如何在 UI5 中使用 JSON 模型属性作为 OData v4 列表绑定的路径

Question

I try to display a list of objects from an OData V4 service in SAP UI5. I would like to use a property from a JSON Model to set the binding path for the list items.

I thought I can just set the path in the items aggregation of the table:

<Table
  items="{
    path: '{appView>/dataPath}',
    parameters: {
      $count: true,
      $$updateGroupId: 'peopleGroup'
    }
  }">...</Table>

and of course define and set the model:

var oViewModel = new JSONModel({
  dataPath: "/People"
});

this.getView().setModel(oViewModel, "appView");

For some reason the data is not loaded. There is not even items binded to the table:

oTable.getBinding("items");  // undefined

The JSON Model is defined in the init method of the controller.

Anybody has an idea why this is not working?

Answer 1

As per my understanding you want to bind path dynamically.in such case you can write template in xml without any path then in controller you have write bind path XML View:

<Table id="tblData" items="{}"> <items> **template code ** </items> </Table>

Controller:

var oTable = this.getView().byId("tblData"),
    sPath = this.getModel("appView").getProperty("/dataPath"),
    oBinding = oTable.bindItems({path: sPath});

for filters:

oBinding.filter(aFilters);

Answer 2

items: "{ path: '{appView>/dataPath}',

Anybody has an idea why this is not working?

Binding definitions apply only for ManagedObject's properties and aggregations. As path is just a plain object property, trying to bind anything there will be ignored.

Answer 3

Since you want to bind the Table to the result of the {appView>/dataPath} binding, I think you need to use Expression Binding to solve this.

items="{
    path: '{= ${appView>/dataPath}}',
    parameters: {
      $count: true,
      $$updateGroupId: 'peopleGroup'
    }