Hi have the following vb code in ASP.NET:
<asp:Repeater ID="Repeater1" runat="server" DataSourceID="SQL_SRC_DEV_HIERACHY">
<ItemTemplate>
<p class="input_title">Hierachy:
<asp:Literal ID="Literal1" runat="server" Text='<%# Eval("Hierarchy_SKey")%>'></asp:Literal><br />
</p>
<asp:DropDownList ID="DropDownList_H" runat="server" DataSourceID="SQL_SRC_DEV_GROUPINGDESCS" DataTextField="Description" DataValueField="FTE_PARENT_SKEY"></asp:DropDownList><br />
</ItemTemplate>
</asp:Repeater>
I now need to get the selectedvalues for each instance of dropdown created, and += to a variable so that I can built a SQL INSERT command based on the selected values.
Can anybody point me in the right direction to achieve this please? Thanks.
You can loop the items in the Repeater in code behind and use FindControl to get the SelectedValue of the DropDownList.
protected void Button1_Click(object sender, EventArgs e)
{
//loop all the items in the repeater
foreach (RepeaterItem item in Repeater1.Items)
{
//use findcontrol to locate the dropdownlist and cast it back to one
DropDownList drp = item.FindControl("DropDownList_H") as DropDownList;
//display the result
Label1.Text += drp.SelectedValue;
}
}
Thanks VDWWD - I have converted to VB and it work perfectly! Much appreciated.
VB version shown below:
Protected Sub GEN_CODE()
Dim txtField As DropDownList
Dim DDL_Values As String = ""
For Each item In Repeater1.Items
//use findcontrol to locate the dropdownlist and cast it back to one
txtField = item.FindControl("DropDownList_H")
//display the result
DDL_Values += " " + txtField.SelectedValue
Next
End Sub
Related
I have a gridview displaying data within a template field which requires more information about the record to be displayed by clicking on a linkbutton. Right now, I have the "details" linkbutton display the information by calling the edit command on the gridview so that it switches to the EditItemTemplate. Within the EditItemTemplate I have a linkbutton for cancel and then an edit button that, when clicked, displays the update button with the update command, but I need it to iterate through that row and set all the textboxes within the EditItemTemplate to ReadOnly=false so as to allow them to be edited before the update command is selected. Here is a summary of the code:
<ItemTemplate>
*basic information displayed*
<asp:LinkButton runat="server" CommandName="Edit" Text="Details"></asp:LinkButton>
</ItemTemplate>
<EditItemTemplate>
*A bunch of readonly textboxes that display the extra information*
<asp:LinkButton runat="server" CommandName="Update" Text="Update" Visible="false"></asp:LinkButton>
<asp:LinkButton runat="server" Text="Edit" OnClick="editButton_Click"></asp:LinkButton>
</EditItemTemplate>
And the code for the event which makes the buttons appear the way I want, but I'm not sure how to iterate through the EditItemTemplate, or even if this is what I should do:
Protected Sub editButton_Click(sender As Object, e As EventArgs)
sender.FindControl("updateButton").Visible = True
sender.FindControl("editbutton").Visible = False
For Each t In ?EditItemTemplate?
Dim textbox = TryCast(t, System.Web.UI.WebControls.TextBox)
If textbox IsNot Nothing Then
textbox.ReadOnly = False
End If
Next
End Sub
So my question is either how to get this to work, or how I should set up the GridViewCommands otherwise
You should use a PlaceHolder in your EditItemTemplate. Place all of your Controls/LinkButtons inside this placeholder.
<EditItemTemplate>
<asp:PlaceHolder ID="TestPlaceHolder" runat="server">
// Sample Link Buttons
<asp:LinkButton runat="server" CommandName="Update" Text="Update"
Visible="false"></asp:LinkButton>
<asp:LinkButton runat="server" Text="Edit" OnClick="editButton_Click"></asp:LinkButton>
// Sample Text Box
<asp:TextBox runat="server" ID="FirstName" ...>...</TextBox>
</asp:PlaceHolder>
</EditItemTemplate>
Handle the RowEditing event of GridView. Inside the edit event handler, first find the Placeholder, then use the PlaceHolder's Controls property to iterate over the Controls...
