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Object_Page_Blocks_4527729.md

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view on: demo kit nightly build | demo kit latest release

Object Page Blocks

The contents of the subsections in the ObjectPageLayout control are organized into blocks.

The blocks are used to group the app content that is displayed in the sections and subsections of the ObjectPageLayout.

Object Page content grouped in Blocks

To add blocks, use the blocks aggregation of sap.uxap.ObjectPageSubSection:

 <ObjectPageLayout id="ObjectPageLayout" subSectionLayout="titleOnTop">
        <sections>
            <ObjectPageSection title="Payroll" >
                <subSections>
                    <ObjectPageSubSection title="sub payroll title">
                        <blocks>
                            <myNameSpace:myBlock/>
                            <myNameSpace:myBlock/>
                            <myNameSpace:myBlock/>
                        </blocks>
                    </ObjectPageSubSection>
                </subSections>
            </ObjectPageSection>
        </sections>
    </ObjectPageLayout>

Any control can be a block. However, the blocks that extend sap.uxap.BlockBase provide additional features:

  • Lazy loading: Only the blocks that are currently displayed and those in their direct proximity are instantiated

  • Column layout: Blocks provide information to the subsection only on the width they should be using for an optimal experience

Blocks API & Guidelines

Blocks that are used in an ObjectPageLayout have to comply with the following rules regarding their API. They must:

  • Extend sap.uxap.BlockBase

    sap.uxap.BlockBase.extend("<BlockName>", {
        metadata: {
         }
     });

  • Support the modes described in sap.uxap.ObjectPageSubSectionMode.type - Collapsed and Expanded. For each mode, declare its associated view. It is recommended you use the XML view if no templating is needed:

    sap.uxap.BlockBase.extend("<BlockName>", {
        metadata: {
            views: {
                Collapsed: {
                    viewName: "<collapsedViewName>",
                    type: "XML"
                },
                Expanded: {
                    viewName: "<expendedViewName>",
                    type: "XML"

                }
            }
         }
     });

  • Come with their own controller (if needed). This controller should just react to the internal events of the block, as the ObjectPageLayout's own controller should only manage the page and its sections and subsections.

  • Follow the OpenUI5 naming guidelines: see Related Information

  • Use the modelMapping mechanism to declare distinct model per logical entity.

Example:

Let's consider an Employee Goals block that displays an employee together with his or her goals.

One Employee model for the employee entity:

<Text text="{Employee>FirstName}"></Text>

One Goals model for the goal collections:

<List items="{Goals>}">

In one backend service, goals may be a navigation property of employees, but in another this may not be the case. For this reason, when implementing the Employee Goals block, you should use two distinct models in the block views.

Example:

An app wants to use the Employee Goals blocks described above. These are therefore embedded into a page that has a model named ApplicationModel, in which Goals are a navigation property of employees:

<EmployeeGoals>
    <mappings>
        <uxap:ModelMapping externalModelName="ApplicationModel" externalPath="/Employee('121')" internalModelName="Employee" />
        <uxap:ModelMapping externalModelName="ApplicationModel" externalPath="/Employee('121')/Goals" internalModelName="Goals" />
    </mappings>
</EmployeeGoals>

A second app uses the same blocks, but in its service, Goals and Employees are unrelated entities:

<EmployeeGoals>
    <mappings>
        <uxap:ModelMapping externalModelName="ApplicationModel2" externalPath="/Employee('121')" internalModelName="Employee" />
        <uxap:ModelMapping externalModelName="ApplicationModel2" externalPath="/Goals" internalModelName="Goals" />
    </mappings>
</EmployeeGoals>

BlockBase interprets this in the following order:

  1. Looks for a model with the name specified in the externalModelName.

  2. Sets this model on itself with the name specified in the internalModelName.

  3. Creates a context corresponding to the path.

Note:

This model mapping is not mandatory as models used in a view can also be provided by standard OpenUI5 techniques (model inheritance, setModel).

Standard Block Implementation

The standard block implementation is to extend the sap.uxap.BlockBase control and inherit the default implementation of setMode and rendering. setMode in BlockBase supports two different ways of building blocks:

  • Single view blocks: A single XML view is used for all layout modes. This XML view should be named <name>.view.xml.

  • Multiple view blocks: Different views are provided for the different layout modes.

    • These views should be added in the views section of the block metadata (this section is added by the BlockBase class).

    • For each mode, the BlockBase class must declare a view name and type:

      sap.uxap.BlockBase.extend("<BlockName>", {
        metadata: {
            views: {
                Collapsed: {
                    viewName: "<collapsedViewName>",
                    type: "XML"
                },
                Expanded: {
                    viewName: "<expendedViewName>",
                    type: "XML"
                }
            }
         }
     });

Related Information

Creating Blocks

API Reference: sap.uxap.BlockBase