For the auto-complete functionality, it will automatically matching the prefix of the items.
And focus the first of the filtered items. But i would like to let the combo-box focus on the last items of the filtered items.
For instance, if the dataset are "ABA,ABB,ACC", if i input AB, the ABA and ABB will be filtered, and the focus will be on the ABA(above ABB), now what i want is focus on ABB(below ABA).
I checked that combo-box does have AutoCompleteMode, but none of them seems can do this
You can specify a custom auto complete source that is different from the combo-box items list. This allows you to specify entries that are sorted in reverse order and to keep the right order for the combo-box items at the same time
cb.AutoCompleteSource = AutoCompleteSource.CustomSource;
var strings = new AutoCompleteStringCollection();
strings.AddRange(arrayWithItemsInReverseOrder);
cb.AutoCompleteCustomSource = strings;
Related
While working with Perl and Gtk2, I have to programmatically remove an option from a drop-down (ComboBox). While I'm aware that $combo_box->remove_text ($position) will do the trick in one shot, I need to remove the option based on its name (entered by the user).
I'm unable to find a method that can return the index of an item by its name. Could someone help out?
It's a bit unclear what you mean by "name"; combo box items don't have names. If the combo box is textual, then each item is made up of text, but that text isn't a name. You could have the same string in all items for instance, which would make it very unclear which one you want to delete.
I think you're going to have to implement it youself, by iterating over the combo box's underlying tree model. Then it's up to you if you want to just delete the first match, continue searching to find all of them.
Im trying to implement several rules for a form, based on a selection of some multiple selection list boxes. Im customizing a form for a existing SharePoint list by clicking on "Customize Form" in SharePoint. First of all, the choice fields on the list (multiple selection) are oddly binded in InfoPath:
I cant change the variable's name "Value" and Real Estate Categories should not be a required field. (*)
On one view I have a "Business Unit Purchase" box that is a multiple selection box (choice) and there is a next button. The next button should only be availiable when a selection is made.
So I tried to the following rules for the Next Button:
Rule Type Action:
IF Value (of Business Unit Pruchase) is not blank -> Switch to next view
This works properly, but now i wanted to disable the next button when nothing is the text box was selected, because it makes it more clear to have a selection beofre ist possible to go on. So I tried this:
Rule Type Formatting:
IF Value is blank -> disable this control
This disables the button as wanted when the multiple text box has not any items selected, but after selecting one or more, nothing happens. Is there any reason why this does not work?
Normally when a selection is made, the field "value" of "Business Unit Purchase" should contain one or more strings and therefor should not be blank anymore.
A multiselect list box almost always contains one blank element entry unless it has been manually removed (e.g. via code).
Because of this, the condition Value is blank will almost always be true.
To remedy this, use the dropdown in the Condition builder's field selection dialog to set up your condition as:
All occurrences of Value are blank -> Disable this control
If you do this, the control should be enabled when one or more items are selected.
I've been learning more about the d3 visualization library, and I've seen a few examples of bar charts that have a snippet that looks like
chart.selectAll("rect")
.data(data)
.enter().append("rect")
.attr("y", y)
.attr("width", x)
.attr("height", y.rangeBand());
My confusion is with the first selectAll line. What is the purpose of selecting all rects before they exist since we'll be appending new rects on data enter? Does what goes in the selectAll matter if none of those elements exist?
It is part of the declarative nature of the D3 language. The Thinking with Joins article explains it in detail. An excerpt:
But what’s with the selectAll("circle")? Why do you have to select
elements that don’t exist in order to create new ones? WAT.
Here’s the deal: instead of telling D3 how to do something, tell D3
what you want. In this case, you want the circle elements to
correspond to data: you want one circle per datum. Instead of
instructing D3 to create circles, then, tell D3 that the selection
"circle" should correspond to data—and describe how to get there. This
concept is called the data-join:
This Venn diagram illustrates the data-join. Data bound to existing
elements produce the update (inner) selection. Unbound data produce
the enter selection (left), and unbound elements produce the exit
selection (right). Data Enter Update Elements Exit Thinking with joins
reveals the mystery behind the sequence:
The selectAll("circle") returns the empty selection, since the SVG
container element (svg) is empty. No magic here.
The empty selection is joined to data: data(data). The data method
binds data to elements, producing three virtual selections: enter,
update and exit. The enter selection contains placeholders for any
missing elements. The update selection contains existing elements,
bound to data. Any remaining elements end up in the exit selection for
removal.
Since the selection was empty, all data ends up as placeholder nodes
in enter().
This is the same append as in the first example, but applied to
multiple placeholders; selection methods implicitly iterate over
selected elements. The missing elements are added to the SVG container
by append("circle").
