How to pass a server side value to an attribute of a custom jsp tag

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How to pass a server side value to an attribute of a custom jsp tag

 
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  #1
Jun 12th, 2007
Hi All:
I needed to passed an integer value from the following code:
<%=ic.getTotalNumOfRecords()%>
to an attribute of a custom tag
<inquiry:tableClaimHistory numberOfRecords="5" dataAction="claimHistoryViewData.do" emptyKey="error.noData"/>
The function getTotalNumOfRecords returns an int.
The attribute numberOfRecords expects an string.
Here are the different ways I tried in a jsp page but I get also the following errors:
1.)
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<%@ include file="../common/page_imports.jsp" %>
<inquiry:tableClaimHistory numberOfRecords=<%=ic.getTotalNumOfRecords()%> dataAction="claimHistoryViewData.do" emptyKey="error.noData"/>
Error Message:
claimHistoryView.jsp:190:3: Unterminated tag.
<inquiry:tableClaimHistory numberOfRecords=<%=ic.getTotalNumOfRecords()%> dataAction="claimHistoryViewData.do" emptyKey="error.noData"/>

2.)
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<%@ include file="../common/page_imports.jsp" %>
<inquiry:tableClaimHistory numberOfRecords="<%=ic.getTotalNumOfRecords()%>" dataAction="claimHistoryViewData.do" emptyKey="error.noData"/>
Error Message:
claimHistoryView.jsp:190:4: The required attribute "numberOfRecords" is missing.
<inquiry:tableClaimHistory numberOfRecords="<%=ic.getTotalNumOfRecords()%>" dataAction="claimHistoryViewData.do" emptyKey="error.noData"/>

3.)
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<%@ include file="../common/page_imports.jsp" %>
<inquiry:tableClaimHistory numberOfRecords="<%ic.getTotalNumOfRecords();%>" dataAction="claimHistoryViewData.do" emptyKey="error.noData"/>
Error Message:
java.lang.NumberFormatException: For input string: "<%ic.getTotalNumOfRecords();%>"

4.)
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<%@ include file="../common/page_imports.jsp" %>
<%
int records1 = ic.getTotalNumOfRecords();
Integer records2 = new Integer(records1);
String numberOfRecords2 = records2.toString();
%>
<inquiry:tableClaimHistory numberOfRecords="<%numberOfRecords2;%>" dataAction="claimHistoryViewData.do" emptyKey="error.noData"/>
error message:
java.lang.NumberFormatException: For input string: "<%numberOfRecords2;%>"
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1224)
at java.lang.Double.valueOf(Double.java:447)
at java.lang.Double.(Double.java:539)
at com.DisplayTableClaimHistoryTag.displayTable(DisplayTableClaimHistoryTag.java:63)

5.)
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<%
int records1 = ic.getTotalNumOfRecords();
Integer records2 = new Integer(records1);
String numberOfRecords2 = records2.toString();
%>
<inquiry:tableClaimHistory numberOfRecords=<%numberOfRecords2;%> dataAction="claimHistoryViewData.do" emptyKey="error.noData"/>
error message:
claimHistoryView.jsp:194:3: Unterminated tag.
<inquiry:tableClaimHistory numberOfRecords=<%numberOfRecords2;%> dataAction="claimHistoryViewData.do" emptyKey="error.noData"/>

In the custom tag java code called "DisplayTableClaimHistoryTag"
I tried to used the following code:
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InquiryContext ic = InquiryContext.getContext(session);
The problem is that in order to get session I needed HttpSession object. I don't know how to passed HttpSession "session" object
to a custom tag. Is there a way to do this?
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public class DisplayTableClaimHistoryTag extends InquiryTag
{
String numberOfRecords;
public void setNumberOfRecords(String numberOfRecords)
{
this.numberOfRecords = numberOfRecords;
}

public String getNumberOfRecords()
{
return numberOfRecords;
}

public int doStartTag()throws JspException
{

InquiryContext context = (InquiryContext)pageContext.getSession().getAttribute(Constrain.CONTEXT);
if(context==null)
throw new JspException(TAG_EXCEPTION+ "InquriyContext is null.");
String hasData = (String)context.getAttribute(Constrain.CONTROL_HAS_DATA);
if(hasData==null)
throw new JspException(TAG_EXCEPTION + "The hasData property can not be null.");
boolean hd = Boolean.valueOf(hasData).booleanValue();
Debug.println("hasData="+hd);
Debug.println("hasDataString="+hasData);
if(hd)
displayTable();
else
disPlayError();
return SKIP_BODY;
}
private void displayTable() throws JspException
{

