In this article, I will share how to cause the same effect as the
ModalPopUpExtender from the AJAX Control Toolkit in ASP.NET using CSS and AJAX. We'll be able to create Master/Details, LookUps, Error Messages, or whatever other use you want to give it! There are a lot of approaches out there, so probably nothing new... Just my way of doing it
Well, if there's a
ModalPopUpExtender in the AJAX Control Toolkit, why not use it and do something different? My scenario was such a pain for that. Let me explain:
I have Master Pages, Web Pages, Content Holders, and User Controls. User Controls are loaded dynamically when used as "popups". I started to search on how to convert them into "popup windows" and found two different ways that thought would work.
The first try:
ModalPopUpExtender. I prepared everything: CSS background class,
PopUpPanel... so I decided to use the second option.
The second try: Well, the second try was using simple HTML and CSS. I found an example where with two
Divs and CSS, it could be achieved. It looked familiar for me because that's the way sometimes I show an
ContentHolders in a WebPage inside a MasterPage), I faced an error from the server trying to parse the request. So, as I was not able to change that structure to avoid the error, I thought using AJAX would probably work with some changes, and that's what I did.
The code and the solution
Let's add an
UpdatePanel, at the end of our HTML (of course, inside the
content tag). Now, in the
ContentTemplate, we'll just add two panels, one for the overlay and one for the popup.
The second panel (
panelPopUpPanel in the example below) has a nested panel, which I use to create the "Title" bar. In the sample below, it just contains the "Close" button. After this nested panel (still inside the
PopUpPanel), add whatever you want to display there (in the sample below, it contains a User Control called
<asp:updatepanel id="upPopUps" runat="server" updatemode="Always">
<asp:panel id="panelOverlay" runat="server"
<asp:panel id="panelPopUpPanel" runat="server"
<asp:panel id="panelPopUpTitle" runat="server"
style="width: 100%; height: 20px; text-align: right; ">
Notice that both panels (overlay and popup) have the
Class attribute set. Here is the CSS to give the
OverlayPanel an overlay effect and to give the
PopUpPanel the position and size and border and whatever you want to specify for it. Play with it to change the appearance in a way you like it.
-moz-box-shadow:3.5px 4px 5px #000000;
-webkit-box-shadow:3.5px 4px 5px #000000;
box-shadow:3.5px 4px 5px #000000;
border: 1px solid #CCCCCC;
Notice the overlay position. It is set to "fixed". Why? If you have a large page that needs scrolling, with "fixed", you will overlay all the page even if scrolling.
So, how do we show the pop up? Have you noticed that the panels have their
Visible attribute set to
false? Just change that attribute to show them or hide them, like this:
Private Sub showPopUp(b As Boolean)
panelOverlay.Visible = b
panelPopUpPanel.Visible = b
That was just a function that receives a boolean parameter (true or false) and sets the
Visible attribute of the panels to the value of the parameter received.
And that's it. Easy, huh? Here is how it looks:
As said, this can be used in many different scenarios: Update Progress, Quick Searches, Master Detail pages, etc. Please feel free to try and change it. If you improve it, please share it. If you want to download the sample code, it is available at the top of this article. You can also read the original article in my blog. Hope it helps!
Thanks for reading!