Efficient Data Retrieval and UI Binding To Value Help: Using Batch Requests with OData in SAPUI5

I have observed that there is limited content available regarding the process of sending batch requests from SAPUI5 applications to OData services, receiving the response, and subsequently binding the retrieved data to a Combo Box for value help

So in this Blog I would like to explain create a Combo Box using XML, Send a batch request from SAP UI5 and Bind the data to Combo Box for Value Help.

What is a batch Request?

In SAP OData, a batch request is a mechanism for sending multiple HTTP requests as a single batch to the OData service endpoint. Instead of sending individual HTTP requests for each operation, such as read, create, update, or delete, you can group multiple operations into a single batch request.

Step 1 - Creating Combo Box for drop down using XML

<ComboBox id = 'idProductType' items="{path: '/'}" > " Path should be "/"

<items>

"product_type and product_name should be your entity type Properties from OData service 

<core:Item key="{product_type}" text="{product_name}"></core:Item>

</items>

</ComboBox>

Step 2 - ODATA Entity Set 

Step 3 - Populating the data for Drop Down Values

Step 4 - Sending the BATCH request from UI5 Application.

var oModel = new sap.ui.model.odata.v2.ODataModel("Service URL"); "Service URL will be the same configured in Manifest.Json

                var entitySet = ["/Your Entity Set name from ODATA"];

                var prodcutType = [ ];

                var oComboBox = this.byId("idProductType"); "Id from XML view

                var onSuccess = function (oData) {

                    console.log("Request successful", oData);

                    var aResponses = oData.results;

                    for (var i = 0; i < aResponses.length; i++) {

                        var oResponseData = aResponses[i];

                        productType = productType.concat(oResponseData);

                    }

                }

                "Create Json model for Combo Box

                var oModelComboBox = new sap.ui.model.json.JSONModel();

                oComboBox.setModel(oModelComboBox);

                oModelComboBox.setData(productType);

                "Error if Batch Request Fails

                var onError = function (oError) {

                    console.error("Error:", oError);

                };

                var mParameters = {

                    batchGroupId: "myBatchGroup",

                    success: onSuccess,

                    error: onError

                };

                oModel.read(entitySet, mParameters);

                oModel.submitChanges(mParameters);