I'm trying to display data in devexpress grid control. I have a column called gender that takes bit values. I want to display the data that when its 1 the cell show Female and when its 0 the cell show male.
just add columEditItem and set it to lookUpEdit.
Add in lookUpEdit two items the first with text male having a value true and the second with text female having a value false.
Set the column to readOnly
So,whenever the value is true it will shows male and same for female on false
hope this helps you.
feel free to ask any question
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I'm working on a wpf application that display a datagrid with 7 columns:
ID, Value1,Value2,Value3,Value4,Value5,Total. ID and Total are not editable form the user, only the other. Once the user have clicked on one cell and change it (only 0 and 1 allowed), I'd like that when he press 1 or 0 the value is entered and commited going to the next editable cell,(that can be also in the next row.
Is there a way to do that in wpf?
You may try CellEndEdit event and put your calculateTotal method there.
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I create DataGridView1 and populate it so that each cell is a ComboBox with data from ComboNames() which is as list of names from a text file. In the main form code I declare a global array called DropDownArray() which is a copy of ComboNames() so I can use it in other Subs. When I test/debug, the form loads and I can do anything in the form without error (there are a bunch of buttons and a separate ListBox). But as soon as I change a cell value in the grid it breaks. Error Message at the bottom after my code. Hopefully I am not trying to do something that cannot be done since I've put quite a lot of time into this project
Snippet of DataGridView Setup:
DataGridView1.ColumnCount = 12
DataGridView1.RowCount = 12
DataGridView1.RowHeadersWidth = 50
For row As Integer = 0 To 11
DataGridView1.Rows(row).HeaderCell.Value = (row + 1).ToString()
For col As Integer = 0 To 11
DataGridView1(col, row) = New DataGridViewComboBoxCell
Next
Next
Snippet of ComboBox Setup:
Dim combo As DataGridViewComboBoxCell
For row = 0 To DataGridView1.Rows.Count - 1
For col = 0 To DataGridView1.Columns.Count - 1
combo = DataGridView1(col, row)
combo.DataSource = ComboNames
Next
Next
Started = 1
My failed attempt to update unchanged cells to have a new ComboBox DataSource of UpdatedNamesList():
Private Sub DataGridView1_SelectionChanged(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellValueChanged
Dim UpdatedNameList As New List(Of String)()
UpdatedNameList = DropDownArray '!!! DropDownArray() = ComboNames() !!!
If started = 1 Then
If DataGridView1.CurrentCell.Value.ToString.Length > 4 Then 'Shortest name is Brian
GridNames.Add(DataGridView1.CurrentCell.Value.ToString)
End If
Dim Difference As IEnumerable(Of String) = DropDownArray.Except(GridNames)
For x As Integer = 0 To DropDownArray.ToString.Length - 1
UpdatedNameList(x) = Difference(x)
Next
Dim combo As DataGridViewComboBoxCell
For row = 0 To DataGridView1.Rows.Count - 1
For col = 0 To DataGridView1.Columns.Count - 1
combo = DataGridView1(col, row)
If combo.Value.ToString.Length < 4 Then
combo.DataSource = UpdatedNameList
End If
Next
Next
End If
End Sub
I get a Break error with no reference to my code so I have no idea what I am messing up on. The error text reads:
System.NullReferenceException: 'Object reference not set to an instance of an object.'
NameGrid.Form1.DataGridView1_SelectionChanged(Object, System.Windows.Forms.DataGridViewCellEventArgs) in Form1.vb
It will be difficult to proffer a good answer as I feel there may not be a good one. I do not want to dissuade you from what you are trying to do, however I hope I can give you a better idea of what is required to achieve what you ask. Basically this is a continuation of my comments (which you ignored) from your previous question… Initializing VB.NET DataGridView to have all Combo Boxes; Button to populate from Array
For starters, the way the code adds the combo boxes to the cells in the grid is …. just wrong. Please let me clarify…
The DataGridView has a column “TYPE” specifically for “combo boxes.” It is called a DataGridViewComboBoxColumn and it is what you should use. Instead, your code is adding DataGridViewTextBoxColumn’s to the grid and then places a DataGridViewComboBoxCell into each of the Text Box cells… ? … This may well work, however it only complicates things and “creates” more work for you. There is a better way.
