Dialog (macro), how to catch when cancel button is pressed

 Here is a the example in the help files. You will see that there is a section where you can place data in the created fields, and a section where you retrieve the data.

var test = 0;
     function myDialog()
     {
      //all member functions except for getPages can access the property "dialog" of the dialog class. Type is "UserDialog" (see help).
      //example: this.dialog.getPage(0)

      // returns DialogTemplate[] (see help) or the dialog XML ID
      // non-optional
      this.getPages = function()
      {
      var iDialogTemplate1 = Dialogs.createNewDialogTemplate(600, 200, "First page");
      iDialogTemplate1.PushButton(35, 5, 80, 15, "Press", "BUTTON_1");
      iDialogTemplate1.CheckBox(120, 5, 100, 15, "CheckMe", "CHECKBOX_1");
      iDialogTemplate1.ComboBox(10, 60, 100, 40, ["Value 1", "Value 3", "Value 2", "Value 4"], "COMBO_1");
      iDialogTemplate1.DropListBox(355, 60, 100, 40, ["sorted 1", "sorted 3", "sorted 2", "sorted 4"], "COMBO_4", 3); //sorted + editable
      iDialogTemplate1.Text(10, 170, 100, 16, "stat. Text");
      iDialogTemplate1.TextBox(120, 170, 100, 16, "TXT_EDIT_1");
      var iDialogTemplate2 = Dialogs.createNewDialogTemplate(400, 200, "Second page");
      iDialogTemplate2.Text(10, 10, 100, 16, "stat. Text");
      iDialogTemplate2.TextBox(10, 40, 100, 16, "TXT_EDIT_2");
      iDialogTemplate2.TextBox(10, 80, 150, 16, "TXT_EDIT_3");
      return [iDialogTemplate1, iDialogTemplate2];
      }

     //initialize dialog pages (are already created and pre-initialized with static data from XML or template)
     //parameter: Array of DialogPage
     //see Help: DialogPage
     //user can set control values
     //optional
     this.init = function(aPages)
     {
        //use this function also to store the page data locally (for example to access it in "onClose")
        aPages[0].setFocusedElement("TXT_EDIT_1");
        aPages[0].getDialogElement("TXT_EDIT_1").setText("Start value 1");

        aPages[1].getDialogElement("TXT_EDIT_2").setText("Start value 2");
        aPages[1].getDialogElement("TXT_EDIT_3").setText("Start value text 3");
        aPages[1].setFocusedElement("TXT_EDIT_2");
    }

    // returns true if the page is in a valid state. In this case OK, Finish, or Next is enabled.
    // called each time a dialog value is changed by the user (button pressed, list selection, text field value, table entry, radio button,...)
    // pageNumber: the current page number, 0-based
    this.isInValidState = function(pageNumber)
    {
        return true;
    }

    // returns true if the "Finish" or "Ok" button should be visible on this page.
    // pageNumber: the current page number, 0-based
    // optional. if not present: always true
    this.canFinish = function(pageNumber)
    {
        return true;
    }

    // returns true if the user can switch to another page.
    // pageNumber: the current page number, 0-based
    // optional. if not present: always true
    this.canChangePage = function(pageNumber)
    {
        return true;
    }

    //called after ok/finish has been pressed and the current state data has been applied
    //can be used to update your data
    // pageNumber: the current page number
    // bOK: true=Ok/finish, false=cancel pressed
    //optional
    this.onClose = function(pageNumber, bOk)
    {
    }

    //the result of this function is returned as result of Dialogs.showDialog(). Can be any object.
    //optional
    this.getResult = function()
    {
        return this.dialog.getPage(1).getDialogElement("TXT_EDIT_2").getText()
    }

    //other methods (all optional): on[ControlID]_pressed, _focusChanged(boolean lost=false, gained=true), _changed for edit and toggle buttons, _selChanged(int[] newSelection)
    this.BUTTON_1_pressed = function()
    {
        this.dialog.getPage(0).getDialogElement("TXT_EDIT_1").setVisible(false)
        this.dialog.getPage(1).getDialogElement("TXT_EDIT_2").setEnabled(false)
        test = 1;
    }
}

var result = Dialogs.showDialog(new myDialog(), Constants.DIALOG_TYPE_WIZARD, "Multi page dialog");
Dialogs.MsgBox(result)