c# create 2d barcode ENCOUNTERING THE MONSTERS IN THE CAVE in Font

Creation DataMatrix in Font ENCOUNTERING THE MONSTERS IN THE CAVE

CHAPTER 7 ENCOUNTERING THE MONSTERS IN THE CAVE
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This piece of view schema CAML will render HTML like the following: This page displays items from 1 to 2. To get to the next page, <a href=" Paged=TRUE&p_ID=2&View=[GUID OF YOUR VIEW]&PageFirstRow=3">click here</a>
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GET WHAT VAR
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When I just said the available variables depend on the context, you might have been a bit curious as to exactly what I meant. What context offers what variables Sadly, there is no simple answer to this. First, let s all join together for the chorus: The documentation doesn t say.... Second, much of the code used to render views as HTML has been obfuscated and is thus not open for inspection. Third, well, many of the usages in the schema.xml files that ship with SharePoint are either plain wrong, do not work, or do not seem to have any effect. So, where does that leave us Stranded, I m afraid, which is why the best option is to bring out some suntan lotion, spread out a towel, and fire up some Beach Boys classics. If that does not solve your curiosity, here are a few tips that might help: Some documentation exists, so your first order of business would be to check the documentation. Good luck with that. Your second chance would be to look at existing out-of-the-box views to see which GetVar variables are used by Microsoft. GetVar variables are scoped, meaning that they might work for one part of a view but not in other parts. Query string parameters are available as GetVar values. If you add MyVar=MyValue to the query string of the view page, you can access MyValue using <GetVar Name="MyVar" />. Now, you may be tempted to add a link to the previous page to this code. For example: <HTML><![CDATA[<br/><a href=" ]]></HTML> <GetVar Name="PrevPageData" /> <HTML><![CDATA[">Previous page</a>]]></HTML> However, before you do that, consider what happens on the first page; you would have a link to the previous page that would link to only , since there is no previous page at all. The PrevPageData would be empty. So, in order to detect whether we should link to the previous page, it makes sense to check whether the PrevPageData contains anything. To do such checks or any check in view CAML, we can use one of several conditional elements. Let s take a look at how conditional elements work.
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Conditional Elements
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To render part of the view, such as the link to the previous page of a paged view, only if a specific condition exists, the view schema gives you several options. Table 7-2 lists the conditional elements.
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CHAPTER 7 ENCOUNTERING THE MONSTERS IN THE CAVE
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Table 7-2. Conditional Elements in View Schema
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Element
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Child Elements
Expr1, Expr2, Then, Else
Description
Compares Expr1 and Expr2 and performs Then if the values are equal. Otherwise, performs Else. Checks to see whether Expr1 is contained in Expr2 and, if so, performs Then. Otherwise, performs Else. If Expr1 is a negative value, then Expr1 is displayed. Otherwise, Expr2 is displayed. If item is created today, displays view schema contents. Checks to see whether the current user has certain permissions and, if so, performs Then. Works like a normal Switch/Case. Checks the Expr value against all Case values and performs the Case where the Expr matches. If no Case matches, performs Default. Same as Switch but Expr is evaluated only once per view display. This is useful if you want to do Switch on a value that does not change during the rendering of the view, such as a column.
IfSubString
Expr1, Expr2, Then, Else
IfNeg IfNew IfHasRights
Expr1, Expr2 None RightsChoices/RightsGroup, Then
Switch
Expr, Case, Default
FieldSwitch
Expr, Case, Default
These conditional elements all have their uses, and we will see more examples of how these are used during the course of this chapter. For now, let s make some code to display only the Previous page link if the PrevPageData is empty. I will use a Switch element for this, but you might as well use IfEqual. Add the following to your PagedRowset element: <Switch> <Expr> <GetVar Name="PrevPageData" /> </Expr> <Case Value=""></Case> <Default> <HTML><![CDATA[<br/><a href=" ]]></HTML> <GetVar Name="PrevPageData" /> <HTML><![CDATA[">Previous page</a>]]></HTML> </Default> </Switch> In the previous code, we check the value of the PrevPageData variable. If that value is empty (in other words, if Value is ""), we do nothing. Otherwise (if the PrePageData does contain something), we display the CAML that is inside the Default element (see Figure 7-8).
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