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Figure 7-5. Yup, those are toolbars. The nature of the freeform toolbar is that you can do mostly whatever you want. And, to be able to do whatever you want, you need a massive amount of options, which is exactly what freeform toolbars give you. To start, let s add a link to the site settings for a list. Figure 7-6 shows what our end result should be.
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Figure 7-6. Our sample freeform toolbar To accomplish this rather simple task, we need to get into what is called the view schema. The view schema is the part of CAML that handles views, including giving us the tools we need to customize our freeform toolbar. We will explore the view schema plenty more later in this chapter, but this little bit of code will get our feet wet.
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Replace your <Toolbar Type="Standard"/> with the following code: <Toolbar Type="FreeForm"> <HTML><![CDATA[<A HREF="]]></HTML> <HttpVDir/> <HTML><![CDATA[/_layouts/ListEdit.aspx List=]]></HTML> <List/> <HTML><![CDATA[">List settings for ]]></HTML> <ListProperty Select="Title"/> <HTML><![CDATA[</a>]]></HTML> </Toolbar> The HTML element tags are used to output plain HTML. Since XML cannot contain HTML, we need to wrap our HTML code in a CDATA child element. The HttpVDir element outputs the path to the root of our current site. In my case, that would be http://lab-s02:10000/ for the root Team Site lab.
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Note The HttpVDir documentation includes two attributes that are not present in the schema, meaning
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you will not get IntelliSense. These attributes, URLEncode and URLEncodeAsURL, will encode the output to a URL-safe string. If you add these attributes, Visual Studio will complain that the attributes are not defined, but you can safely ignore this warning because the attributes do work. Refer to the documentation for more details on these attributes.
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The List element outputs the GUID of the current list, in other words, the list to which the view is bound. The ListProperty outputs various properties of the list. It is used here to output the title of our list. Together these elements output a string resembling a link to the URL for the list settings: <A HREF="http://lab-s02:10000/_layouts/ListEdit.aspx List= {0AD6263B-6616-4BEA-850B-F30E18C8E97A}">List settings for Testlist</a> As mentioned, we will get much more experience with the view schema during the course of this chapter. For now just replace your new toolbar with the original standard toolbar: <Toolbar Type="Standard"/>
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OK, that was a bit worse. That last monster proved that there really is a reason to be attentive in this place. If this was a preview of what is to come, then fighting the dragon at the end may be too hard.
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Asking the Right Questions
Before we actually get to fill our new view with wonderful content, we need to know what that content should be. For this we need to look to another schema, the query schema. You may already be familiar with the query schema if you have worked with extracting list items using the object model. The SPList.GetItems accepts an SPQuery object, which in turn has a Query property. That Query property is a string formatted according to the query schema. A query schema string resembles SQL in structure and functionality and is used to filter, order, and group items. All filtering is done in the Where child element inside the Query element. A simple filtering query schema string might look like this: <Where> <Eq> <FieldRef Name='Title'/> <Value Type='Text'>My title</Value> </Eq> </Where> This query string would show items where the Title equals My title. You might remember this sample from 2. To use the query schema in our view, we would add a valid query string to the Query element of our view. For example: <View BaseViewID="2" DefaultView="TRUE" DisplayName="Custom View" Type="HTML" SetupPath="pages\viewpage.aspx" WebPartZoneID="Main" Url="CustomView.aspx" > <Query> <Where> <Eq> <FieldRef Name='Title'/> <Value Type='Text'>My title</Value> </Eq> </Where> </Query> </View> The query string can be much more complex than this. First, we have many more filtering methods. Table 7-1 shows the different comparison operators we can use to filter the items that should appear in our view.
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