String outString ="";
Debug.println("dispalyTable() ********* dataAction="+ dataAction);
JspWriter out = pageContext.getOut();
/*
* Minimum height height= 103,70
* 21.7 per row
* First row==103+21.5=124.5
* Second row ==103+21.5*2=146
* Third row ==103+21.5*3=167.5
*/
Double numberOfRecordsBigDouble = new Double(numberOfRecords);
double numberOfRecordsDouble = 70 + 21.8*numberOfRecordsBigDouble.intValue();
if(order==null || order.equals("0"))
// outString = "<iframe src=\"" + "/inquiry/" + dataAction + "?order=0"+ "\"" + " name=\"dataFrame\" id=\"dataFrame\" height=\""+numberOfRecordsDouble+"\"" +" width=\"100%\" scrolling=\"NO\" frameborder=\"0\"></iframe>";
// outString = "<iframe src=\"" + "/inquiry/" + dataAction + "?order=0"+ "\"" + " name=\"dataFrame\" id=\"dataFrame\" style=\"height:"+numberOfRecordsDouble+"px; width:100%\" scrolling=\"NO\" frameborder=\"0\"></iframe>";
// outString = "<iframe src=\"" + "http://www.google.ca"+ "\"" + " name=\"dataFrame\" id=\"dataFrame\" style=\"height:"+numberOfRecordsDouble+"px; width:100%\" scrolling=\"NO\" frameborder=\"0\"></iframe>";
outString = "<iframe src=\"" + "/inquiry/" + dataAction + "?order=0"+ "\"" + " name=\"dataFrame\" id=\"dataFrame\" style=\"height:"+numberOfRecordsDouble+"px; width:100%\" scrolling=\"NO\" frameborder=\"0\"></iframe>";

else
{
String orderStr = "?order=" + order;
outString = "<iframe src=\"" + "/inquiry/" + dataAction + orderStr + "\"" + " name=\"dataFrame\" id=\"dataFrame\" height=\""+numberOfRecordsDouble+"\"" +" width=\"100%\" scrolling=\"NO\" frameborder=\"0\"></iframe>";
//outString = "<iframe src=\"" + "/inquiry/" + dataAction + orderStr + "\"" + " name=\"dataFrame\" id=\"dataFrame\" height=\"161\" width=\"100%\" scrolling=\"NO\" frameborder=\"0\"></iframe>";
}
Debug.println("dispalyTable() ********* outString = "+ outString);

try {
out.println(outString);
} catch (IOException e) {
this.log.error(TAG_EXCEPTION + e.toString(), e);
throw new JspException(e);
}
}
Any hint would be greated appreciated.
Yours,
Frustrated
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Failure as a human

Re: How to pass a server side value to an attribute of a custom jsp tag

 
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  #2
Jun 12th, 2007
java Syntax (Toggle Plain Text) 
  1. <%
  2.    int records1 = ic.getTotalNumOfRecords();
  3.    Integer records2 = new Integer(records1);
  4.    String numberOfRecords2 = records2.toString();
  5.    %>
  6. <inquiry:tableClaimHistory numberOfRecords="<%= numberOfRecords2 %>" dataAction="claimHistoryViewData.do" emptyKey="error.noData"/>

Though this approach is not recommended and you are better off using JSTL to reduce the clutter and better separation of presentation and business logic.
Last edited by ~s.o.s~; Jun 12th, 2007 at 2:38 pm.
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duckman

Re: How to pass a server side value to an attribute of a custom jsp tag

 
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  #3
Jun 14th, 2007
in fact some JSP compilers will reject that code because it's so bad
As people are clearly allowed to attack me but I'm not allowed to defend myself, I no longer post to this site.
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