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
// Get the Placeholder for the row being edited.
PlaceHolder testPlacehldr =
GridView.Rows[e.NewEditIndex].FindControl("TestPlaceholder") as PlaceHolder;
// Iterate over the controls
if(testPlacehldr.Controls.Count > 0)
{
foreach (Control ctrl in testPlacehldr.Controls)
{
if (ctrl is LinkButton)
{
LinkButton lnkBtn = ctrl as LinkButton
if(lnkBtn.Text== "Update")
{
lnkBtn.Visible = false;
}
// More IF conditions follow....
}
if (ctrl is TextBox)
{
TextBox txtBox = ctrl as TextBox;
if(txtBox.ID == "FirstName")// use any property of TexBox you prefer
{
txtBox.ReadOnly= true;
}
// More IF conditions follow....
}
}
}
//At the End, set the EditIndex and Bind the data
GridView1.EditIndex = e.NewEditIndex;
BindGridViewData();
}
I hope you can workout the logic yourself now for hiding/showing the controls.
So I figured out how to do it (needed it in vb) by using the placeholder within the EditItemTemplate, here's the code behind it:
Protected Sub editButton_Click(sender As Object, e As EventArgs)
sender.FindControl("editbutton").Visible = False
sender.FindControl("updateButton").Visible = True
Dim testPlacehldr As PlaceHolder = sender.FindControl("TestPlaceholder")
If testPlacehldr.Controls.Count > 0 Then
Dim btn As LinkButton = sender.FindControl("editButton")
If btn.Visible = False Then
For Each ctrl As Control In testPlacehldr.Controls
If ctrl.GetType Is GetType(TextBox) Then
Dim box As TextBox = TryCast(ctrl, TextBox)
box.ReadOnly = False
End If
Next
End If
End If
End Sub
This works fine for what I need it to do. Credit to the user R.C. for the idea about placeholders
I have a CheckBox inside a Repeater. Like this:
<asp:Repeater ID="rptEvaluationInfo" runat="server">
<ItemTemplate>
<asp:Label runat="server" Id="lblCampCode" Text="<%#Eval("CampCode") %>"></asp:Label>
<asp:CheckBox runat="server" ID="cbCoaching" value="coaching-required" ClientIDMode="AutoID" AutoPostBack="True" OnCheckedChanged="cbCoaching_OnCheckedChanged" />
</ItemTemplate>
</asp:Repeater>
When some one clicks on the checkbox I want to get that entire row in my code behind. So if a CheckedChanged happens I want to get the Text of the Label lblCampCode in code behind.
Is it possible?
I have managed to write this much code.
protected void cbCoaching_OnCheckedChanged(object sender, EventArgs e)
{
CheckBox chk = (CheckBox)sender;
Repeater rpt = (Repeater)chk.Parent.Parent;
string CampCode = "";// here i want to get the value of CampCode in that row
}
So you want to get the RepeaterItem? You do that by casting the NamingContainer of the CheckBox(the sender argument). Then you're almost there, you need FindControl for the label:
protected void cbCoaching_OnCheckedChanged(object sender, EventArgs e)
{
CheckBox chk = (CheckBox)sender;
RepeaterItem item = (RepeaterItem) chk.NamingContainer;
Label lblCampCode = (Label) item.FindControl("lblCampCode");
string CampCode = lblCampCode.Text;// here i want to get the value of CampCode in that row
}
This has the big advantage over Parent.Parent-approaches that it works even if you add other container controls like Panel or Table.
By the way, this works the similar way for any databound web-control in ASP.NET (like GridView etc).
By pressing button in GridView i need to find control in Listview.
