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//CALL Function ----       typeInTextarea($('[name=additional_field_1]'), '{Name}');

function typeInTextarea(el, newText) 
   {
    var start = el.prop("selectionStart")
    var end = el.prop("selectionEnd")
    var text = el.val()
    var before = text.substring(0, start)
    var after  = text.substring(end, text.length)
    el.val(before + newText + after)
    el[0].selectionStart = el[0].selectionEnd = start + newText.length
    el.focus()
}