Delphi: Adding Combobox Dropdown to TADVStringGrid - delphi

I have a form that has a TADVStringGrid. I am trying to add a combobox to some rows in a specific column (2); however, I can't get the data to show on the dropdown. I added the HasComboBox event, I set the DirectComboDrop, and it still did not show any data in the dropdown. They were just empty. I check the object that I am adding to the dropdown, and they had data. What am I missing here?
procedure UserForm.DisplayGrid(Sender: TObject);
var
J : Integer;
begin
... additional logic
...
if OutputList.Count > 2 then
begin
with UserGrid.Combobox do
begin
for J := 0 to OutputList.Count - 1 do
BEGIN
if not(OutputList[J] = '') then
begin
dValue := DropDownValue.Create;
dValue.ID := J + 1;
dvalue.Name := OutputList[J];
dvalue.TestValue := OutputList[J] + 'testvalue'; // where value will be a list to choose from
ListOfTest.Add(dValue); // this is a glabal variable where I for later reference
ItemIndex := dValue.ID;
end;
END;
end;
end;
//event
procedure UserForm.UserGridHasComboBox(Sender: TObject; ACol, ARow: Integer;
var HasComboBox: Boolean);
begin
HasComboBox := True;
end;

There is an event handle called EditorProp that needed to be added. Data that need to be added for a specific column have to be added when the EditorProp event is called. The piece of code below was moved into the editorprop event, and it's working fine since.
for J := 0 to OutputList.Count - 1 do
BEGIN
if not(OutputList[J] = '') then
begin
dValue := DropDownValue.Create;
dValue.ID := J + 1;
dvalue.Name := OutputList[J];
dvalue.TestValue := OutputList[J] + 'testvalue'; // where value will be a list to choose from
ListOfTest.Add(dValue); // this is a glabal variable where I for later reference
ItemIndex := dValue.ID;
end;

