Send value from popup (Child) to parent

Your question is not clear, but from what I was outputting you want to get the value of the textbox from the parent window in the child window.

You can do something like this -

var win = window.open('<Window URL>');
win.contentWindow.SetValueOfTextBox(parentWindowTextBoxValue);

      

        
        
        
      

    

Here win

is the instance of the window you opened.

You will need to define the function SetValueOfTextBox

in the new window you opened. This function will take a string and set that value to a text box on this page. You just need to call this function from the parent window passing a text field to it.