I have a control (ascx) that has an itemtemplate for inserted service locations. What I am trying to do is OnDataBound event have an item already added upon the listview showing. The listview is for city and state. I have been trying to use the ListViewItemInsertArgs, but the signature is wrong. Been trying to figure this out for days..
protected void lvServiceLocations_DataBound(object sender, EventArgs e)
{
ListView lv = sender as ListView;
var lvi = new ListViewDataItem(0, 0);
lvi.DataItem = da_User_Data.Select_Applicant_Specific_Results(userProfileId, dlControlId); //this returns a string
lv.Items.Insert(0, lvi);
}
<asp:ListView ID="lvServiceLocations" runat="server" DataSourceID="sdsServiceLocations" DataKeyNames="user_service_location_id" InsertItemPosition="FirstItem"
OnItemInserting="lvServiceLocations_ItemInserting"
OnDataBound="lvServiceLocations_DataBound">
<LayoutTemplate>
<table class="location-selection-table ui-widget-content">
<tr><th colspan="4" class="ui-widget-header">Locations</th></tr>
<tr id="itemPlaceHolder" runat="server" />
</table>
</LayoutTemplate>
<ItemTemplate>
<tr class="location-selection-item-row">
<td class="location-selection-actions"><asp:LinkButton runat="server" Text="Remove" CommandName="Delete" /></td>
<td><%# Eval("selected_state") %></td>
<td><%# Eval("selected_county") %></td>
<td class="location-selection-actions"></td>
</tr>
</ItemTemplate>
DataBound event will only occur if you call the DataBind method, and it will only occur once either Page.DataBind or Ctrl.DataBind is called but in any case it is not in this method where you have to insert the new item but instead you have to add it to the Source of the data set in the datasource and then you reset the control with a DataBind method call.
So you have to insert the new item into the source associated with sdsServiceLocations and not directly into the control
Related
I'm working with an application develop by ASP.NET, the problem I face is using FormView control, the FormView Control has ItemTemplate, InsertItemTemplate and EditItemTemplate.
Below is the code fragment of InsertItemTemplate:
<asp:FormView ID="FormView1" runat="server" DefaultMode="ReadOnly">
<InsertItemTemplate>
<table cellpadding="0" cellspacing="0">
<tr>
<td>
<asp:Label id="lblPS" runat="server" Text="Process Status"></asp:Label>
</td>
<td>
<asp:DropDownList ID="ddlPS" runat="server"></asp:DropDownList>
</td>
</tr>
<tr>
<td>
<asp:Label id="lblAP" runat="server" Text="Action Plan"></asp:Label>
</td>
<td>
<asp:TextBox id="txtAP" runat="server" Width="230px" TextMode="MultiLine" Rows="5"></asp:TextBox>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Button ID="btnSubmit" runat="server" Text="Submit" onclick="btnSubmit_Click" />
</td>
</tr>
</table>
</InsertItemTemplate>
</asp:FormView>
In Page_Load event, I do DataSource Binding into the DropDownList as below:
FormView1.ChangeMode(FormViewMode.Insert);
DropDownList ddlPS = FormView1.FindControl("ddlPS") as DropDownList;
ddlPS.DataSource=GetProcessStatus();
ddlPS.DataBind();
ddlPS.Items.Insert(0, new System.Web.UI.WebControls.ListItem("- Please Select -", "- Please Select -"));
The data binding into DropDownList and the "- Please Select -" was ok.
Here the problem comes, when Submit Button click, I wanted to get user selected DropDownList Value, but the DropDownList.SelectedItem.Text always return me "- Please Select -".
Please advise how can I get the user selected value in InsertItemTemplate.
The problem is with your DataBind on Page Load event.
When you DataBind you clear the existing values and hence loose the selected value.
A drop down list remembers the items in it, so you don't need to DataBind on every postback.
Your could should be like this.