Example, looking at the first snippet of code for the DataGridView setup…
DataGridView1.ColumnCount = 12
DataGridView1.RowCount = 12
DataGridView1.RowHeadersWidth = 50
For row As Integer = 0 To 11
DataGridView1.Rows(row).HeaderCell.Value = (row + 1).ToString()
For col As Integer = 0 To 11
DataGridView1(col, row) = New DataGridViewComboBoxCell
Next
Next
You should note the first line in this code…
DataGridView1.ColumnCount = 12
This is adding 12 “TEXT BOX” columns and you should be adding 12 “COMBO BOX” columns. If you use a DataGridViewComboBoxColumn instead of a DataGridViewTextBoxColumn, then you can remove the line of code in your loop that adds a DataGridViewComboBoxCell…
DataGridView1(col, row) = New DataGridViewComboBoxCell
The grid will “automatically” create a DataGridViewComboBoxCell for each cell in the combo box column. If a new row is added, it will automatically add the DataGridViewComboBoxCells. Therefore, to do this using a DataGridViewComboBoxColumn may look something like…
For index = 1 To 12
DataGridView1.Columns.Add(New DataGridViewComboBoxColumn())
Next
DataGridView1.RowCount = 12
DataGridView1.RowHeadersWidth = 50
For row As Integer = 0 To 11
DataGridView1.Rows(row).HeaderCell.Value = (row + 1).ToString()
Next
If you run the code above, you will note that each cell is “already” a DataGridViewComboBoxCell and there is no need for your code to add one. In addition, since your code is using a TextBoxColumn it may be one reason that the code fails on the line… combo = DataGridView1(col, row) ….
Next… In relation to the combo boxes having different values… you need to keep in mind that you are wanting to manage 12x12=144 combo boxes! If all 144 combo boxes list of items contained the same values then it is fairly straight forward and we could easily set each combo boxes data source to the same list of items. However, it would be easier to set each DataGridViewComboBoxColumn’s DataSource to the same list and each column will use this list for all the combo box cells in that column. Therefore you could change the code above that adds the combo box columns to…
For index = 1 To 12
Dim col = New DataGridViewComboBoxColumn()
col.DataSource = ComboNames
DataGridView1.Columns.Add(col)
Next
This will eliminate the need for the second code snippet ComboBox Setup
However, my understanding is you want… that if the user “selects” a particular item in one combo box, then, that selected item would NOT be available in any of the other combo boxes list of items.
This is certainly doable; however, it should be clear that… if each combo box had a different value selected… then technically… there would have to be 144 different data sources! Each individual combo boxes data source would have to be unique.
If we continue… let us take a closer look at what is involved when the user changes a combo box’s selected value. Initially, when the form loads, all the combo boxes are empty and each combo box uses the “same” data source.
Now the user changes the selected value in one of the “empty” combo boxes… Once the user selects a value, then one of the grid’s events fires to let us know which cell value changed. Let us say the user selected “Choice 1” in the combo box. Since ALL the combo boxes use the same data source and contain the same values, then we could simply “remove Choice 1” from that list of items.
HOWEVER, if we remove “Choice 1” item from the list… then the current combo box which HAS the value “Choice 1” selected will fail and you will get the grids DataError as “Choice 1” will not be in the combo boxes list of items. Therefore, we would need to add “Choice 1” ONLY to THAT combo boxes list of items. This makes THAT combo boxes data source UNIQUE and we can no longer use the same data source the other (non-selected) combo boxes use. Therefore let us assume that we create a unique list of items specifically for that combo box and continue.
Now the user selects a different combo box. We know that “Choice 1” will NOT be an item in the combo boxes list of items since we removed it from the list. Continuing, let us say the user selected “Choice 3” and the grids changed event fires and we proceeded as we did previously… we remove “Choice 3” from the list for all the combo boxes using the same data source and add “Choice 3” to the current combo boxes list of items. However…
We would ALSO need to remove “Choice 3” from ANY combo box that has already selected an item. We need to do this for each previously changed combo box since those combo boxes have their own UNIQUE list of items. Therefore, as the user changes more and more combo boxes, the code has to do more and more work.
Also note that the previous example “assumes” that when the user selects an item in the combo box, that the selected item in the combo box was originally “empty”… meaning nothing was previously selected. If the user selected a value for the combo box and sometime later “changed” that selected value to a different value… then… we would need to PUT BACK the previously selected value so the other combo boxes CAN select that value. This would include any previously changed combo box!
I hope you can see from the previous example, that it is NOT going to be trivial to manage 144 combo boxes in the manner you describe. Initially, when all the combo boxes are the same… it is trivial… however, as the user changes more and more combo boxes, it would not be surprising to possibly see a sluggish UI when combo box changes are made.
Please forgive my harangue and am only trying to help. It should be fairly clear that managing the combo boxes as you want will NOT be trivial especially using a DataGridViewComboBoxCell. I hope I cleared some things up.
