206606 - Selectbox with lots of options: Quick-Selection by typing first character of an option is not working

Status: NEW

(Core :: Layout: Form Controls, defect)

Description

[Patrick Davids]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4b) Gecko/20030507
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4b) Gecko/20030507

e.g. www.teamone.de/selfhtml Use the Quickbar and choose e.g. CSS. The right
Selectbox will get about 200 options... Try to select one by typing the first
character of an option.

Reproducible: Always

Steps to Reproduce:
1.
2.
3.

Actual Results:  
No Entry will be selected, blue selection is flickering.

Expected Results:  
Selecting an option with matching character

Comment 1

[Kyle Yuan]

Patrick, could you explain a little more about this bug? In what situation it 
will be failed by pressing the first letter?

Mozilla prefers the incremental search in selectbox, e.g. if you typed "abc" 
quickly (<1 sec between every typing), mozilla will try to match the item 
begins with "abc" rather than match 3 items "a..." "b..." "c..." in sequence. 

Please see the following bugs for reference:
bug 150590, bug 177965, bug 188199 

Comment 2

[Patrick Davids]

When I'm typing just one letter, I do not get a selected option. I need to press
e.g. the letter "p" twice, to get a selection for the word "pizza" at the
pulldown box. If I only press it once, the word "pizza" is shown on the top of
the select box, but the selection at the pulldown box is still missing.

Comment 3

[Kyle Yuan]

then could you please give a new test case? the one in comment 0 does not work
for me.

Comment 4

[Jerry]

Attachment: testcase

Comment 5

[Patrick Davids]

Your short testcase selectbox is working fine...

Try this one:
http://selfhtml.teamone.de/navigation/quickbar/liste_css.htm

There are a bit more options. I think it depends on the amount of options...

Comment 6

[Jerry]

not, the testcase I posted is a good testcase.

you can press 'A', then press 'N' to see it.
   

Comment 7

[Kyle Yuan]

Jerry, see my comment 1, if the interval between typing 'a' and 'n' is less than
1 sec, we will try to match 'an...', not 'n...'

Comment 8

[Kyle Yuan]

Patrick, thanks for the test case, now I understand what the problem is.

ccing jkeiser.

Comment 9

[Kyle Yuan]

By a simple investigation, I found the nsScrollPortView::ScrollTo got called 
twice after a matched item was found - once with the correct offset, another 
with (0, 0). That also can explain why the listbox was shaking.

changing component & owner...