Dynamics CRM 2015 Update 1: Applying custom FetchXml to a subgrid using JavaScript

Hi all,

In today's post I would like to discuss the working code to apply custom FetchXml to a subgrid using JavaScript in Dynamics CRM 2015 update 1.

In this code snippet, I am trying to populate a grid in the opportunity form with all the opportunities that have the same account associated with them as the present opportunity once a value is present in the Account field. So I bind this method to the onLoad of the opportunity form and also to the onChange of the account field.

///method to filter the opportunities and show only those opportunities that share the same account
function filterRelatedOpportunitiesSubGrid() {  
 
////window.parent to account for the latest changes in turbo forms in Dynamics CRM
        var relatedProjectsSubGrid = window.parent.document.getElementById("RelatedProjects");
        if (null != relatedProjectsSubGrid) {
            var parentAccountId = "parentaccountid";
            var selectedCustomer = controlExists(parentAccountId) ? Xrm.Page.getAttribute(parentAccountId).getValue() : null;
            if (selectedCustomer != null) {
             
                var accountId = selectedCustomer[0].id;
                if (accountId != null) {
                    var fetchXml = "<fetch distinct='false' mapping='logical' output-format='xml-platform' version='1.0'>" +
                        "<entity name='opportunity'>" +
                        "<attribute name='name'/>" +
                        "<attribute name='opportunityid'/>" +
                        "<attribute name='parentaccountid'/>" +
                        "<order descending='false' attribute='name'/>" +
                        "<filter type='and'>" +
                        "<condition attribute='parentaccountid' value='" + accountId + "' operator='eq'/>" +
                        "</filter>" +
                        "</entity>" +
                        "</fetch>";
                    if (relatedProjectsSubGrid.control != null) {
                        relatedProjectsSubGrid.control.SetParameter("fetchXml", fetchXml);
                        relatedProjectsSubGrid.control.Refresh();
                     
                    } else {
                        ////try again if the control property has not loaded completely
                        setTimeout(function () { filterRelatedOpportunitiesSubGrid(); }, 2000);
                    }
                }
            }
        } else {
           ////Try again in case the sub-grid has not loaded yet
            setTimeout(function () { filterRelatedOpportunitiesSubGrid(); }, 2000);
        }
    }

function controlExists(controlName) {
    var control = Xrm.Page.getControl(controlName);
    var attribute = Xrm.Page.getAttribute(controlName);
    return control != null && attribute != null;
}