Java 使用 JSTL forEach 循环的 varStatus 作为 ID
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/6600738/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Use JSTL forEach loop's varStatus as an ID
提问by Mark W
I want to use the count from the JSTL forEach loop, but my code doesnt seem to work.
我想使用 JSTL forEach 循环中的计数，但我的代码似乎不起作用。
<c:forEach items="${loopableObject}" var="theObject" varStatus="theCount">
<div id="divIDNo${theCount}">
</div>
</c:forEach>
produces
产生
<div id="divIDNojavax.servlet.jsp.jstl.core.LoopTagSupportStatus@5570e2" >
采纳答案by highlycaffeinated
The variable set by varStatusis a LoopTagStatusobject, not an int. Use:
变量 set byvarStatus是一个LoopTagStatus对象，而不是一个 int。用：
<div id="divIDNo${theCount.index}">
To clarify:
澄清：
${theCount.index}starts counting at0unless you've set thebeginattribute${theCount.count}starts counting at1
${theCount.index}0除非您设置了begin属性，否则开始计数${theCount.count}开始计数1
回答by Nathanphan
You can try this. similar result
你可以试试这个。类似的结果
<c:forEach items="${loopableObject}" var="theObject" varStatus="theCount">
<div id="divIDNo${theCount.count}"></div>
</c:forEach>
回答by jyoti pani
Its really helped me to dynamically generate ids of showDetailItemfor the below code.
它确实帮助我showDetailItem为以下代码动态生成 id 。
<af:forEach id="fe1" items="#{viewScope.bean.tranTypeList}" var="ttf" varStatus="ttfVs" >
<af:showDetailItem id ="divIDNo${ttfVs.count}" text="#{ttf.trandef}"......>
if you execute this line <af:outputText value="#{ttfVs}"/>prints the below:
如果您执行此行，则会<af:outputText value="#{ttfVs}"/>打印以下内容：
{index=3, count=4, last=false, first=false, end=8, step=1, begin=0}
{index=3, count=4, last=false, first=false, end=8, step=1, begin=0}
回答by diego matos - keke
you'd use any of these:
你会使用以下任何一种：
JSTL c:forEach varStatus properties
JSTL c:forEach varStatus 属性
Property Getter Description
属性获取器描述
current getCurrent() The item (from the collection) for the current round of iteration.
index getIndex() The zero-based index for the current round of iteration.
count getCount() The one-based count for the current round of iteration
- first isFirst() Flag indicating whether the current round is the first pass through the iteration
last isLast() Flag indicating whether the current round is the last pass through the iteration
begin getBegin() The value of the begin attribute
end getEnd() The value of the end attribute
step getStep() The value of the step attribute
current getCurrent() 当前轮次迭代的项目（来自集合）。
index getIndex() 当前轮次迭代的从零开始的索引。
count getCount() 当前一轮迭代的从一开始的计数
- first isFirst() 指示当前轮次是否为第一遍迭代的标志
last isLast() 指示当前轮次是否为最后一次迭代的标志
begin getBegin() begin 属性的值
end getEnd() 结束属性的值
step getStep() step属性的值
