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<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<c:if test="${pageContext.request.method=='POST'}">
<c:choose>
<c:when test="${param.add!=null}">
<c:if test="${list!=null}">
<c:set var="list" value="${list}," scope="session" />
</c:if>
<c:set var="list" value="${list}${param.item}"
scope="session" />
</c:when>
<c:when test="${param.remove!=null}">
<c:set var="list2" value="" />
<c:forEach var="item" items="${list}">
<c:if test="${item!=param.item}">
<c:if test="${list2!=''}">
<c:set var="list2" value="${list2}," />
</c:if>
<c:set var="list2" value="${list2}${item}" />
</c:if>
</c:forEach>
<c:set var="list" value="${list2}" scope="session" />
<c:remove var="list2" />
</c:when>
</c:choose>
</c:if>
<html>
<head>
<title>Updatable Collections</title>
</head>
<body>
<table border="0">
<form method="post">
<tr bgcolor="blue">
<td colspan="2">
<font color="white">Updatable Collections</font>
</td>
</tr>
<tr>
<td valign="top">
<select NAME="choice" SIZE="5" width="20">
<c:forEach var="item" items="${list}">
<option>
<c:out value="${item}" />
</option>
</c:forEach>
</select>
</td>
<td valign="top">Enter a item to add or remove.
<br />
<input width="20" maxwidth="20" name="item" size="20" />
<br />
<input type="submit" name="add" value="Add" />
<input type="submit" name="remove" value="Remove" />
</td>
</tr>
</form>
</table>
</body>
</html>
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JSTL-Modify-a-collection.zip( 852 k)