Hello Paul;
I find that a good way to deal with this sort of thing is to override
"takeValuesFromRequest", call super, and then jiggle the data about
afterwards to suit. Trying to depend on the sequence of elements on
the page can become a fragile solution if the page design changes.
cheers.
Say I have the following in a HTML template:
<wo:WOPopUpButton ... selection="$answerSelection" ... />
<wo:WOTextField value="$otherValue" ... />
That is, the WOTextField is rendered after the WOPopUpButton.
Experimentally, it looks like setAnswerSelection() is being called
before setOtherValue() every time---can I rely on this behaviour?
In case the answer is no, here's the background. I have a
WOPopUpButton that displays a list of choices, as well as a
noSelectionString. The user can make a choice from the list, or
supply an "other" value in the WOTextField, but they're mutually
exclusive. I've put some Javascript on the page that does the
following:
1. On the textfield's onchange event, the JS sets the pop-up to
selectedIndex = 0, selecting the noSelectionString.
2. On the pop-up's onchange event, the JS clears the value in the
textfield.
In Safari, at least, the JS is not reliable: specifically, if I
accept an auto-completion from Safari's history, then the onchange
event doesn't seem to fire, and I get a non-null selection in the
pop-up, as well as text in the textfield. As a workaround, I was
going to have setOtherValue() reverse the work done in
setAnswerSelection() if the former is supplied with a non-null value.
To be honest, the whole approach seems a bit baroque, so if someone
wants to suggest something better instead of answering the initial
question, that would also be fine. :-)
___
Andrew Lindesay
www.lindesay.co.nz
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