After Selecting An Item To Edit In A Listview, What Happens Between Each Cycle Of OnItemDataBase
Mar 14, 2011
For some reason, I get an error half way through cycling through my items in a listview right before a record that has a null value for one of its items. It doesnt' haappen any other time. It happens after completing one cycle of the onItemDatabound eventfor a record in a row that is immediately before a particular null value in record immediatley following.My code is written to look for the proper edititemindex, and if it sees it, then it checks for null values for all the items. I can't even get that far, it errors just before the onItemDatabound even runs for the correc edit index
I have a listview set up in "flow" mode where the existing records are all on an extended page so you can scroll down to any record.
The InsertItem Template is in the first position, making it easy to insert a new record.
And one can scroll down the page to any record, click the edit button and update that record -- nice having everything on one scrollable page.
I am running into a problem with validations. I have validation controls restricting inputs for all the textboxes on the Insert Item template. They work fine. And on Item Inserted I am running a page validation:
Page.Validate() If Not Page.IsValid Then e.Cancel = True End If
which works fine also.
The problem occurs when I scroll down to an existing record, and go to edit it. I have all the same validation constraints on the textboxes for the EditItemTemplate as I have on the InsertItemTemplate. But I cannot successfully do a page validation on updating the record. The code I am using on update is:
Protected Sub LVRentals_ItemUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewUpdateEventArgs) Handles LVRentals.ItemUpdating Page.Validate() If Not Page.IsValid Then e.Cancel = True End If End Sub
This results in a Cancel even if there are no validation errors on the InsertItemTemplate because the Page.Validate() seems to be causing the InsertItemTemplate to think its fields should be filled out also.
Here is the code for a typical entry of the InsertItem Template:
[code]....
All the controls in the Edit Item template are part of ValidationGroup "edit1" and those of the InsertItem Template are part of ValidationGroup "edit2"
How can I get around receiving validation errors on the InsertItem Template when I am trying to validate just the EditItemTemplate when both are present on the page?
May be I'm trying to run before I can walk, but here goes, I find coding for ASP so frustrating it's just not logical JIM!Anyways after my rant, as I'm a huge fan of the listview control in WinForms I'm trying to get the hang of it in ASP, wth not much luck so far.
I have a Listview showing my data from the DB.And i have a Formview in INSERTMODE.I added a linkbutton the my Listview, in order to EDIT the data.How could i use the same Formview to Edit the item ? Will i have to change the DEFAULTMODE ? And how can i pass the Id to it ? Will i have to alter the SELECT COMMAND aswell to that it gets the querystring "ID" ?
I am trying to do this with many issues of data binding doubling the amount and not setting selectedValue on dropdownlist. I have read some posts and they help but I am missing a crucial piece. My problem is that my dropdownlist is doubling the amount of records for the dropdownlist. Instead of "YES;NO;SELECT A VALUE", I am getting "YES;NO;SELECT A VALUE;YES;NO;YES;NO". My database is correct with the UPDATE part but the rebind after update is failing horribly.
I have a "report" the users can run it basically creates a simple gridview. In the gridview the user can click on a claim ID. The claim id is then passed via url querystring to a claim management page. The claim management page uses a listview to display the various claims and allow users to edit them. I want to use the claim id passed in the url to locate the listview row to open in edit mode, so the user can make changes / alterations to the claim.
I've a listview in which i'm binding data from objectdata source. I have a requirement where i've to allow edit/delete for only certail listviewitem which meets specific requirement. How do i dynamically set that some item can be only be edited not deleted thus only edit button/link should appear and vice-versa.
I'm trying to built in my web site the possibility to loud equal fields in the "select" page(when the user select item , I would like items that are related data in the "name column"ill be fire hopefully I'm clear That I have tried doing was in my repository I have written:
Suppose I have a list of a couple of thousand organizations and a user needs to be able to select one of them. The list is too large to populate in a dropdown at page load, and the user often knows what they want but it's not the first part of the organization name. That is, they know "Collections" but not that the precise name of the organization is "Department of Collections". So the user will need/want to type in some information.