Related

Updating field in cxGrid acting strange

I have a function to update a cxGrid made with help from answers to Loop through records on a cxgrid and update a field/column
But it is sometimes acting a bit strange. If I open the form with the cxGrid and click the columnheader without doing anything else, the records are updateted OK. But if the 'selectorbar' is moved away from the top, the record marked is not updated.
I am sure it is a property that needs to be changed, but which one.
The variable fSelected is set to False at FormShow and is ther so that the user can unselect records as well.
procedure TfrmContactsSelect.colContactSelectedHeaderClick(Sender: TObject);
var
i: Integer;
Index: Integer;
BookMark : TBookMark;
Contact: variant;
begin
if fMulti = True then
begin
Screen.Cursor := crHourGlass;
fSelected := not fSelected;
BookMark := qryContacts.GetBookmark;
qryContacts.DisableControls;
try
for i := 0 to grdContactsView1.DataController.FilteredRecordCount - 1 do
begin
Index := grdContactsView1.DataController.FilteredRecordIndex[i];
Contact := grdContactsView1.DataController.Values[Index, 4];
if grdContactsView1.DataController.LocateByKey(Contact) then
begin
qryContacts.Edit;
qryContacts.FieldByName('fldcontact_selected').AsBoolean := fSelected;
qryContacts.Post;
end;
end;
finally
qryContacts.EnableControls;
qryContacts.GotoBookmark(BookMark);
qryContacts.FreeBookmark(BookMark);
end;
Screen.Cursor := crDefault;
end;
end;
Delphi XE7, DevExpress 14.2.2, UniDAC 5.5.12 for DB access
Comment:
I have ended up with the following solution based on the answer and input from MartynA
procedure TfrmContactsSelect.colContactSelectedHeaderClick(Sender: TObject);
var
i: Integer;
Index: Integer;
MarkedRecord: variant;
CurrentRecord: variant;
begin
if fMulti = True then
begin
Screen.Cursor := crHourGlass;
fSelected := not fSelected;
Index := grdContactsView1.DataController.FocusedRecordIndex;
MarkedRecord := grdContactsView1.DataController.Values[Index, colContactGuid.ID];
try
for i := 0 to grdContactsView1.DataController.FilteredRecordCount - 1 do
begin
Index := grdContactsView1.DataController.FilteredRecordIndex[i];
CurrentRecord := grdContactsView1.DataController.Values[Index, colContactGuid.ID];
if grdContactsView1.DataController.LocateByKey(CurrentRecord) then
begin
grdContactsView1.DataController.Edit;
grdContactsView1.DataController.SetEditValue(colContactSelected.ID, fSelected, evsText);
grdContactsView1.DataController.Post;
end;
end;
finally
grdContactsView1.DataController.LocateByKey(MarkedRecord);
end;
Screen.Cursor := crDefault;
end;
end;
I can reproduce your problem using the sample project I posted in my answer to your other q.
Try this: Add a TMemo to your form, and inside the 'if grdContactsView1.DataController.LocateByKey(Contact) then' block, write the value of a row-unique datafield and the Selected datafield value to the memo.
Then, what I get when some row other than the top row is selected is that one row is listed twice in the memo, with Selected both false and true, and one of the rows in the filter isn't listed at all, which I think accounts for the behaviour you're seeing. If I then comment out the .Edit .. .Post lines, it correctly lists all the rows in the filter.
So evidently doing the Selected field changes inside a block which iterated the FilteredRecordIndex property of the DBTableView is what's causing the problem.
Personally, I find that it goes a bit against the grain to modify dataset rows in code via a DB-aware control (because you usually end up fighting the DB-awareness of the control), but in this case, it's straightforward to do the processing via the DBTableView of the cxGrid.
procedure TForm1.ProcessFilteredRecords;
var
PrevV,
V : Variant;
i,
Index: Integer;
S : String;
begin
// First, pick up a reference to the current record
// so that we can return to it afterwards
Index := cxGrid1DBTableView1.DataController.FocusedRecordIndex;
PrevV := cxGrid1DBTableView1.DataController.Values[Index, 0];
try
for i := 0 to cxGrid1DBTableView1.DataController.FilteredRecordCount - 1 do begin
Index := cxGrid1DBTableView1.DataController.FilteredRecordIndex[i];
V := cxGrid1DBTableView1.DataController.Values[Index, 0];
if cxGrid1DBTableView1.DataController.LocateByKey(V) then begin
cxGrid1DBTableView1.DataController.Edit;
// 2 is the index of my Selected column in the grid
if cxGrid1DBTableView1.DataController.SetEditValue(2, True, evsText) then
Caption := 'OK'
else
Caption := 'Failed';
cxGrid1DBTableView1.DataController.Post;
end;
end;
finally
if cxGrid1DBTableView1.DataController.LocateByKey(PrevV) then
Caption := 'OK'
else
Caption := 'Failed';
end;
end;
Another way to avoid the problem is to change the Selected states in two steps:
Iterate the FilteredRecordIndex to build a list of rows to change - in your case this would be a list of guids
Then, iterate the list of rows and update their Selected states.
Code:
procedure TForm1.ProcessFilteredRecords;
var
V : Variant;
i,
Index: Integer;
BM : TBookMark;
S : String;
TL : TStringList;
begin
Memo1.Lines.Clear;
TL := TStringList.Create;
try
for i := 0 to cxGrid1DBTableView1.DataController.FilteredRecordCount - 1 do begin
Index := cxGrid1DBTableView1.DataController.FilteredRecordIndex[i];
V := cxGrid1DBTableView1.DataController.Values[Index, 0];
if cxGrid1DBTableView1.DataController.LocateByKey(V) then begin
if CDS1.FieldByName('Selected').AsBoolean then
S := 'True'
else
S := 'False';
S := CDS1.FieldByName('Name').AsString + ' ' + S;
Memo1.Lines.Add(S);
TL.Add(CDS1.FieldByName('Guid').AsString);
end;
end;
try
BM := CDS1.GetBookMark;
CDS1.DisableControls;
for i := 0 to TL.Count - 1 do begin
if CDS1.Locate('guid', TL[i], []) then begin
CDS1.Edit;
CDS1.FieldByName('Selected').AsBoolean := True;
CDS1.Post;
end
end;
finally
CDS1.EnableControls;
CDS1.GotoBookmark(BM);
CDS1.FreeBookmark(BM);
end;
finally
TL.Free;
end;
end;
Like you, I was expecting that changing a property or two of the cxGrid might avoid the problem without any code, but I haven't been able to find anything which does.

