I have a data repeater that is binding to an ObjectDataSource on a page. I have the select working but I am having a problem with the Update. When I call a Save button what I want to do is call the function specified in the UpdateMethod and pass it in a parameter of the changed object of the repeater. Problem is I can't figure out how to get the object back out of the repeater. I do not want to specify each individual field as an update parameter as that is really unwieldy and defeats the purpose of data binding. Any help on this would be great.
<%# Page Language="VB" %>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:Repeater ID="Repeater1" runat="server" DataSourceID="ObjectDataSource1" ItemType="CompanyObject">
<ItemTemplate>
<asp:Label ID="Label2" runat="server" CssClass="clsLabel">Company:</asp:Label>
<asp:TextBox ID="txtCompany" runat="server" Text='<%# BindItem.Company%>'></asp:TextBox>
</ItemTemplate>
</asp:Repeater>
<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
SelectMethod="GetData" TypeName="WebApplication1.CompanyObject"
UpdateMethod="UpdateCompany" DataObjectTypeName="CompanyObject"></asp:ObjectDataSource>
</form>
</body>
</html>
Here is the code behind that I want to call:
Public Function UpdateCompany(ByVal company As tblCompany)
'Save the Value here except that company is always null
End Function
Private Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click
ObjectDataSource1.Update()
End Sub
You can't do that with a Repeater control: it doesn't keep a copy of the objects to which it was bound. It doesn't do two-way binding.
But other controls do. Check out the FormView, GridView, and DetailsView. For a full treatment of the subject, see here.
I'm not sure I completely follow what's going on here, and I don't have enough reputation to ask in a comment. Where is your save button? I'm guessing it's outside the repeater. Are you trying to save all the companies that appear in your repeater, or is there only one company anyway? What are you trying to get back out of the repeater? Just the company name that's in the textbox? A few more details may provide the help you're looking for.
Also, it might be helpful to add an OnUpdating event to your ObjectDataSource and handle that in your code behind.
<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"
SelectMethod="GetData" TypeName="WebApplication1.CompanyObject"
UpdateMethod="UpdateCompany" DataObjectTypeName="CompanyObject"
OnUpdating="Company_Updating"></asp:ObjectDataSource>
And then your code behind:
Private Sub Company_Updating(ByVal s As Object, ByVal e As ObjectDataSourceMethodEventArgs)
' use e.InputParameters here to pass in the values you need
End Sub
You can see here for an example of how to use InputParameters.
Update
To answer your question, you should be able to use the following to get the value out of the textbox in the repeater:
Protected Sub Company_Updating(ByVal s As Object, ByVal e As ObjectDataSourceMethodEventArgs)
If (Repeater1.Items.Count > 0) Then
e.InputParameters.Add("CompanyName", CType(Repeater1.Items(0).FindControl("txtCompany"), TextBox).Text
End If
End Sub
But I think a repeater is unnecessary for what you're trying to do here. A repeater is generally used to show a collection of items. If your goal is to simply show one company, couldn't you set the Text property of the TextBox control in your code behind?
Protected Sub Page_Load(ByVal s As Object, ByVal e As EventArgs) Handles Me.Load
If (Not Page.IsPostBack) Then
txtCompany.Text = yourCompanyObject.Name
End If
End Sub
This is not possible with the approach you are following.
We can for sure develop a custom Post Back to achieve the desired output.
Related
Here is my drop down list and data source. My question is.. when is it possible to set a defaulted selected option for the drop down list, aka when have all the dropdownlists been databound and their ListItems populated? I have tried Page_PreRender, Page_PreRenderComplete, Page_Load.
I have read over MSDN's Page Life cycle event which suggest Page_PreRender.
<asp:DropDownList ID="ddlRampStandard" runat="server"
DataSourceID="RampStandardDataSource" DataTextField="StandardName"
DataValueField="StandardName" RepeatDirection="Horizontal"
ViewStateMode="Enabled"></asp:DropDownList>
<asp:SqlDataSource ID="RampStandardDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AIMP_DeleteMeConnectionString %>"
SelectCommand="SELECT [StandardName] FROM [CR_Standard]"></asp:SqlDataSource>
Here's the simple code-behind which illustrates what I'm trying to do.
