Android Question B4XComboBox event SelectedIndexChanged

zed

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• Yesterday at 2:56 PM

• #2

If you want to trigger the action without using the event, perhaps you can call the method directly:

Call:

CallSubDelayed2(Me, "ComboBox1_SelectedIndexChanged", ComboBox1.SelectedIndex)

This should simulate the event without changing the index.

 

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andredamen

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• Yesterday at 5:45 PM

• #3

Unfortunately, that doesn't work. I fill the combo box and then delete, for example, item 3 (with index 2). The combo box is repopulated. If I then select the third item again (with index 2), the sub isn't executed because the index is 2 again and therefore hasn't changed. I'd like to fix that problem.
I clear the cmbobox with cmbbox.clear but there should also be a cmbbox.clearindex.

 

Last edited: Yesterday at 5:51 PM

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mangojack

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• Yesterday at 11:37 PM

• #4

After you delete an item, then repopulate the combobox, Call B4XComboBox.SelectedItem = -1.

Unsure how it affects your flow.

 

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andredamen

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• Today at 9:43 AM

• #5

Mangojack: selecteditem = -1 gives directly that selecteditem read only is.

 

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zed

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• Today at 10:29 AM

• #6

If the user clicks "Item 1" again while "Item 1" is already selected, the native control doesn't generate a new event.

There's no standard, clean, and portable way in B4X to "intercept" this additional click with B4XComboBox.
If you really need a reaction on every open/selection, even if the item remains the same, the solution would be to create a custom ComboBox using xCustomListView.

 

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P

PaulMeuris

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• Today at 12:06 PM

• #7

@mangojack probably meant: B4XComboBox1.SelectedIndex = -1
Can you put a log statement in the B4XComboBox1_SelectedIndexChanged (Index As Int) subroutine that shows the value of Index?
Did you remove the item in the B4XComboBox AND in the list that was used to populate the B4XComboBox?

 

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mangojack

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• Today at 12:14 PM

• #8

PaulMeuris said:

@mangojack probably meant: B4XComboBox1.SelectedIndex = -1

Click to expand...

Just noticed my typo ... Yes, should have been . SelectedIndex

Thought that if you cleared SelectedIndex, the Event would fire on subsequent same index selection.

Away from PC's for a couple of months (Bali ) ... So couldn't really check.

 

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andredamen

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• Today at 1:04 PM

• #9

Paul, I tried 2 ways: cmbLijst.cmbBox.RemoveAt(xx) and completely clear and the fill the combobox again. And like Zed said there is no intercept when I delete the second item (index 3) and after refilling the combobox and click again the new box at item 2 (index 3).

 

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andredamen

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• Today at 1:13 PM

• #10

I found a solution: I use cmbLijst_SelectedIndexChanged(-1) and in the sub cmbLijst_SelectedIndexChanged get away as fast as I can: If Index = -1 Then Return This works!

 

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