Limiting checked items of TCheckListBox on Delphi

I want to limit a TCheckListBox.
I desire only 2 items should be checked, and all unchecked items will be disabled and grayed.
Since the checked / unchecked items are dynamic, i can not use a static itemIndex.
Here is what i tried, but i got "Out of chip bounds" error.
On click event of my CheckListBox ;
var
NumberOfCheckedItems, I: Integer;
begin
NumberOfCheckedItems := 0;
for I := 0 to CkLst1.Count - 1 do
begin
if CkLst1.Checked[I] then
NumberOfCheckedItems := NumberOfCheckedItems + 1;
end;
if NumberOfCheckedItems > 1 then
begin
CkLst1.Checked[I] := Enabled;
CkLst1.Enabled := FALSE;
CkLst1.AllowGrayed := TRUE;
end
else
begin
//no idea
end;
end;
This method should do the job
procedure DoCheckListBox( AChkLb : TCheckListBox; AMaxCheck : Integer );
var
LIdx : Integer;
LCheckCount : Integer;
begin
// counting
LCheckCount := 0;
for LIdx := 0 to AChkLb.Count - 1 do
begin
if AChkLb.Checked[LIdx] then
if LCheckCount = AMaxCheck then
AChkLb.Checked[LIdx] := False
else
Inc( LCheckCount );
end;
// enable/disable
for LIdx := 0 to AChkLb.Count - 1 do
AChkLb.ItemEnabled[LIdx] := AChkLb.Checked[LIdx] or ( LCheckCount < AMaxCheck );
end;
UPDATE
You better call this inside TCheckListBox.OnClickCheck event instead of OnClick event.
A double-click can affect the check-state but OnClick is not called.
OnClickCheck is called whenever the check-state changes.

Calculation on a hidden field

I am hiding a field so that when it is shown (on checkbox checked) it preforms a certain calculation.
procedure TForm1.cxCheckBox1Click(Sender: TObject);
var
C:TcxGridDBColumn;
begin
if ABSTable1.FieldByName('CENIK_IME').AsString = 'PAK' then begin
C := cxGrid2dbtableview1.GetColumnByFieldName('TT');
if Assigned(C) then C.Visible := not C.Visible;
ABSQuery2.Edit;
ABSQuery2.FieldByName('TOTAL').AsCurrency := (ABSQuery2.FieldByName('TOTAL').AsCurrency) + (ABSQuery2.FieldByName('TT').AsCurrency);
ABSQuery2.Refresh;
end;
end;
Problem is that every time I check or uncheck the checkbox my TOTAL gets bigger and bigger. Any way to prevent the checkbox from summing every time it gets checked or unchecked ?
Also I have this on calculate fields of the query ;
procedure TForm1.ABSQuery2CalcFields(DataSet: TDataSet);
begin
ABSQuery2.FieldByName('TT').Value:= (ABSQuery2.FieldByName('DAYS').AsCurrency) * 1.01 ;
end;
This is all done on a Temp table which is used just for the occassion. Contents get deleted all the time....
Won't you need to subtract ABSQuery2.FieldByName('TT').AsCurrency if the column is hidden?
And also only change Total if the TT is found?
So:
procedure TForm1.cxCheckBox1Click(Sender: TObject);
var
C:TcxGridDBColumn;
begin
if ABSTable1.FieldByName('CENIK_IME').AsString = 'PAK' then begin
C := cxGrid2dbtableview1.GetColumnByFieldName('TT');
if Assigned(C) then
begin
C.Visible := not C.Visible;
ABSQuery2.Edit;
if C.Visible then
ABSQuery2.FieldByName('TOTAL').AsCurrency := (ABSQuery2.FieldByName('TOTAL').AsCurrency) + (ABSQuery2.FieldByName('TT').AsCurrency)
else
ABSQuery2.FieldByName('TOTAL').AsCurrency := (ABSQuery2.FieldByName('TOTAL').AsCurrency) - (ABSQuery2.FieldByName('TT').AsCurrency);
ABSQuery2.Post;
ABSQuery2.Refresh;
end;
end;
end;

How to delete selected records from TDBAdvGrid?

