: 280px;
position: fixed;
border: #ebebeb solid 1px;
left: 50%;
top: 50%;
background: #ffffff;
box-shadow: 0px 0px 20px #ddd;
z-index: 9999;
transform: translate(-50%, -50%);
}
.login-title {
width: 100%;
margin: 10px 0px 0px 0px;
text-align: center;
line-height: 40px;
height: 40px;
font-size: 18px;
position: relative;
cursor: move;
}
.login-input-content {
margin-top: 20px;
}
.login-button {
width: 50%;
margin: 30px auto 0px auto;
line-height: 40px;
font-size: 14px;
border: #ebebeb 1px solid;
text-align: center;
}
.login-bg {
display: none;
width: 100%;
height: 100%;
position: fixed;
top: 0px;
left: 0px;
background: rgba(0, 0, 0, .3);
}
a {
text-decoration: none;
color: #000000;
}
.login-button a {
display: block;
}
.login-input input.list-input {
float: left;
line-height: 35px;
height: 35px;
width: 350px;
border: #ebebeb 1px solid;
text-indent: 5px;
}
.login-input {
overflow: hidden;
margin: 0px 0px 20px 0px;
}
.login-input label {
float: left;
width: 90px;
padding-right: 10px;
text-align: right;
line-height: 35px;
height: 35px;
font-size: 14px;
}
.login-title span {
position: absolute;
font-size: 12px;
right: -20px;
top: -30px;
background: #ffffff;
border: #ebebeb solid 1px;
width: 40px;
height: 40px;
border-radius: 20px;
}
</style>
</head>
<body>
<div class="login-header"><a id="link" href="javascript:;">点击，弹出登录框</a></div>
<div id="login" class="login">
<div id="title" class="login-title">登录会员
<span><a id="closebtn" href="javascript:void(0);" class="close-login">关闭</a></span>
</div>
<div class="login-input-content">
<div class="login-input">
<label>用户名：</label>
<input type="text" placeholder="请输入用户名" name="info[username]" id="username" class="list-input">
</div>
<div class="login-input">
<label>登录密码：</label>
<input type="password" placeholder="请输入登录密码" name="info[password]" id="password" class="list-input">
</div>
</div>
<div id="loginbtn" class="login-button"><a href="javascript:void(0);" id="login-button-submit">登录会员</a></div>
</div>
<!-- 遮盖层 -->
<div id="bg" class="login-bg"></div>
<script>
var link = document.queryselector('#link'); //获取我们鼠标点击的对象
var login = document.queryselector('.login'); //获得弹出框元素
var mask = document.queryselector('#bg');
var closebtn = document.queryselector('#closebtn');
link.addeventlistener('click', function() {
login.style.display = 'block';
mask.style.display = 'block';
})
closebtn.addeventlistener('click', function() {
login.style.display = 'none';
mask.style.display = 'none';
})
var title = document.queryselector('#title');
title.addeventlistener('mousedown', function(e) {
var x = e.pagex - login.offsetleft;
var y = e.pagey - login.offsettop;
console.log(y);
document.addeventlistener('mousemove', move)
function move(e) {
login.style.left = e.pagex - x + 'px';
login.style.top = e.pagey - y + 'px';
}
document.addeventlistener('mouseup', function() {
document.removeeventlistener('mousemove', move);
})
})
</script>
</body>
</html>