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Today I added a feature in my shopping cart JSP page but nothing was showing up.  This was because the output of ATG ForEach droplet was blanks.

To debug this I did the following steps.

1. I added an empty oparam to see if the ForEach droplet thought the collection was empty.

   <dsp:oparam="empty">Empty?</dsp:oparam>

   It did not.

2. I outputted the count in the output oparam to see if it was looping through the collection.

   <dsp:oparam="output"><dsp:valueof param="count"/> <dsp:valueof param="element"/></dsp:oparam>

   It was looping through the collection.

3. Finally I debugged using Eclipse the ForEach code.  The ForEach code can be found in <ATG>/DAS/src/Java/atg/droplet/ForEach.java. 

   Using the debugger I realized that the element name of the loop was being set to something else which is why <dsp:valueof param=”element”/> was blank.

It turned out that the ForEach droplet was inside another ForEach droplet and in that droplet they set the element name like this.

<dsp:param name="elementName" value="CommerceItem" />

By setting the elementName parameter to something else in my ForEach droplet and then referencing it properly I was finally able to get the expected output.

<dsp:droplet name="/atg/dynamo/droplet/ForEach">
 <dsp:param name="array" param="CommerceItem.auxiliaryData.productRef.dvds"/>
 <dsp:param name="elementName" value="dvd" />
 <dsp:oparam name="output">
  <dsp:valueof param="dvd.name" />
 </dsp:oparam>
</dsp:droplet>

By the way ATG documentation suggests not using elementName.

elementName and indexName allow you to provide a parameter name other than element and index, respectively. A better way to provide a different parameter name is to use the dsp:setvalue tag.

In our example we would do this instead of setting the elementName param.

 <dsp:setvalue param="dvd" paramvalue="element" />

Related posts:

1. ATG ForEach Output with Separators Between Items
2. Comparison of DSP and DSPEL
3. How to Set an Array Property in an ATG Form
4. How to Debug an InvalidVersionException from Updating an ATG Order
5. Jumping to different parts of a page using a dropdown