I want to delete multiple selected records which I have displayed at TDBAdvGrid. A number of records are being selected by checking checkbox in front of them. After clicking on Delete button it triggers procedure as follows. It is returning values of selected rows id successfully only problem with deletion of all records. It deletes only first selected record.
procedure TForm5.Button3Click(Sender: TObject);
var
i,j,idn: Integer;
State: Boolean;
begin
j := 0;
for i := 1 to DBAdvGrid1.RowCount - 1 do
begin
if DBAdvGrid1.GetCheckBoxState(1,i,state) then
begin
if state then
begin
idn := StrToInt(DBAdvGrid1.Cells[6,i]);
UniQuery1.SQL.Text := 'Delete from userplays where id = :id';
UniQuery1.ParamByName('id').AsInteger := idn;
UniQuery1.ExecSQL;
end;
end;
end;
end;
It is deleting only first record in lineup. After deleting first record it breaks for loop and control goes back to TDBAdvGrid with updated data after delete.
Final code based on suggestion is as follows
j := 0;
DBAdvGrid1.BeginUpdate;
for i := 1 to DBAdvGrid1.RowCount - 1 do
begin
showmessage('inside rowcount loop');
if DBAdvGrid1.GetCheckBoxState(1,i,state) then
begin
if state then
begin
DBAdvGrid1.DataSource.DataSet.First;
DBAdvGrid1.DataSource.DataSet.MoveBy(i - 1 - j);
DBAdvGrid1.DataSource.DataSet.Delete;
j := j+1;
continue;
end;
end;
end;
This code works perfectly only when PageMode := False
Based on the suggestion above, I would like to make another suggestion...
//DBAdvGrid1.BeginUpdate;
query.First;
for i := 1 to DBAdvGrid1.RowCount - 1 do
begin
if DBAdvGrid1.GetCheckBoxState(1,i,state) then
begin
if state then
begin
//you can do whatever you want with the current selected record
end;
end;
query.Next;
end;
I think this is easier then using the MoveBy...
I even never changed PageMode, it's still on true. No idea if it's coincidence or not.
You can use cyBookmarks in the OnCheck event , with Virtual Table.
It creates a list of all records selected, and you can list them with
cyBookmarks.bookmarklits.count, so my example is like this :
procedure TForm2.cyDBGrid1CheckBoxClick(Sender: TObject);
begin
if cyBookmarks1.AddCurrentRecord then
begin
cyBookmarks1.BookmarkList.InsertBookmark(cyDBGrid1.CheckedList.CurrentRecord);
cyDBGrid1.Invalidate ;
end
else
begin
cyBookmarks1.RemoveCurrentRecord;
cyDBGrid1.Invalidate;
end;
if cyBookmarks1.BookmarkList.Count>0 then
begin
VirtualTable1.GotoBookmark(cyBookmarks1.BookmarkList.Items[0]);
lbl1.Caption:=VirtualTable1.FieldByName('N_ENREGISTREMENT').AsString;
end;
end;

