It contains settings, delimited by a comma. Ranch Hand Posts: 115. posted 9 years ago. The parent page can send a message to the child using the window.postMessage() function. Change Size of Iframe Automatically to Fit Content & Prevent Scrollbars, The parent page can communicate with the child by first saving the handle of the child window (the return value from. In the case of different domains communication is done through HTML5's message passing. By using this site, ... and assign a value from the child window to the parent window text field: opener.document.forms["xxx"].elements["yyy"].value = valuename; At this stage I would like to call another javascript function coded in the parent window