Render a Map of lists as a table in grails - grails

Question

I have a controller which is passing on a hashmap to a view. The map has 3 elements, one of which is as below:
-- A list of lists (A) in which list3 is a list of lists
Now I want to display them on the gsp as follows:
-----------------------------------------------------------------------------
A.list1 | A.list2 | A.list3[0] | A.list4 |
| | A.list3[1] | |
| | A.list3[2] | |
----------------------------------------------------------------------------
I have very little knowledge about generating views and I need nothing more than the tabular format here. Nothing more fancy. I just want the table because the data makes sense only in that format. Thank you.

Answer 1

welcome to the Grails world. Hope you have an awesome experience. Unsure if you are aware but by generating a view i.e. the default scaffolding CRUD elements auto generated and most specifically the list.gsp has most of that logic in place. None the less I reviewed your question over again and can see your stuck on map that has a list which is really simply stuff. So here goes.:
<g:each in="${A}" var="myMap">
<tr>
<td>${myMap.list1}</td>
<td>${myMap.list2}</td>
<td>
<g:each in="${myMap.list3}" status="i" var="myList3">
${myList3} <!-- this should be what you want I have added below -->
<!-- ${myList3?.name} --> <!-- explained further below -->
<!-- ${i} : ${myList3} --> <!--where i is this is the iterator -->
</g:each>
</td>
<td>${myMap.list4}</td>
</tr>
</g:each>
I put in comments myList3?.name simply because if the list is actually a binding of domain objects then you could display the element from the domainclass that is that being returned.
so:
class Country {
String name
static hasMany=[cities:Cities]
}
Class Cities {
String name
static belongsTo=[Country:country]
}
Then if A was ${country} and list3 was cities then .name would actually show the cities.name which is the binded value...
In other examples of raw maps that are not domainClass binded being returned to a gsp you could use the key value definition to parse:
raw map being passed to gsp
private Map menuMap = ['index':'Socket method', 'ajaxpoll':'Ajax poll',
'socketremote':'RemoteForm Websocket', 'scsocket':'NEW: Websocket Client/Server']
navbar gsp
<g:each in="${menuMap }" var="cmenu">
<li <g:if test="${actionName == cmenu.key}">class="active"</g:if>>
<g:link action="${cmenu.key}">
${cmenu.value}
</g:link>
</li>
</g:each>