How to call/launch/execute workflow and wait until its execution to make some action with JavaScript in Microsoft Dynamics CRM

Author of code for workflow executing is Jian Wang. I wrote a code that waits for the workflow to be completed.


So the code:

ExecuteWorkflow = function(entityId, workflowId)
{
    var xml = "" + 
    "<?xml version=\"1.0\" encoding=\"utf-8\"?>" + 
    "<soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\">" + 
    GenerateAuthenticationHeader() +
    "  <soap:Body>" + 
    "    <Execute xmlns=\"http://schemas.microsoft.com/crm/2007/WebServices\">" + 
    "      <Request xsi:type=\"ExecuteWorkflowRequest\">" + 
    "        <EntityId>" + entityId + "</EntityId>" + 
    "        <WorkflowId>" + workflowId + "</WorkflowId>" + 
    "      </Request>" + 
    "    </Execute>" + 
    "  </soap:Body>" + 
    "</soap:Envelope>" + 
    "";

    var xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
    xmlHttpRequest.Open("POST", "/mscrmservices/2007/CrmService.asmx", false);
    xmlHttpRequest.setRequestHeader("SOAPAction","http://schemas.microsoft.com/crm/2007/WebServices/Execute");
    xmlHttpRequest.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
    xmlHttpRequest.setRequestHeader("Content-Length", xml.length);
    xmlHttpRequest.send(xml);
    var resultXml = xmlHttpRequest.responseXML;
    return(resultXml.selectSingleNode('//soap:Envelope/soap:Body/ExecuteResponse/Response/Id').nodeTypedValue);
}

WaitWorkflowExecution = function(workflowId)
{
    var xml = "<?xml version='1.0' encoding='utf-8'?>"+ 
    "<soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'"+
    " xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'"+
    " xmlns:xsd='http://www.w3.org/2001/XMLSchema'>"+ 
    GenerateAuthenticationHeader() +
    "<soap:Body>"+ 
    "<Retrieve xmlns='http://schemas.microsoft.com/crm/2007/WebServices'>"+ 
    "<entityName>asyncoperation</entityName>"+ 
    "<id>"+workflowId+"</id>"+ 
    "<columnSet xmlns:q1='http://schemas.microsoft.com/crm/2006/Query' xsi:type='q1:ColumnSet'>"+ 
    "<q1:Attributes>"+ 
    "<q1:Attribute>statuscode</q1:Attribute>"+ 
    "</q1:Attributes>"+ 
    "</columnSet>"+ 
    "</Retrieve>"+ 
    "</soap:Body>"+ 
    "</soap:Envelope>";

    var xHReq = new ActiveXObject("Msxml2.XMLHTTP");
    xHReq.Open("POST", "/mscrmservices/2007/CrmService.asmx", false);
    xHReq.setRequestHeader("SOAPAction","http://schemas.microsoft.com/crm/2007/WebServices/Retrieve");
    xHReq.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
    xHReq.setRequestHeader("Content-Length", xml.length);
    xHReq.send(xml);
    var resultXml = xHReq.responseXML;

    var errorCount = resultXml.selectNodes('//error').length;
    if (errorCount != 0)
    {
        setTimeout("WaitWorkflowExecution('" + workflowId + "');", 1000);
        
    }
    else
    {
        var executionstatus = resultXml.selectSingleNode("//soap:Envelope/soap:Body/RetrieveResponse/RetrieveResult/q1:statuscode").nodeTypedValue;
    

        if (executionstatus == 30)//Workflow completed
        {
            alert("Workflow Completed!");
        }
        else
        {
            setTimeout("WaitWorkflowExecution('" + workflowId + "');", 1000);
        }
    }
}

var theWorkflowId = "6eb47269-4139-40b3-a96d-255ef2d78e6a"; //change to your workflow Id
var workflowInstanceId = ExecuteWorkflow(crmForm.ObjectId, theWorkflowId);

WaitWorkflowExecution(workflowInstanceId);