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最近在项目中用到弹出窗口的功能，花了一些时间，就想做一个通用点的弹出窗口，这样大家就可以拿去直接用。如果正好你也需要做一个弹出框的功能，这个代码正适合你。
一、弹窗效果
这个弹出窗是结合了搜集的资料后做出来的，基本的需求都满足了，支持的功能有：自适应，拖动窗口位置，拉动右、下、右下可以实现缩放，可以最大化和还原。大致效果，如下图所示： 
二、HTML 代码
dialog demo
弹出窗口
稻盛和夫，1932年出生于日本鹿儿岛，鹿儿岛大学工学部毕业。27岁创办京都陶瓷株式会社（现名京瓷Kyocera），52岁创办第二电信（原名DDI，现名KDDI，目前在日本为仅次于NTT的第二大通讯公司），这两家公司又都在他的有生之年进入世界500强，两大事业皆以惊人的力道成长。 稻盛和夫的释义是涵盖了生活态度、哲学、思想、伦理观等因素人格。痛惜战后的日本以选择聪明才辩型的人做领导为潮流，忽略了道德规范和伦理标准，导致政界、商界丑闻频发。他建议领导者的选拔标准是德要高于才，也就是居人上者，人格第一，勇气第二，能力第三。他指出热爱是点燃工作激情的火把。无论什么工作，只要全力以赴去做就能产生很大的成就感和自信心，而且会产生向下一个目标挑战的积极性。成功的人往往都是那些沉醉于所做事的人。
三、CSS 代码
* {
font-family: "Helvetica Neue", Helvetica, STHeiTi, sans-serif;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
font-size: 14px;
padding: 0;
margin: 0;
border: 0;
list-style-type: none;
-webkit-tap-highlight-color: rgba(0,0,0,0);
}
img {
border: none;
vertical-align: middle;
}
.hide {
display: none;
}
.left {
float: left;
}
/* 一般按钮 */
.btn {
cursor: pointer;
color: #fff;
border-color: #417FC8;
background: -moz-linear-gradient(top,#4a90e2 0,#4a90e2 100%);
background: -webkit-linear-gradient(top,#4a90e2 0,#4a90e2 100%);
background: -o-linear-gradient(top,#4a90e2 0,#4a90e2 100%);
background: -ms-linear-gradient(top,#4a90e2 0,#4a90e2 100%);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#4A90E2', endColorstr='#4A90E2', GradientType=0);
background: linear-gradient(top,#4a90e2 0,#4a90e2 100%);
border-radius: 3px;
height: 28px;
line-height: 28px;
padding: 0px 10px;
}
/* 弹窗 */
.dialog {
width: 50%;
position: absolute;
top: 10%;
left: 20%;
z-index: 2;
background: white;
border-radius: 3px;
border: 1px solid #eec;
}
/* 弹窗上部 */
.dlg_top {
position: relative;
height: 28px;
z-index: 3;
background: #f3f3f3;
border-top-left-radius: 3px;
border-top-right-radius: 3px;
border-bottom: 1px solid #eec;
cursor: move;
}
/* 弹窗右上角 ico */
.dlg_btn_ico {
float: right;
background: transparent;
background-size: cover;
width: 20px;
height: 20px;
cursor: pointer;
margin-right: 15px;
margin-top: 5px;
background-repeat: no-repeat;
}
/* 弹窗右上角 ico 鼠标浮上去的样式 */
.dlg_btn_ico:hover {
background-color: #eee;
}
/* 最小化 */
/* .dlg_btn_min_top {
background-image: url(../images/ico_min.png);
} */
/* 最大化 */
.dlg_btn_max_top {
background-image: url(../images/ico_max.png);
}
/* 还原 */
.dlg_btn_reback_top {
background-image: url(../images/ico_reback.png);
}
/* 关闭 */
.dlg_btn_close_top {
background-image: url(../images/ico_close.png);
}
/* 左上角logo */
.dlg_logo {
margin-left: 5px;
margin-top: -3px;
width: 20px;
height: 20px;
display: inline-block;
vertical-align: middle;
}
/* 弹窗标题 */
.dlg_title {
line-height: 28px;
margin-left: 5px;
}
/* 弹窗内容 */
.dlg_content {
position: relative;
min-height: 300px;
overflow-y: auto;
margin-right: 4px;
}
/* 弹窗底部 */
.dlg_bottom {
position: absolute;
height: 35px;
width: 100%;
left: 0;
bottom: 0;
z-index: 3;
padding-top: 5px;
background: #f3f3f3;
border-bottom-right-radius: 3px;
border-bottom-left-radius: 3px;
border-top: 1px solid #eec;
text-align: center;
}
/* 缩放时右拉块 */
#dlg_right {
width: 15px;
height: 100%;
float: right;
position: absolute;
right: 0;
top: 0;
cursor: e-resize;
overflow: hidden;
opacity: 0;
z-index: 3;
}
/* 缩放时下拉块 */
#dlg_bottom {
width:100%;
height:15px;
position:absolute;
left:0;
bottom:0;
cursor:n-resize;
overflow:hidden;
opacity:0;
z-index:3;
}
/* 缩放时右下拉块 */
#dlg_right_bottom{
width:15px;
height:15px;
position:absolute;
right:0;
bottom:0;
cursor:nw-resize;
overflow:hidden;
font-size:12px;
text-align:center;
line-height:15px;
