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populate with text from an ajax call (json)

Im retrieving some text via an ajax call (Json) and want to populate the html editor with this text.  The html editor is inside a form.  I cant get it to work.  I get an instance of the form, then try to locate the html editor within that form and finally place the data inside it.  Heres the code ive used so far

var frm = document.querySelector("#frmAddDisclaimer");

                    if ("htmlEditorDisclaimer_editor" in frm.elements) {
                        frm.elements["htmlEditorDisclaimer_editor"].value = data.DisclaimerText;

the frm varaibale exists and has properties and data.DisclaimetText has text in it, but the control isnt being populated.  How can I do this ?