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CHAPTER 7 ENCOUNTERING THE MONSTERS IN THE CAVE
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Grouping is where SharePoint stops playing fair and commits a grave sin, leading to all those who complain about SharePoint creating horrible HTML being right. You see, when you start working with grouping, SharePoint assumes that you are presenting your view in an HTML table. In fact, it forcibly adds table code to your already existing view. If you do not use a table to render your view, you get plenty of errors and the nearly impossible task of creating something resembling reasonable code. Let me show you what I mean with an example. Let s start by continuing our existing table-based layout, so add the following code to your view: <Query> <GroupBy> <FieldRef Name="Title"/> </GroupBy> </Query> <GroupByHeader> <HTML><![CDATA[<tr><td colspan="3">]]></HTML> <GetVar Name="GroupByValue"/> <HTML><![CDATA[</td></tr>]]></HTML> </GroupByHeader> <GroupByFooter> <HTML><![CDATA[<tr><td colspan="3"> Grouped by ]]></HTML> <GetVar Name="GroupByField" HTMLEncode="TRUE"/> <HTML><![CDATA[</td></tr>]]></HTML> </GroupByFooter> Yeah, I know, grouping by title doesn t make much sense, but hear me out. When we add this code to our list template and deploy, our view looks like Figure 7-10. That s right when you add grouping, SharePoint will add an extra TD element for each of the rows of our view, even if we do not have a table-based layout at all. The result if we are not using a table for our layout is nothing less than a disaster. My advice Stick to tables for view layouts, or avoid using grouping at all.
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Figure 7-10. An extra TD element When you add grouping to your view, SharePoint handles most of the magic required to group your items together. This magic includes the grouping and intragroup sorting as well as counting and other necessary functions. All we need to do is add descriptive headers and footers to our respective GroupXXX elements. Try adding this to your view, after adding the GroupBy element to your Query element: <Query> <GroupBy> <FieldRef Name="Title"/> </GroupBy> </Query> <GroupByHeader> <HTML><![CDATA[<tr><td colspan="3">]]></HTML> <GetVar Name="GroupByValue" /> <HTML><![CDATA[</td></tr>]]></HTML> </GroupByHeader> <GroupByFooter> <HTML><![CDATA[<tr><td colspan="3"><hr>]]></HTML> <HTML><![CDATA[</td></tr>]]></HTML> </GroupByFooter> Your resulting view should resemble Figure 7-11.
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Figure 7-11. Grouping added to a view
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Note I ve removed border="1" from the table in Figure 7-11. I just get so sad when I am constantly
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reminded of the way GroupHeader and GroupFooter are implemented.
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The GroupHeader and GroupFooter elements have a few noteworthy variables we can get by using the GetVar element. The GroupByValue that we used in the previous example returns the group value and the number of items within the group. The GroupByField returns the name of the field used for grouping. Again, finding all the different GetVar variables is a bit of a challenge, and in this case the out-of-the-box SharePoint views are your best bet.
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Permissions and Security Trimming
SharePoint 3 is great for security trimming information and links. Compared to previous versions, you no longer see links to items or functions that you cannot access. The truth, however, is that in many cases you, as a developer, need to implement that security trimming yourself. Let s say we wanted to add a link to edit an item in our view. You might go ahead and add something like this to your ViewBody: <HTML><![CDATA[<a href="]]></HTML> <URL Cmd="Edit"/> <HTML><![CDATA["> (Edit item)</a>]]></HTML> This would render a link to editing the item, but that link would be present for everyone, regardless of their permissions. Take a look at Figure 7-12 for how this might appear.
CHAPTER 7 ENCOUNTERING THE MONSTERS IN THE CAVE
Figure 7-12. Added link to edit item If a user does not have permissions, however, the user will get the famous Error: Access is denied message when they click the link. Although secure enough, this is hardly a great user experience. To improve this, we can edit the view CAML and use an element called IfHasRights that allows us to show information only if a user has certain permissions. The IfHasRights has two child elements, the RightsChoices and a Then, with the RightsChoices element having additional child elements called RightsGroup. I think this will be easier to understand if we look at an example: <IfHasRights> <RightsChoices> <RightsGroup PermEditListItems="required" /> </RightsChoices> <Then> <!-- Your view code here --> </Then> </IfHasRights> You can have multiple RightsGroup elements, and you can specify multiple permissions in a single RightsGroup. There is a difference; you would use one or the other depending on whether the user must have all or any of the permissions you demand. If you specify multiple permissions inside a single RightsGroup, then the user must have all of the rights listed in the RightsGroup element: <RightsChoices> <RightsGroup PermOpenItems="required" PermViewListItems="required"/> </RightsChoices>
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