I have a form that has TabControl with Dynamic TabPages in it. Each pages has usercontrol added using a loop. This is how I add the usercontrol in each pages.
for (var i = 0; i < tbl.Rows.Count; i++)
{
uctrTab = new XtraTabPagesUserCtrl();
xtab.TabPages[i].Text = "Table " + (i+1);
uctrTab.LayoutClicked += new MouseEventHandler(Layout_Click);
xtab.TabPages[i].Controls.Add(uctrTab);
xtab.TabPages[i].PageVisible = !xtab.TabPages[i].PageVisible;
}
The usercontrol I made has a DataGridView in it so i want to refresh the content of it but I dont know how to do that without removing and readding the control back.
right now my solution is
xtab.SelectedTabPage.Controls.Clear();
uctrTab = new XtraTabPagesUserCtrl();
uctrTab.LayoutClicked += new MouseEventHandler(Layout_Click);
xtab.SelectedTabPage.Controls.Add(uctrTab);
is there any better way of refreshing the content without having to do that?
I'm going to write my answer here (I did it in the comments section because question was on hold).
My suggestion.. first implement a method in your user control like..
public void RefreshGrid()
{
refresh datagridview data here
}
Second, itearate over selected tab page's controls and look for your usercontrol.. something like this..
foreach(Control ctrl in selectedTabPage.Controls)
{
if(ctrl is XtraTabPagesUserCtrl)
{
((XtraTabPagesUserCtrl)ctrl).RefreshGrid();
}
}
Related
I have a user control (ucMarket) which contains (for the purpose of simplicity) two controls: a ListBox (ucListBox) and a Label (ucLabel). I need to create multiple instances of that user control on the page dynamically (depending on the results from a DataSet), and I add them using a foreach statement and the following:
Panel1.Controls.Add(ucMarket1);
But how do I get access to the ListBox properties like Rows ? The only thing I have found so far is to cast the control as a ListBox:
ListBox listBox1 = (ListBox)ucMarket1.FindControl("ucListBox");
listBox1.Rows = 10;
For the Label part, I guess I can also do something similar:
label1 = (Label)ucMarket1.FindControl("ucLabel");
But then, how do I put that information back into the user control ? Is there a way to work directly with the user control instead of casting ?
Ok a couple of things. from a naming convention point of view, don't call the label & listbox, ucSOMETHING. This is very confusing and not clear from your example whether you're referring to the asp:Label control or some custom userControl you've written. As for accessing your controls.
I'm assuming you are creating and adding a bunch of user controls in the following manner.
for(int i = 0; i < 5; i++)
{
var control = Page.LoadControl("~/Path/To/ucMarket.ascx");
control.Id = "ucMarket" + i;
Panel1.Controls.Add(control);
}
So your best bet is to expose the Listbox on your Control as a public property.
public class ucMarket : UserControl
{
public ListBox TheListBox
{
get { return ucListBox; }
}
}
That way you could access your listbox in the following way.
var ctrl = Panel1.FindControl("ucMarket1") as ucMarket;
ctrl.TheListBox.Rows ;
Some inits done earlier in the code...
private List<System.Windows.Forms.TabPage> tab_pages = new List<System.Windows.Forms.TabPage>();
int tab_increment = 0;
Somewhere in the code, I create a bunch of tab pages in real-time.
for (i=0; i<5; i++)
{
tab_pages.Add( new System.Windows.Forms.TabPage() );
tab_pages[tab_increment].Location = new System.Drawing.Point(4, 22);
tab_pages[tab_increment].Name = 1 + tab_increment.ToString();
tab_pages[tab_increment].Size = new System.Drawing.Size(501, 281);
tab_pages[tab_increment].Text = tab_increment.ToString();
this.tabControl.Controls.Add(tab_pages[tab_increment]);
tab_increment += 1;
}
Now I would like to access elements that are these tab pages. Also let's pretend that I created different elements on each page (example, tabPage[0] a button, tabPage[1] a checkbox, etc), how do I access them knowing that everything was added dynamically?
Check this approach:
void Walk(Control control)
{
foreach (Control c in control.Controls)
{
//just walking through controls...
//...do something
//but remember, it could contain containers itself (say, groupbox or panel, etc.)...so, do a recursion
if (c.Controls.Count > 0)
Walk(c);
}
//or
foreach (Button btn in control.Controls.OfType<Button>())
{
//an example of how to walk through controls sub array of certain type
//this loop won't have a single iteration if this page contains no Buttons
//..so you can replace Button
//and have some certain code for different types of controls
}
}
And launch it for tabcontrol:
foreach (TabPage page in tabControl1.TabPages)
Walk(page);
I guess there is no special need to have separate collection of tabpages for one tabcontrol, as soon as it has TabPages property.
