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From "John Martin" <john.martin...@virgin.net>
Subject Re: Map backed ActionForm, and jstl expression language
Date Fri, 02 Jul 2004 00:03:44 GMT
Sorry wrong User List, it is quite late....

----- Original Message ----- 
From: "John Martin" <john.martin700@virgin.net>
To: "tomcat-user" <tomcat-user@jakarta.apache.org>
Sent: Friday, July 02, 2004 1:00 AM
Subject: Map backed ActionForm, and jstl expression language


Hi all,

Any help on the following problem would be most appreciated.

What i am trying to do is produce a report of data in tabular form with
filters that will reduce the report set. There can be 100's of different
reports but by passing in a report id to a database the query, filters,
columns and row values can be determined.

So i use a map backed action form for the filter property and there values,
this contains the methods

  public void setValue(String key, Object value) {
        values.put(key, value);
    }

    public Object getValue(String key) {
        return values.get(key);
    }

For example, i want the first filter to have a value of 1, so i
setValue("filter1","1") and the second filter to be value 2
(setValue("filter1","1")).

Now i populate another bean with the filter labels and values, that gets
stored in the request. These are filter lists are stored as array lists in a
hashmap with the the key, being the filter property, in this case "filter1"
and "filter2".

So in the jsp i write
      <c:forEach items="${dao.hmOfLists}" var="list">
       <c:set var="props" value="${list.key}"/>
       <c:set var="values" value="${list.value}"/>
      <html-el:select property="${props}" value="">
        <html:options collection="values" property="value"
labelProperty="label"/>
      </html-el:select>
      </c:forEach>

this gets me the all the filters that have been stored in the hashmap from
the object "dao" via the property hmOfLists, with the key in the hashmap
being the filter property. However, i want to set the defaults on the
filters via the map backed action form, but if i write <html-el:select
property="${props}" >, i get an error of "No getter method available for
property filter2......etc". So i try an access the value, in the
html-el:select using the expression value="${testForm.props}", but this
shouldn't (and doesn't work) as label is actually the variable props from
the hashmap, not the property props from the testForm. How i can i make it
use the var props instead of the string literal, in order to determine the
property to retrieve from the map based action form ?

Thanks,

John







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