<ItemTemplate>
<td>
<asp:Label ID="lblMarketLVBalanceHeader" runat="server" Text="Balance: "></asp:Label>
</td>
<td>
<asp:Label ID="lblMarketLVBalanceValue" runat="server" Text='<%# Bind("Money", "{0:####}$") %>'></asp:Label>
</td>
</ItemTemplate>
Code Behind:
protected void GVMarketItems_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.Equals("Buy"))
{ GridViewRow row = (GridViewRow)(((Button)e.CommandSource).NamingContainer);
/* string itemID = row.Cells[0].Text;
string itemName = row.Cells[1].Text;
string itemCostStr = row.Cells[3].Text; */
string curBalanceStr = ((Label)LVMarketBalanceShow.FindControl("lblMarketLVBalanceValue")).Text;
}
Code seems find, but i have "Object reference not set to an instance of an object" when i'm trying to Find control.
string curBalanceStr = ((Label)LVMarketBalanceShow.FindControl("lblMarketLVBalanceValue")).Text;
Did the same to DetailsView and it was Ok.. What's wrong with ListView?
UPD: Trying to get first fow of listview
ListViewDataItem curBalanceLV = LVMarketBalanceShow.Items[0];
string curBalanceStr =((Label)curBalanceLV.FindControl("lblMarketLVBalanceValue")).Text;
But getting an error "Index was out of range."
I think you want to find the control within the specific row.
string curBalanceStr = ((Label)row.FindControl("lblMarketLVBalanceValue")).Text
Did the same to DetailsView and it was Ok.. What's wrong with
ListView?
A DetailsView is used to tackle with one row at a time so you can directly call FindControl() on the detailsview but gridview and listview are meant to display multiple records and your markup you define inside <ItemTemplate /> is just a template for each row. You'll be able to find the controls that you define in the template inside of each row.
After doing a lot of research online I'm still stumped by this problem. I have a page that loads the names and count of categories into a drop down list. I only do this if !(Page.IsPostBack). When AutoPostBack fires the SelectedIndex = 0. I've tried several different things. Here is my code:
PAGE
<form id="AddAssignmentForm" runat="server">
<asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true" runat="server" />
<asp:UpdatePanel ID="CommentUpdate" runat="server">
<ContentTemplate>
Add Comment
<asp:DropDownList ID="ddlCategory" runat="server" Width="206" OnSelectedIndexChanged="ddlCategory_SelectedIndexChanged" AutoPostBack="true" />
<asp:TextBox ID="txtName" runat="server" Width="200" />
<asp:TextBox ID="txtAbbrv" runat="server" Width="200" />
<asp:TextBox ID="txtDescription" runat="server" Width="200" Height="90" TextMode="MultiLine" />
</ContentTemplate>
</asp:UpdatePanel>
</form>
Here is the back end code.
private void Page_Load(object sender, System.EventArgs e)
{
if (!Page.IsPostBack)
{
GetCategories();
}
}
public void GetCategories()
{
String strSql = #"SELECT Name, Total
FROM MyTable";
if (con.State == ConnectionState.Closed)
con.Open();
OleDbCommand cmdsql = new OleDbCommand(strSql, con);
OleDbDataReader cmdReader = cmdsql.ExecuteReader();
if (cmdReader.HasRows)
{
while (cmdReader.Read())
{
ddlCategory.Items.Add(new ListItem(cmdReader["Category_Name"].ToString(), cmdReader["Total"].ToString()));
}
ddlCategory.SelectedIndex = -1;
}
cmdReader.Close();
con.Close();
}
public void FillForm(int index)
{
ListItem item = ddlCategory.Items[index];
txtName.Text = item.Text + " " + (Convert.ToInt32(item.Value) + 1).ToString();
txtAbbrv.Text = item.Text.Substring(0, 1) + (Convert.ToInt32(item.Value) + 1).ToString();
}
public void ddlCategory_SelectedIndexChanged(Object sender, EventArgs e)
{
//When I break here SelectedIndex always = 1.
FillForm(ddlCategory.SelectedIndex);
}
I just want to be able to populate the form based on the selected index, but I can't seem to get the correct answer. Any help is appreciated.
Add AppendDataBoundItems="true" for dropdown list
I discovered the problem. The values being populated from my SQL statement contained values that repeated. For some reason this was causing the entire thing to malfunction in weird ways which made it so that every time I selected a ListItem the whole list would reset. By making sure no values repeated, the code started working perfectly. Thanks for everyone's help.
Make sure that your value fields are unique for each dropdown list item. If each item has the same value, it will default on index 0.
Do you have Viewstate enabled or disabled? SelectedIndex is Zero based, so it were resetting I think it would be set to zero.
