JSF dropdown with BigInteger keys
We wanted to create a drop down with JSF which had keys as java.math.BigInteger and labels as strings. The drop down was to be pre selected with a value. If everything is string, string, thinds work well. However, the drop down value is not prepopulated if it is bound to a BigInteger. Eventually, we were able to solve this with the following code:
JSP
Managed Bean
DTO
JSP
<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\"
\"http://www.w3.org/TR/html4/loose.dtd\">
<%@ page contentType=\"text/html;charset=windows-1252\"%>
<%@ taglib uri=\"http://java.sun.com/jsf/html\" prefix=\"h\"%>
<%@ taglib uri=\"http://java.sun.com/jsf/core\" prefix=\"f\"%>
<f:view>
<html>
<head>
<meta http-equiv=\"Content-Type\"
content=\"text/html; charset=windows-1252\"/>
<title>ConversionTrial</title>
</head>
<body><h:form>
<h:selectOneMenu id=\"menu\" value=\"#{ConversionBean.dto.code}\">
<f:selectItems value=\"#{ConversionBean.valueList}\"/>
</h:selectOneMenu>
</h:form></body>
</html>
</f:view>
Managed Bean
package view;
import java.math.BigInteger;
import java.util.ArrayList;
import javax.faces.model.SelectItem;
public class ConversionBean {
private DTO dto;
private ArrayList valueList;
public ConversionBean() {
dto = new DTO(new BigInteger(\"10\"), \"Large\");
}
public ArrayList getValueList(){
valueList = new ArrayList();
valueList.add(new SelectItem(new BigInteger(\"0\"), \"Small\"));
valueList.add(new SelectItem(new BigInteger(\"5\"), \"Medium\"));
valueList.add(new SelectItem(new BigInteger(\"10\"), \"Large\"));
return valueList;
}
public DTO getDto(){
return this.dto;
}
}
DTO
package view;
import java.math.BigInteger;
public class DTO {
private BigInteger code;
private String val;
public DTO(BigInteger code, String val) {
this.code = code;
this.val = val;
}
public void setCode(BigInteger s){
System.out.println(\"setCode to \" + s);
this.code = s;
}
public BigInteger getCode(){
System.out.println(\"getCode returns \" + code);
return this.code;
}
}
posted by Sonal at 5:02 PM
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