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How to display line numbers in a JSF table?

I have this JSF table. I want to add line numbers.

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:ui="http://java.sun.com/jsf/facelets" > <h:head> <h:outputStylesheet library="css" name="table-style.css" /> </h:head> <h:body> <h1>JSF 2 dataTable example</h1> <h:form> <h:dataTable value="#{order.orderList}" var="o" styleClass="order-table" headerClass="order-table-header" rowClasses="order-table-odd-row,order-table-even-row" > <h:column> <f:facet name="header">No</f:facet> <h:inputText value="#{order.orderList.rowIndex + 1}" size="10" rendered="false" /> <h:outputText value="#{order.orderList.rowIndex + 1}" rendered="#{not order.orderList.rowIndex + 1}" /> </h:column> <h:column> <f:facet name="header">Order No</f:facet> <h:inputText value="#{o.orderNo}" size="10" rendered="#{o.editable}" /> <h:outputText value="#{o.orderNo}" rendered="#{not o.editable}" /> </h:column> <h:column> <f:facet name="header">Product Name</f:facet> <h:inputText value="#{o.productName}" size="20" rendered="#{o.editable}" /> <h:outputText value="#{o.productName}" rendered="#{not o.editable}" /> </h:column> <h:column> <f:facet name="header">Price</f:facet> <h:inputText value="#{o.price}" size="10" rendered="#{o.editable}" /> <h:outputText value="#{o.price}" rendered="#{not o.editable}" /> </h:column> <h:column> <f:facet name="header">Quantity</f:facet> <h:inputText value="#{o.qty}" size="5" rendered="#{o.editable}" /> <h:outputText value="#{o.qty}" rendered="#{not o.editable}" /> </h:column> <h:column> <f:facet name="header">Action</f:facet> <h:commandLink value="Edit" action="#{order.editAction(o)}" rendered="#{not o.editable}" /> </h:column> </h:dataTable> <h:commandButton value="Save Changes" action="#{order.saveAction}" /> </h:form> </h:body> </html> package com.mkyong; import java.io.Serializable; import java.math.BigDecimal; import java.util.ArrayList; import java.util.Arrays; import javax.faces.bean.ManagedBean; import javax.faces.bean.SessionScoped; @ManagedBean(name="order") @SessionScoped public class OrderBean implements Serializable{ private static final long serialVersionUID = 1L; private static final ArrayList<Order> orderList = new ArrayList<Order>(Arrays.asList( new Order("A0001", "Intel CPU", new BigDecimal("700.00"), 1), new Order("A0002", "Harddisk 10TB", new BigDecimal("500.00"), 2), new Order("A0003", "Dell Laptop", new BigDecimal("11600.00"), 8), new Order("A0004", "Samsung LCD", new BigDecimal("5200.00"), 3), new Order("A0005", "A4Tech Mouse", new BigDecimal("100.00"), 10) )); public ArrayList<Order> getOrderList() { return orderList; } public String saveAction() { //get all existing value but set "editable" to false for (Order order : orderList){ order.setEditable(false); } //return to current page return null; } public String editAction(Order order) { order.setEditable(true); return null; } public static class Order{ String orderNo; String productName; BigDecimal price; int qty; boolean editable; public Order(String orderNo, String productName, BigDecimal price, int qty) { this.orderNo = orderNo; this.productName = productName; this.price = price; this.qty = qty; } public boolean isEditable() { return editable; } public void setEditable(boolean editable) { this.editable = editable; } public String getOrderNo() { return orderNo; } public void setOrderNo(String orderNo) { this.orderNo = orderNo; } public String getProductName() { return productName; } public void setProductName(String productName) { this.productName = productName; } public BigDecimal getPrice() { return price; } public void setPrice(BigDecimal price) { this.price = price; } public int getQty() { return qty; } public void setQty(int qty) { this.qty = qty; } } }

I added #{order.orderList.rowIndex + 1} to count the rows and display them. But when I launch the JSF page, I get this error:

 java.lang.NumberFormatException: For input string: "rowIndex" at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) at java.lang.Integer.parseInt(Integer.java:481) at java.lang.Integer.parseInt(Integer.java:514) at javax.el.ListELResolver.toInteger(ListELResolver.java:409) at javax.el.ListELResolver.getValue(ListELResolver.java:202) at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) at com.sun.el.parser.AstValue.getValue(AstValue.java:138) at com.sun.el.parser.AstValue.getValue(AstValue.java:183) at com.sun.el.parser.AstNot.getValue(AstNot.java:63) at com.sun.el.parser.AstPlus.getValue(AstPlus.java:59) at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:224) at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) at javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:413) at javax.faces.component.UIData.iterate(UIData.java:1993) at javax.faces.component.UIData.processDecodes(UIData.java:1161) at javax.faces.component.UIForm.processDecodes(UIForm.java:225) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1176) at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1176) at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:933) at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231) at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) at com.sun.grizzly.ContextTask.run(ContextTask.java:71) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) at java.lang.Thread.run(Thread.java:679)

I think rowIndex not found. How can i fix this?

Hi

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2 answers

rowIndex is a <h:dataTable> property of the component itself, not its java.util.List value.

 <h:dataTable binding="#{table}" ...> <h:column>#{table.rowIndex + 1}</h:column> ... </h:dataTable>

The exception you received basically says that you are trying to access the List element using a row index such as orderList.get("rowIndex") , this is not valid. The only acceptable way to access the list item is to use a text binding of the type #{order.orderList[0]} , which resolves orderList.get(0) , but this is not what you need. Finally.

An alternative is to wrap orderList in a DataModel and indicate that instead of the value, for example

 <h:dataTable value="#{order.orderModel}" ...> <h:column>#{order.orderModel.rowIndex + 1}</h:column> ... </h:dataTable>

from

 private transient DataModel orderModel; public DataModel getOrderModel() { if (orderModel == null) { orderModel = new ListDataModel(orderList); } return orderModel; }

It should only be displayed for output. It makes no sense to display it in the input component, since it is impossible to set the sum as a single value. Also, using it in the rendered attribute, the path you did is invalid, as it does not return a boolean, but a long one.

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Another option is to use the List indexOf() method:

 <h:outputText value="#{order.orderList.indexOf(o) + 1}"/>
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Source: https://habr.com/ru/post/912075/

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