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
DropDownList ddlPS = FormView1.FindControl("ddlPS") as DropDownList;
ddlPS.DataSource=GetProcessStatus();
ddlPS.DataBind();
ddlPS.Items.Insert(0, new System.Web.UI.WebControls.ListItem("- Please Select -", "- Please Select -"));
}
}
I have a list view with table inside and i need to get all dropdown lists and file upload controls, but find returns nothing. This is my code:
<asp:ListView runat="server" ID="MyListView" OnItemDataBound="FillDropDownList">
<LayoutTemplate>
<table border="0" cellpadding="2" cellspacing="0">
<tr>
<th>Wholesaler</th>
<th>Import</th>
<th>Period</th>
<th>Upload Date</th>
<th>Upload</th>
</tr>
<asp:PlaceHolder ID="itemPlaceholder" runat="server" />
</table>
</LayoutTemplate>
<ItemTemplate>
<tr class="row1">
<td><%# DataBinder.Eval(Container.DataItem, "Wholesaler") %></td>
<td><%# DataBinder.Eval(Container.DataItem, "Import")%></td>
<td><%# DataBinder.Eval(Container.DataItem, "Period")%></td>
<td><asp:DropDownList runat="server" ID="DaysDropDownList"></asp:DropDownList></td>
<td><asp:FileUpload ID="FileUpload" runat="server" /></td>
</tr>
</ItemTemplate>
</asp:ListView>
DropDownList dr = (DropDownList)MyListView.Controls[0].FindControl("DaysDropDownList");
FileUpload fl = (FileUpload)MyListView.Controls[0].FindControl("FileUpload");
figured...and you got that error, because the listview was not binded yet, so i think the best way would be to do all this on the ItemDataBound event. You would find the dropdownlist like:
protected void FillDropdownlist(object sender, ListViewItemEventArgs e)
{
if (e.Item.ItemType == ListViewItemType.DataItem)
{
DropDownList dr = (DropDownList)e.Item.FindControl("DaysDropDownList");
FileUpload fl = (FileUpload)e.Item.FindControl("FileUpload");
if (dr!= null)
{
//code here
}
}
}
You need to iterate over the Items collection of the listview, and then use FindControl on each item. Something like this should put you on the right track:
foreach (var lvItem in MyListView.Items)
{
if (lvItem.ItemType == ListViewItemType.DataItem)
{
DropDownList dr = (DropDownList)lvItem.FindControl("DaysDropDownList");
FileUpload fl = (FileUpload)lvItem.FindControl("FileUpload");
}
}
That's because MyListView.Controls[0] points to an inner control that does not contain those two.
Try debugging and finding precisely which is your container control, and then accessing it directly without a hard coded index. It's accessible via the event parameter of your row binding calls.
Also might I suggest you use the as operator as it doesn't raise an exception:
The as operator is like a cast except that it yields null on conversion failure instead of raising an exception
i.e.
DropDownList dr = e.Item.FindControl("DaysDropDownList") as DropDownList;
FileUpload fl = e.Item.FindControl("FileUpload") as FileUpload;
or after it's bound
//Loop i for the items of your listview
DropDownList dr = MyListView.Items[i].FindControl("DaysDropDownList") as DropDownList;
FileUpload fl = MyListView.Items[i].FindControl("FileUpload") as FileUpload;
I am finding some serious problems in accessing a button placed in a repeater from code behind.
This is the repeater code:
<asp:Repeater ID="Repeater1" runat="server">
<HeaderTemplate></HeaderTemplate>
<ItemTemplate>
<table>
<tr>
<td>Username:</td>
<td> <%# Eval("UserName") %></td>
</tr>
<tr>
<td>Date:</td>
<td><%# Eval("CommentTime") %></td>
</tr>
<tr>
<td>Comment:</td>
<td><%# Eval("Comment") %></td>
</tr>
<tr>
<td>
<asp:Button ID="btnDeleteComment" runat="server" Text="Delete" /></td>
</tr>
</table>
<br />
</ItemTemplate>
</asp:Repeater>
And This is the code Behind placed int the page load:
Button btn = new Button();
btn = (Button)Repeater1.FindControl("btnDeleteComment");
btn.Visible = false;
Am I missing something?
Thanks
I am sure, I've solved your problem as to why you are getting the object reference not set.
