Dyn365WebApiHelper.js

/// <reference path="../MSXRMTOOLS.Xrm.Page.2016.js" />

// Declaring our Namespace
var MindsUnitedCourse = MindsUnitedCourse || {};
MindsUnitedCourse.WebApi = (function () {

    // Helper method for calling the WebApi
    function _callWebApi(method, collection, querystring, postData, successCallBack, errorCallBack) {

        // Get the client Url
        var clientUrl = Xrm.Page.context.getClientUrl(),
            // Create a XMLHttpRequest
            request = new XMLHttpRequest();

        // Build the request using the provided collection and querystring
        request.open(method, clientUrl + "/api/data/v8.1/" + collection + (querystring || ""), true);
        // Add the required headers for OData
        request.setRequestHeader("Accept", "application/json");
        request.setRequestHeader("Content-Type", "application/json; charset=utf-8");
        request.setRequestHeader("OData-MaxVersion", "4.0");
        request.setRequestHeader("OData-Version", "4.0");

        // Bind the onload, which only fires when a XHR requests finishes (regardless of status)
        request.onload = function () {
            // Parse any response data we may have
            var data = {};
            try {
                data = JSON.parse(this.response);
            } catch (err) { data = {}; }

            // Check if returned status code is within the OK range
            if (this.status >= 200 && this.status < 400) {
                // Success!
                // If status is 204, then a new record was created and we'll need to get it's ID
                if (this.status == 204) data.NewEntityId = this.getResponseHeader("OData-EntityId");
                // Call the successCallBack with the data that was returned
                if (!!successCallBack) successCallBack(data);
            } else {
                // We reached our target server, but it returned an error
                // Call the errorCallBack with the statuscode and any error returned by the Api
                if (!!errorCallBack) errorCallBack(this.status, typeof data.error != "undefined" ? data.error : null);
            }
        };

        request.onerror = function () {
            // There was a connection error of some sort, call the errorCallBack
            if (!!errorCallBack) errorCallBack();
        };

        // If postdata was included, send that
        if (!!postData) request.send(typeof postData != "string" ? JSON.stringify(postData) : postData);
        else request.send();
    }

    function _create(entitySetName, entityData, successCallBack, errorCallBack) {
        return _callWebApi("POST", entityData, null, entityToCreate, function (data) {
            if (!!data && !!data.NewEntityId) successCallBack(data.NewEntityId);
            else errorCallBack(-1, data);
        }, errorCallBack);
    }
    function _get(entitySetName, queryString, successCallBack, errorCallBack) {
        return _callWebApi("GET", entitySetName, queryString, null, successCallBack, errorCallBack);
    }
    function _update(entitySetName, id, entityData, successCallBack, errorCallBack) {
        return _callWebApi("PATCH", entitySetName, '(' + id + ')', entityData, successCallBack, errorCallBack);
    }
    function _delete(entitySetName, id, successCallBack, errorCallBack) {
        return _callWebApi("DELETE", entitySetName, '(' + id + ')', null, successCallBack, errorCallBack);
    }

    return {
        'create': _create,
        'get': _get,
        'update': _update,
        'delete': _delete,
        'callWebApi': _callWebApi
    };


})();