In the code above I used Enumerable.OfType Method to get a subcollection of controls of certain type.
As for your code, try this:
for (int i = 0; i < 5; i++)
{
this.tabControl.Controls.Add(new System.Windows.Forms.TabPage());
this.tabControl.TabPages[i].Text = i.ToString();
//...do whatever you need
//...
//besdies, I think, ther's no need in tab_increment...loop index works well enough
}
In order to add pages, I think that using
tabControl.TabPages.Add(new TabPage("Name"));
or in your case
this.tabControl.TabPages.Add(tab_pages[tab_increment]);
is more suitable.
In order to access them you could use
TabPage tp = tabControl.TabPages[i]; //where i is the index of your TabPage
and you can use TabPage.Controls.Add of the Controls property to add any Control on the TabPage like:
Button btn = new Button();
btn.Name = "Button name";
tp.Controls.Add(btn);
You can use the Controls property on the TabPage object. Each control in the collection is given to you as a Control, and it is up to you to cast them to the type that you want.
On one web user control
public void displayFindingSection(int sectionsid,string text,string head)
{
SectionHeading.Text = head;
DataSet totImgs;
totImgs = objGetBaseCase.GetFindingsNewerImages(sectionsid);
FindingViewerlist.DataSource = totImgs;
DataBind();
SectionText.Text = text;
}
On other web user control
public void DisplayFindingsViewer(CipCaseWorkflowItem2 item)
{
FindingViewerDisplay.Visible = true;
ImageAndSimpleViewer.Visible = false;
objGetBaseCase.GetFindingsImages((Convert.ToInt32(Session["CaseId"])), item.ItemId);
FindingsViewerNew = objGetBaseCase.GetFindingViewerNewElementDetails(item.ItemId);
for (int i = 0; i < FindingsViewerNew.Count; i++)
{
FindingViwerDisplay uc = (FindingViwerDisplay)LoadControl("FindingViwerDisplay.ascx");
FindingPlaceholder.Controls.Add(uc);
uc.displayFindingSection(Convert.ToInt32(FindingsViewerNew[i].Index), FindingsViewerNew[i].Text, FindingsViewerNew[i].Title);
}
}
I am adding the all the image in user control and displaying the image, but when i am using the above code, web user control is also adding every time and one image is showing in in control what i want is all images should show in only one user control.. sectionsid is getting the image id from the database. I think prob with for loop but i am unable to solve it.. help me it that
Might be it is happening u have defined it inside the loop
FindingViwerDisplay uc = (FindingViwerDisplay)LoadControl("FindingViwerDisplay.ascx");
FindingPlaceholder.Controls.Add(uc);
On Each loop you are adding uc and calling displayFindingSection whcich ofcouse add 1 image than loop go back add a new control again and than add one image it will go on till your loop completion so add control once before loop and call just displayFindingSection in loop..
Do this,
FindingViwerDisplay uc = (FindingViwerDisplay)LoadControl("FindingViwerDisplay.ascx");
FindingPlaceholder.Controls.Add(uc);
//define here a dataTabel with three columns let say u have datatable dt
for (int i = 0; i < FindingsViewerNew.Count; i++)
{
dt.Rows.Add(Convert.ToInt32(FindingsViewerNew[i].Index), FindingsViewerNew[i].Text, FindingsViewerNew[i].Title);
}
uc.displayFindingSection(dt);
Then work out on that dt in displayFindingSection
Sorry if i am wrong...
i'm having issues retreiving the values out of a dynamically created dropdownlist. all controls are created in the Page_Init section. the listitems are added at that time as well from an array of listitems. (the controls are named the same so should be accessable to the viewstate for appropriate setting.)
here is the function that attempts to retrieve the values:
protected void Eng98AssignmentComplete_Click(object sender, EventArgs e)
{
String myID = "0";
Page page = Page;
Control postbackControlInstance = null;
// handle the Button control postbacks
for (int i = 0; i < page.Request.Form.Keys.Count; i++)
{
postbackControlInstance = page.FindControl(page.Request.Form.Keys[i]);
//Response.Write(page.Request.Form.Keys[i].ToString());
if (postbackControlInstance is System.Web.UI.WebControls.Button)
{
myID = Convert.ToString(
postbackControlInstance.ID.Replace("button_", ""));
}
}
String txtholder = "ctl00$ContentPlaceHolder$Eng098Instructors_" + myID;
Response.Write("MYID: " + myID + "<br/>");
DropDownList ddInstructorCheck = (DropDownList)Page.FindControl(txtholder);
Response.Write("Instructor Selected: "
+ ddInstructorCheck.SelectedValue + "<br/>");
}
here is the output I get, no matter which instructor was selected.....
MYID: 1_1
Instructor Selected: 0
ctl00$ContentPlaceHolder$Eng098Instructors_1_1
the name of the control is correct (verified via view source)....
ideas?
