I want dynamic hyperlink on each field in a table column from code behind in asp.net, I implement it thus:
table.Append("<td><asp:HyperLink ID='HyperLink1' NavigateUrl='#' runat='server'>" + (string)strNAME + "</asp:HyperLink></td>");
on the field but when I run it there is no link to click. it is not effective. what is the correct way of implementing it?
You need to approach this in a different way. Server side controls cannot be added as string literals, they should be objects. So what you can do is either add it as a server side control:
HyperLink hl = new HyperLink();
hl.ID = "HyperLink1";
hl.NavigateUrl = "#";
hl.Text = (string)strNAME;
TableCell tc = new TableCell();
tc.Controls.Add(hl);
table.Controls.Add(tc);
Or add it as a client side link:
table.Append("<td><a href='#'>" + (string)strNAME + "</a></td>");
Side note: adding table cell to "table" kind of does not make sense because there supposed to be a row, not a table, but I just left your code as is, adjust as needed.
Creating hyperlink from code-behind
HyperLink hlnk = new HyperLink();
hlnk.InnerText = (string)strNAME;
hlnk.ID = "HyperLink1";
hlnk.NavigateUrl = "/test.aspx";
table.Controls.Add(hlnk);
hope it helps
Related
i'm using grid control in DevExpress reports when i set data source dynamically to my grid control its not showing a output, anyone please help me to get.
this is my code
DataTable dtJobOrder = new DataTable();
string DTQuery = #"Select Product from JobOrder";
dtJobOrder = Generic.GetDataTable(DTQuery);
grdspare.DataSource = dtJobOrder;
Probably you already found a way.
You can achieve this by calling PopulateColumns method on grid view.
When you are dynamically set the data source to gridview then you have to set AutoGeneratedColumns to true.
AutoGeneratedColumns = true
in asp.net TextBox will create pressure to button1's. Button2 to the pressure inside the TextBox data consisting of label1 my yazdırıca. I tried to do it like this gives an error.
Object reference not set to an instance of an object.
button1_click{
TextBox txt = new TextBox();
txt.ID = "a";
txt.EnableViewState = true;
Panel1.Controls.Add(txt);
}
Button2_click{
TextBox deneme= Panel1.FindControl("a") as TextBox;
Label1.Text = deneme.Text;
}
After you create your control, on the first click, the control shown on the page and exist.
On the second click the page is not know any more about that text control because you did not save that information somewhere and because only you know that some time in the past you create it.
So on this code you have:
Button2_click{
TextBox deneme= Panel1.FindControl("a") as TextBox;
// here the deneme is null ! and you get the exception !
// the deneme is not exist on the second click, not saved anywhere
Label1.Text = deneme.Text;
}
The solution is to keep on viewstate what control you create and how, and re-create them on PageInit. Alternative you can redesign your page and think a different approach to that, eg you can have the TextControl's all ready on page hidden, and just open them.
Button2_click{
TextBox txt = (TextBox)Panel1.FindControl("a");
Label Label1 = new Label();
Label1.Text=txt.Texxt;
}
I have a web form but I have to do this by code since I dont know the number of hyperlinks I need from the beginning.
How can I add some hyperlinks with Image in a label, the number of hyperlink depends on the number of rows of a query, and each row give me the link information to navigate.
Thanks in advance.
As you loop through your data you can manually add a link to the row something like this:
For i As Integer = 0 To 10
Dim row As New HtmlTableRow
row.Cells.Add(New HtmlTableCell)
Dim Link As New HyperLink
Link.Text = "WhateverText"
Link.NavigateUrl = "page.aspx"
Link.ImageUrl = "~/Theme/Images/SomeImage.gif"
Link.ToolTip = "ToolTipText"
row.Cells(0).Controls.Add(Link)
Next
That of course adds the link as the first cell in an html table. Not sure how you plan to display your data.
In response to the comment below. You can instead insert the new cell something like this
For i As Integer = 0 To 10
Dim row As New HtmlTableRow
Dim cell As New HtmlTableCell
row.Cells.Insert(1, cell)
Dim Link As New HyperLink
Link.Text = "WhateverText"
Link.NavigateUrl = "page.aspx"
Link.ImageUrl = "~/Theme/Images/SomeImage.gif"
Link.ToolTip = "ToolTipText"
row.Cells(0).Controls.Add(Link)
Next
You could also simply add the control to the existing cell that the label is in instead of making a new cell. You can do that by the index value of your existing cell (starting at 0 for each cell that is in the row)
This question is similar to what you want to do:
Auto increment asp control ID
Two options either use a repeater or dynamically add the controls to a panel or some other container control.
I have an ASP project which references a WCF service. Does exactly half of what I need.