float:right;
z-index:4;
}
四、JS 代码
// 最大化时保存弹窗的位置大小
var preDialogWidth = 0;
var preDialogHeight = 0;
var preDialogLeft = "0px";
var preDialogTop = "0px";
// 页面初始化
$(function () {
// 常用功能
$("#btn_show_dialog").bind("click", showDialog);
$(".dlg_btn_close").bind("click", hideDialog);
$("#dlg_submit").bind("click", submitHandler);
// 移动
$("#dialog").bind("mousedown", moveHandler);
// 最大化 || 还原
$(".dlg_btn_max_top").bind("click", maxDialog);
$(".dlg_btn_reback_top").bind("click", rebackDialog);
});
// 还原
function rebackDialog() {
el_dialog = $("#dialog")[0];
el_dialog.style.left = preDialogLeft;
el_dialog.style.top = preDialogTop;
el_dialog.style.width = preDialogWidth + "px";
el_dialog.style.height = preDialogHeight + "px";
$(this).blur();
$(this).removeClass("dlg_btn_reback_top").addClass("dlg_btn_max_top");
$(".dlg_btn_max_top").unbind("click").bind("click", maxDialog);
}
// 最大化
function maxDialog() {
el_dialog = $("#dialog")[0];
preDialogWidth = el_dialog.offsetWidth;
preDialogHeight = el_dialog.offsetHeight;
preDialogLeft = el_dialog.style.left;
preDialogTop = el_dialog.style.top;
el_dialog.style.left = 0 + "px";
el_dialog.style.top = 0 + "px";
el_dialog.style.width = window.innerWidth - 5 + "px";
el_dialog.style.height = window.innerHeight - 5 + "px";
$(this).blur();
$(this).removeClass("dlg_btn_max_top").addClass("dlg_btn_reback_top");
$(".dlg_btn_reback_top").unbind("click").bind("click", rebackDialog);
}
// 移动
function moveHandler(evt) {
var $trgt = $(event.target);
if (!$trgt.hasClass("dlg_top")) return;
var $this = $(this);
var el = $this[0];
var oevent = evt || event;
var distanceX = oevent.clientX - el.offsetLeft;
var distanceY = oevent.clientY - el.offsetTop;
$(document).bind("mousemove", function (evt) {
var oevent = evt || event;
el.style.left = oevent.clientX - distanceX + 'px';
el.style.top = oevent.clientY - distanceY + 'px';
});
$(document).bind("mouseup", function () {
$(document).unbind("mousemove");
$(document).unbind("mouseup");
});
}
// 显示弹窗
function showDialog() {
$("#dialog").show();
}
// 隐藏弹窗
function hideDialog() {
$("#dialog").hide();
}
// 提交事件
function submitHandler() {
alert("submit success!");
}
// 拖拽缩放：支持右拉 || 下拉 || 右下拉
window.onload = function () {
var el_dlg_right_bottom = document.getElementById("dlg_right_bottom");
var el_dialog = document.getElementById("dialog");
var minHeight = $(el_dialog).attr("minheight");
var minWidth = $(el_dialog).attr("minwidth");
var right = document.getElementById("dlg_right");
var bottom = document.getElementById("dlg_bottom");
var mouseStart = {};
var divStart = {};
var rightStart = {};
var bottomStart = {};
// drag from right
right.onmousedown = function (ev) {
var oEvent = ev || event;
mouseStart.x = oEvent.clientX;
mouseStart.y = oEvent.clientY;
rightStart.x = right.offsetLeft;
if (right.setCapture) {
right.onmousemove = doDragToRightBottomToRight;
right.onmouseup = stopDragToRightBottomToRight;
right.setCapture();
}
else {
document.addEventListener("mousemove", doDragToRightBottomToRight, true);
document.addEventListener("mouseup", stopDragToRightBottomToRight, true);
}
};
function doDragToRightBottomToRight(ev) {
var oEvent = ev || event;
var l = oEvent.clientX - mouseStart.x + rightStart.x;
var w = l + el_dlg_right_bottom.offsetWidth;
if (w < el_dlg_right_bottom.offsetWidth) {
w = el_dlg_right_bottom.offsetWidth;
}
else if (w > document.documentElement.clientWidth - el_dialog.offsetLeft) {
w = document.documentElement.clientWidth - el_dialog.offsetLeft - 2;
}
