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CHAPTER 6 WHAT LURKS IN THE FOREST OF LISTS
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Figure 6-9. List instance TemplateType and list template Type attribute Microsoft recommends using integers greater than 10,000 for Type to avoid possible conflicts with future list templates from Microsoft. Although there is no technical reason why this should be the case, it doesn t hurt to follow this advice, so keep your Type integers greater than 10,000. If you have worked extensively with SharePoint lists before, you may know that there are a ton of templates that ship with Microsoft that have Type numbers from 100 to around 300 in addition to a few more. If Unique is set to True, a list based on this template can be created only once for each site. For example, the User Information list or most of the built-in galleries have this attribute set to True. There is a quirk here, though. If Unique is set, the list template will not appear on the Create page, regardless of whether an instance of the list exists. I believe Microsoft s motivation is that this attribute should be set only for lists created during site provisioning, and thus, there will not be a need to actually let the user manually create the list. I think that is sad. I mean, this could have been a great feature. Consider having your users be able to create a list, but only once. This would have been an excellent option for creating a sitewide template library or a common images library or a range of other such lists or libraries. You can still actually create a list, even through the web interface, but you need to give the users a direct link to the New.aspx page with the FeatureId and ListTemplate parameters set manually. Naturally, you can have only one list instance at a time if the Unique attribute is set to True.
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CHAPTER 6 WHAT LURKS IN THE FOREST OF LISTS
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UseRootFolderForNavigation is also a curious little animal that hops around in the forest without anyone even knowing it is there. When I first read the documentation, it took me several hours to find out how to use the attribute. The simple idea is that you can use a custom welcome page for a list rather than the default view of all the items in the list. I think this is a marvelous idea; rather than having that dreadful list, you can have a starting page with perhaps some detailed instructions, an introduction to a library, a better interface to library navigation such as an Explorer-style tree view, or even a more intuitive preview using Ajax or Silverlight. Now that s a user experience enhancement if I ever saw one. Sadly, at the time, there were only about five hits on Google for the attribute, and the documentation is at best confusing. I will skip the long story of how I found out (you can read it in my blog at http://www.understandingsharepoint.com/url/10006 if you are really interested), and I will just explain how it works. You might actually already have seen this in action. The wiki library uses this feature to display a specific wiki page rather than a list of pages when you enter the library. Basically what you need to do, besides setting this attribute to True, is to set the WelcomePage property of the root folder of the list. The above explanation is not very enlightening unless you have done this before. First, take a look at Figure 6-10. I have opened the root folder of a wiki site in SharePoint Manager 2007. Feel free to follow along if you like.
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Figure 6-10. WelcomePage property set on wiki site
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CHAPTER 6 WHAT LURKS IN THE FOREST OF LISTS
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If you look at Figure 6-10, you will notice that there is a RootFolder located at the root of the site. This folder is the virtual place where files such as default.aspx are stored. There will also be a folder, Lists, that contains subfolders for all the lists of your site, as well as the root Folder objects for all your libraries. Each of these folders is represented in the object model by an SPFolder object. SPFolder objects are useful for several reasons. As mentioned earlier, SPLists do not have any property bag, so if you want to store custom information about a list, you are out of luck at least until you remember that there is an SPFolder object for each SPList, meaning you can store the properties in the SPFolder instead. To use the UseRootFolderForNavigation attribute, however, we will use the WelcomePage property of the list s SPFolder to store the URL to a page that will serve as the front page of our list. The easy choice to set the WelcomePage property is to just use a tool like SharePoint Manager to set the property. However, that is not very scalable and certainly not deployable. Sadly, there is no CAML way to store SPFolder properties. This means that in order to set the property, we need to use code. For instance, you can use a FeatureActivated event handler to set the property. OK, that just about completes the ListTemplate attributes. Here is what I would call a good news/bad news situation. The good news is that there is little more you should know about the ListTemplate element. There are no subelements, and the attributes that we have not covered here are either very easy to understand or very unimportant to understand, at least from a user experience point of view. The bad news is that there is one more thing you must learn in order to create a list template, and that is schema.xml. You may have wondered how the attributes of a list template would be enough to create a list, and the answer is that the ListTemplate element is only one part of the solution.
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