Daily Archives: April 29, 2008

Master-Detail with the GridView, DetailsView and ModalPopup ControlsMatt Berseth

A while back I wrote a post describing how the DetailsView, GridView, UpdatePanel and the AjaxControlToolkit’s ModalPopup controls could be used to implement the common Master/Details UI pattern.  I cheated a bit when creating my original example in that I didn't really complete the implementation – the Save button on the popup didn't actually do anything.  Since writing that post I have received a lot of email and a number of people left comments asking me to complete the example – so here it is.  If you plan on reading through this article, I recommend playing around with the demo site to get a feel for how the page works.  All data changes are only persisted to memory, so don't worry about messing up the data set.

Live Demo | Download

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Scenario

I am sure everyone is pretty familiar with Master/Details style of editing data, but just in case – here is how my page works.  The grid shows 12 rows of customer data.  The far right column in the grid contains a hyperlink that when clicked brings the detail view of the row into focus so the corresponding row can be edited.  The detail view is a popup control and contains a Save and Close buttons.  When close is clicked, the detail popup is dismissed and the user goes back to viewing the main grid.  When they click Save, some simple validation checks are run (all are RequiredFieldValidators for this sample) and the new data values are persisted, and finally the detail popup is dismissed and the main grid is refreshed so that it displays the changes.

Controls

There are quite a few controls that work together for this sample.  Here is a listing of the controls and the role they play.

Control Role
GridView Display the 12 customer rows of data
DetailsView Display the single customer row that is currently being edited
ModalPopupExtender Display the DetailView modally
UpdatePanel Allow the DetailView to be loaded without refreshing the entire page
ObjectDataSource Manage how our UI interacts with the customer data

Customer GridView

The Customer Grid is just a regular GridView.  I have used BoundFields to bind to the data and I am using a TemplateField for rendering the 'Edit' anchor. 

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When 'Edit' is clicked, I want to show the detail view popup.  To accomplish this I set the CommandName of the 'Edit' button to Select – this will cause the SelectedIndexChanged event to fire on the server.  Inside this event handler, I force the DetailView to databind, passing the datasource it is bound to the ID that corresponds to the row the user clicked.  Finally, I let the UpdatePanel the DetailView is contained in that it needs to update its contents and invoke the Show server side method of my ModalPopupExtender which will cause the popup to be displayed when the partial page is reloaded on the client.

Here are the 2 events handlers that I am using to accomplish this bit of work.  The top event handler fires when 'Edit' is clicked and the explicit call to DataBind forces the DetailView's corresponding ObjectDataSource's Selecting event to fire.  In this handler I use the SelectedIndex of the GridView to fetch the ID the data source needs. 

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Customer DetailsView

The DetailsView for the individual customer records is also pretty simple – except because I have included RequiredFieldValidators I wasn’t able to use the BoundFields and instead I had to explicitly define the EditItemTemplate for each of the fields.

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Just below the DetailsView, I have 2 buttons that interact with the ModalPopupExtender.  The Close button dismissed the popup without posting back or committing any changes.  The Save button does post back, moves the data out of the DetailsView and back to the ObjectDataSource, hides the ModalPopupExtender and finally causes the main GridView to refresh so it displays the changes.

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Here is the logic I have wired to the Save button’s click handler.

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Apply a Yellow Fade to the Updated Row in the GridView

And while this has been pretty much nuts and bolds functionality thus far, I couldn't resist trying to spice it up by applying a yellow fade to the row in the main grid that was updated.  To implement this feature, I needed a way to send a bit of information back from the server that let me know what row in the grid was updated.  So my approach was to use the ScriptManager’s RegisterDataItem method to accomplish this.  Here is the doc from MSDN:

Sends custom data to a control during partial-page rendering, and indicates whether the data is in JavaScript Object Notation (JSON) format.

Just what I need – so after the Save button is clicked, back in the server side event handler, I call RegisterDataItem and pass the index of the updated row to the GridView.  Then after the partial refresh has occurred back on the client, I extract the row index from the DataItem's collection, use it to find the row that changed and give it a custom CSS class.

So I added the following call to my Save button handler to register the index of the row that was changed.

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And then added the following JavaScript to my page to track down the corresponding TR element in the rendered table and apply the updated CSS class to the row.

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And like magic I get a yellow background applied to the row that was edited.  The background color stays in place for 1.5 seconds then my timeout handler fires and removes it.  A poor man's animation, but the plumbing is in place for me to improve upon.  Below are the screen shots of how it looks.

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That's it.  Enjoy!

Highslide JS .NET Updated (v0.7)Encosia

An update to Highslide JS .NET is available today. I recommend that everyone upgrade, to benefit from the memory leak fixes in the latest Highslide JS.

v0.7 (4/29/2008)

  • Updated embedded Highslide version to 3.3.17.
  • Improved caption rendering, using inline caption divs. This should result in more semantic markup, pairing your captions with your images.
  • Added HighslideManager property: NumberOfImagesToPreload. This allows you to control how many images are automatically preloaded.
  • Added HighslideManager property: FadeInOut. When true, this fades the enlargement in and out as it’s resizing.
  • Added HighslideManager property: RenderScriptInPlace. This allows you to control where on the page the Highslide JS script is inserted in your page.
  • Updated download to include a sample site, to make it a little easier to get up and running quickly.

As always, the latest version is available on the Highslide JS .NET project page.

Originally posted at: Encosia.

NTFS-3G Makes NTFS Partitions Writable [Featured Download]Lifehacker

Mac OS X and Linux: Now that you’re dual booting Windows on your Mac, you want to save files to your Windows partition while you’re booted up in OS X. By default, NTFS-formatted disks are read-only in OS X, but the NTFS-3G driver makes it writable. Download NTFS-3G, then use the following command to save and edit files on your Boot Camp partition:

sudo mount -t ntfs-3g /dev/disk0s3 /Volumes/Untitled

You can also use the previously mentioned MacFUSE to write to NTFS disks, but while mounting disks over SSH went without a hitch with MacFUSE for me, I had trouble with NTFS disks (though NTFS-3G worked perfectly). The NTFS-3G driver is a free download for Mac and Linux.




CCleaner 2.0 Decrapifies Your PC [Featured Windows Download]Lifehacker

ccleanerthumb.png Windows only: One of our favorite PC cleansers CCleaner (which stands for "Crap Cleaner") saw an upgrade this week. Since the last time we mentioned CCleaner several new versions have come out; this week's added support for the Firefox 3 beta plus performance improvements and bug fixes. CCleaner scans your PC for unnecessary temporary and log files, cookies, memory dumps, and more and wipes them out at the press of the "Run Cleaner" button. You might be surprised at how much disk space it can recover—in fact, it managed to clear out 1.6GB of crap from my PC. See screenshot evidence after the jump.


CCleaner also includes a registry scanner, startup manager, and Add/Remove Programs area to uninstall applications you don’t use anymore. CCleaner 2.0 is a free download for Windows only.




K7 Offers Free Fax/Voicemail Lines [Web Utilities]Lifehacker

k7_cropped.jpgNeed a phone line to receive a one-time fax or voicemails on a particular project, auction, or job search? Free service K7 hands out 10-digit Seattle-area phone numbers that can answer calls with customized voicemail greetings or accept faxes. You can access both the audio files and fax documents through your sign-up account, and the only restrictions are a 20-message/fax limit (the site starts deleting the oldest after that) and an account wipe out after 30 days of inactivity. Other than that, you’ve got a free bin to keep your personal numbers private and still get at your messages.




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