i want to change all scriptlets in my jsp pages to jstl, how can i change this code to jstl
<% Map validationResults = (HashMap) request.getAttribute("validationResults");%>
<% if (validationResults != null) {
if (validationResults.containsKey("userName")) { //how can i chage this line to jstl ?
%>
<%=((ValidationResult) (validationResults.get("userName"))).getDetails()%> //how can i chage this line to jstl too ?
<%}%>
<%}%>
MY JSTL
<c:set var="validationResults" value="validationResults" scope="request"></c:set>
<c:if test="validationResults != null">
//how can i change the code of map here?
</c:if>
and another problem with ArrayList which contains list of Group object , in the loop i want to get each Group object and check a specific method inside Group object , how can I reach to these method through jstl??
I want to change this开发者_如何学运维 code
<%List<Group> allGroupList = new ArrayList<Group>();
allGroupList = (ArrayList) request.getAttribute("groups");%>
<% for (int index = 0; index < allGroupList.size(); index++) {%>
<%Group aGroup = (Group) allGroupList.get(index);%>
<label ><%=aGroup.getGroupEName()%></label>
<%if (aGroup.isIsUserGroup()) {%>
<input type="checkbox" name="group" value="<%=aGroup.getGroupNo()%>" CHECKED />
<%} else {%>
<input type="checkbox" name="group" value="<%=aGroup.getGroupNo()%>" />
<%}%>
<%}%>
here's my changed code:
<jsp:useBean id="GroupBean" class="ps.iugaza.onlineinfosys.entities.Group" type="ps.iugaza.onlineinfosys.entities.Group" scope="reqeust">
<c:set var="allGroupList" value="groups" scope="request"></c:set>
<c:forEach var="grp" items="${allGroupList}" varStatus="status">
//?????? what should i do ?
</c:forEach>
For The First Part
JSTL and EL only work with method that follows Java Bean convention. If you really wanna go this route, then you can loop around your map
.
<c:forEach items="${requestScope.validationResults}" var="mapEntry" varStatus="index">
<c:if test="${mapEntry.key == 'userName'}">
<tr>
<td>${mapEntry.value.details}</td>
</tr>
</c:if>
</c:forEach>
The other way can be just get userName
from the map, and check for if its null
or not, and then do whatever you like. This is indeed a better idea.
<c:if test="${requestScope.validationResults['userName'] != null}">
<tr>
<td>${requestScope.validationResults['userName'].details}</td>
</tr>
</c:if>
For The Second
<c:forEach var="grp" items="${requestScope.groups}" varStatus="status">
<label>${grp.groupEName}</label>
<input type="checkbox" name="group" value="${grp.groupNo}" ${grp.isUserGroup ? 'checked' : ''} />
</c:forEach>
As for no 1), You would have to populate your request
through an action/controller, and have a JSTL script that iterates through your map as follows:
Warning: Untested
<c:if test="${requestScope.validationResults != null}">
<c:forEach var="entry" items="${requestScope.validationResults}">
<c:if test="${entry.key == 'userName'}">
Result: ${entry.value.details};
</c:if>
</c:forEach>
</c:if>
Adeel Ansari answered number 2 for you.
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