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Adding a Choice Field
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Adding a Choice type field is a little different since it requires additional information regarding the possible choices You can store the choices in an instance of the System CollectionsSpecializedStringCollection class, as shown in this example:
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PS PS PS PS > > > > $choices = New-Object SystemCollectionsSpecializedStringCollection $choicesAdd("First Choice") $choicesAdd("Second Choice") $choicesAdd("Third Choice")
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Now that we have our choices stored in a variable, we can use the variable when creating a Choice type field
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PS > $spFieldType = [MicrosoftSharePointSPFieldType]::Choice PS > $spListFieldsAdd("ChoiceField",$spFieldType,$false,$false,$choices)
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We use the choices variable to associate a list of options with the field
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The following demonstrates how to wrap this code in a function
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function New-SPChoiceField( [string]$url, [string]$field, [array]$choices, [switch]$required ) { # Use the Get-SPList function to retrieve a list $spList = Get-SPList -url $url if($spList) { $spFieldType = [MicrosoftSharePointSPFieldType]::Choice $colChoices = New-Object SystemCollectionsSpecializedStringCollection foreach ($choice in $choices) { $colChoicesAdd($choice) | Out-Null } $spListFieldsAdd($field,$spFieldType,$required,$false,$colChoices) } }
Run the function by typing the following:
PS > New-SPChoiceField -url "http://nimaintranet/site/Lists/My Custom List" ` >> -field Pick One -choices @(1,2,3)
In this example, we use the function New-SPChoiceField to add the field Pick One to the My Custom List list We also add the options 1, 2, and 3 using the -choices parameter The -choices parameter accepts an array as input A simple way to create an array is by placing a comma-separated list of values within the @() subexpression, as shown in the previous example When creating a Choice type field using Windows PowerShell, the display format is set to a drop-down list by default We can change this to radio buttons, as shown here:
PS > $spField = $spListFieldsGetField("ChoiceField") PS > $spFieldEditFormat = "RadioButtons" PS > $spFieldUpdate()
In this example, we retrieve the ChoiceField field by using the GetField method provided by the SPFieldCollection class We then change the EditFormat property to RadioButtons and call the Update method to commit the changes to the content database We can also set a default choice using the DefaultValue property
PS > $spField = $spListFieldsGetField("ChoiceField") PS > $spFieldDefaultValue = "Second Choice" PS > $spFieldUpdate()
PowerShell for Microsoft SharePoint 2010 Administrators
Adding a Lookup Field
To add a lookup field to a SharePoint list, use the AddLookup method of the SPFieldCollection class You need to provide the method with the field s display name and the ID of the list that the lookup field should point to In the next example, we get the ID of an existing list named Tasks, store the ID of the list in a variable, and use the variable to create a lookup field
PS > $lookupListId = >> (Get-SPList -url "http://nimaintranet/site/Lists/Tasks")Id PS > $spListFieldsAddLookup("LookupField",$lookupListId,$false)
The following is the same code wrapped in a function
function New-SPLookupField ( [string]$url, [string]$lookupListURL, [string]$field, [switch]$required ) { # Use the Get-SPList function to retrieve a list $spList = Get-SPList -url $url $lookupListId = (Get-SPList -url $lookupListURL)Id if($spList -and $lookupListId) { $spListFieldsAddLookup($field, $lookupListId, $required); } }
Run the function by typing the following:
PS > New-SPLookupField -url "http://nimaintranet/site/Lists/My Custom List" ` >> -lookupListURL "http://nimaintranet/site/Lists/Tasks" ` >> -field My Lookup
In this example, we create a lookup field named My Lookup The lookup field points to the Tasks list Creating a lookup field that points to a list in a different site requires the list ID and the site ID In the following example, we retrieve the list ID and the site ID using the Get-SPWeb cmdlet, and then use the values with the AddLookup method
PS >> PS PS > $lookupListId = (Get-SPList -url "http://nimaintranet/finance/Lists/Tasks")Id > $lookupWebId = (Get-SPWeb -Identity http://nimaintranet/finance)Id > $spListFieldsAddLookup("SubsiteLookup",$lookupListId,$lookupWebId,$false)
SharePoint 2010 also supports a dependent lookup field type, which depends on a primary lookup field for its relationship to the list from which it gets its values In the
14:
Working with SharePoint Lists
following example, we store the primary lookup field s ID in a variable and use the variable as input to the AddDependentLookup method of the SPFieldCollection to create a dependent lookup field
PS > $spList = Get-SPList -url "http://nimaintranet/site/Lists/My Custom List" PS > $primaryFieldId = $spListFields["LookupField"]Id PS > $spListFieldsAddDependentLookup("Dependent lookup",$primaryFieldId)
A dependent lookup field added using Windows PowerShell points to the Title field by default We can change this by editing the field s LookupField property, as shown here:
PS PS PS >> PS > $sourceList = Get-SPList -url "http://nimaintranet/site/Lists/Tasks" > $spList = Get-SPList -url "http://nimaintranet/site/Lists/My Custom List" > $spListFields["Dependent lookup"]LookupField = $sourceListFields["Start Date"]InternalName > $spListFields["Dependent lookup"]Update()
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