GetFormFieldNames not always working

I am trying to find out which form and element belongs too. The code that I now understand from this website:
http://www.cryer.co.uk/brian/delphi/twebbrowser/read_write_form_elements.htm
containing this code
function GetFormFieldNames(fromForm: IHTMLFormElement): TStringList;
var
index: integer;
field: IHTMLElement;
input: IHTMLInputElement;
select: IHTMLSelectElement;
text: IHTMLTextAreaElement;
begin
result := TStringList.Create;
for index := 0 to fromForm.length do
begin
field := fromForm.Item(index,'') as IHTMLElement;
if Assigned(field) then
begin
if field.tagName = 'INPUT' then
begin
// Input field.
input := field as IHTMLInputElement;
result.Add(input.name);
end
else if field.tagName = 'SELECT' then
begin
// Select field.
select := field as IHTMLSelectElement;
result.Add(select.name);
end
else if field.tagName = 'TEXTAREA' then
begin
// TextArea field.
text := field as IHTMLTextAreaElement;
result.Add(text.name);
end;
end;
end;
end;
seems to be working fine for most sites. However there are a few websites such as this one:
http://service.mail.com/registration.html#.1258-bluestripe-product1-undef
By looking at that code and comparing it with the active id, I can find the form it is in. However it does not work for that website. for some reason I think it has to do with htmldocument3 adn that this code is for htmldocument2. But I am not sure.
so my question is How can I extract a tstringlist from this website with all the elements names in them? hope you can help!
Edited: Added some code
begin
theForm := GetFormByNumber(webbrowser1.document as IHTMLDocument2,
0);
fields := GetFormFieldNames(theForm);
num := fields.IndexOf(theid);
end;
until (num <> -1);
One complication with locating form elements in a web page is that the page may contain frames and there may be forms in any of the frames. Basically, you have to iterate through all the frames and the forms in each frame. Once you get the form as an IHTMLFormElement, use Cryer's function to get the form element names.
The example link you gave does not have any frames and you should have had no problems getting your list of form elements, unless you tried to get the form by name because it had no name assigned. I had no problem getting the form element names and values using the following procedure
procedure GetForms(doc1: IHTMLDocument2; var sl: TStringList);
var
i, j, n: integer;
docForm: IHTMLFormElement;
slt: TStringList;
s: string;
begin
if doc1 = nil then
begin
ShowMessage('doc1 is empty [GetForms]');
Exit;
end;
slt := TStringList.Create;
n := NumberOfForms(doc1);
sl.Add('Forms: ' + IntToStr(n));
for i := 0 to n - 1 do
begin
docForm := GetFormByNumber(doc1, i);
sl.Add('Form Name: ' + docForm.Name);
slt.Clear;
slt := GetFormFieldNames(docForm);
for j := 0 to slt.Count - 1 do
begin
s := GetFieldValue(docForm, slt[j]);
sl.Add('Field Name: ' + slt[j] + ' value: "' + s + '"');
end;
end;
sl.Add('');
slt.Free;
end;
Cryer's example for navigating a frameset will not work for all web sites, see http://support.microsoft.com/support/kb/articles/Q196/3/40.ASP. The following function successfuly extracts a frame as an IHTMLDocument2 on all sites I have tried
function GetFrameByNumber(Doc:IHTMLDocument2; n:integer):IHTMLDocument2;
var
Container: IOleContainer;
Enumerator: ActiveX.IEnumUnknown;
Unknown: IUnknown;
Browser: IWebBrowser2;
Fetched: Longint;
NewDoc: IHTMLDocument2;
i : integer;
begin
// We cannot use the document's frames collection here, because
// it does not work in every case (i.e. Documents from a foreign domain).
// From: http://support.microsoft.com/support/kb/articles/Q196/3/40.ASP
i := 0;
if (Supports(Doc, IOleContainer, Container)) and
(Container.EnumObjects(OLECONTF_EMBEDDINGS, Enumerator) = S_OK) then
begin
while Enumerator.Next(1, Unknown, #Fetched) = S_OK do
begin
if (Supports(Unknown, IWebBrowser2, Browser)) and
(Supports(Browser.Document, IHTMLDocument2, NewDoc)) then
begin
// Here, NewDoc is an IHTMLDocument2 that you can query for
// all the links, text edits, etc.
if i=n then
begin
Result := NewDoc;
Exit;
end;
i := i+1;
end;
end;
end;
end;
Here is an example of how I have used GetForms and GetFrameByNumber
// from the TForm1 declaration
{ Public declarations }
wdoc: IHTMLDocument2;
procedure TForm1.btnAnalyzeClick(Sender: TObject);
begin
wdoc := WebBrowser.Document as IHTMLDocument2;
GetDoc(wdoc);
end;
procedure TForm1.GetDoc(doc1: IHTMLDocument2);
var
i, n: integer;
doc2: IHTMLDocument2;
frame_dispatch: IDispatch;
frame_win: IHTMLWindow2;
ole_index: olevariant;
sl: TStringList;
begin
if doc1 = nil then
begin
ShowMessage('Web doc is empty');
Exit;
end;
Form2.Memo1.Lines.Clear;
sl := TStringList.Create;
n := doc1.frames.length;
sl.Add('Frames: ' + IntToStr(n));
// check each frame for the data
if n = 0 then
GetForms(doc1, sl)
else
for i := 0 to n - 1 do
begin
sl.Add('--Frame: ' + IntToStr(i));
ole_index := i;
frame_dispatch := doc1.Frames.Item(ole_index);
if frame_dispatch <> nil then
begin
frame_win := frame_dispatch as IHTMLWindow2;
doc2 := frame_win.document;
// sl.Add(doc2.body.outerHTML);
GetForms(doc2,sl);
GetDoc(doc2);
end;
end;
// Form2 just contains a TMemo
Form2.Memo1.Lines.AddStrings(sl);
Form2.Show;
sl.Free;
end;
The logic in your example is faulty, 1. when there is only 1 form on the web page the list of form elements is never extracted, 2. the repeat loop will result in a access violation unless the the tag in "theid" is found
Here is your example cut down to successfully extract the form elements.
var
i : integer;
nforms : integer;
document : IHTMLDocument2;
theForm : IHTMLFormElement;
fields : TStringList;
theform1 : integer;
num : integer;
theid : string;
begin
fields := TStringList.Create;
theid := 'xx';
// original code follows
i := -1;
// nforms := NumberOfForms(webbrowser1.document as IHTMLDocument2);
// document := webbrowser1.document as IHTMLDocument2;
// if nforms = 1 then
// begin
// theForm := GetFormByNumber(webbrowser1.document as IHTMLDocument2, 0);
// theform1 := 0;
// end
// else
begin
// repeat
begin
inc(i);
theForm := GetFormByNumber(webbrowser1.document as IHTMLDocument2,
i);
fields := GetFormFieldNames(theForm);
num := fields.IndexOf(theid);
theform1 := i;
end;
// until (num <> -1);
end;
// end of original code
Memo1.Lines.Text := fields.Text;
fields.Free;
end;
Hm, are you sure this link contains any form elements? At least I did not see any visible ones. Perhaps they are hidden - did not check this myself, however.
Michael

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