Example / explanation for push request ?

Question

Hi,
can someone provide me a working example of soure code which creates a push request (Header + body) to an existing SAP NetWeaver Gateway Service?  My goal is to read a textfield input and transfer this information to an existing Service.
<Label text="PO number"/>
<Input id="purchaseOrderInput" type="Text" width="50%" placeholder="Enter a PO number ..."/>
<Label text="Reason" required="true"/>
<Input id="reasonInput" type="Text" width="80%" placeholder="Enter a Reason ..."/>
-<c:MatrixLayout id="matrix">
     -<c:MatrixLayoutRow>
          -<c:MatrixLayoutCell hAlign="Right">
               <Button text="Close" press="onClose"/>
          </c:MatrixLayoutCell>
          -<c:MatrixLayoutCell hAlign="Left">
              <Button text="Open" press="onOpen"/>
          </c:MatrixLayoutCell>
     </c:MatrixLayoutRow>
</c:MatrixLayout>
onOpen : function(oEvent) {
  var purchaseOrder = this.getView().byId("purchaseOrderInput")
  .getValue();
  var reason = this.getView().byId("reasonInput").getValue();
  if (purchaseOrder == null || purchaseOrder == '') {
  var msgClose = 'Please enter a Purchase Order!';
  sap.m.MessageToast.show(msgClose, {
  at : "Center"
  } else {
  var msgClose = 'ok! open';
  sap.m.MessageToast.show(msgClose, {
  at : "Center"
Many thanks
Best regards
Dominik

Answer 1

Hi,
I am not sure if we have SAP NetWeaver 7.4. I will have a look. But nevertheless I am searching for a solution like discussed in both following links:
datajs - JavaScript Library for data-centric web applications - Documentation
Building a CRUD Application with SAPUI5 Using Odata Model
Up to now i have following source code implemented:
var poOpen = {poNumber: purchaseOrder, reason: reason};
var serviceURI = this.getUrl("/sap/opu/odata/sap/MY_SERVICE/purchaseOrder");
var request = { headers: {"X-Requested-With": "XMLHttpRequest",
                         "Accept": "application/atom+xml,application/atomsvc+xml,application/xml"
                         "Content-Type": "application/atom+xml",
                         "DataServiceVersion": "2.0" },
                         requestUri: serviceURI,
                         method: "PUT",
                             data: poOpen };
That is EntitySet on SAP NetWeaver Gateway. (called: purchaseOrder)
Is the starting szenation correct? I am not realy sure about the URI. Is it mandatory to add some data to the link (URI) like po number?
Many thanks.
Best regards.
Dominik