UI重复varStatus在CompositeComponent中不起作用 [英] UI Repeat varStatus not working in CompositeComponent
问题描述
我在WebSphere Application Server 8上使用JSF 2.0(Apache myFaces).
I use JSF 2.0 (Apache myFaces) on WebSphere Application Server 8.
我有一个包含图表列表的bean(jquery HighCharts的数据). 对于每个图表，我需要一些JSF组件+一个写为CompositeCompoent的Highchart包装器(
I have a bean which contains a list of charts (data for jquery HighCharts). For each chart I need some JSF components + one Highchart Wrapper written as CompositeCompoent (look here)
所以我像这样使用jsf 2的ui:repeat函数:
So I use the ui:repeat function of jsf 2 like this:
<?xml version="1.0" encoding="UTF-8" ?>
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns:hc="http://java.sun.com/jsf/composite/chartComponents"
template="/template/mytemplate.xhtml">
<ui:define name="content">
<ui:repeat value="#{chartCtrl.charts }" var="chart" id="chartrepeat" varStatus="chartStatus">
#{chartStatus.index }
<h:form id="chartform_#{chartStatus.index }">
<!-- some jsf select stuff-->
</h:form>
#{chartStatus.index }
<hc:Chart title="Statistics" id="hcchart_#{chartStatus.index }"
<!-- here's the problem-->
<ui:repeat value="#{chart.series }" var="serie">
<hc:ChartSeries series="#{serie.data }" />
</ui:repeat>
</hc:Chart>
#{chartStatus.index }
</p:panel>
</ui:repeat>
<h:outputScript library="js" name="highcharts.js" />
<h:outputScript library="js/modules" name="exporting.js" />
<h:outputScript library="js" name="jquery-1.9.1.min.js" target="head" />
</ui:define>
</ui:composition>
#{chartStatus.index}可以在所有地方工作，但不适用于hc:Chart id =". 此CC生成的js和div包含id'hcchart_chartdiv'.当前重复的索引向左.
The #{chartStatus.index } works every where but not in hc:Chart id="". The generated js and div by this CC contains the id 'hcchart_chartdiv'. The index of the current repeat left.
如何将正确的数字传递给id属性?
How can I pass the correct number to the id attribute?
复合组件
这是hc:Chart的一部分，应在其中使用ID
Here is a part of the hc:Chart where the ID should be used
<cc:implementation>
<div id="#{cc.id}_chartDiv" />
<!-- Highcharts -_>
<script type="text/javascript">
$(function() {
// Data must be defined WITHIN the function. This prevents
// different charts using the same data variables.
var options = {
credits : {
enabled : false
},
chart : {
renderTo : '#{cc.id}_chartDiv',
....
</script>
当我将hc:Chart中的属性ID保留为空时，则生成的ID类似于"j_id568185923_1_5f9521d0_chartDiv".但仍然没有:row:.
When I leave the attribute id in hc:Chart empty, then the generated ID is something like "j_id568185923_1_5f9521d0_chartDiv". But still without :row:.
IndexOf方法 我测试了另一种设置图表ID的方法.
EDIT 2: IndexOf Approach I tested another approach to set the ID of my chart.
id="hc_#{chartCtrl.charts.indexOf(chart) }"
我尝试使用ArrayList的IndexOf方法.我在所有类中实现了HashCode和Equals方法.当我测试它时，它工作正常. 但是当我将其与EL结合使用时，我会得到-1.
I tried to use the IndexOf method of my ArrayList. I implemented HashCode und Equals method in all Classes. When I test it, it works fine. But when I use it with EL I get -1 returned.
解决方案 就像BalusC所说的那样，我不能为EL使用ID标签.因此，我简单地在CC中创建了一个新属性.效果很好(就这么简单).
Solution Just as BalusC said I cant use the ID tag for EL. So I simple created a new attribute in my CC. That works fine (just so easy).
感谢BalusC.
有人有另一个主意吗?
推荐答案
在视图构建期间评估id属性. <ui:repeat varStatus>在视图渲染时间(在视图构建时间之后 之后)设置.本质上，您将遇到与此处详细说明的问题相同的问题:JSF2 Facelets中的 JSTL.合理吗?
The id attribute is evaluated during view build time. The <ui:repeat varStatus> is set during view render time which is after view build time. Essentially, you've the same problem as explained in detail here: JSTL in JSF2 Facelets... makes sense?
id属性中的任何EL表达式必须在视图构建期间可用.如果将<ui:repeat>替换为在视图构建期间运行的<c:forEach>，则必须正确设置id.一种替代方法是仅基于<ui:repeat varStatus>除去那些id属性中的EL. JSF将已经自动在<ui:repeat>子组件的ID后缀行索引.
Any EL expression in the id attribute must be available during view build time. If you replace <ui:repeat> by <c:forEach> which runs during view build time, then the id must be properly set. An alternative is to just get rid of EL in those id attributes based on <ui:repeat varStatus>. JSF will already automatically suffix the IDs of <ui:repeat> child components with the row index.
请注意，将<c:forEach>与视图范围的Bean结合使用并启用部分状态保存功能时，可能会产生无法预料的副作用.有关详细信息，请参见前面的答案.
Note that the <c:forEach> may have unforeseen side effects when used in combination with view scoped beans and partial state saving enabled. See the aforelinked answer for details.
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