To access the index value of struts iterator in scriptlet array index

问题

I am a newbie in web development. Using Struts2, I have a comma separated String of my images captions. While iterating the images to render on JSP I need to display caption along with specific images and could not get any specific tag to split caption String over delimiter and to access specific caption. I am trying the below code and don't know what to use in place of something to get the current iteration index in iterator.

<s:iterator value="images" status="incr">  
  <%= ((String)request.getAttribute("imageCaptionsString")).split(",")[something]%>
</s:iterator>

I know that using scriptlets and expression tags in JSP are not recommended, but I don't have any idea how to avoid it.

Any help will be appreciated.

回答1:

The current iteration index is available via the status attribute of the s:iterator tag. In your case is #incr.index. If you want to display that index

<s:iterator value="images" status="incr"> 
  <s:property value="%{#incr.index}"/>

then scriplet could be changed to OGNL expression

<s:property value='#attr.imageCaptionsString.split(",")[%{#incr.index}]'/>

回答2:

After struggling a lot and with the help of answer suggested by Mr. Roman C, I got the solution and keeping here for sake of any future needy user.

<s:iterator value="images" status="incrementer">
  <s:set var="cnt" value="%{#incrementer.index}" />
  <s:property value="#attr.imgCaptions.get(#cnt)"/>
</s:iterator>

This way I got the captions. Thanks to Mr. Roman C.

回答3:

This should do

<s:iterator value="imageCaptionsString.split(",")">  
    <s:property/>
</s:iterator>

If that doesn't work, then might be because it's a request attribute & hence, not available directly on valueStack, in which case you can use #attr.imageCaptionsString instead of plain imageCaptionsString in the iterator.

来源：https://stackoverflow.com/questions/19856296/to-access-the-index-value-of-struts-iterator-in-scriptlet-array-index

标签

java

jsp

struts2

ognl