Q: Getting a value from a very simple web-service

[mario_maisto]

Hey guys,

i am having a slight problem with I hope a very easy question for you. I am trying to read a single value (Formid) from a web-service that has only the read (GetEntity) function to a value in javascript.

The service has  a dummy input and an output that is a Globally Unique Identifier (Formid). The service works properly :

But I cant get the value to my javascript variable. Am I trying to get it wrong? The code is as follows :

onInit: function() {
        var sServiceUrl = "http://my.uri.domain:port/sap/opu/odata/sap/GENERATE_GUID_SRV_01/";
        var oModel = new sap.ui.model.odata.ODataModel(sServiceUrl, true);
        var oJsonModel = new sap.ui.model.json.JSONModel();

        oModel.read("/guidSet('X')?", null, null, true, function(oData, response) {
            oJsonModel.setData(oData);

        });

        sap.ui.getCore().setModel(oJsonModel);
        var formId = sap.ui.getCore().getModel().getProperty("{/Formid}");
        alert(formId); //SOMEWHY IS NULL

    },

I hope You can help me,

Mario.

[former_member182372 · Accepted solution]

1. oModel.read("/guidSet('X')?", {
2. success : function(oData, response) { 
3. var oJsonModel = new sap.ui.model.json.JSONModel(); 
4. oJsonModel.setData(oData.results); 
5.              
6. sap.ui.getCore().setModel(oJsonModel); 
7. var formId = sap.ui.getCore().getModel().getProperty("/Formid"); 
8. alert(formId); //SOMEWHY IS NULL 
10.         }
11. 
    
12. }); 

[mario_maisto · Accepted solution]

Hey Maksim,
thank You for the quick response !
I tried your suggested code, but it did not work. The alert now displays 'undefined'.
Any suggestions?

[former_member182372 · Accepted solution]

No ? mark at tthe end

1. oModel.read("/guidSet('X')", {

[former_member182372 · Accepted solution]

actually what is the purpose of that 'X'??

can't you just do /guidSet ?

1. oModel.read("/guidSet", {
2. success : function(oData, response) {
3. var oJsonModel = new sap.ui.model.json.JSONModel();
4. oJsonModel.setData( { Formid : oData.results[0].Formid } );
5.             
6. sap.ui.getCore().setModel(oJsonModel);
7. var formId = oData.resultssap.ui.getCore().getModel().getProperty("/Formid");
8. alert(formId); //SOMEWHY IS NULL
10.         }
12. });

[mario_maisto · Accepted solution]

Changed it to :

oModel.read("/guidSet('X')", {
            success: function(oData, response) {
                var oJsonModel = new sap.ui.model.json.JSONModel();
                oJsonModel.setData(oData.results);

                sap.ui.getCore().setModel(oJsonModel);
                var formId = sap.ui.getCore().getModel().getProperty("/Formid");
                alert(formId);
            }

        });

It still says undefined.

[mario_maisto · Accepted solution]

As I don't have an entitySet implemented (only Get Entity - read), the simple /guidSet does not work. The value X is a dummy input (I wanted the service to send  only the Formid, but the read needed an input also).It is quite confusing to me, because when I go to my.uri.domain:port/sap/opu/odata/sap/GENERATE_GUID_SRV_01/guidSet('X') the Formid value is right there, .. just how to get it.

[former_member182372 · Accepted solution]

Try

1. oModel.read("/guidSet(Dummy='X')", { 

[Private_Member_15166 · Accepted solution]

Hi Mario,

Do like this and see if it's working.

                    var oModel = "http://my.uri.domain:port/sap/opu/odata/sap/GENERATE_GUID_SRV_01/"; 

              var sRead = "/guidSet(DUMMYVARIABLENAME='X')"  ;

              oModel.read( sRead, null, null, true, function(oData, oResponse){

              var formId = oData.formId;

              },function(){

            alert("Read failed");});

or you may also use proxy in your URL.

var oModel = "proxy/http/my.uri.domain:port/sap/opu/odata/sap/GENERATE_GUID_SRV_01/"; 

See here if you are getting your formId.

Also check if you are getting your data in console.

console.log(oModel);

Regards

Dhananjay

[mario_maisto · Accepted solution]

Hey Maksim,

Got it now !!

I changed the oData.results (as I don't have sets) to just oData and got the value!

oModel.read("/guidSet('X')", {

            success: function(oData, response) {

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

                oJsonModel.setData(oData);

                sap.ui.getCore().setModel(oJsonModel);

                var formId = sap.ui.getCore().getModel().getProperty("/Formid");

                alert(formId);

            }

        });

Thanks a lot for your help!