I have a LinkButton within my ItemTemplate of my ListView:
<asp:ListView ID="lvNotification" runat="server">
<ItemTemplate>
<asp:LinkButton runat="server" ID="lbReject" OnClick="Reject_Click" CommandArgument='<%# Eval("offerID") %>' Text="Reject" />
</ItemTemplate>
</asp:ListView>
Then in my code I have:
protected void Reject_Click(object sender, EventArgs e)
{
var lbreject = lvNotification.Items[0].FindControl("lbReject") as LinkButton;
string c = lbreject.CommandArgument;
}
The ListView retrieves 4 rows correctly, and I have placed the Eval("offerID") and it shows an offerID for each item in the list, however when I place it as the CommandArgument in the LinkButton and debug it, it shows the value 1 on ever item in the ListView, I am trying to place the offerID in each LinkButton CommandArgument and be able to access it, but I cannnot do so.
What am I doing wrong?
That is because you are always checking the first item (0 index). You can get the LinkButton from the sender and check its command argument.
protected void Reject_Click(object sender, EventArgs e)
{
var lbreject = (LinkButton)sender;
string c = lbreject.CommandArgument;
}
Here actually OnItemCommand event of ListView can be handy. This way you can control all events from the single point:
<asp:ListView ID="lvNotification" OnItemCommand="lvNotification_OnItemCommand" runat="server">
<ItemTemplate>
<asp:LinkButton runat="server" ID="lbReject" CommandName="Reject_Click" CommandArgument='<%# Eval("offerID") %>' Text="Reject" />
</ItemTemplate>
</asp:ListView>
protected void lvNotification_OnItemCommand(object sender, ListViewCommandEventArgs e)
{
if (String.Equals(e.CommandName, "Reject_Click"))//or any other event
{
LinkButton lbreject = (LinkButton) sender;
string c = lbreject.CommandArgument;
}
}
Related
While getting the value I'm getting Object reference not set to an instance of an object. how to get labeled label value in code behind. How to get the value in custom event
<asp:GridView runat="server" ID="gridviewQuoteDetails" EmptyDataText="No records Found..." AutoGenerateEditButton="false" OnRowEditing="gridviewQuoteDetails_RowEditing" OnRowUpdating="gridviewQuoteDetails_RowUpdating" DataKeyNames="id" AutoGenerateColumns="false">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<a href='Quote.aspx?val=<%#Eval("id")%>'>
<asp:Label ID="lblid" runat="server" Text='<%#Eval ("id")%>'></asp:Label>
</a>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" Text="Edit" runat="server" CommandName="Edit" />
</ItemTemplate>
<EditItemTemplate>
<asp:LinkButton ID="LinkButton2" Text="Update" runat="server" OnClick="OnUpdate" />
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
code behind
protected void OnUpdate(object sender, EventArgs e)
{
string qouteid = ((Label)gridviewQuoteDetails.FindControl("lblid")).Text;
GridViewRow row = (sender as LinkButton).NamingContainer as GridViewRow;
string id = (row.Cells[0].Controls[0] as TextBox).Text;
string Description = (row.Cells[1].Controls[0] as TextBox).Text;
}
Gridview is a collection of rows right, but you are trying to search the control directly within the gridview thus ((LinkButton)gridviewQuoteDetails.FindControl("lbllnknm")) will be null and when you are trying to access the Text property of LinkButton you are getting NRE error.
You need to loop through the rows of your gridview control to access each linkbutton present in each row like this:-
foreach (GridViewRow row in gridviewQuoteDetails.Rows)
{
LinkButton lbllnknm= row.FindControl("lbllnknm") as LinkButton;
}
But ideally you would not be needing this. I guess you are trying to get the value in OnRowEditing event handler. If that is the case then you can fetch the value of linkbutton like this:-
protected void gridviewQuoteDetails_RowEditing(object sender, GridViewUpdateEventArgs e)
{
string qouteid = ((Label)gridviewQuoteDetails.Rows[e.NewEditIndex]
.FindControl("lbllnknm")).Text;
}
Update 2:
As per your comment you are trying to access the LinkButton text on click of LinkButton itself which means the event is raised by LinkButton itself. You can simply use the sender object like this:-
protected void OnUpdate(object sender, EventArgs e)
{
LinkButton LinkButton2 = sender as LinkButton;
GridViewRow row = LinkButton2.NamingContainer as GridViewRow; //Get the gridview row
Label lblid = row.FindControl("lblid") as Label;
string qouteid = lblid.Text;
}
I have a button like this in my gridview,
<asp:LinkButton runat="server" ID="lnkCustDetails" Text='<%# Eval("CustomerID") %>' OnClick="lnkCustDetails_Click" />
and I get the id like this:
protected void lnkCustDetails_Click(object sender, EventArgs e)
{
LinkButton lb = sender as LinkButton;
string custID = lb.Text;
lblCustValue.Text = custID;
ModalPopupExtender1.Show();
}
My problem is, what can I use instead of having the id in Text='<%# Eval("CustomerID") %>' because this displays the id of the customer in the linbutton, when I want the link button to display "Details"
You can switch to handling commands instead of clicks:
<asp:LinkButton runat="server" ID="lnkCustDetails"
Text='Details'
CommandArgument='<%# Eval("CustomerID") %>'
OnCommand="lnkCustDetails_Click" />
And to get the id:
protected void lnkCustDetails_Click(object sender, EventArgs e)
{
LinkButton lb = sender as LinkButton;
string custID = lb.CommandArgument;
lblCustValue.Text = custID;
ModalPopupExtender1.Show();
}
One note though: I am not sure if you can handle LinkButton's command directly if it lives inside the grid view. You might need to subscribe to grid view's On Command instead - please check.