And finally, I have to ask if you have seriously sat down and actually “used” your 12x12 grid of combo boxes… I ran a few tests and can only speak for myself… however… as a user… looking at 144 combo boxes was not pleasant. I am not sure what the overall goal is, however from a user perspective I would consider the 12x12 combo box grid a questionable UI choice. We already know it is NOT going to be trivial to implement and it is going to suck if you go to all the effort to make it work only to find the users hate it.
Main point being… it sounds like you may need to go back to the “data design” phase. What you want to do is not that unusual, however there are just too many combo boxes and too many items in each combo box… that is the “real” problem and it is a “data design” problem… not a UI problem. Good Luck.
I solved my problem. It's slow and very inefficient but that's for another question page. The issue I originally had was changing DataSource of "Unchanged" cells in a DataGridView while preserving ones that had been changed. Easy thing to do. But the issue in my code was a call to the following:
If DataGridView1.CurrentCell.Value.ToString.Length > 4 Then
On cells that had not been touched there is no length. If you try and call that on an "unchanged" cell, it will break but not reference any code. So instead I loop on each cell on CellValueChanged and do a Try Catch so if it fails I change the DataSource to the new array and if not, I just add the value to the running list of entries in the grid. It's slow (about 4 seconds between cell change and allowing me to change next cell) but works. I'm open to optimization, but again, the answer is "Do not try and get length of an unchanged cell".
Working Code to update unchanged cells to have a new ComboBox DataSource of UpdatedNamesList():
Private Sub DataGridView1_SelectionChanged(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellValueChanged
Dim UpdatedNameList As List(Of String) = DropDownArray
Dim combo2 As DataGridViewComboBoxCell
If started = 1 Then
For row = 0 To DataGridView1.Rows.Count - 1
For col = 0 To DataGridView1.Columns.Count - 1
Try
If DataGridView1(col, row).Value.ToString.Length >= 4 Then
GridNames.Add(DataGridView1(col, row).Value.ToString)
End If
Catch
Dim Difference As IEnumerable(Of String) = DropDownArray.Except(GridNames)
For x As Integer = 0 To DropDownArray.ToString.Length - 1
UpdatedNameList(x) = Difference(x)
Next
combo2 = DataGridView1(col, row)
combo2.DataSource = UpdatedNameList
End Try
Next
Next
End If
End Sub
What is the way to grey out a Lotus Notes checkbox?
I use the Input Enabled calculation, but it disappears when the Value is #TRUE. I just want the input disabled.
Create a second checkbox, set it to the type "Computed for Display". Then you use a hide-when formula to display the computed one and hide the editable one based on your criteria.
The values of CheckBox must be a text values. #True is wrong value for CheckBox. So, if your CheckBox field contains right values, then you can use Input Enabled calculation.
For example, if your CheckBox have this choices:
then if the value of CheckBox is "Value0":"Value2" and Input Enabled calculation is evaluates to #False then you receive this result:
I have a datagrid from devexpress in a winform application.I populated the datagrid from code (datasource=my datatable with 2 strings columns and one of type int (receive 0 and 1 values-should be checkbox on form).
I added a datagrid and from designer I added 3 columns.The last one of type checkbox.I set
UnboundType=Integer,
UnboundExpression=my column name from datatable :
DisplayFormat = Numeric,
columnedit = checkbox,
Displaycheckedvalue = 1,
displayuncheckedvalue = 0.
When I run the application always my checkboxes are blue.If i press one checkbox appear a check but when i go to the next row the previous value is again blue.What should i do so why the application keep the checks?
Don't set the column to be unbound, it is in your datasource after all.
What you want to do is just to set Displaycheckedvalue and displayuncheckedvalue as you have done, nothing more.
You can make a class which got a property for each column of your table. The int value would be a bool and so you can use List as datasource. The Grid will automaticly add checkboxes for the bool value.
If you want to use DataTable see Stig's post but in my opinion it is more beautiful to use classes and List.
I 've created an Infopath 2010 form. It contains some checkbox, the user can choose more than 1 checkbox, and I want to merge these values into 1 textbox. here is the example:
[ ] Value 1 <=this is the checkbox
[*] Value 2 <=this is the checkbox (selected)
[*] Value 3 <=this is the checkbox (selected)
[Value2, Value3, and some text that add manually] <=this is the textbox that I want to merge the value and add this value to 1 column in database.
can you tell me how to do this?
You could have a rule on each of those checkboxes that runs when the checkbox is changed. Each rule would look up the other values and text, concatenate them how you need it, and set the value of the final textbox to that string.