Protected Sub Page_PreRenderComplete(sender As Object, e As System.EventArgs) Handles Me.Load
ddllstSideOfStreet.Items(0).Selected = True
End Sub
I'm getting an instance not created error suggesting ddllstSideOfStreet has no items. I do verify that with a breakpoint and watch that there are no items in existence in any of the previously mentioned prerender, load, prerendercomplte functions.. However when the page loads, the dropdownlist does indeed load with the expected databound information. Thoughts?
just to make sure, have both the handler in the markup and the method using the correct handler in the code behind.
Like this:
Protected Sub Page_PreRender(sender As Object, e As System.EventArgs) Handles Me.PreRender
End Sub
And the markup as follows:
<asp:DropDownList ID="ddlRampStandard" runat="server"
DataSourceID="RampStandardDataSource" DataTextField="StandardName"
DataValueField="StandardName" RepeatDirection="Horizontal"
ViewStateMode="Enabled" OnPreRender="Page_PreRender"></asp:DropDownList>
Tried a similar solution on my machine a moment ago and it worked.
I have the following button:
<asp:ImageButton ID="imgbtnEditInfo" runat="server" ImageUrl="~/images/EditInformation.png" AlternateText="EditInformation" CommandName="EditDetails" CommandArgument="<%# Container.DataItemIndex %>" OnClick="lnkEdit_Click" Enabled="true" />
I have the following method but looks like it is not hitting the method:
Protected Sub lnkEdit_Click(ByVal sender As Object, ByVal e As System.EventArgs)
End Sub
Wondering if I am missing something. I put a breakpoint on the Protected Sub lnkEdit_Click but on click of the imagebutton I do not go there.
You're working with Data Controls (GridView or DataList etc). To respond to the button/linkbutton/imagebutton events, you must have to handle the parent - data control's events.
Without seeing more of your page it is hard to say. A couple things to check:
Is the ImageButton inside a <form runat="server">?
Have you compared your page to the VB sample at ImageButton Class to see if anything might have been missed?
Warning! This problem is not for the feint of heart. I've spent several days in all trying to troubleshoot it.
I have a Wizard control with about 5 steps, each with several controls ranging from very simple to very complex such as custom jQuery combo boxes based on DropDownLists and TextBoxes. Each step has several of the controls wrapped in a PlaceHolder control.
The Wizard along with all PlaceHolders and their child Controls are nested inside of a View of a MultiView. On the same page I have another View styled like a Form, but not one. This view has corresponding PlaceHolders for each of PlaceHolders within each step of the Wizard.
Depending on the ReferralUrl I call the following function to "Toggle" the view from the Wizard to the form style view by moving all the controls, then setting the active view as follows:
Protected Sub ToggleView() Handles ViewToggle.Click
If Wizard_mv.ActiveViewIndex = 0 Then
ViewToggle.Text = "Toggle Wizard View"
fPH1.Controls.Add(wPH1)
fPH2.Controls.Add(wPH2)
fPH3.Controls.Add(wPH3)
fPH4.Controls.Add(wPH4)
fPH5.Controls.Add(wPH5)
Wizard_mv.ActiveViewIndex = 1
ElseIf Wizard_mv.ActiveViewIndex = 1 Then
ViewToggle.Text = "Toggle Form View"
wPH1.Controls.Add(fPH1)
wPH2.Controls.Add(fPH2)
wPH3.Controls.Add(fPH3)
wPH4.Controls.Add(fPH4)
wPH5.Controls.Add(fPH5)
Wizard_mv.ActiveViewIndex = 0
End If
End Sub
Immediately after this, I use another function for pre-filling the controls with values from a record in a database. After allowing the users to make some changes, they may resubmit the updated record to the database. The problem is that this works just fine if I do so from the Wizard but not after toggling. The trace shows that the Control Tree is empty at the time of submitting the updated record, and hence I cannot grab the user-entered/pre-filled values from this view. The pre-filling works great and the "Selected" values are all correct. The problem arises on the PostBack after clicking submit and it loses all the values and controls.
Please do not answer unless you fully understand my problem and are willing to help. I think the problem very well lies within the page lifecycle. Mysteriously, when I submit from my Wizard, on the postback in Page_Init I get my control values loaded, however when I submit from my form view, neither the controls nor their values are loaded. From what I read, this is an issue of persistence. Really hoping there's a relatively easy solution for this.
