hi
Is there a neat way to update a section of a web page when working
with Java and GAE? And passing parameters (e.g. To load data from the
datastore according to some criteria)?
I want to show a second drop down list (<select> tag) depending on the
selection done on the first dropdown (<select> tag). E.g. First drop
down selects the customer, second drop down selects the order, all on
the same screen.
I thought of two ways to do this... Both a little bit cumbersome and
my instinct tells me there MUST be a cleaner way to do things.
Both methods use the HTML 5 object tag (or iframe tag) and onChange of
the first dropdown, I change innerHTML of the object tag to load the
2nd sub-page (containing the 2nd <select> tag). However to pass
parameters from the first page to the second using this approach I
must either build and call a form using Java/JavaScript (to pass
parameters using POST method) or else save the parameter into the
datastore from within the first page, and then read this parameter
from the 2nd sub-page. And then build the <select> tag using this
parameter.
I cannot simply use .innerHTML='<select><option value="">etc...'
because I get problems (I think) with too many single and double
quotes when building the first page
(resp.getwriter().println(".... .innerHTML ='<select><option value=
\"\">etc...'.
Setting innerHTML to simple text without using <> and quotes works
fine. I will try to post code later from my development PC.
Thanks for any ideas you may have!
T
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