I have created a databinding treeview which binds with multiple tables and display hierarchical data. I stole much of the mechanism from http://www.codeproject.com/KB/tree/dbTree.aspx if it interests you.
I first merge(outer join) all the datatables into a big datatable, then databind the treeview and bunch of textboxes to the big table. User can click on a node in the treeview and see corresponding info in the textboxes. So viewing part is nice.
Now coming to updating, deleting, adding info via textboxes entries, is there a way the user can make changes via the textboxes, and immediately reflected in the big table and individual tables ?
Thanks!!
You are joining information in a kind of view and I understand that this view is stored in memory while you fill your tree. So, if you do any kind of change in the data inside the tables that composes your view, you must reload it.
If you are working with an web app, it is going to be something natural, because each user interaction will do a new request to create you view.
Related
I'm trying to figure out what design object to use for my forms application.
I want to make a forms application that looks like below image.
I have so far used splitcontainers for the layout and three gridviews with separate DataSources querying the same table but with different where clause for eatch gridview. This works fine but when i click a row in any of the three gridviews i cant have that data show on the right side becaus i can only get data from one datasource on my labels and textfields etc.
I guess that i should use one datasource but in some way have different where clause to each gridview but i've tried it and i only end up with the same data in all of the gridviews.
If it's to complicated to get together i would instead have a new form window apeare with a click of a button. So if i select one row in any of the gridviews and then click edit a new forms window will open for me to edit data in. How can i do that?
Please advice me how i should try to build the application.
For example; Dont use gridviews use this or that instead. Dont use splitcontainers use this instad. Use bindingsources... etc.
I really appreciate any help you can provide
I have a page with around 20+ controls. Within this page I have a partial View which I am using to create an editable grid. This grid has Add New Row/Remove Row buttons on click of which data entered in the textboxes in grid row gets added to the grid.
Whenever I click these 2 buttons, my page is getting refreshed due to which whatever data is being entered by the user in the 20+ controls of main page is lost.
I have tried hopelessly searching for solutions quite some time, but still trying my luck out here. Any ideas are appreciated.
Well I recommend you to use full jquery mechanisms to add or remove rows. You can easily add or remove HTML elements. All you have to care about is to maintain the numbering system. I suggest you to use a view model that contains a list of objects that you need to add or remove. At first render it normally by providing list of objects (from database or other source, if required). After this define your add and remove buttons to type button and play with jquery to add remove table rows or even divs. After adding or removing required element, reorganize your numbering. At submit you can use either full postback or ajax postback. If Any confusion, let me know.
I have rapid incoming data (which are basically rows of a tabular data set). As i receive these rows, I merge/upsert them into the data cache. The data has to be shown on a WPF control (an item control).
The problem :
The data is not directly bound to the user control. A series of filter and grouping/aggregation (done using LINQ) is applied on the data before it is shown to the data. Thus what the user sees on the control can drastically change (say he changes the grouping, then all the rows will change).
This is what I am doing as of now :
As the data is coming in VERY rapidly, a thread is picking up the data every 2 seconds, applying the filter and then grouping the data and binding the data set to the wpf item control.
This is definitely not good as a new data table is being set as the datasource every 2 seconds. The application becomes laggy after some time.
What will be the best approach for me to solve this problem ? Thanks.
I'd say the best way to approach this would be to create a view source and bind the display element directly to that - that way you've got the grouping and filtering systems using the built in stuff.
I'd also then look into virtualisation and optimisation which will help with showing a lot of data.
As a more general note, I'd say explore whether you really need all that data to be displayed and at that frequency; it might be a better user experience (and easier on the machine) to aggregate the data and just surface pertinent details, that the user can then drill-down into further as required.
I want to make a control that show list of bounded data like in grid view but I want to be able to insert new record from the same control
what is the best asp.net control I can use to do that (GridView , FormView or DetailsView)? and why?
Thanks in Advance
You can do that with all three. If you want to know how, there are some good tutorials on the official ASP.NET website, here.
The choice between them is a formatting/layout decision. A GridView produces a table, showing multiple records, while a DetailsView shows one at a time. A FormView lets you display the data however you want, but required much more effort, since you have to provide the HTML.
My current situation is to display an unknown number of Plantypes and within those Plantypes display a list of Participants(also unknown number), the participants have a textbox and a dropdown that is editable (you can't edit the individual rows, there is one update that does a bit of validation then updates all rows.)
I currently have a gridview nested withing a repeater, the repeater displays the Plan in a label and OnItemDataBound I call a method to populate the gridviews. It looks great, but I can't figure out how to save all the data at once. I'm not opposed to handling this a different way, as in loose the gridview and or repeater, if someone has a better idea.
This is C# and framework 2.0...there is no sorting or paging on the gridviews...just some links and the fields to update.
thanks in advance,
Padawan
HTTP is stateless. Since a user physically can only update one record at a time you should implement some way to save as the user goes. This can be a simple as having a row focus and row blur events and do the saves using AJAX on blur(unfocus). Maybe make is modal as they edit so they cannot leave the page without saving.