一些常用弹出窗口/拖放/异步文件上传等实用代码

久不出技术类文章，我都忘了自己是一程序员啦......今天写一点工作中遇到的东西，大家共同学习，反正也比较浅显了。

弹出窗口

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我们在工作中，经常会碰到弹出窗口类应用，有时候还需要一点遮盖层：

 

这类圆角弹出框其实用得还是很广泛的，用CSS3可以很容易的出现，但是考虑到浏览器兼容问题，这类还是需要用图片实现了

主要代码如下：

//弹出层剧中 
function popup(popupName) { 
var _scrollHeight = $(document).scrollTop(); //获取当前窗口距离页面顶部高度 
_windowHeight = $(window).height(); //获取当前窗口高度 
_windowWidth = $(window).width(); //获取当前窗口宽度 
_popupHeight = popupName.height(); //获取弹出层高度 
_popupWeight = popupName.width(); //获取弹出层宽度 
// _posiTop = (_windowHeight - _popupHeight) / 2 + _scrollHeight - 50; 
_posiTop = _scrollHeight + 120; 
_posiLeft = (_windowWidth - _popupWeight) / 2; 
popupName.css({ "left": _posiLeft + "px", "top": _posiTop + "px", "display": "block" }); //设置position 
} 
function dragFunc(dragDiv, dragBody) { 
if (dragDiv[0] && dragBody[0]) { 
var dragAble = false; 
var x1 = 0; 
var y1 = 0; 
var l = 0; 
var t = 0; 
var divOffset = dragBody.offset(); 
dragDiv.mousedown(function (e) { 
var ss = this; 
// var rootId = 
dragDiv.css("cursor", "move"); 
dragAble = true; 
// 当前鼠标距离div边框的距离 
// 当前鼠标坐标，减去div相对左边的像素 
l = parseInt(dragBody.css("left")); 
t = parseInt(dragBody.css("top")); 
x1 = e.clientX - l; 
y1 = e.clientY - t; 
x1 = x1 > 0 ? x1 : 0; 
y1 = y1 > 0 ? y1 : 0; 
this.setCapture && this.setCapture(); 
}); 
dragDiv.mousemove(function (e) { 
if (!dragAble) 
return; 
// 当前div左边的坐标 
// 当前鼠标坐标，减去鼠标拖动量 
var x2 = 0; 
var y2 = 0; 
//需要考虑滚动条问题！！！ 
var top = $(document).scrollTop() ? $(document).scrollTop() - 15 : 0; 
var left = $(document).scrollLeft() ? $(document).scrollLeft() - 15 : 0; 
x2 = e.clientX - x1 + left; 
y2 = e.clientY - y1 + top; 
x2 = x2 > 0 ? x2 : 0; 
y2 = y2 > 0 ? y2 : 0; 
//要移动一定数量才移动 
if (Math.abs(l - x2) > 10 || Math.abs(t - y2) > 10) { 
dragBody.css("left", x2 + "px"); 
dragBody.css("top", y2 + "px"); 
} 
}); 
dragDiv.mouseup(function (event) { 
if (!dragAble) 
return; 
dragAble = false; 
// dragDiv.css("position", "relative"); 
this.releaseCapture && this.releaseCapture(); 
}); 
} 
} 
var MyDialog = function (cfg) { 
this.config = { 
id: (new Date()).getTime().toString(), 
el: null, 
bodyId: null, 
cover: true, 
boxHtm: '<div class="dialog" > ' + 
'<table> ' + 
' <tr class="top"> ' + 
' <td class="tl"> ' + 
' </td> ' + 
' <td class="c"> ' + 
' </td> ' + 
' <td class="tr"> ' + 
