>> I'm struggling to create a binding to a UIInput element in a DataTable row. >> (Context: I'm trying to do validation across multiple fields in the same >> row.) >> ... >> I have a backing bean for the main page (PlayBB; managed-bean-scope: >> "session") which contains a List of backing beans for each row (NameBB; >> managed-bean-scope: "none"). I've observed (through logging) that the >> binding occurs exactly once per page and not once per row as I had >> expected.
>No, this is expected behavior. Your UIInput only exists once, but it >has as many states as rows in the table. This is where you need to >call UIData.setRowIndex(row) in order to put the UIInput into the >correct state. Thanks. Just to finish this thread, here's what I had to do. My above attempt was to bind each row element to a UIInput in my row object. However, since there is really only one UIInput in multiple states, I need to bind the row column to a UIInput in the overall backing bean. I also need to bind the DataTable to a UIData in the backing bean. I can have a hidden field after the table with a validator in the backing bean in order to validate the rows. I thus have access to the UIData object (for getRowCount() and setRowIndex()) and the UIInput values. Code example below, for anyone stumbling across this thread in the future! -David- ---------play.jsp--------- <%@ taglib uri="http://java.sun.com/jsf/html"; prefix="h" %> <%@ taglib uri="http://java.sun.com/jsf/core"; prefix="f" %> <html> <head><title>JSF Play</title></head> <body> <f:view> <h:form id="form"> <h:commandButton value="Add Names" type="submit" action="#{play.addNames}"/> <h:dataTable id="names" value="#{play.nameBBList}" var="name" binding="#{play.tableData}" > <h:column> <h:inputText id="first" value="#{name.first}" maxlength="10" size="10" binding="#{play.firstInput}" /> <h:inputText id="last" value="#{name.last}" maxlength="10" size="10" binding="#{play.lastInput}" /> </h:column> </h:dataTable> <h:inputHidden id="datacheck" validator="#{play.validateNames}" value="dummy"/> </h:form> </f:view> </body></html> ---------play.jsp--------- ---------PlayBB.java--------- package jsfplay; import java.util.*; import javax.faces.component.*; import javax.faces.context.*; import javax.faces.validator.*; import javax.faces.application.*; public class PlayBB { private UIInput firstInput; private UIInput lastInput; private UIData table; private List<NameBB> nameBBList=new ArrayList<NameBB>(); public PlayBB(){ } public int getNumberOfNames() { return nameBBList.size(); } public List<NameBB> getNameBBList() { return nameBBList;} public String addNames() { // fill in some names. NameBB newName = new NameBB("Joe","Smith"); nameBBList.add(newName); newName = new NameBB("Ralph","Johnson"); nameBBList.add(newName); return null; } public void setFirstInput(UIInput firstInput) { this.firstInput=firstInput; } public UIInput getFirstInput() {return firstInput; } public void setLastInput(UIInput lastInput) { this.lastInput=lastInput; } public UIInput getLastInput() {return lastInput; } public void setTableData(UIData table) { this.table=table; } public UIData getTableData() {return table; } public void validateNames(FacesContext context, UIComponent toValidate, Object value) throws ValidatorException { for(int i=0; i<table.getRowCount(); ++i) { table.setRowIndex(i); // Now do validation comparing firstInput.getValue() and // lastInput.getValue() } } } ---------PlayBB.java--------- ---------NameBB.java--------- package jsfplay; import javax.faces.component.*; public class NameBB { //properties private String first=""; private String last=""; public NameBB(){ } public NameBB(String first, String last) { this.first=first; this.last=last; } public String getFirst() {return first;} public String getLast() {return last;} public void setFirst(String first) {this.first=first;} public void setLast(String last) {this.last=last;} } ---------NameBB.java--------- -- View this message in context: http://www.nabble.com/Binding-to-elements-in-DataTable-tf2041529.html#a5621639 Sent from the MyFaces - Users forum at Nabble.com.
