I have this GridView that have it's DataSource as a list of previously selected products.
For every item on it, I need to Eval it's ID and load a specifc form that the user must fill, then after that i've got to update the GridView.
I have made those specific forms as User Controls, is this the best approach for this scenario?
If yes, how can I dynamically load them, in a way that I can make queries/postbacks then update back my gridview?
What you want to develop is called Master/Detail view.
It is described for example in http://www.asp.net/data-access/tutorials/master-detail-using-a-selectable-master-gridview-with-a-details-detailview-cs .
The only difference that as Detail you need use FormView, where on some initialization event (like DataBound http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.basedataboundcontrol.databound.aspx )you need to dynamically create you control and set its parent to current template of FormView
Related
I am creating a set of tables, dropdowns, buttons, labels dynamically on OnInit() event on the basis of list of objects( fetched from database). I have bound events with these dynamic controls as well.
On dropdowns_SelectedIndexChanged event I have to populate my list of objects again from database on the basis of selected value and recreate these tables, labels again.
First time dropdown selection is working fine for me, but as soon as I am recreating control here on dropdowns_SelectedIndexChanged, the event of dropdowns are not bound (as it is compulsory to add dynamic controls on OnInit() to bound events with them) .
Now for an alternative I am trying to get dropdown's selected value on any Page event near by pre_render() so that I could recreate my controls there with updated objects List without any dropdowns_SelectedIndexChanged event.
Any help will be appreciated. Thanks in advance.
Yes, here is one nasty way!
You can index the Request.Form["__EVENTTARGET"] that should get you what your after.
BUT I wouldn't necessarily/always recommend it. Even when adding controls dynamically you should be able to get the selected value, in the correct event handler. It's probably owing to where you are adding the control in the page lifecycle.
I've got a Repeater control, bound to a PagedDataSource, which datasource is a list of custom controls I've made. These custom controls contains a couple of text boxes.
I have a save button, and when it is clicked I want to save the data in all the custom controls to a database, no matter which page they are on - but currently I only got access to the custom controls displayed on the current page.
What I've tried to do is to, in the btnSave_Click event, create a new temporary datasource equal to the current one, except its not a PagedDataSource. That way my repeater contains all custom controls - BUT - the changes made in the textbox fields are no longer available. I then tried to add JavaScript onchange events on the textboxes in the custom control, so that a postback would be fired whenever text was changed, and the property in the user control codebehind would be updated. This didnt work either.
Any ideas?
save the changed values on each page index changing event (or prev /next buttons) into your persistance object (List)
http://www.dotnetfunda.com/articles/show/1611/how-to-select-multiple-records-from-multiple-pages-of-the-gridview-and
The reason your non-PagedDataSource is empty is because the changes in your text box exist in the client and not on the server - you'll need to synchronise the values from your controls with the empty slots in your repeater.
The Repeater does not have built-in Pagination (like the GridView or other complex controls) so it does not offer events such as the PageIndexChanging event. I assume therefore, that you have your own Page navigation implementation. You should therefore call the function you have presented within that implemented function.
Try Using a generic List and Skip and Take methods of that
I have requirement in my application where I am struck . These is my scenario:
Initially I need to show up two text boxes with a check box and a button. upon clicking the button we need to generate one more row. Like wise we need to create multiple rows dynamically.
Initially I tried with Table Control but after struggling a lot, I came to know that we can create only one row dynamically using Table Control. So now I am planning to do in repeater control.
In this kind of scenario, it would be better to use the GridView Control Instead, take a look here some working examples:
http://www.revenmerchantservices.com/page/gridview-add-new-row.aspx
http://amitpatriwala.wordpress.com/2008/04/18/inserting-new-row-in-gridview-in-aspnet-20/
This old chestnut again.
My page is constructed as follows; I have a dropdownlist which is databound on first load. When the user selects a value from this, a postback is performed which then databinds a repeater control.
The ItemTemplate of this repeater control contains a placeholder control. In code behind in the ItemDataBound event of the repeater, I am adding two controls dynamically to this placeholder, a hiddenfield and a checkbox.
When the user clicks the save button, I then want to iterate over all those dynamically created hiddenfields and checkboxes and determine their values. However when the user clicks the save button, those controls no longer exist as shown in the page trace.
I know this is a lifecycle issue and the articles I've seen on this suggest using Init methods to dynamically create your controls but I can't because of the way my page works, e.g. the repeater control only appears and binds after a value is chosen from the dropdownlist.
What do I need to do to maintain the dynamic controls through the postback caused by clicking on the save button?
The problem is when you hit the save button probabily you dont re-bind the repeater and the controls you have added at run time withint the ItemDataBound event are not longer available(because they don't exist anymore)
Why don't you add those control at design time using the Eval function the set up the value of the hidden field?
You just don't create them dynamically just on the on selection change of the drop-down set visibility true or false for the repeater that will solve your problem.on post back you have to again create those control as they are Dynamically created.
I have a table similar to:
ID...NAME.....HTMLTEXT
1....Footer....`<b>test</b>`
where each entry has some HTML text and an associated Name and ID.
What I want to do in ASP.net C# is to list each of these entries on a page in such a way that the HTML text should be displayed exactly how it is meant to be (e.g. <b>test</b> should show 'test' in bold) and each entry should be editable. When the Edit button is clicked on an entry, the HTML text should be replaced by a textbox with the text inside it so that you can edit it and save it.
For example:
FOOTER --EditButton--
TEXT
test
Now I am not sure on what is the best way to do this. Should I use a repeater with an ItemTemplate for each entry? If I use a repeater, and an edit button is clicked, how do I know which edit button is clicked and how do I know which textbox to display the text etc?
You could also use a ListView - I tend to use this because its pretty robust. The data bound controls support the <%# Bind("Field") %> statement. You setup your templates in ItemTemplate or EditItemTemplate, and if you add the proper commands to the buttons in the UI, it all wires up the proper events for you (depending on how you data bind). If you don't use a datasource control, you have to manually tap into the ItemEditing, ItemUpdating, etc. events.
Additionally, if you need to, you can get references to the controls using the current item's FindControl("ID") method.
HTH.
Create a custom control (.ascx) and on this control make the line with the view that you wish, and handle the change/save/delete etc.
Then place this control in the repeater and just give him an id to load and edit.