how to retrieve a value from a lookup field in CRM 2015 with JavaScript

How can I retrieve the email of a contact when I already have their ID?

function getEmailFromContactID(){
var contactId, contactName, contactEmail, contactObject;

    // mbmhr_employee is the lookup field name that we want to retrieve values from
    contactObject = Xrm.Page.data.entity.attributes.get('mbmhr_employee');
    if (contactObject.getValue() != null) {
        contactId = contactObject.getValue()[0].id;
        contactName = contactObject.getValue()[0].entityType;
        contactEmail = contactObject.getValue()[0].email;

Xrm.Page.getAttribute("mbmhr_test22").setValue(contactEmail);    

    }    
}
javascriptdynamics-crm-2015

Answer №1

In order to obtain more information about related records, you must make a request to the server.

Check out the following resources to help you get started in the correct path: Learn how to use CRM 2011 Javascript REST API and Using OData queries in CRM 2013 with Javascript.

Answer №2

Utilizing the OData endpoint once more for a solution:

let employeeId = null;
try { 
    employeeId = Xrm.Page.getAttribute('mbmhr_employee').getValue()[0].id; 
} catch(error) { 
    employeeId = null; 
}

if(employeeId !== null) {
    let request = new XMLHttpRequest();
    let url = Xrm.Page.context.getClientUrl() + "/XRMServices/2011/OrganizationData.svc/EmployeeSet(guid'" + employeeId + "')?$select=EmailAddress";
    request.open("GET", url, true);
    request.setRequestHeader("Accept", "application/json");
    request.setRequestHeader("Content-Type", "application/json; charset=utf-8");
    
    request.onreadystatechange = function() {
        if(request.readyState == 4) {
            let responseData = JSON.parse(request.responseText);
            // utilize responseData.d.EmailAddress 
        }
    };
    
    request.send(null);
}

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