As you have this conditional statement, if (e.Item.ItemType == ListItemType.Item), when its first iterates it will be a header item type. Since your your button is in the item template, that's doesn't exist in the Header template.
protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item)
{
Button btn = new Button();
btn = (Button)e.Item.FindControl("btnDeleteComment");
btn.Visible = false;
}
}
You can't find the control like this. What you need to do is attach an event to repeater "item data bound event" and in that event handler do:
(Button)e.Item.FindControl("btnDeleteComment");
on .aspx
<asp:Button ID="btnDeleteComment" runat="server" Text="Delete" Visible='<# IsAuthor?"true":"false" >' />
in code behind
//global scope
public bool IsAuthor=false;
//in pageload event
IsAuthor= GetIsAuthor();
I want to implement an apperance as this article mentioned using nested ListView control. However, in my scenario, I cannot use EntityDataSource control so I bind data manually.
My table:
Categories
PK: UniqueId, Guid
Name, string
ParentId, Guid
<asp:ListView ID="CategoryList" runat="server"
onitemdatabound="CategoryList_ItemDataBound">
<LayoutTemplate>
<table>
<asp:PlaceHolder ID="itemPlaceHolder" runat="server"></asp:PlaceHolder>
</table>
</LayoutTemplate>
<ItemTemplate>
<tr>
<td colspan="2"><%# Eval("Name") %></td>
</tr>
</ItemTemplate>
</asp:ListView>
protected void Page_Load(object sender, EventArgs e)
{
using (PractiseEntities context = new PractiseEntities()) {
var result = from categories in context.Categories
select categories;
CategoryList.DataSource = result;
CategoryList.DataBind();
}
}
I want the sub category have an indent by add a <td> tag to the item which "ParentId" is not null. And my question is how to edit the generated html tags in the ItemDataBound event?
You could have something like this:
<ItemTemplate>
<tr>
<td colspan="2"><%# GetParentContent(Eval("ParentID")) %></td>
</tr>
</ItemTemplate>
in the code-behind:
protected string GetParentContent(object ParentID)
{
if(ParentID!=null)
... return parent HTML ...
else
return "";
}
Greetings!
I'm looking for some advice regarding an approach to displaying data in a FormView based on a selection of a DropDownList within that FormView control. For example, I have a UserControl with the following:
<asp:XmlDataSource ID="xdsMyXmlData" runat="server" EnableCaching="false" XPath="Root/Membership" />
<asp:FormView ID="fvwMyFormView" runat="server" DataSourceID="xdsMyXmlData">
<ItemTemplate>
<div>
<h2><%# XPath("Title") %></h2>
<fieldset>
<asp:DropDownList ID="ddlMemberTypes" runat="server" DataSource='<%# XPathSelect("MenuItems/*") %>'></asp:DropDownList>
</fieldset>
<table>
<thead>
<tr>
<th><%# XPath("Columns/Name") %></th>
<th><%# XPath("Columns/Age") %></th>
<th><%# XPath("Columns/DateJoined")%></th>
</tr>
</thead>
<tbody>
<asp:Repeater ID="rptMembershipInfo" runat="server" DataSource='<%# XPathSelect("Members/*") %>'>
<ItemTemplate>
<tr>
<th><%# XPath("Data/Name") %></th>
<td><%# XPath("Data/Age") %></td>
<td><%# XPath("Data/DateJoined") %></td>
</tr>
</ItemTemplate>
</asp:Repeater>
</tbody>
</table>
</div>
</ItemTemplate>
</asp:FormView>
The UserControl's OnLoad() looks like this so far:
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
string l_XmlData = MyControllerClass.GetMembershipTableXml(0);
xdsMyXmlData.Data = l_XmlData;
}
I would like to be able to pass the value of the DropDownList's selected item into GetMembershipTableXml() in order to retrieve the corresponding XML and then use it to populate the values of the FormView. What would the best way be to do this? Doing a Response.Redirect back to the current page using the selected DropDownList value as a query string variable? I'm hoping there's a better approach. What do you think?
You can create an event for OnSelectedItemChanged on your DropDownList; when this occurs, you can grab the selected item, and call your GetMembershipTableXml function.
Finally, dont forget to call DataBind on your FormView control to update the values :)
I think that's what you're after, hopefully it helps!