Doug Shackelford wrote:
While doing Lab3 AA (dot notation), I had some problems getting multi-row update to work on the taskListMR page after I nested the tasks inside a project. I only have one question at the end, but I thought I would post my journey in case it would be helpful to other students.
Note: this post is a spoiler, so if you haven't done Lab AA, then I wouldn't read it. By the way, I highly recommend this lab. It forced me to a much greater understanding of what is going on.
After Lab 2, my MRTaskList.jsp looked something like this. The formBean (fb) was a TaskBean.
<c:forEach var="row" items="${fb}">
<tr>
<td>
<c:url value="taskEdit" var ="url">
<c:param name="ID" value="${row.id}"/>
<c:param name="Dispatch" value="Edit"/>
</c:url>
<a href ='<c:out value="${url}"/>' > <fmt:message key="button.edit"
bundle="${loc}"/>
</a>
</td>
<td>
<html:text styleClass="form" property="name"
size="20" name="row" indexed="true"/>
</td>
</tr>
</c:forEach>
After nesting, the formBean (fb) became a ProjectBean with tasks. Accordingly, I changed the <c:forEach> to be:
<c:forEach var="row" items="${fb.tasks.displayList}">
This, of course, didn't work, so I changed the var to "tasks". This gave me this:
<c:forEach var="tasks" items="${fb.tasks.displayList}"> <tr> <td> <c:url value="taskEdit" var ="url"> <c:param name="ID" value="${tasks.id}"/> <c:param name="Dispatch" value="Edit"/> etc.
This didn't work either, so I changed it to
<c:forEach var="tasks.row" items="${fb.tasks.displayList}">
At first, I didn't understand why this helped. Now, I do. This really helped me to understand.
Above should work! Is it easy for you to send me the sample code? .V
Unfortunately, I still had a problem with my "Edit" URL. It wasn't
populating the ID. Everything else worked. I tried many variations
such as:
<c:param name="ID" value="${tasks.row.id}"/>
I guess this doesn't work because "tasks.row" is not a valid variable
name.
Eventually, I got it working by using <bean:write>, as follows:
<c:param name="ID"> <bean:write name="tasks.row" property="id"/> </c:param>
Given that we should avoid the bean tags in favor of JSTL, is there any way to do this without using <bean:write>?
Thanks for any thoughts.
--Doug
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