I have a combobox which has an array of Strings such as "Alice", "Bob",and "Charlie". After user presses the ok button I want to remove all the elements in the combobox. How do I do this during run time ? All I know is to manually right click on the combobox and remove its element one by one.
Thanks.
Settings String[] to an empty array will clear the strings stored in the Combobox, but will not clear the active value visible on the front panel terminal. To clear that as well, use the "Value" property with a blank string.
Here's a snippet:
After having tried many ways this does clear elements but the first element is not removed completely.
Related
In an Access combobox CB I place in CB.value Clt, a string known to be in the dropdown list. Not by typing but by VBA code assignment.
I want to ensure than the dropdown list is on the same value.
I've tried CB.recordset.movenext in a loop until I hit Clt, but this does not move the dropdown list. I've also tried CB.Recordset.FindFirst using an SQL like clause. This also does not move the dropdown list.
How can I do this?
Thanks for any insight.
I want to Set the first Textbox as active, and when I typed in something in the first Box, it goes automatically to the next one. So it loops through all Textboxes. How do I make that?
Thanks!
You should manage the TabIndex property of each TextBoxes. Put the number according to the order of your loop.
Then you should be able to loop through your TextBoxes by pressing Enter or Tab
I have a ComboBox implemented with an auto-completion system. My ComboBox contains more than 100 items. When users are typing text in, the auto-completion system opens the dropdown list and highlights the most relevant item. Moreover, when the dropdown list is expanded, all items are available (no filters). But the most relevant item is always at the bottom of the dropdown list.
I would like it to be in the middle, if possible. One item can have the same reference but another type than another one, that's why I need to see most of them in my dropdown by placing them in the middle.
Any idea ? It's not really important but kind of useful for them. Thanks !
Update :
Here's my ComboBox with the open dropdown. Sorry about that, I had to blur its elements. As you can see, the user starts writting the reference in the ComboBox. The autocompletion works fine, but the corresponding item is found at the end of the dropdown list (in the red frame), almost out of bounds.
I wish it would be highlighted in the middle of my dropdown list instead of so far below.
Your item search may work well, but your list isn't visually filtered, which means it's size always remains the same.
It's scrolled into view, by the wpf system, but still displaying all other items around the relevant one. The reason why it's at the bottom is because wpf Scrollviewer just finished scrolling the item into view and sees no need to scroll it further into the middle.
You could use the CollectionViewSource class. Why ?
It's simple to use, will keep your viewmodel data as it is, and you would have your relevant completion item at the top. It can be obtained by GetDefaultView(..)
Let's say you have a viewmodel flag "IsHidden", stating that it's content does not match the user input:
ICollectionView cv= CollectionViewSource.GetDefaultView(myComboBox.ItemsSource);
// switch filter on
cv.Filter = obj => (obj as myViewModel).IsHidden == false;
// switch off
cv.Filter = null
I have a Source ComboBox to populate source fields (25-30 items) shown below in first page
"A"
"B"
...
"Z"
I have selected last item from ComboBox as shown below
"Z"
and when traversing to the next page after saving, i need to make the source combo selection blank, so i have return the below code to reset the Source combobox to point to first item (to reset the display to start from top of dropdown list for user selection)
// my first value in source List is empty space - “”
sourceComboBox.setValue("");
even if you use below code snippets like
sourceComboBox.getSelectionModel().selectFirst();
sourceComboBox.getItems().clear();
sourceComboBox.getSelectionModel().clearAndSelect(0);
but when i click open the combobox dropdown it still shows dropdown display from bottom as shown below
...
"X"
"Y"
"Z"
I am unable to post images for representing combobox values, so has put in above examples.
This looks like a graphics bug to me or am I doing something wrong?
I have seen similar issue reported in below question but no work around suggested so far
Combobox clearing value issue
If you want to simply "reset" the combo box, I think all you have to do is set the value to null, like so:
sourceComboBox.setValue(null);
I ran into nearly the exact same situation and came across your question while looking for a solution. Fortunately, I came up with a workaround that forces the ComboBoxes to reset. When you reset the data on your pane, instead of doing something like:
sourceComboBox.getSelectionModel().clearSelection();
sourceComboBox.getItems.clear();
do something like this...
parentNode.getChildren().remove(sourceComboBox);
sourceComboBox= new ComboBox(); // do whatever else you need to format your ComboBox
parentNode.add(sourceComboBox);
You'll also need to do a setItems() again on your ComboBox so the new one will be populated. This is not an ideal solution but it seems to be working as I expect the provided clearSelection() method would.
Below is the code you're looking for. It will reset it to whatever index you give in within the parenthesis.
sourceComboBox.setSelectedIndex(0);
Goodluck
Most of the things were giving me an error when I tried them. What worked best for me was to use this
comboBox.getSelectionModel.clearSelection();
This will essentially set the value of your ComboBox to null. Because of this, if you are referring to the value of the ComboBox in another place, it becomes important to check for whether the value of the ComboBox is null using this
if(comboBox.getValue() != null)
//Code segment here
The ComboBox control has not a method like scrollTo(index) of the ListView. So it seems hard to workaround that behavior. You can issue a feature request at JavaFX Jira.
I made a list of arrays using JSON and display it as links. Now, I have textboxes below the lists where the array list item would appear if it was clicked. How would I update the value of the array list item if I changed it on the textbox and clicked on save so that even if the page is refreshed, the new data should appear on the list instead of the old one.
By the way, the codes for the array, displaying the array, the textboxes and buttons are all in the same html page.
To start with, you can use JSON.stringify on the array object and put it in the text box. After manual editing, apply it to the array using JSON.parse.