A button on the page calls a function from the WCF, which returns a list of objects (variable names). When returned, the vb code dynamically adds textboxes to a panel on the page. Like this:
For Each LetterVariables In LetterVarList
tb = New TextBox
lb = New Label
lb.Text = LetterVariables._key & " "
tb.ID = LetterVariables._key
pnlVars.Controls.Add(lb)
pnlVars.Controls.Add(tb)
Dim LineBreak As LiteralControl = New LiteralControl("<br />")
pnlVars.Controls.Add(LineBreak)
Next
Now the problem is, after this is finished the user will enter some values into those texboxes. I (somehow) need to reference those texboxes to snag the values when a user clicks another button.
How can I do this?
Thanks,
Jason
You can give the TextBox an ID which you could use FindControl to retrieve.
tb.ID = "txt" + LetterVariables._key.ToString();
Then when you want to reference it.
TextBox txtBox = (TextBox)FindControl("txt" + someKey);
Something like that might work for you.
Don't forget to recreate the controls on post back BEFORE the controls are loaded with the posted values.
I have a folowing problem:
I have a page where I need to create a lot of elements dynamically from the code behind. It obviously depends on what is passed from the database, but the number of elements can change, that's why I cannot do it static.
What I have at the moment, is:
I have statically created PANEL:
<asp:Panel ID="pFullInfo_lStartDateStr" runat="server"></asp:Panel>
Then in Code Behind, I'm creating other Controls and add them to my Label. The Issue I have is that the CalendarExtender that should appear after clicking the iEditStartDateCalendar doesn't popup :( I can't see what I'm doing wrong here ? Any help please ?!?!
// StartDate
Label lStartDateSite = new Label();
pFullInfo_lStartDateStr.Controls.Add(lStartDateSite);
Label lStartDate = new Label();
pFullInfo_lStartDateStr.Controls.Add(lStartDate);
ImageButton ibEditStartDate = new ImageButton();
ibEditStartDate.ID = "ibEditStartDate_" + this_site_id;
pFullInfo_lStartDateStr.Controls.Add(ibEditStartDate);
TextBox tbEditStartDate = new TextBox();
pFullInfo_lStartDateStr.Controls.Add(tbEditStartDate);
Image iEditStartDateCalendar = new Image();
iEditStartDateCalendar.ID = "iEditStartDateCalendar";
iEditStartDateCalendar.ImageUrl = "~/i/small/calendar.png";
iEditStartDateCalendar.ImageAlign = ImageAlign.AbsMiddle;
pFullInfo_lStartDateStr.Controls.Add(iEditStartDateCalendar);
CalendarExtender ceEditStartDate = new CalendarExtender();
ceEditStartDate.ID = "ceEditStartDate_" + this_site_id;
ceEditStartDate.PopupButtonID = iEditStartDateCalendar.UniqueID;
ceEditStartDate.TargetControlID = tbEditStartDate.UniqueID;
ceEditStartDate.PopupPosition = CalendarPosition.Right;
pFullInfo_lStartDateStr.Controls.Add(ceEditStartDate);
Normally, when adding the calendar extender in markup, you'd just set the PopupButtonID and TargetControlID to the ID of those controls, not the UniqueID.
When adding things like Labels dynamically, you set the AssociatedControlID to the ID of the control, not the UniqueID/ClientID and the framework works it out at render time.
Also, most JavaScript libraries prefer you to use the actual id of the control, rather than the name attribute, so you should use ClientID instead.
I found the solution.
The problem was with the "UniqueID" I was passing.
The correct solution is here:
// StartDate
Label lStartDateSite = new Label();
pFullInfo_lStartDateStr.Controls.Add(lStartDateSite);
Label lStartDate = new Label();
pFullInfo_lStartDateStr.Controls.Add(lStartDate);
ImageButton ibEditStartDate = new ImageButton();
ibEditStartDate.ID = "ibEditStartDate_" + this_site_id;
pFullInfo_lStartDateStr.Controls.Add(ibEditStartDate);
TextBox tbEditStartDate = new TextBox();
pFullInfo_lStartDateStr.Controls.Add(tbEditStartDate);
tbEditStartDate.ID = "tbEditStartDate_" + this_site_id;
Image iEditStartDateCalendar = new Image();
iEditStartDateCalendar.ID = "iEditStartDateCalendar";
iEditStartDateCalendar.ImageUrl = "~/i/small/calendar.png";
iEditStartDateCalendar.ImageAlign = ImageAlign.AbsMiddle;
pFullInfo_lStartDateStr.Controls.Add(iEditStartDateCalendar);
CalendarExtender ceEditStartDate = new CalendarExtender();
ceEditStartDate.ID = "ceEditStartDate_" + this_site_id;
ceEditStartDate.PopupButtonID = iEditStartDateCalendar.ID;
ceEditStartDate.TargetControlID = tbEditStartDate.ID;
ceEditStartDate.PopupPosition = CalendarPosition.Right;
pFullInfo_lStartDateStr.Controls.Add(ceEditStartDate);
So what I did basicaly, I assigned an ID's to the TextBox and Image which are been used for the calendar, and that worked :]
Many thanks to Stack Overflow :]