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CHAPTER 9 STROLLING THROUGH FIELDS OF GOLD
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Figure 9-3. Effect of FromBaseType Finally, notice the reference to the Title site column in the Item content type. This reference includes ShowInNewForm="TRUE" and ShowInEditForm="TRUE". We touched briefly on this in 8 when you learned how the Document content type modified the behavior of the Title column in list forms. The ShowInXXXX attributes control when a column is displayed in various list form pages. The sister attributes are ShowInDisplayForm, ShowInEditForm, ShowInListSettings, ShowInNewForm, ShowInVersionHistory, and ShowInViewForms. Note that the attributes are relevant only when you use the default methods of creating list forms. If you create your own custom list forms or you use other data input, edit, or display methods such as a Windows application or a custom RSS feed, you must make sure you honor or disregard these settings yourself.
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Picking Up the Pace
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So far, we have seen simple examples of how columns are defined using a feature. None of these examples should pose much of a challenge, except perhaps by the amount of possible attributes to the Field element. Now it is time to pick up the pace, because we have only scratched the surface of what fields can do. Remember that cave of monsters called views Well, we are going back, at least to some extent, to the view schema that we explored in views. This time, we should be much more prepared for what lies ahead.
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CHAPTER 9 STROLLING THROUGH FIELDS OF GOLD
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LinkTitle
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The next column I want to show you is a much more complex example a computed column named LinkTitle. This column is responsible for creating the contents of the EditControlBlock drop-down menu when you hover over the title of an item.
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Note That s actually only part of the truth, because the functionality and at least some of the content in
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the ECB is created using JavaScript. But that s another show .
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In my fieldswss.xml file, it is located at line 535. Search the file for Name="LinkTitle", and you should find it. Figure 9-4 shows the field CAML code.
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Figure 9-4. LinkTitle field The first thing you should notice is that there are two child elements to the Field element, FieldRefs (lines 546 551) and DisplayPattern (lines 552 562). FieldRefs references other columns, including the Title column that we explored earlier. These referenced columns are used when rendering the LinkTitle column. The rendering is done in the DisplayPattern element. You may recognize the look and feel of the code here; it is the same schema as we used in views. Thus, we should have the proper weapons to understand what s happening. Let s take a look. The DisplayPattern element contains a FieldSwitch (553), which you may remember is the same thing as a Switch, except it is evaluated only once per view. The column here checks whether we are in FreeForm mode (554), meaning we are not in a list view, and if we are, it
CHAPTER 9 STROLLING THROUGH FIELDS OF GOLD
renders the output of one of the referenced columns, called LinkTitleNoMenu (555). If we are not in FreeForm mode, we should also render two more columns, _EditMenuTableStart and _EditMenuTableEnd, in addition to the LinkTitleNoMenu (lines 556 560). So, where are these three columns defined A quick search in fieldswss.xml for Name="_EditMenuTableStart" reveals the answer; they re around line 1001, in the form of a massively complex Field element. It has no less than 16 references to other columns and a DisplayPattern that would scare even the bravest of developers. Don t let the complexity overwhelm you. On closer inspection, you will find that most of the FieldRef references are just references to simple elements, and the display pattern is just used to output some extraordinarily ugly HTML in a fairly simple HTML table: <table height="100%" cellspacing=0 class="ms-unselectedtitle" onmouseover="OnItem(this)" CTXName="ctx1" Id="1" Url="/Shared%20Documents/MyDocument.docx" DRef="Shared Documents" Perm="0x7fffffffffffffff" Type="" Ext="docx" Icon="icdocx.gif|Microsoft Office Word|SharePoint.OpenDocuments" OType="0" COUId="" SRed="" COut="0" HCD="" CSrc="" MS="0" CType="Document" CId="0x0101008AD77C1A367C63479F46C59787295E88" UIS="512" SUrl=""> Now you know where those people who say SharePoint renders noncompliant HTML get their arguments. Most of the attributes here have nothing to do with HTML and will likely make any HTML validator explode. Twice. Still, there s no need to worry, because we can change this if we like, but for now we should move on. If we continue to look at the LinkTitleNoMenu column referenced in our original LinkTitle column, starting at around line 502 in my file, we find a much more agreeable sight: two referenced columns and a rather understandable DisplayPattern. Here s the whole DisplayPattern. Note that I have removed some comments for formatting purposes. <DisplayPattern> <IfEqual> <Expr1><LookupColumn Name="FSObjType"/></Expr1> <Expr2>1</Expr2> <Then><Field Name="LinkFilenameNoMenu"/></Then> <Else> <HTML><![CDATA[<a onfocus="OnLink(this)" href="]]></HTML><URL/> <HTML><![CDATA[" ONCLICK="GoToLink(this);return false;" target="_self">]]> </HTML> <Column HTMLEncode='TRUE' Name="Title" Default='$Resources:core,NoTitle;'> </Column> <HTML><![CDATA[</a>]]></HTML> <IfNew> <HTML><![CDATA[<IMG
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