How to retrieve field values of SharePoint form from another form opened in dialog


In this article, you will find the instructions for passing values ​​from a parent form to a child form, which is opened in the dialog box.


Suppose that a company possesses a set of facilities and requires a facility management system. In case of any problem at a facility, a user creates an issue in this system. This issue is assigned to a specific manager who is responsible for this facility. Each issue can have several tasks.

To speed up a task creation, we will set up prepopulation of the necessary information from a parent form, e.g. 'Facility', 'Priority', and 'Assigned to'.


First of all, we will create 3 lists:

  • Facilities;
  • Issues;
  • Tasks (a regular Tasks list).

Facilities list will store the information about facilities and their managers:

  • Title;
  • Manager.

Issues list will contain the following columns:

  • Title (text field);
  • Facility (lookup field);
  • Manager (person or group field);
  • Description (plain text field);
  • Priority (choice field).

And the Tasks list will be based on a regular SharePoint Tasks list with just two extra columns:

  • Issue (a lookup field pointing to the Issues list);
  • Facility (a lookup field pointing to the Facilities list).

Issue form

Here is a simple Issue form containing all the fields from the Issues list plus a 'List or Library' control bound to the Tasks list and displaying issue's tasks.

Issue form

To be able to pass values from a parent form to a child form, we need to define fd globally in the parent form with the code:

window.fd = fd;


Since each facility has a manager, we'll populate the Manager field, when the Facility changes. To do this, we will add the following code into JavaScript editor:

window.fd = fd;

fd.spRendered(function() {

    fd.field('Facility').$on('change', function () {
        fd.field('Manager').value = fd.field('Facility').value.Manager.EMail;

Task form

Here is a form of the Tasks list:

Task form

Here we will populate Priority, Facility, and Assigned To fields with values from the parent form.

To get access to the parent form's fields, we will use '' property which returns the topmost window object. And this is the code which we put into the task form:

fd.spRendered(function() {
    var parentForm =;

    if (parentForm) {

        //Set field values with the values from the parent on form load
        fd.field('Facility').value = parentForm.field('Facility').value.ID;
        fd.field('Priority').value = parentForm.field('Priority').value;
        fd.field('AssignedTo').value = parentForm.field('Manager').value;

        //Disable Location field
        fd.field('Facility').disabled = true;