' </td> ' + 
' </tr> ' + 
' <tr> ' + 
' <td class="c"> ' + 
' <div style="width:10px;"></div>' + 
' </td> ' + 
' <td class="main"> ' + 
' <div class="title"> ' + 
' <h3> ' + 
' <span class="title_text">请输入标题</span> <a class="cls" href="javascript:;"></a> ' + 
' </h3> ' + 
' </div> ' + 
' <div class="content"> ' + 
' 请输入内容 ' + 
' </div> ' + 
' </td> ' + 
' <td class="c"> ' + 
' </td> ' + 
' </tr> ' + 
' <tr class="bottom"> ' + 
' <td class="bl"> ' + 
' </td> ' + 
' <td class="c"> ' + 
' <div style="width:10px;"></div>' + 
' </td> ' + 
' <td class="br"> ' + 
' </td> ' + 
' </tr> ' + 
'</table> ' + 
'</div>' 
}; 
var scope = this; 
if (cfg) { 
$.each(cfg, function (key, value) { 
scope.config[key] = value; 
}); 
} 
this.box = null; 
this.cover = null; 
this.tmpBody = null; 
} 
MyDialog.prototype.show = function () { 
var scope = this; 
var cover = null; 
var box = null; 
if (this.config.cover) { 
if (this.config.id && $('#' + this.config.id + '_cover')[0]) { 
cover = $('#' + this.config.id + '_cover'); 
cover.show(); 
} else { 
cover = $('<div style=" display:block; " id="' + this.config.id + '_cover" class="coverDiv" ></div>'); 
$('body').append(cover); 
} 
scope.cover = cover; 
} 
if (!$('#' + this.config.id)[0]) { 
box = $(this.config.boxHtm); 
$('body').append(box); 
box.attr('id', this.config.id); 
if (this.config.title) { 
box.find('.title_text').html(this.config.title); 
} 
if (this.config.bodyId) { 
var body = $('#' + this.config.bodyId); 
var tmp = $('<div></div>').append(body); 
var initBody = tmp.html(); 
scope.tmpBody = $(initBody); 
tmp = null; 
if (body[0]) { 
var con = box.find('.main .content'); 
body.show(); 
con.html(''); 
con.append(body); 
} 
} 
if (this.config.el && this.config.el[0]) { 
var con = box.find('.main .content'); 
con.html(this.config.el); 
} 
//居中 
popup(box); 
//关闭dialog 
box.find('.title .cls').click(function (e) { 
scope.close(); 
e.preventDefault(); 
return false; 
}); 
dragFunc($('#' + this.config.id + ' .main .title'), $('#' + this.config.id)); 
box.show(); 
this.box = box; 
} 
} 
MyDialog.prototype.close = function () { 
//这里有问题 
var box = this.box; 
var tmpBody = this.tmpBody; 
var cover = this.cover; 
if (tmpBody && tmpBody[0]) { 
$('body').append(tmpBody); 
} 
if (box && box[0]) { 
box.remove(); 
} 
if (cover && cover[0]) { 
cover.hide(); 
} 
};