It's easy enough to use an autocompleting textbox of some kind, but I don't want to allow the user to type in random text - they have to choose one of the organizations explicitly.
I am trying to set the item that is selected from a drop down list based on what it in the database for that particular record. I am filling the dropdown list with a SQL DataSource I have tried a couple of example that I have found for selecting the item in the list but I am always getting the first item in the list as the selected item. This is what I am currently working with:
Code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
i have used one drop down list box...in that ....whn i m running web applicaiton i need to stick the value which i m selected for the movement upto i select the next choice. it is always going to the first value always. i have 40 items in my drop down. whn i select the 5TH item after selecting 5th item it going to first item.
I have a drop down box with values that shows on loadUnited States Canada Now I have a function that is checking the users value from the database which is fired on a button click. What I plan on doing is comparing the string like if United States(db value) == United States (dropdown value) then go ahead and select United States in the drop down. When I do this I am getting the right value selected but it is making all the values the same for all records.
i am using a treeview control in my master page to act like a menu.it has different nodes levels e.g. root, parent and left.when i click an item from the tree view - i am taken to the page - but the tree view goes to its orginal state of being collapsed rather than keeping its state of nodes that have been expanded.does anyone know how i can maintain the state of the tree view in the master page
However, if a user clicks on this more than one click the newer value replaces the previous. Is there a way to keep adding to the cart list when the user clicks on a new item?
Edit:
Here's my code for the Shopping Page:
[Code]....
I dont know if the location of creating the list is important? Wasn't sure if it was placed in the click event if it would keep creating a new instance?
I have several asp dropdownlists that are populated from a database. I would like it so that when an item is selected it opens a seperate page depending on the selection.
[Category("Settings")] public int ClientID { get { return Int32.Parse(DropDownList1.SelectedItem.Value); } set { DropDownList1.Items.FindByValue(value).Selected = true; } }
Getter commonly is being called by ControlPameters in SqlDataSources on pages with this control.
Setter - from markup: <uc:UserControl1 runat="server" ClientID='<%# Bind("ID") %>' />.
Why does setter from Bind is called earlier then PreRender? And DropDownList is empty and item selecting doesn't work! How to workaround this behavior?
I have created a ListView that has editing enabled, the wizard generated the table with the use of textboxes but i require the use of dropdown lists for some options. I have created the dropdown list
i have the following problem. i'd like to use a listview with paging for mulitple selection of items in a list. The selection is no problem. I do have f.i. a list which holds the key values.
List<Int64> selectedList = new List<Int64>();
As soons as the user makes a selection or removes a selection the list will be updated accordingly. Also hold this list info when changing pages of the listview.
[Code]....
This list can be stored either in a session or a viewstate.
My question is how can i retrieve the information of the list back into my listview and thus displaying the selection the user has made when he jumps from page to page.
In my project requirement user wants to enter a manual entry if they can not find an item in the drop down list.
Right now what I am doing is:
I set the dropdown list autopost back true and on selectedchanged event I am hiding the drop down list and showing a text box to enter a manual entry...
This is working perfect and no problems..
but the drop down list needs to change to a text box on only selecting a "unknown" option in the list...all other list items are doing unnecessary post back to the server with no use...
The following example displays a modal dialog box when the user clicks the button.What changes do I have to make to get it to display the dialog when a selection is made from the dropdownlist?
Note that if I set the TargetControlID property from "Button1" to "DropDownList1", teh dialog box is displayed when the dropdown is DROPPED rather than when a selection is actually made.
I'm trying to figure out some alternate ways of dealing with a smaller subsets of records from a larger set of records. This would be to increase performance and make it easier for the user to navigate, as opposed to trying to navigate a really large unwieldy record set. I know of a few ways a user can select a record from a record set. Selecting from a Grid View, drop down list, list box are some the first ones that come to mind. Another way I've seen, I think it was done with a repeater or User Control, is to list all of the letters in the alphabet as links and then only return the records that correspond to the letter that was selected.
It could also be done to allow the user to search by last name, first letter of the last name or some other similar method. I'm curious if there are any other ways of doing this. Does anyone know any other techniques that would create a better user experience when selecting a record or subset of records from a large record set?
