Null item in a ComboBox

[sdc]

As said here (http://extjs.com/forum/showthread.php?p=324712), we cannot just add a null value in a ComboBox. I guess this feature would be useful for a lot of people, instead of handling a fake model representing a null value each time you allow a null value.

[sven]

This wont be added. It is completly against the structure of how combobox handles the data.

[sdc]

This wont be added. It is completly against the structure of how combobox handles the data.

It is also completely a part of what we could expect from a ComboBox... And it seems to be possible (set editable to true and type an empty value in the field do the job).

[sven]

This is something different as explained in the orginal thread.

[ivotte]

Hi,
i am not sure if replying to such a old thread will be noticed, but I have to agree with sdc that handling null in a combobox would be very useful for the daily work of many people. Of course, it is possible to add a model representing "null", but when this "null" model is selected, getValue() returns this model and not null. Then the programmer has to implement a special handling for this model, which is additional work. Also adding a "null" model itself is not done in a single line of code.

I think in many applications, selecting one item of a model list or selecting nothing is a very common use case (think of an nullable foreign-key column in a database). Is it not important to handle this conveniently?

[sven]

A ListStore does not even handle a null value. So there is no way to get it into a ComboBox. The only way would really be to have a model that represents null at the moment, or you need a button to clear the combobox (so that there is no value)