It seems i solved the issue i reported a couple of hours ago. I use javaObjectEDT (thanks for explaining that in your other post) on jSearchTextField before the setText invocation..

This is quite elegant. Unfortunately, there is a problem with Matlab hanging (matlab 2018b, windows 8.1) in the searchComboUpdated(obj, jCombo, eventData, hPanel) function. The hang occurs at jSearchTextField.setText(selectedItem). From other articles on your blog I learned that it could be EDT related and I hence added the drawnow; pause(0.1); that sometimes solves this. In this case it doesn’t help. In a newly started Matlab I get a hang everytime. It doesn’t hang in debug mode, but as soon as I run it without a breakpoint, it hangs. So frustrating.. and so unfortunate that Matlab has all these issues. I tried longer pause-times as well..didn’t help. Do you have any ideas?

Best,
Peter

PS: the code:

function searchComboUpdated(obj, jCombo, eventData, hPanel)
    ptime = 0.1;
    selectedItem = regexprep(char(jCombo.getSelectedItem),']*>','');  % strip away HTML tags
    fprintf('1');

    jSearchTextField = hPanel.UserData(2).getComponent(0);
    fprintf('2');
    drawnow; pause(ptime);

    str = java.lang.String(selectedItem);
    drawnow; pause(ptime);
    fprintf('2b');
    drawnow; pause(ptime);

    jSearchTextField.setText(str);
    drawnow; pause(ptime);
    fprintf('3');
    drawnow; pause(ptime);

    jSearchTextField.repaint; drawnow; pause(0.01);
    fprintf('4');

    jAssetChooser = getappdata(hPanel,'jAssetChooser');
    fprintf('5');

    obj.updateSearch([],[],jCombo,jAssetChooser);
    fprintf('6');
end  % searchComboUpdated

Hello together,

I am iteressted in the same point. I can implemement

set(handle(jPanelObj,'callbackproperties'), 'ActionPerformedCallback', @myMatlabCallbackFunc);
 

and this works fine, but with this callback I can not trigger on return or enter.

Do anybody have an idea to this topic.

Best Regards Stev

@Peter – My aim in this post, as in my entire blog, is to provide general guidelines, code snippets and sample output. I expect my readers to fill in the missing blanks. Admittedly, not all readers can do this, but I aim high, unapologetically. I rarely spoon-feed users with complete code programs. This would be quite beyond the scope of a typical blog post, or the amount of time that I can spend pro-bono. Remember that this blog has 400 articles, so if I had to spend a full day on each one, this would translate to almost two full work-years!

I have now added some extra code and explanations to the main text, which should be more than enough for most Matlab developers. If it’s still not enough for you, then consider asking a professional Matlab developer to assist you.

Thanks.

@Eric – read my answer above

I am trying to implement something very similar in a GUI I am making but after creating the Combo Box and running your above code, I am getting an error at the line:

assetClassIdx = getappdata(handles.cbAssetClass, 'assetClassIdx');

because there is no variable “handles.” What does this variable need to be?

Im having a problem with getting a keypress callback on R2015b for the simpe autocompletewidget:

strs = {'This','is','test1','test2'};
strList = java.util.ArrayList;
for idx = 1 : length(strs),  strList.add(strs{idx});  end
jPanelObj = com.mathworks.widgets.AutoCompletionList(strList,'');
javacomponent(jPanelObj.getComponent, [10,10,200,100], gcf);
set(handle(jPanelObj.getComponent,'callbackproperties'), 'KeyTypedCallback', @myMatlabCallbackFunc);

I would like to have this callback to register a ‘enter’ keystroke signifying a completed selection.

Any help would be greatly appreciated!

@Stefano – answering this is beyond the time that I can spend on a blog comment. You’re invited to email me (altmany at gmail) for a short consultancy on your specific program.

I’m trying to implement your Autocomplete widget in my GUI (more simple than yours).
I’ve decided to split the code to better understand it, but i have two problems:

1) I can’t select the word from the combobox dropdown panel or by typing in the search text-box

How can i do that? How can i get the selected word to use it?
I’ve tried with jAssetChooser.getSearchText or jCombo.getSelectedItem but it didn’t work.
Must i use the setappdata comand?

2) If the word doesn’t match with my the list i get this Java error:

Error using provaaa/updateSearch (line 94)
Java exception occurred:
java.lang.NullPointerException
	at javax.swing.DefaultComboBoxModel.(Unknown Source)

I’m using matlab 2016a.

This is my example code:
[*** very large code section removed ***]

Thanks in advance.
Stefano