Here's a sample of my markup in my Wizard (all styling removed for brevity):
<asp:WizardStep ID="WizardStep1" runat="server" Title="Product Info">
<asp:PlaceHolder ID="wPH1" runat="server" ViewStateMode="Enabled">
<asp:Table ID="ProductInfoTable" runat="server" Width="100%">
<asp:TableHeaderRow>
<asp:TableHeaderCell><h3>Product Line</h3></asp:TableHeaderCell>
<asp:TableHeaderCell><h3>Publication Type</h3></asp:TableHeaderCell>
<asp:TableHeaderCell><h3>Request Type</h3></asp:TableHeaderCell>
</asp:TableHeaderRow>
<asp:TableRow>
<asp:TableCell>
<div class="ui-widget">
<!-- Autocomplete Combobox -->
<asp:DropDownList ID="productLine_ddl" runat="server" DataSourceID="productLineSDS" ViewStateMode="Enabled" DataTextField="Product" DataValueField="ID"></asp:DropDownList>
<asp:TextBox ID="productLine_cb" runat="server" EnableViewState="True"></asp:TextBox>
<button id="productLine_btn" type="button" title="Show All Items"></button>
</div>
</asp:TableCell>
<asp:TableCell>
<asp:DropDownList ID="docType_ddl" runat="server" DataSourceID="docTypeSDS" DataTextField="DocType" DataValueField="ID"></asp:DropDownList>
</asp:TableCell>
<asp:TableCell>
<asp:DropDownList ID="requestType_ddl" runat="server" DataSourceID="requestTypeSDS" DataTextField="RequestType" DataValueField="ID"></asp:DropDownList>
</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell ColumnSpan="2">
<asp:MultiView ID="Attachment_mv" runat="server" ActiveViewIndex="0">
<!-- File Upload/Browsing Display -->
<asp:View ID="AttachmentUploadView" runat="server">
<h3 class="inlineH">Attach File: </h3>
<asp:FileUpload ID="AttachmentFile_btn" runat="server" />
<asp:Button ID="UploadFile_btn" runat="server" Text="Upload File" />
</asp:View>
<!-- File Attached Display -->
<asp:View ID="FileAttachedView" runat="server">
<h3 class="inlineH">Uploaded File: </h3>
<asp:Label ID="FileAttachedLabel" runat="server" Text="Label"></asp:Label>
<asp:Literal ID="FilesOnServer" runat="server" />
</asp:View>
</asp:MultiView>
</asp:TableCell>
</asp:TableRow>
</asp:Table>
</asp:PlaceHolder>
</asp:WizardStep>
My Page Lifecycle Events, as requested (in chronological order for your convenience) :)
Dim referrerPage As String
'Initialize Dynamic controls here. These are controls that need to be prefilled, etc.
Private Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Init
'DO NOT PREFILL at this stage, as the Controls are not yet rendered and will cause errors.
' Use this section for detecting the "referrerPage" and missing "id" parameters when expected, etc.
If Not IsPostBack Then
ViewState.Clear()
End If
Try
referrerPage = Right(Request.UrlReferrer.AbsolutePath, Len(Request.UrlReferrer.AbsolutePath) - Request.UrlReferrer.AbsolutePath.LastIndexOf("/"c) - 1)
Catch ex As Exception
If Not String.IsNullOrEmpty(Session.Item("referrerPage")) Then
referrerPage = Session.Item("referrerPage")
End If
End Try
If StrComp(referrerPage, "wizard.aspx") <> 0 And String.IsNullOrEmpty(Session.Item("referrerPage")) Then 'Initialize Session state to remember "referrerPage"
Session.Add("referrerPage", referrerPage)
End If
If StrComp(referrerPage, "formdetails.aspx") = 0 Then
If String.IsNullOrEmpty(Request.Params("id")) Then
'This line checks for an expected "id" param value and if none exists, forwards the page back to "tcom.aspx"
Response.Redirect(Request.UrlReferrer.AbsolutePath)
Else
ToggleView()
End If
End If
End Sub
'Prefill Dynamic controls here.
Private Sub Page_PreLoad(sender As Object, e As EventArgs) Handles Me.PreLoad
If Not IsPostBack Then
productLine_ddl.DataBind()
docType_ddl.DataBind()
requestType_ddl.DataBind()
'...and several more DataBinds for each individual
' control in the wizard. Nothing more.
End If
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not IsPostBack Then
'Benign code for querying the database to get User info for Page.User.Identity.Name
End If
End Sub
Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As EventArgs) Handles Me.PreRender
If Not IsPostBack Then
'Here is completely benign code for hiding a couple controls.
