ExecuteAction.js

CopyOpportunity: function (primaryControl) {
        try {
            //showProgressIndicatior
            Xrm.Utility.showProgressIndicator("Please wait while processing your request");

            //Save current record first once copy button is getting clicked
            primaryControl.data.save().then(function () {
                var recordURL = primaryControl.getUrl();
                var actionName = "ad_CloneRecord";
                executeAction(recordURL, actionName, primaryControl);
            },
                function () {
                    alert("An Error has occured. Please contact with your System Administrator.");
                });

        } catch (error) {
            Xrm.Utility.closeProgressIndicator();
            console.log(error);
            throw "An Error has occured. Please contact with your System Administrator.";
        }
    },

    executeAction: function (recordURL, actionName, primaryControl) {
        var req = {};
        req.RecordURL = recordURL;
        req.Prefix = prefix;
        req.FieldsToIgnore = fieldsToIgnore;

        req.getMetadata = function () {
            return {
                boundParameter: null,
                parameterTypes: {
                    "RecordURL": {
                        typeName: "Edm.String",
                        structuralProperty: 1
                    },
                    "Prefix": {
                        typeName: "Edm.String",
                        structuralProperty: 1
                    },
                    "FieldsToIgnore": {
                        typeName: "Edm.String",
                        structuralProperty: 1
                    },
                },
                operationType: 0,
                operationName: actionName
            };
        };

        var successCallbackExc = function (result) {};

        var errorCallbackExc = function (error) {
            Xrm.Utility.closeProgressIndicator();
            alert(error.message);
        };

        Xrm.WebApi.online.execute(req).then(successCallbackExc, errorCallbackExc);
    },