Jquery Ajax call example

function GetXrmElement() {
function CreateDebitTransaction() {                
                var Params = {
                    Leader : “Col. Hannibal Smith”,
                    Driver: “Cor. BA Baracus”,
                    Logistics: “Sgt Pedelton”,
                    pilot: “Lef Mardoc”
                };
                $.ajax({
                    type: "GET",
                    url: // ,
                    data: JSON.stringify(Params),                
                    data: Params,
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (result) {                        
                 // success method call back
                    },
                    error: function (xhr, ajaxOptions, thrownError) {
                        alert("Error Occured while executing the requese.");
                        return;
                    }
                });
            }

above is an asynchronous, non cross browser supported method. synchronous calls does not support jsonp. we can use async attribute but it has some limitations.

according to JQuery API documentation,

async (default: true)
Type: Boolean
By default, all requests are sent asynchronously (i.e. this is set to true by default). If you need synchronous requests, set this option to false. Cross-domain requests and dataType: "jsonp" requests do not support synchronous operation. Note that synchronous requests may temporarily lock the browser, disabling any actions while the request is active. As of jQuery 1.8, the use of async: false with jqXHR ($.Deferred) is deprecated; you must use the success/error/complete callback options instead of the corresponding methods of the jqXHR object such as jqXHR.done() or the deprecated jqXHR.success().

to make it look like sync call i normally put the continuation of the code in the success or error method. not the best work around but work around none the less.

for cross domain purposes some websites say using headers like below resolves the issue. although i have not tested it.

function GetXrmElement() {
headers: { 'Access-Control-Allow-Origin': '*' }
/* may work ??
beforeSend: function (request) {
       //request.setRequestHeader("Access-Control-Allow-Origin: ", "*")
},*/

Passing Xrm Object from parent page(CRM) to child

Some times we need open a new window from CRM. This new window can be a window a that you open with a simple simple window.open() code. Or it can be a web resource that you want to open dynamically. Most of the time you need the Xrm object on that child page. I've written two small javascript function to pass Xrm object between parent and master page.

function GetXrmElement() {

                //to check if its an iframe
                var IframeCheck = isIframe();
                if (!IframeCheck) {
                    //support for CRM 4.0
                    if (window.opener != null && window.opener.Xrm != null) {
                        Xrm = window.opener.Xrm;
                    }
                        //CRM 2011 and upwords
                    else if (window.top != null && window.top.opener != null
                        && window.top.opener.parent != null && window.top.opener.parent.Xrm != null) {
                        Xrm = window.top.opener.parent.Xrm
                    }
                    else if (this.parent != null && this.parent.Xrm != null)
                        Xrm = this.parent.Xrm;

                    else if (window.top != null) {
                        Xrm = window.top.Xrm;
                    }


                    else {
                        Xrm = null;
                    }
                }

                else {
                    if (this.parent != null && this.parent.Xrm != null)
                        Xrm = this.parent.Xrm;
                    else if (document.parentWindow != null && document.parentWindow.parent != null && document.parentWindow.parent.Xrm != null)
                        Xrm = document.parentWindow.parent.Xrm;
                    else if (window.top != null)
                        Xrm = window.top.Xrm;
                    else
                        Xrm = null;
                }

                if (Xrm == null)
                    alert("Cannot retrieve Xrm object");
            }