if (w < minWidth) return;
el_dialog.style.width = w + "px";
};
function stopDragToRightBottomToRight() {
if (right.releaseCapture) {
right.onmousemove = null;
right.onmouseup = null;
right.releaseCapture();
}
else {
document.removeEventListener("mousemove", doDragToRightBottomToRight, true);
document.removeEventListener("mouseup", stopDragToRightBottomToRight, true);
}
};
// drag from bottom
bottom.onmousedown = function (ev) {
var oEvent = ev || event;
mouseStart.x = oEvent.clientX;
mouseStart.y = oEvent.clientY;
bottomStart.y = bottom.offsetTop;
if (bottom.setCapture) {
bottom.onmousemove = doDragToRightBottomToBottom;
bottom.onmouseup = stopDragToRightBottomToBottom;
bottom.setCapture();
}
else {
document.addEventListener("mousemove", doDragToRightBottomToBottom, true);
document.addEventListener("mouseup", stopDragToRightBottomToBottom, true);
}
};
function doDragToRightBottomToBottom(ev) {
var oEvent = ev || event;
var t = oEvent.clientY - mouseStart.y + bottomStart.y;
var h = t + el_dlg_right_bottom.offsetHeight;
if (h < el_dlg_right_bottom.offsetHeight) {
h = el_dlg_right_bottom.offsetHeight;
}
else if (h > document.documentElement.clientHeight - el_dialog.offsetTop) {
h = document.documentElement.clientHeight - el_dialog.offsetTop - 2;
}
if (h < minHeight) return;
el_dialog.style.height = h + "px";
};
function stopDragToRightBottomToBottom() {
if (bottom.releaseCapture) {
bottom.onmousemove = null;
bottom.onmouseup = null;
bottom.releaseCapture();
}
else {
document.removeEventListener("mousemove", doDragToRightBottomToBottom, true);
document.removeEventListener("mouseup", stopDragToRightBottomToBottom, true);
}
};
// drag from right bottom
el_dlg_right_bottom.onmousedown = function (ev) {
var oEvent = ev || event;
mouseStart.x = oEvent.clientX;
mouseStart.y = oEvent.clientY;
divStart.x = el_dlg_right_bottom.offsetLeft;
divStart.y = el_dlg_right_bottom.offsetTop;
if (el_dlg_right_bottom.setCapture) {
el_dlg_right_bottom.onmousemove = doDragToRightBottom;
el_dlg_right_bottom.onmouseup = stopDragToRightBottom;
el_dlg_right_bottom.setCapture();
}
else {
document.addEventListener("mousemove", doDragToRightBottom, true);
document.addEventListener("mouseup", stopDragToRightBottom, true);
}
};
function doDragToRightBottom(ev) {
var oEvent = ev || event;
var l = oEvent.clientX - mouseStart.x + divStart.x;
var t = oEvent.clientY - mouseStart.y + divStart.y;
var w = l + el_dlg_right_bottom.offsetWidth;
var h = t + el_dlg_right_bottom.offsetHeight;
if (w < el_dlg_right_bottom.offsetWidth) {
w = el_dlg_right_bottom.offsetWidth;
}
else if (w > document.documentElement.clientWidth - el_dialog.offsetLeft) {
w = document.documentElement.clientWidth - el_dialog.offsetLeft - 2;
}
if (h < el_dlg_right_bottom.offsetHeight) {
h = el_dlg_right_bottom.offsetHeight;
}
else if (h > document.documentElement.clientHeight - el_dialog.offsetTop) {
h = document.documentElement.clientHeight - el_dialog.offsetTop - 2;
}
if (w < minWidth) return;
el_dialog.style.width = w + "px";
if (h < minHeight) return;
el_dialog.style.height = h + "px";
};
function stopDragToRightBottom() {
if (el_dlg_right_bottom.releaseCapture) {
el_dlg_right_bottom.onmousemove = null;
el_dlg_right_bottom.onmouseup = null;
el_dlg_right_bottom.releaseCapture();
}
else {
document.removeEventListener("mousemove", doDragToRightBottom, true);
document.removeEventListener("mouseup", stopDragToRightBottom, true);
}
};
};
五、结语
希望对您有用，愿您吉祥如意！
At 2018.04.26
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