Yeah, that's a very good point. I would actually probably do it that way,
also. I had written up a little tag that lets you pass an array ID and
value and it generates the option list for you, with the item with the
indicated value selected, but I don't have the code for that handy...
I think what it comes down to is, once you've got the basic functionality
built out, there are a LOT of ways to clean and streamline this sort of
code. Getting the BeanUtils working with it makes the processing really
slick (although figuring out the syntax can be a bit of a nightmare!). If
I can ever find my stupid sandbox app with this functionality in it, I'll
repost it.
[EMAIL PROTECTED] wrote:
> Just something I use...
>
> Rather than
>
> <option value="A"<c:if test="${item.code == 'A'}">
> selected</c:if>>A</option>
>
> I tend to use EL for the conditional to determine the selected item with
>
> <option value="A" ${item.code eq "A" ? " selected " : ""}>A</option>
>
> This way the < > 's all match up so if you're using any html designer it
> wont be effected.
>
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Rick
> Herrick
> Sent: Monday, October 02, 2006 9:00 PM
> To: displaytag-user@lists.sourceforge.net
> Subject: Re: [displaytag-user] Dropdown selection - displaytag 1.0
>
> Rick Herrick wrote:
>> Reg Sherwood wrote:
>>> I'm faced with an interesting problem - I am using displaytag 1.0
>>> (non
>>> el) combined with struts 1.2.9. I have a table with a number of
>>> columns and rows; all columns are static display data except for the
>>> last which is a dropdown box where the user can modify a value
>>> associated to the given row (think of it as a status column). What I
>>> want to know is if its possible on form submission to somehow figure
>>> for each row in the displaytag the currently selected value of the
>>> dropdown. Anyone have suggestions? All are welcomed.
>>
>> I do. I'll post it up later.
>>
>> This is YAF (yet another FAQ :).
>
> OK, apologies for the delay. On top of a sick daughter, a wife leaving
> town
> on a business trip, and a catastrophic hard drive failure... I've been
> kinda
> busy lately!
>
> So I'm gonna write up the Fred Flintstone method for handling drop-down
> lists in forms with displaytag. I'll give you some pointers later on how
> to
> do this more elegantly. Also, I'm writing this using Java 5/JSP 2.4
> in-line
> EL. For older set-ups (JSP 2.3 and earlier) you'll have to use JSTL tags.
> This is a silly example, with a person's name and the ability to set a
> code
> for the person.
>
> First, set up a form with the displaytag table inside it:
>
> <form action="xxx">
> <display:table name="items" uid="item">
> <display:column property="name"/>
> <display:column title="Code">
> <select name="code_${item.id}">
> <option value="A"<c:if test="${item.code == 'A'}">
> selected</c:if>>A</option>
> <option value="B"<c:if test="${item.code == 'B'}">
> selected</c:if>>B</option>
> <option value="C"<c:if test="${item.code == 'C'}">
> selected</c:if>>C</option>
> </select>
> </display:table>
> <input type="submit"
> </form>
>
> So what will happen with this is that the list will be iterated, the name
> will be displayed, and for each item the code_XXXX drop-down list will be
> created. The <c:if>s inside the option list will check each user to see
> what code is set for the user and add "selected" to the appropriate option
> in the list.
>
> Processing this as it's reposted is simply a matter of find all request
> parameters that begin with "code_". Grab those, lop off the "code_" and
> that'll give you the item ID to which that selection applies. Get the
> value
> of the list and set the code property on that item to whatever value you
> got.
>
> Like I said, this is the Fred Flintstone way of dealing with it. You're
> out
> there munging strings together and parsing them out and it's fairly ugly.
> There are many ways to streamline this:
>
> * Take the options in your drop-down list from an enum or string array.
> You can then just do a <c:iterate> on that enum or array and collapse the
> code for the drop-down list. This is especially useful when you might
> have
> a pretty large number of items in that list.
>
> * Use the BeanUtils library! This is a big one, although it can be kinda
> hard to figure out. Basically instead of doing "code_XXXX" and having to
> parse the request parameter names, you do something like "code[XXXX]" and
> objects will get magically referenced properly. Somewhere I have a nice
> sandbox app that illustrates this, but I couldn't find it over the weekend
> (catastrophic hard drive failure, remember? :^( ).
>
> Drop a line to the list if you have any questions!
>
> --
> Rick Herrick
> [EMAIL PROTECTED]
>
> Proud member of the reality-based community
>
> Never try to discourage thinking for you are sure to succeed.--Bertrand
> Russell
>
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--
Rick Herrick
[EMAIL PROTECTED]
Proud member of the reality-based community
Never try to discourage thinking for you are sure to succeed.--Bertrand
Russell
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