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This article describes an ASP.NET popup control. This control imitates MSN Messenger alert, but it is designed for use in a web page. Graphical appearance of this control can be completely changed by using one of predefined styles or by modifying all colors used on the control. Control supports Drag&Drop, so user can move control on the page, where he wants.
A very important feature of this control is, that it can be used on most of the current browsers. It is tested with latest version of Mozilla, Internet Explorer and Opera. The look of the control is different on browsers that doesn't support filters (filters are supported only in newer versions of MSIE). You can also use HTML in lot of control properties, so you can get popup with icon or anything you want.
The control has two events,
LinkClicked (link in popup was clicked) and
PopupClosed (user clicked on 'X' button in popup). There are three ways how this events can be handled. The method that will be used is determined by
ActionType property. There can be the following three types of actions:
MessageWindow(default) - If this action is selected, control will open new browser window with text specified by
Linkproperty). You can also change
targetattribute of generated
<A>tag. Generated code will look like this:
<a href="[Link]" target="[LinkTarget]">Link..</a>, so be careful when using quotes in
Targetattribute is added only when
LinkTargetisn't empty string.)
RaiseEvents- When you select this option, popup control will raise
PopupClosedevents on server-side.
Using this control
Adding the control to a web page is very simple. In VS.NET, you can just use Add/Remove Toolbox Items and select control's DLL file. Control will appear in toolbox and you can add it to a page.
Control has rich support for designer, so you can change every property of control at design-time. In category 'Action', you can define what the control should do when user clicks on link or closes popup element. Properties in categories 'Texts' and 'Design' allow you to modify control look and displayed messages. In 'Behavior', you can change timing (when popup will be displayed and hidden).
AutoShow property indicates whether control will be displayed after page is loaded. This is useful when you want to show control later using Anchor control. If you set
true, user can change control's position and move it on the page. 'Window' category allows you to change properties of window that will appear if you set
MessageWindow. Last properties are added to category 'Layout' and it makes possible to modify position, where window will be displayed (offsets from bottom-left or bottom-right window corner).
Following code describes how to change a few properties and show popup control from code:
<!-- Popup.aspx --> <%@ Register TagPrefix="cc1" Namespace="EeekSoft.Web" Assembly="EeekSoft.Web.PopupWin" %> <cc1:popupwin id="popupWin" runat="server" visible="False" colorstyle="Blue" width="230px" height="100px" dockmode="BottomLeft" windowscroll="False" windowsize="300, 200"></cc1:popupwin> // Popup.aspx.cs // Change action type popupWin.ActionType=EeekSoft.Web.PopupAction.MessageWindow; // Set popup and window texts popupWin.Title="This is popup"; popupWin.Message="<i>Message</i> displayed in popup"; popupWin.Text="Text to show in new window.."; // Change color style popupWin.ColorStyle=EeekSoft.Web.PopupColorStyle.Green; // Change timing popupWin.HideAfter=5000; popupWin.ShowAfter=500; // Show popup (after page is loaded) popupWin.Visible=true;
Using anchor control
Adding anchor control to page at design-time is similar as adding popup control. When you add anchor to page, you can select ID of existing server-side control, or write ID of any other element, and choose its client-side event you want to handle. If you want to only reopen popup, you don't need to do anything else. You only have to ensure that popup window control will be rendered to output page (it must be visible). If you don't want to open popup when page is loaded, set
false and popup will open after specified event occurs.
You can also change texts on popup control using
PopupWinAnchor. To do this, set property
ChangeTexts of anchor control to
true. If this is selected, anchor control will change title of popup to
NewTitle, message to
NewMessage and text in optional new browser window to
NewText, when client-side event is raised.
Following example shows how
PopupWinAnchor control can be used to reopen once closed popup control:
<!-- Anchor.aspx --> <%@ Register TagPrefix="cc1" Namespace="EeekSoft.Web" Assembly="EeekSoft.Web.PopupWin" %> <cc1:popupwin id="popupWin" runat="server" visible="False" colorstyle="Blue" width="230px" height="100px" dockmode="BottomLeft" windowscroll="False" windowsize="300, 200"></cc1:popupwin> <cc1:popupwinanchor id="popupAnchor" runat="server" changetexts="False"></cc1:popupwinanchor> <span id="spanReopen"> Click here to reopen popup ! </span> // Anchor.aspx.cs // Handle onclick event .. popupAnchor.HandledEvent="onclick"; // .. of spanReopen element popupAnchor.LinkedControl="spanReopen"; // Show popupWin when event occurs popupAnchor.PopupToShow="popupWin"; // Popup win is visible .. popupWin.Visible=true; // .. and will be displayed when page is loaded popupWin.AutoShow=true;
Creating control at runtime
There were problems with creating controls at runtime. This is fixed in latest version and here is an example of how to create
spanReopen element. (This sample assumes, that you have an element called
spanReopen on your page).
// Create popup window and popup win anchor control (in Page_Load) PopupWin popupWin=new PopupWin(); PopupWinAnchor popupAnchor=new PopupWinAnchor(); // Add controls to page placeHolder.Controls.Add(popupAnchor); placeHolder.Controls.Add(popupWin); // Set anchor properties popupAnchor.PopupToShow=popupWin.ClientID; popupAnchor.LinkedControl="spanReopen"; popupAnchor.HandledEvent="onclick"; // Set popup win properties popupWin.ActionType=EeekSoft.Web.PopupAction.MessageWindow; popupWin.Title="This is popup"; popupWin.Message="Message displayed in popup"; // Show popup popupWin.Visible=true; popupWin.AutoShow=false;
Who can use it ?
This control can be well used to notify users about important information. For example, in a web email client, you may want to notify the user about new message. In applications where users can communicate inside system, you can use this control to alert user, that someone wants to talk to him. Benefit of this control is, that it doesn't need any fixed space on web page and it is remarkable, so user will notice it. Another way of how to use it is to show advertising information in it instead of using big Flash animations (See online demo for CodeProject banner).
Anchor control makes it possible to use popup control faster and with less page reloading. For example, you can use popup control to show quick help on form fields like in this sample. Quick help is displayed when textbox receives focus. Another way of how to use it for quick help is to add button behind each textbox and when user clicks on this button, popup will be displayed.
- 20/04/2004 -
PopupSpeedadded (you can change sliding speed of popup window).
- 20/04/2004 - Few minor bugs fixed. Sample that shows how to generate controls at runtime added.
- 26/02/2004 -
ShowLinkproperty added (allows not to generate link in popup control).
- 11/30/2003 - DLL compiled both .NET 1.0 and .NET 1.1,
OpenLinkerror fixed, Drag & drop support, VB.NET sample added (1.2).
- 11/18/2003 -
PopupWinAnchoradded (1.1). Thanks to Oskar Austegard for his suggestion.
- 11/15/2003 - First version (1.0)