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java - 如何在 JSF 表中显示行号？

转载 作者：塔克拉玛干 更新时间：2023-11-03 04:42:56 25 4
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我有这个 JSF 表。我想添加行号。

<?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;
        }
    }
}

我添加了 #{order.orderList.rowIndex + 1} 以计算行数并显示数字。但是，当我运行 JSF 页面时，出现此错误:

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)

我认为未找到 rowIndex。我该如何解决这个问题？

问候

最佳答案

rowIndex是 <h:dataTable> 的属性组件本身，而不是它的 java.util.List值(value)。

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

你得到的异常基本上是在告诉你正在尝试访问 List像这样的字符串索引 orderList.get("rowIndex") ，这是无效的。访问列表项的唯一有效方法是像这样使用大括号符号 #{order.orderList[0]}解析为 orderList.get(0) ，但这毕竟不是您所需要的。

另一种方法是包装 orderList在 DataModel 属性并将其作为值提供，例如

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

与

private transient DataModel orderModel;

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

它应该只显示为输出。在输入组件中显示它是没有意义的，因为不可能将总和设置为单个值表达式。还在 rendered 中使用它以您所做的方式归因是无效的，因为它不返回 boolean 值，而是一个长整数。

关于java - 如何在 JSF 表中显示行号？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9948854/

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