You're going to a lot of work to build this fancy string:
ctl00$ContentPlaceHolder$Eng098Instructors_1_1
That is the client ID of your control, not the server id. This code is running on the server side, and so you need the server id. To get that control using the server id, you need to do this:
ContentPlaceHolder.FindControl("Eng08Instructors_1_1");
Notice I didn't look in the page, because your content place holder created a new naming container.
Also, the way your loop is set up the myID variable will always end up holding the last button in the Keys collection. Why even bother with the loop?
Based on your comments, a better way to find the id of the dropdownlist is like this:
string id = ((Control)sender).ID.Replace("button_", "Eng098Instructors_");
why not just save the control in an instance in your class so that you don't have to use FindControl?
Do you also re-create the controls during the postback? Dynamically generated/added controls must be re-created with every request, they are not automatically re-created.
Why don't you cast the sender? This should be the button that caused the postback:
string myId = "0";
Button btn = sender as Button;
if (btn != null)
myId = btn.ID
...
You need to perform something like this because the UniqueID property is the key in Request.Form.
List<Button> buttons = new List<Button>();
List<DropDownList> dropdowns = new List<DropDownList>();
foreach (Control c in Controls)
{
Button b = (c as Button);
if (b != null)
{
buttons.Add(b);
}
DropDownList d = (c as DropDownList);
if (d != null)
{
dropdowns.Add(d);
}
}
foreach (String key in Request.Form.Keys)
{
foreach (Button b in buttons)
{
if (b.UniqueID == key)
{
String id = b.ID.Replace("button_", "");
String unique_id = "ctl00$ContentPlaceHolder$Eng098Instructors_" + id;
Response.Write("MYID: " + id + "<br/>");
foreach (DropDownList d in dropdowns)
{
if (d.UniqueID == unique_id)
{
Response.Write("Instructor Selected: " + d.SelectedValue + "<br/>");
break;
}
}
}
}
}
I'm not sure why you are generating the control in code (you can still add items dynamically if you do), but the code that generates the controls would probably be a huge help here. I'm guessing you are not setting the list item value, and instead just setting the list item text. Try seeing what you get from the SelectedText field and post your control creation function.
EDIT:
In response to your comment on #Martin's post, you said "yes I recreate the controls in the Page_Init function each time the page is created (initial or postback)". Are you also setting the selected value when you create them?
You can also use controls on the page even if your data comes from a database, the controls themselves don't have to be dynamically generated.
How about this?
((Button)sender).Parent.FindControl(myid)
Edit:I misunderstood your question. But i think you should follow page lifecycle. it is common issue for dynamically created controls.
I did some research and here is some info about Dynamically Created Controls may help you...
I had 2 catches.... here's what they were.
1. I didn't clear the table I was adding to before re-creating the controls.
apparently my attention to detail was off yesterday, i'm pretty sure the ctlXX frontrunner of the control was some different number upon postback due to how I was recreating the controls.
2. I was assigning the same list to all the dropdownlist controls.
once I called the lookup upon each creation a dropdownlist control, all works well.
anyway for what it's worth....
I have an UpdatePanel and in it a regular Panel. In the Panel I dynamically add simple UserControls. The Usercontrol has a Button and a Label. When I click on a button in a control it removes all controls in the Panel which I have added dynamically.
Can anyone help?
int controlID = 0;
List<Control> cc = new List<Control>();
if (Session["ControlsCompleted"] != null)
{
cc = Session["ControlsCompleted"] as List<Control>;
for (int i = 0; i < cc.Count; i++)
{
pnlCompletedEducation.Controls.Add(cc[i]);
}
controlID = cc.Count;
}
Controls_TestWebUserControl ct = LoadControl(#"Controls\TestWebUserControl.ascx") as Controls_TestWebUserControl;
ct.ID = controlID.ToString();
cc.Add(ct);
ct.EnableViewState = true;
pnlCompletedEducation.Controls.Add(ct);
txtInstitutionName.Text = controlID.ToString();
List<Control> lc = new List<Control>();
for (int i = 0; i < pnlCompletedEducation.Controls.Count; i++)
{
lc.Add(pnlCompletedEducation.Controls[i]);
}
Session["ControlsCompleted"] = lc;
This is how I add the controls to the panel. I had to keep them somewhere, and i couldn't do it with the ViewState, so i used a Session, which is a bad idea.
You say that you are adding the user control dynamically. Are you having code like this:
void Page_Load(...)
{
if (!IsPostback)
// AddUserControl here.
}
You need to add the user control during every request, also postbacks, because it will not be stored in the view state that you have modified the control tree.
You problem that you have not recreated (for example at Page_Load) dynamically added control.
Make sure that control is recreated on IsPostBack