[CodeProject每日一荐] ASP.NET 仿MSN Messenger Alert的弹出窗口控件
Posted on 2011-06-09 09:53 itcfj 阅读(310) 评论(0) 编辑 收藏 举报发现自己象樱桃小丸子一样,买个闹钟,用第二次就不起作用了.刚说了每天推荐一个
CodeProject,就因为网络,瞎忙等原因耽搁了.惭愧,尽力补上吧.CodeProject上做仿MSN Messenger
Alert的弹出窗口控件的不是一个两个,有的是windows app有的是web app.我会一一做个比较,首先介绍这个:ASP.NET Popup Control By Tomas Petricek
[在线demo]
http://www.eeeksoft.net/files/popuptest/
[介绍]
ASP.NET
弹出窗口控件, 是MSN Messenger
提醒(alert)的网页版,通过定义颜色风格可以修改图形的外观.支持拖放操作.一个很重要的特性是支持绝大多数浏览器.在最新版本的Mozilla,
IE和Opera下测试通过,在不支持filter的浏览器中UI会有些差异.控件的很多属性可直接使用HTML代码,以实现图片等丰富的表现形式.
ASP.NET 弹出窗口控件PopupWindow, 可用于通知用户重要的信息,比如在web email客户端通知用户新消息/信件. 当用户在系统内交流时需要通知他有人找他聊天. 用此控件的好处是不占网页的空间又能醒目得引起用户的注意. 另外可用于显示广告信息.
锚定弹出控件PopupWinAnchor,可以让弹出窗口控件更快,页面加载更少.比如我们可以用以实现表单填写的即时帮助.当textbox收 到输入焦点时即显示动态帮助. 另外,可以用来在每个textbox后加一个button, 当用户点击button时显示弹出窗口.(译者加:即可把该控件与其它某控件关联起来,指定在某控件发生某客户端事件时触发弹出窗口控件)
[效果]
控件有两个事件: 点击弹出窗口上链接时的事件LinkClicked, 点击右上角关闭按钮时的PopupClosed. 根据ActionType属性(如下)的不同,有三种处理事件的方式:
(1)MessageWindow (默认) - 控件会打开新的浏览器窗口,其中显示Text属性的内容.
(2)OpenLink
- 控件可以执行JavaScript操作或打开Link属性中的新页面. 生成的<A>标签的target属性也是可以改变的.
生成的代码是这个样子的: <a href="[Link]"
target="[LinkTarget]">Link..</a>, 因此得当心Link属性中不要使用引号.
LinkTarget非空时才会加上Target属性.
(3)RaiseEvents - 控件触发服务器端的 LinkClicked 或 PopupClosed 事件
[弹出窗口控件PopupWindow使用]
在页面中使用此控件非常简单. VS.NET中,只需要在工具箱中用"添加删除项"来选中控件的dll文件,然后从工具箱中把该控件拖放页面中.
设计器:
控件有良好的设计时支持,我们可以更改所有属性,Action类别中,我们可以定义当用户点击链接和关闭窗口时控件的行
为,Text和Design类别中,我们可以修改控件的外表和显示的消息.在Behavior中,我们可以改变时间间隔(何时显示/隐藏弹出窗
口),AutoShow属性指控件是否在页面加载后即显示,DragDrop属性为真时,用户可以在页面中拖放控件的位置.
如果我们把ActionType 设为 MessageWindow,Window类别可以用来改变显示窗口的属性.
Layout类别中的属性可以用来控制位置(从窗口左下角或右下角的位移).
代码
下面的代码显示了如何改变一些属性并显示控件.
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[锚定弹出控件PopupWinAnchor使用]
设计器:
与
加入一个弹出窗口控件类似,设计时我们可以把锚定控件加入到页面中,从选择一个已经存在的服务器端控件或填入其他元素的ID到LinkedControl
属性, 然后选择想绑定的客户端事件HandledEvent. 如果只是想再打开弹出窗口,不需劳神,只要让弹出控件在弹出窗口中可见即可.
如果不想在页面加载时就显示弹出控件,
得把AutoShow置为false,这样只有在发生绑定的特定事件时才会显示.要改变文字锚定弹出控件的文字,需把属性ChangeTexts设为
true.
代码:
下面的代码显示了如何锚定弹出控件来打开曾关闭的弹出控件
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[运行时创建控件]
以前的版本在运行时动态创建此控件有
bug,最新版本已经修正了,下面是运行时创建PopupWindow和PopupWinAnchor控件的示例.
当用户点击spanReopen元素后,用JavaScript会创建并显示一个弹出窗口.(这个示例假定页面上有个spanReopen的元素)
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