test.js

var TXHelper = (function (tx) {
  
  tx.textFormFields = {

    convertFromSelection: function (name, id) {
      
      // get current selection
      var sel = TXTextControl.selection;

      sel.getLength(function(selLength) {
        
        if (selLength > 0) { // text is selected
        
          sel.getText(function(selText) {
            
            // store text
            var text = selText;
            sel.setText(""); // remove selected text
            
            TXTextControl.formFields.getCanAdd(canAdd => {
              if (canAdd) { // can add the field here?

                // add form field
                TXTextControl.formFields.addTextFormField(600, ff => {
                  ff.setText(text);
                  
                  // set field properties
                  if (name) ff.setName(name);
                  if (id) ff.setID(id);
                });

              } else { // there is a field at that location
                console.log("A field cannot be added at this location.");
              }
            });
          });
        }
        else { // no text is selected
          console.log("Nothing is selected.");
        }
      });
      
    },

  };
  
  return tx;

} ( TXHelper || {} ));