End If
End Sub
Protected Sub Page_PreRenderComplete(ByVal sender As Object, ByVal e As EventArgs) Handles Me.PreRenderComplete
'PREFILL HERE when appropriate. This occurs after checking the "referrerPage" and ensuring a value for the "id" parameter.
If Not IsPostBack Then
Try
If Not String.IsNullOrEmpty(Request.Params("id")) Then
PrefillWizard(Request.Params("id"))
Else : output.Text += "Source: " + Request.UrlReferrer.AbsolutePath
End If
Catch ex As Exception
End Try
End If
End Sub
To anyone who can help with this, you have my eternal gratitude. ;)
The problem is that the control tree of the page must be exactly the same during every postback. That means that you have to add all the control every time no mater which ActiveViewIndex is set. Preferably in CreateChildControls or page init. In the ToggleView function you can than set the visibility of the controls.
I have an ASP.Net page, which displays a list of options to the user. When they select from the list, it does a post back and queries a sql server. The results are displayed in a listview below the options in an update panel. Below is a snippet of the ItemTemplate:
<asp:LinkButton Text="Save IT" OnCommand="SaveIt" CommandArgument="<%# Container.DataItemIndex %>" runat="server" />
The DataItemIndex does not appear, so my commandargument is empty. However, the object sender is the button, which shows the item.
Why is the index item not appearing in the CommandArgument?
Could it be the post back? If so, why would it be the post back? Is there a way around it?
Edit:
Sorry, from my attempts to solve it before, I posted bad code, but it still isn't appearing.
Resolution:
I found another work around in that the sender of the OnCommand is the link button, which has the CommandArgument. I will chalk this issue up to be an issue with multiple postbacks and javascript.
You can't use the <%= %> syntax inside properties on a tag with a runat="server" attribute. I'm surprised the code will even run. :)
UPDATE:
You probably want to use the ItemDataBound event on the repeater, find the linkbutton and set the CommandArgument property.
Not very elegant, but here's a VB.NET sample.
Private Sub Repeater1_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles Repeater1.ItemDataBound
Select Case e.Item.ItemType
Case ListItemType.Item, ListItemType.AlternatingItem
Dim b As LinkButton = e.Item.FindControl("btn")
b.CommandArgument = e.Item.ItemIndex
b.DataBind()
End Select
End Sub
You're not setting it
You possibly want
<%# Container.DataItemIndex %>
or
<%= Container.DataItemIndex %>
:)
Try
<asp:LinkButton Text="Save IT" OnCommand="SaveIt" CommandArgument="<%# Container.DataItemIndex %>" runat="server" />
You were missing the "#" sign.
This site really helped me with this problem: http://forums.asp.net/t/1671316.aspx
The issue I ran into was that I was being passed null arguments in the commandargument when I clicked on the button a second time. As the post above explains, this is because commandargument is only set in the databind event. So, to fix this, include a databind event in the page_load sub
Ex. (VB)
Private Sub BindSelectButtons()
'Purpose: bind the data to the select buttons for commandargument to be used
Dim i As Integer
For i = 0 To gridview1.Rows.Count - 1
gridview1.Rows(i).Cells(8).FindControl("btnID").DataBind()
Next
End Sub
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
'Rebind select buttons so that the commandargument refreshes
BindSelectButtons()
End Sub
Make sure View State is enabled
e.Row.EnableViewState = true;
I want to access the data associated with the RepeaterItem in which an ItemCommand fired up. The scenario is, I have multiple RepeaterItems which Button controls in which the Command is set declaratively like this:
<asp:Repeater ID="Repeater3"
runat="server"
DataSource='<%# ClientManager.GetClientEmployees(Eval("ClientID")) %>'
OnItemCommand="RemoveEmployeeFromClient">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1"
runat="server"
Text="(x)"
CommandName="RemoveEmployeeFromClient">
</asp:LinkButton>
</ItemTemplate>
<SeparatorTemplate>,<br /></SeparatorTemplate>
</asp:Repeater>
The code behind is:
Protected Sub RemoveEmployeeFromClient(ByVal source As Object,
ByVal e As RepeaterCommandEventArgs)
' I want to access the data associated with
' the RepeaterItem which the Button was clicked.
End Sub
You can use e.Item.DataItem to get down to the data for the object, or you could store it in a hidden field.
Building on what Mitchel said, make sure you check to see that the RowType is DataRow. Don't want to do crap when you can't. The cast from e.Item.DataItem to your type would fail on the header or footer row.