DDL List Screenlet for iOS

Requirements

Compatibility

  • iOS 9 and above

Xamarin Requirements

  • Visual Studio 7.2
  • Mono .NET framework 5.4.1.6

Features

The DDL List Screenlet enables the following features:

  • Shows a scrollable collection of DDL records.
  • Implements fluent pagination with configurable page size.
  • Allows filtering of records by creator.
  • Supports i18n in record values.

JSON Services Used

Screenlets in Liferay Screens call JSON web services in the portal. This Screenlet calls the following services and methods.

ServiceMethodNotes
ScreensddlrecordService (Screens compatibility plugin)getDdlRecordsWith ddlRecordSetId, or ddlRecordSetId and userId
ScreensddlrecordService (Screens compatibility plugin)getDdlRecordsCount

Module

  • DDL

Themes

  • The Default Theme uses a standard UITableView to show the scrollable list. Other Themes may use a different component, such as UICollectionView or others, to show the items.

The DDL List Screenlet using the Default (default) Theme.

Portal Configuration

Dynamic Data Lists (DDL) and Data Types should be configured in the portal. For more details, please refer to the Liferay User Guide sections Defining Data Types and Creating Data Lists.

Offline

This Screenlet supports offline mode so it can function without a network connection. For more information on how offline mode works, see the tutorial on its architecture. Here are the offline mode policies that you can use with this Screenlet:

PolicyWhat happensWhen to use
remote-onlyThe Screenlet loads the list from the portal. If a connection issue occurs, the Screenlet uses the delegate to notify the developer about the error. If the Screenlet successfully loads the list, it stores the data in the local cache for later use.Use this policy when you always need to show updated data, and show nothing when there’s no connection.
cache-onlyThe Screenlet loads the list from the local cache. If the list isn’t there, the Screenlet uses the delegate to notify the developer about the error.Use this policy when you always need to show local data, without retrieving remote information under any circumstance.
remote-firstThe Screenlet loads the list from the portal. If this succeeds, the Screenlet shows the list to the user and stores it in the local cache for later use. If a connection issue occurs, the Screenlet retrieves the list from the local cache. If the list doesn’t exist there, the Screenlet uses the delegate to notify the developer about the error.Use this policy to show the most recent version of the data when connected, but show an outdated version when there’s no connection.
cache-firstThe Screenlet loads the list from the local cache. If the list isn’t there, the Screenlet requests it from the portal and notifies the developer about any errors that occur (including connectivity errors).Use this policy to save bandwidth and loading time in case you have local (but probably outdated) data.

Required Attributes

  • recordSetId
  • labelFields

Attributes

AttributeData typeExplanation
recordSetIdnumberThe ID of the DDL being called. To find the IDs for your DDLs, click AdminContent from the Dockbar. Then click Dynamic Data Lists. Each DDL’s ID is in the table’s ID column.
userIdnumberThe ID of the user to filter records on. Records aren’t filtered if the userId is 0. The default value is 0.
labelFieldsstringThe comma-separated names of the DDL fields to show. Refer to the list’s data definition to find the field names. To do so, click AdminContent from the Dockbar. Then click Dynamic Data Lists and click the Manage Data Definitions button. You can view the fields by clicking on any of the data definitions in the table that appears. Note that the appearance of these values depends on the Theme selected by the user.
offlinePolicystringThe offline mode setting. The default value is remote-first. See the Offline section for details.
autoLoadbooleanWhether the list loads automatically when the Screenlet appears in the app’s UI. The default value is true.
refreshControlbooleanWhether a standard iOS UIRefreshControl appears when the user performs the pull to refresh gesture. The default value is true.
firstPageSizenumberThe number of items retrieved from the server for display on the first page. The default value is 50.
pageSizenumberThe number of items retrieved from the server for display on the second and subsequent pages. The default value is 25.
obcClassNamestringThe name of the OrderByComparator class to use to sort the results. Omit this property if you don’t want to sort the results. You can only use comparator classes that extend OrderByComparator<DDLRecord>. You can also create your own comparator classes that extend OrderByComparator<DDLRecord>.

Methods

MethodReturnExplanation
loadList()booleanStarts the request to load the list of records. The list is shown when the response is received. This method returns true if the request is sent.

Delegate

The DDL List Screenlet delegates some events in an object that conforms to the DDLListScreenletDelegate protocol. This protocol lets you implement the following methods:

  • - screenlet:onDDLListResponseRecords:: Called when a page of contents is received. Note that this method may be called more than once; once for each retrieved page.

  • - screenlet:onDDLListError:: Called when an error occurs in the process. The NSError object describes the error.

  • - screenlet:onDDLSelectedRecord:: Called when an item in the list is selected.

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