myMap.get(myKey) with JSTL?

[Christine Mayer]

Hi, I need to get a map entry based on a key - how can this be done
using the JSTL?

I know I could say:
<c:forEach items="${myMap }" var="entry" >
<c:if test="${entry.key== myKey }">
</c:if>
</c:forEach>

but this seems pretty stupid to me.

Any idea how to solve this?

Thanks in advance,

Christine

 

[Lew]

Hi, I need to get a map entry based on a key - how can this be done
using the JSTL?

I know I could say:
<c:forEach items="${myMap }" var="entry" >
<c:if test="${entry.key== myKey }">
</c:if>
</c:forEach>

but this seems pretty stupid to me.

"${ myMap [myKey] }"
or
"${ myMap.myKey }"

 

[Christine Mayer]

This works:
<cut value="${myKey}"/> Output: E.g. 4711
<cut value="${myMap}"/> Output: The content of the entire object

This however does not work(empty output):
<cut value="${myMap['4711']}"/>
<cut value="${myMap[myKey]}"/>
<cut value="${myMap.myKey}"/>
<cut value="${myMap.'4711'}"/>

myMap contains a String key and a bean as value. The bean encapsulates
a list (that contains other beans again), that I later want to iterate
over. What I would like to achieve is something like:
<c:set value="${myMap[myKey]}" var="myBean"/>
<c:forEach items="${myBean.myList}" var="row">
<cut value="${row.myValue1}"/>
<cut value="${row.myValue2}"/>
<cut value="${row.myValue3}"/>
</c:forEach>

 

[Lew]

This works:
<cut value="${myKey}"/> Output: E.g. 4711
<cut value="${myMap}"/> Output: The content of the entire object

This however does not work(empty output):
<cut value="${myMap['4711']}"/>
<cut value="${myMap[myKey]}"/>
<cut value="${myMap.myKey}"/>
<cut value="${myMap.'4711'}"/>

myMap contains a String key and a bean as value. The bean encapsulates
a list (that contains other beans again), that I later want to iterate
over. What I would like to achieve is something like:
<c:set value="${myMap[myKey]}" var="myBean"/>

Odd. According to

To refer to properties of a bean or an Enum instance, items of a
collection, or attributes of an implicit object,
you use the . or [] notation, which is similar to the notation used by ECMAScript. ....
In contrast, an item in a Map can be accessed using a string literal key; no coercion is required:

${customer.orders["socks"]}

.... and

${departments[deptName]}
The value of the entry named deptName in the departments map.

 

[Daniel Pitts]

This works:
<cut value="${myKey}"/> Output: E.g. 4711
<cut value="${myMap}"/> Output: The content of the entire object

This however does not work(empty output):
<cut value="${myMap['4711']}"/>
<cut value="${myMap[myKey]}"/>
<cut value="${myMap.myKey}"/>
<cut value="${myMap.'4711'}"/>

myMap contains a String key and a bean as value. The bean encapsulates
a list (that contains other beans again), that I later want to iterate
over. What I would like to achieve is something like:
<c:set value="${myMap[myKey]}" var="myBean"/>
<c:forEach items="${myBean.myList}" var="row">
<cut value="${row.myValue1}"/>
<cut value="${row.myValue2}"/>
<cut value="${row.myValue3}"/>
</c:forEach>

what about ${myMap[4711]}?
If it is a String key, make sure that myKey is also a String.
Where does myKey come from? Might it be better to have whatever
constructs your model pull the value out of the map?

It should work the way you've tried, unless there is something else
going on.

 

[Christine Mayer]

Finnally, it worked out - it turned out that "A" != "a"!!!!!!! ;-)

Thx, Christine

 

[Lew]

Finnally, it worked out - it turned out that "A" != "a"!!!!!!! ;-)

Was this something that turned up in a key comparison?

 

[Daniel Pitts]

Finnally, it worked out - it turned out that "A" != "a"!!!!!!! ;-)

Thx, Christine

Uh, yeah. That's always been true with Java .