What is the best way to override the tab order in a web page?
I'm trying to implement a zoom mode for part of a form, so when the zoom
button is pressed that section of the form is resized to fill the entire
browser window. While the user is in the zoom mode I want to stop the tab
key taking them on to the next (now invisible) tabstop on the page. Ideally
I want tabbing to wrap round so that tabbing forward from the last of the
zoomed controls takes me to the first zoomed control, and tabbing back from
the first takes me to the last zoomed control. I have no control over what
appears elsewhere on the webpage.
I can think of a variety of ways to achieve this:
I could modify tabindex so that when focus is in the last zoomed control,
the first zoomed control has the next tabindex and when focus is in the
first zoomed control its original tabindex is restored.
I could set a negative tabindex on all other tabstops on the page, but this
gets messy if any tabstops already have a negative tabindex and it is quite
a lot of work.
I could intercept the tab key and try to force its behaviour.
Any suggestions which of these (or any other) technique is most likely to
work?
2  4388 
Duncan Booth wrote: What is the best way to override the tab order in a web page?
[...]
If you really must do this, trapping the tab key and manually moving
the focus to the next element is probably best but please look
carefully at the usability issues first. Presumably the "un-zoom"
button will be one of the tab-navigable elements.
You can dynamically change the tabIndex property, but I think the logic
of trying to trap users in the one set of controls would drive you (and
your visitors) mad.
I could modify tabindex so that when focus is in the last zoomed control,
the first zoomed control has the next tabindex and when focus is in the
first zoomed control its original tabindex is restored.
The behaviour of negative numbers may be unreliable, the spec does not
say how they should be treated, but it does say:
This value must be a number between 0 and 32767
<URL:
http://www.w3.org/TR/1998/REC-html40-19980424/interact/forms.html#adef-tabindex>
but I was able to get Safari to follow an order using negative numbers.
Cheers, Fred.
Fred Oz wrote: Duncan Booth wrote: What is the best way to override the tab order in a web page? [...]
If you really must do this, trapping the tab key and manually moving
the focus to the next element is probably best but please look
carefully at the usability issues first. Presumably the "un-zoom"
button will be one of the tab-navigable elements.
You can dynamically change the tabIndex property, but I think the
logic of trying to trap users in the one set of controls would drive
you (and your visitors) mad.
Naturally the un-zoom button will be tab navigable. It wouldn't be much of
a user interface if it weren't. The point of doing this is that I think the
users will go a bit crazy if they can tab to controls which aren't visible
and zooming hides *everything* except the one area of the form.
A bit more information: I'm adding this zoom functionality to Kupu which is
a wysiwyg editor, so the controls visible when zoomed are a toolbar with
all the usual word processing functions and the rest of the window gets
filled with an iframe containing the contentEditable or designMode
document. In normal mode you have the toolbar and iframe in the middle of a
page which results in a slightly unpleasant interface as you have separate
scrollbars for the page and for the iframe.
It is still very much a speculative enhancement since I'm not sure to what
extent I can get something that works cleanly and intuitively, but so far
it looks pretty promising.
...
The behaviour of negative numbers may be unreliable, the spec does
not say how they should be treated, but it does say:
...
Thanks, that's exactly why I posted the question. I thought there were
bound to be people who knew reasons why some of my options are non-
starters. Scratch negative indexes, not that I liked that idea much anyway. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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