Also, what do the other properties of the drop down list get set to? Is the selected value correct?
Try a different browser. I had an issue with cascading drop downs where it wasn't firing/behaving correctly in Firefox.
This happened to me when attempting to use a combined column value for the DataValueField. For example:
The stored procedure was written like this:
SELECT
Description,
Value1 + ',' + Value2 AS Value
FROM
DropDownListTable
And the DataValueField used the Value field which was a combination of the Value1 and Value2 fields separated by a comma. (I also tried a pipe and no delimiter but had the same results)
With ddl
.DataTextField = "Description"
.DataValueField = "Value"
.DataSource = ds
.DataBind()
End With
As soon as I used Value1 or Value2 as the DataValueField, the problem went away.
I struggled with this too, I tried EnableViewState="true" ViewStateMode="Enabled" but it's not needed in fact, you just have to addd IsPostBack in Page_Load event.
Do not forget to add IsPostBack, that is it...
if (!IsPostBack)
{
LoadDropDown();
}
You have to load list to DropDownList if not IsPostBack
Example code:
if (!IsPostBack)
{
//fill here
}
I've been experiencing the same problem, my dropdownlist stateview jump to index 1 right after a postback event from another control. My suggestion simply make sure your dropdownlist values are not empty.
Hope its help someone .... :)
I find my self having a repeater control which is being databound to an xml document. My client is now requesting that the Textbox's which are being repeater can be either a Textbox or a Checkbox.
I cannot seem to find an easyway to essentially do the following:
if ((System.Xml.XmlNode)e.Item.DataItem.Attributes["type"] == "text")
<asp:TextBox runat="server" ID="txtField" Text='<%#((System.Xml.XmlNode)Container.DataItem).InnerText %>' CssClass="std"></asp:TextBox>
else
<asp:CheckBox runat="server" ID="txtField" Text='<%#((System.Xml.XmlNode)Container.DataItem).InnerText %>' CssClass="std"></asp:TextBox>
Is there a nice way I can extend my current implementaion without have to rewrite the logic. If I could inject the control via "OnItemDataBound" that would also be fine. But I cannot seem to make it work
In your repeater, drop a Panel, then create an event handler for the repeater's data binding event and programmatically create the TextBox or CheckBox and add it as a child control of the Panel. You should be able to get the DataItem from the event args to get information like your "type" attribute or values to feed your Text properties or css information, etc.
I would go with mspmsp's sugestion. Here is a quick and dirty code as an example of it:
Place this in your aspx:
<asp:Repeater ID="myRepeater" runat="server" OnItemCreated="myRepeater_ItemCreated">
<ItemTemplate>
<asp:PlaceHolder ID="myPlaceHolder1" runat="server"></asp:PlaceHolder>
<br />
</ItemTemplate>
</asp:Repeater>
And this in your codebehind:
dim plh as placeholder
dim uc as usercontrol
protected sub myRepeater_ItemCreated(object sender, RepeaterItemEventArgs e)
if TypeOf e Is ListItemType.Item Or TypeOf e Is ListItemType.AlternatingItem Then
plh = ctype(e.item.findcontrol("myPlaceHolder1"), Placeholder)
uc = Page.LoadControl("~/usercontrols/myUserControl.ascx")
plh.controls.add(uc)
end if
end sub
What about something similar to this in your markup in each the textbox and checkbox controls?
Visible=<%= Eval("type").tostring() == "text") %>
If there is needed to add controls based on data then there can be used this approach:
<asp:Repeater ID="ItemsRepeater" runat="server" OnItemDataBound="ItemRepeater_ItemDataBound">
<itemtemplate>
<div>
<asp:PlaceHolder ID="ItemControlPlaceholder" runat="server"></asp:PlaceHolder>
</div>
</itemtemplate>
</asp:Repeater>
protected void ItemRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
var placeholder = e.Item.FindControl("ItemControlPlaceholder") as PlaceHolder;
var col = (ItemData)e.Item.DataItem;
placeholder.Controls.Add(new HiddenField { Value = col.Name });
placeholder.Controls.Add(CreateControl(col));
}