调用方法：

var dia = new MyDialog({ 
title : title, 
bodyId : id, 
id : id + '_box' 
}); 
dia.show();

具体可能还需要一定函数回调，各位可以自己封装一番。拖放

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工作中也经常会出现拖放效果的一些需求：

代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<title></title> 
<script src="http://www.cnblogs.com/scripts/jquery-1.7.1.js" type="text/javascript"></script> 
<script type="text/javascript"> 
function dragFunc(dragDiv, dragBody, dropBody) { 
if (!dropBody[0]) { 
dropBody = $(document); 
} 
if (dragDiv[0] && dragBody[0]) { 
var dragAble = false; 
var x1 = 0; 
var y1 = 0; 
var l = 10; 
var t = 10; 
var init_position = ''; 
var init_cursor = ''; 
var tmp_body = null; 
dragDiv.mousedown(function (e) { 
var ss = this; 
init_position = dragBody.css("position"); 
init_cursor = dragBody.css("init_cursor"); 
dragBody.css("position", "absolute"); 
dragDiv.css("cursor", "move"); 
tmp_body = $('<div class="tmp_div"></div>'); 
tmp_body.css('width', dragBody.css('width')); 
tmp_body.css('height', dragBody.css('height')); 
tmp_body.insertAfter(dragBody); 
$(document).bind("selectstart", function () { return false; }); 
dragAble = true; 
// 当前鼠标距离div边框的距离 
// 当前鼠标坐标，减去div相对左边的像素 
l = parseInt(dragBody.css("left")) ? parseInt(dragBody.css("left")) : 10; 
t = parseInt(dragBody.css("top")) ? parseInt(dragBody.css("top")) : 10; 
var offset = dragBody.offset(); 
l = parseInt(offset.left); 
t = parseInt(offset.top); 
x1 = e.clientX - l; 
y1 = e.clientY - t; 
x1 = x1 > 0 ? x1 : 0; 
y1 = y1 > 0 ? y1 : 0; 
this.setCapture && this.setCapture(); 
}); 
dragDiv.mousemove(function (e) { 
if (!dragAble) 
return; 
// 当前div左边的坐标 
// 当前鼠标坐标，减去鼠标拖动量 
var x2 = 0; 
var y2 = 0; 
//需要考虑滚动条问题！！！ 
var top = $(document).scrollTop() ? $(document).scrollTop() - 15 : 0; 
var left = $(document).scrollLeft() ? $(document).scrollLeft() - 15 : 0; 
x2 = e.clientX - x1 + left; 
y2 = e.clientY - y1 + top; 
x2 = x2 > 0 ? x2 : 0; 
y2 = y2 > 0 ? y2 : 0; 
//要移动一定数量才移动 
if (Math.abs(l - x2) > 10 || Math.abs(t - y2) > 10) { 
dragBody.css("left", x2 + "px"); 
dragBody.css("top", y2 + "px"); 
} 
//红 #993300 
//灰 #DBEAF9 
//移动结束后判断拖放 
var w = parseInt(dragBody.css('width')); 
var h = parseInt(dragBody.css('height')); 
$.each(dropBody, function () { 
var el = $(this); 
el.css('background-color', 'Gray'); 
var offset = el.offset(); 
var _l = offset.left || 0; 
var _t = offset.top || 0; 
var _w = parseInt(el.css('width')); 
var _h = parseInt(el.css('height')); 
if (x2 > _l && x2 + w < _l + _w && y2 > _t && y2 + h < _t + _h) { 
el.css('background-color', '#DBEAF9'); 
el.append(tmp_body); 
} 
var s = ''; 
}); 
}); 
dragDiv.mouseup(function (event) { 
if (!dragAble) 
return; 
$(document).unbind("selectstart"); 
//还原position 与 cursor 
dragBody.css("position", init_position); 
dragBody.css("cursor", init_cursor); 
//dragBody.css("left", '0'); 
//dragBody.css("top", '0'); 
if (tmp_body) { 
dragBody.insertAfter(tmp_body); 
var offset = tmp_body.offset(); 
l = parseInt(offset.left); 
t = parseInt(offset.top); 
dragBody.css("left", l); 
dragBody.css("top", t); 
tmp_body.remove(); 
} 
dragAble = false; 
// dragDiv.css("position", "relative"); 
this.releaseCapture && this.releaseCapture(); 
}); 
} 
} 
$(document).ready(function () { 
var d1 = $('#d1'); 
var c = $('.c'); 
dragFunc(d1, d1, c); 
}); 
</script> 
<style type="text/css"> 
div 
{ 
width: 100px; 
height: 100px; 
border: 1px solid black; 
} 
.tmp_div 
{ 
border-style: dashed; 
} 
#c1 
{ 
background-color: Gray; 
width: 300px; 
height:300px; 
float:left; 
margin:20px; 
} 
#c2 
{ 
background-color: Gray; 
width: 300px; 
height:300px; 
float:left; 
margin:20px; 
} 
</style> 
</head> 
<body> 
<div id="c1" class="c">1 
<div id="d1">me 
</div> 
</div> 
<div id="c2" class="c">2 
</div> 
</body> 
</html>

异步文件上传

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我们所谓的AJAX异步文件上传事实上用js技术好像暂时还不能实现，就我所谓的异步上传事实上还是表单提交，而将form的target指向一

隐藏的iframe，然后成功后回调即可，真是十分坑爹的做法。。。。。

若是要更好的体验，便需要借助flash或者XX框架了，但是我也没有研究过.

<form id="formImg" name="formImg" enctype="multipart/form-data" method="post" action=""> 
<input type="hidden" name="MAX_FILE_SIZE" value="800000" id="max_size"/> 
<input type="hidden" name="callback" value="parent.add_img_input" id="callback"/> 
<a class="upbtn"><input type="file" name="userfile" id="userfile" title="支持JPG、GIF、PNG格式，文件小于1M" 
name="pic" value="" onchange="javascript:up_img(17);">上传</a> 
</form> 
document.charset='utf-8'; 
var form = $('#formImg'); 
var frame = $('#frame_img'); 
if (!frame[0]) { 
frame = $('<iframe id="frame_img" name="frame_img" style="display:none;" ></iframe>'); 
} 
form.append(frame); 
form.attr('target', 'frame_img'); 
form.attr('action', url); 
form.submit(); document.charset='gbk';

但是回调会涉及一点跨域的问题，需要在同一大域名下才行。

现况

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爱生活，爱工作，今年继续努力吧！