One  of the most common things I do during taking interviews is to give real  life scenarios and assess the person on how he tackles the situation.  Most of the times, what I really look for is how he goes forward in  solving the problem – the approach and the way of thinking rather than  the answer itself. Another thing that I look for is whether he tries to  put some extra effort to implement the solution (especially the  reporting part) in an aesthetic and user-friendly way. Most of the  candidates would know the answer to some simple question like how to add  data labels to their charts but they stutter when I ask what are smart  labels or how can we prevent the cluttering of data labels. I would  easily give brownie points to someone who details his solution with some  extra attention to details. It must be my frequent rendezvous with  creating big reports that make me extra fond of document maps in SSRS  and an essential part of my SSRS interview questions.
It  is hard to imagine going through a big book that has no table of  contents. But many users and developers have no problem at all in  designing big reports without any navigational aid (although at some  point of their wretched life, the users are going to curse the person  who developed those reports), even though Microsoft has provided this  feature. Document Map is a navigational feature in SSRS that, when  implemented, allows the user to navigate through the document and its  hierarchies. With this feature, you can add a panel to the left of the  reports where you can have the list of “contents” of the report. What  makes it more special is that on clicking the “content” in the list, you  will be directly taken to the page where the content is present. Cool  feature, huh?
Requirement
Suppose you already have a matrix or a table with some groupings as shown below
Suppose  the number of subcategories are very large and spans into multiple  pages and the requirement is such that each user has to specifically  search for a set of subcategories at a particular time of the day. It  would make his life a lot easier if there was a document map listing the  subcategories on clicking which he would be directly taken to the  clicked subcategory
Solution
1) Go to the design mode of the report and click on the group properties of subcategory.
2)  Go to the advanced tab of the properties and set the Document map as  the field Subcategory (you can select the appropriate field name from  the drop-down).
3) Save the report, deploy it and then preview it .
Already  you can see the panel at the left hand side which contains the list of  subcategories. To hide/unhide this panel, you can click on the icon that  has been highlighted in red in the above image. Notice that the  “Document Map” text highlighted in blue is the report name.
4)  Now you can click on any of the subcategories, say Handlebars and you  would be taken to the page where the clicked subcategory is.
5)  (a) You can also make document map labels for each of your report item.  For eg, if you have 2 tables, you can click on the table and press F4  to see the properties. 
5)  (b) You can give the required name in the DocumentMapLabel property as  shown above and then see the required result when you preview the  report.
6)  Now that you have seen the toggle symbol, you would have already  guessed that it is possible to create hierarchies also in the document  map label, for e.g., Subcategory—>Product. For that, all you need to  do is to enable Document Map property for the Product group also.
Note
      “ Document Map is mostly for 
HTML rendering. Other renderers render differently.o PDF: Uses Bookmarks.
o Excel: Uses named worksheet with hierarchical links. Report sections appear in other sheets.
o Word document also has a document map like the table of contents.
o Tiff, CSV, and XML ignore this setting.
o Recursive data is related to the idea of self joins where the relationship between parent and child is represented by fields in the dataset. “
So  there ends the part 3 of my interview series. In my next blog, I would  be taking a momentary break from my interview question series and  presenting a very interesting application of Document Maps, wait for it  :)