So that’s it. You wanted the selection "circle" to correspond to data,
and you described how to create the missing elements.
In your example selectAll("rect") is called first. But it returns an empty selection.
data(data) will bind the empty selection with the data. It creates new empty selections.
.enter() identifies any DOM elements that needs to be added when the joined array is longer than the selection.
append("rect") appends a rectangle to each empty selection, which is no longer empty
It is well explained and detailed on this section: D3.js data binding, How it works?
I have a form with 10 listboxes on it. I also have a command button. How do I make it so that if I press the command button it will select the 3rd item of a listbox of my choosing?
You may do so by converting your 10 listboxes into a control array. If I remember correctly, you do so by specifying the same Name property and a unique, non-negative Index property for each one of the ListBox instances in your form.
Assuming you named all of your list boxes as ListBoxArr and set up the Index property so that the first listbox is 0, the second one is 1, etc. then you can write something like this
' Access the 6th list box and select the third item
' Remember, Index values are zero-based, so 0 is first item...
ListBoxArr(5).ListIndex = 2
I have a few text boxes which have to be filled with numeric values from 0 to 100. Below them there is another text box which stands for a total (the sum of the values from the text boxes above). How can I update the sum text box while typing in any of the other text boxes above?
If you are happy that the sum box updates after a box is updated (enter, tab or such like is pressed), then this can be done without any code. First, you will need to set the format of the textboxes to be summed to numeric, then the control source of the sum box becomes:
=Nz([text0],0)+Nz([text2],0)+Nz([text4],0)+Nz([text6],0)+Nz([text8],0) ...
Note the use of Nz, it may be possible to eliminate this by setting the default value property of the various textboxes to be summed.
A large set of controls that need to be summed in this way is often an indication of an error in the design of the database. You would normally expect this kind of thing to be a separate recordset, which could more easily be summed.
I know this is old, but Google didn't come up with much for this topic and this thread didn't really help either. I was able to figure out a very easy way to do this, so hopefully anyone else looking for this will find this helpful.
My need was for actual text as opposed to numbers, but the same applies.
To do what the OP is asking for you'll need at least 3 textboxes. 1 is the textbox you want to have updated each time you type, 2 is the textbox you will be typing in, and 3 is a hidden textbox.
Set textbox 1 to reference the value of the hidden textbox 3 in its control source:
="something in my textbox " & [textbox3]
In the OnChange event of textbox 2 right a line that will set the value of the hidden textbox 3 to the Text property of textbox 2 that you are typing in:
Private Sub textbox2_Change()
Me.textbox3.Value = Me.textbox2.Text
End Sub
Each time the value of the hidden textbox 3 gets updated, the calculation/reference in the displayed textbox 1 will be updated. No need to save caret locations or anything else mentioned in this post.
I was able to do this in Access 2007 by using the On Lost Focus event of the text box.
Just put something like this on the On Lost focus event of each text box that you want to be added , just make sure to set the default value of each text box to 0.
Me.Totals.Value = Me.Text1.Value + Me.Text2.Value + etc..
The moment you click on the next text box or anywhere as long as it loses focus, your sum will already be on the Totals box. You may add as many text boxes as you like, just include them in the code.
This is problematic due to the asinine requirement in Access that you have to set focus to text areas before you can get their value. I would recommend you change your design so that the text field is updated in response to a button click instead of on change.
If you want to go the update-on-change route, you would attach change events to each of the addend text fields. The event handlers would need to save the caret position/selection length, update the sum in the output text field, and restore the caret position. You need to save/restore the caret position because this is lost when the focus changes.
Here's an example for two text fields (txt1 and txt2). The output field is named txtOutput.
Private Sub txt1_Change()
Dim caret_position As Variant
caret_position = Array(txt1.SelStart, txt1.SelLength)
UpdateSum
txt1.SetFocus
txt1.SelStart = caret_position(0)
txt1.SelLength = caret_position(1)
End Sub
Private Sub txt2_Change()
Dim caret_position As Variant
caret_position = Array(txt2.SelStart, txt2.SelLength)
UpdateSum
txt2.SetFocus
txt2.SelStart = caret_position(0)
txt2.SelLength = caret_position(1)
End Sub
Private Sub UpdateSum()
Dim sum As Variant
sum = CDec(0)
txt1.SetFocus
If IsNumeric(txt1.Text) Then
sum = sum + CDec(txt1.Text)
End If
txt2.SetFocus
If IsNumeric(txt2.Text) Then
sum = sum + CDec(txt2.Text)
End If
txtOutput.SetFocus
txtOutput.Text = sum
End Sub