I have page with listview in it. There is label and dropdownlist in listview. I would like to access the text of label from ddlTags_Init() method.
Code:
<asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1"
DataKeyNames="id_Image" onitemdatabound="ListView1_ItemDataBound">
<ItemTemplate>
<asp:Label ID="TagsLabel" runat="server" Text='<%# Eval("Tags") %>' />
<asp:DropDownList ID="ddlTags" runat="server" OnInit="ddlTags_Init" >
</asp:DropDownList>
</ItemTemplate>
</asp:ListView>
Code behind:
protected void ddlTags_Init(object sender, EventArgs e)
{
DropDownList ddlTags = (DropDownList)sender;
Label lblTag = (Label)ddlTags.Parent.FindControl("TagsLabel");
string text=lblTag.Text;
}
At the moment i am stuck with
Label lblTag = (Label)ddlTags.Parent.FindControl("TagsLabel");
Anyone knows what am i missing?
Thanks, Jim
Assuming that there are more than 1 elements in the listview datasource, why don't you put your code in the ItemDataBound handler? I think that it should work.
Init is too early to get the bind value of Label. In other words, label value hasn't been bind yet.
Instead you might want to consider using ItemDataBound method.
<asp:ListView ID="ListView1" runat="server"
OnItemDataBound="ListView1_ItemDataBound" ...>
....
</asp:ListView>
protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
if (e.Item.ItemType == ListViewItemType.DataItem)
{
var ddlTags = e.Item.FindControl("ddlTags") as DropDownList;
var tagsLabel = e.Item.FindControl("TagsLabel") as Label;
}
}
In my aspx page, I have,
<asp:ListView ID="listview1" runat="server" DataSourceID="dtasrc_load">
<ItemTemplate>
<h4>
<asp:Label ID="lbl_titlename" runat="server" Text='<%#Eval("abt_vch_Title") %>'></asp:Label>
</h4>
<asp:LinkButton runat="server" OnClick="Content_Load" class="btn">Edit</asp:LinkButton>
<asp:HiddenField ID="hiddenID" runat="server" Value='<%#Eval("abt_int_ID") %>' />
</ItemTemplate>
</asp:ListView>
I need to access the value in the hidden field control so that I can pass that value to the database on the linkbutton click event. Below is where I've gotten so far.
protected void Content_Load(object sender, EventArgs e)
{
HiddenField hd = new HiddenField();
HiddenField myhiddenfield = new HiddenField();
myhiddenfield = (HiddenField)listview1.FindControl("hiddenID");
int myID = Convert.ToInt32(myhiddenfield.Value);
I get a run-time error as "Object not referenced to instance of an object". The value seems to be null.
Can anyone tell me why I am getting this? What should I do?
give your linkbutton an id
<asp:LinkButton runat="server" OnClick="Content_Load" class="btn"
id="editlinkbutton">Edit</asp:LinkButton>
and change your code to this
protected void Content_Load(object sender, EventArgs e)
{
LinkButton editlinkbutton = sender as LinkButton;
HiddenField myhiddenfield = editlinkbutton.NamingContainer.FindControl("hiddenID") as HiddenField;
int myID = Convert.ToInt32(myhiddenfield.Value);
}
edit: maybe linkbutton doesnt have to have an id, not sure. my linkbuttons usually have id's :)
I recently had a similar issue. Try not to look for System.Web.UI.WebControls.HiddenField, but rather for System.Web.UI.HtmlControls.HtmlInputHidden-class, here.
Additionally, you should be more cautious, rather use
System.Web.UI.HtmlControls.HtmlInputHidden hi =
listview1.FindControl("hiddenID") as ystem.Web.UI.HtmlControls.HtmlInputHidden;
if(hi != null)
...
I put a hyperlink inside a datalist..
<ItemTemplate>
<asp:HyperLink ID="HyperLink1" runat="server">'<%# Eval("ThreadTitle") %>'</asp:HyperLink>
<br />
<br />
</ItemTemplate>
I want it to enable it to be pressed so that the datalist event will be triggered and transfer me to another page:
protected void DataList1_SelectedIndexChanged(object sender, EventArgs e)
{
Server.Transfer("AnswerQuestion.aspx?x=" + DataList1.DataKeyField + "&question=" + DataList1.SelectedValue + "&time=" + DateTime.Now);
}
Unfortunately, the link seems to be disabled and I cant press on it to trigger the DataList Selected event..
How can I make the hyperlink active ?
If you want to trigger a selecteditemchaned event use a LinkButton instead of hyperlink.
<asp:DataList ID="DataList1" runat="server"
onselectedindexchanged="DataList1_SelectedIndexChanged">
<ItemTemplate>
<asp:LinkButton ID="sjdj" runat="server" CommandName="Select">
<%# Container.DataItem %></asp:LinkButton>
</ItemTemplate>
</asp:DataList>
In the code behind have
protected void DataList1_SelectedIndexChanged(object sender, EventArgs e)
{
Server.Transfer("~/jjtestjj.aspx?" + DataList1.DataKeyField);
}
why arent you using the Hyperlink as a hyperlink?
You can set the NavigationURL and Text using the OnItemDataBound (or equivalent) event.
this code works with an asp:Repeater:
protected void Row_DataItem(object row, RepeaterItemEventArgs args)
{
if (args.Item.ItemType == ListItemType.AlternatingItem || args.Item.ItemType == ListItemType.Item)
{
var item = (DataItemPOCO)args.Item.DataItem;
var link = (HyperLink)args.Item.FindControl("HyperLink1");
link.Text = item.LinkText;
link.NavigateUrl = item.URL;
}
}