No puedo validar mi formulario antes de enviarlo a mi hoja de cálculo. Una vez que hago clic en enviar no hace nada ...

Tampoco estoy seguro de cómo validar la fecha para asegurarme de que esté en el formato correcto antes del envío. He intentado configurar la validación, pero antes de poder probarlo, debo poder enviar y obtener los resultados de la validación.

¿Qué estoy haciendo mal? He incluido el siguiente código:

    function doGet() {
      var app = UiApp.createApplication().setTitle('DHS: Kurzweil Calendar');

      //Create a panel which holds all the form elelemnts
      var vrtMainPanel = app.createVerticalPanel().setId('vrtMainPanel');

      //Create Spreadsheet Source
      var spSheet = SpreadsheetApp.openById('0Aur3owCpuUY-dFF0dVZXb3I1Yjlpbzg3SXFIaklEcUE');
      var spTeacherList = spSheet.getSheetByName('TeacherList');
      var spSubjectList = spSheet.getSheetByName('SubjectList');
      var spPeriodList = spSheet.getSheetByName('PeriodList');
      var spCountList = spSheet.getSheetByName('CountList');

      //Create the form elements
      var hdlTeacherName = app.createServerHandler('getTeacherName').addCallbackElement(vrtMainPanel);
      var lbxTeacherName = app.createListBox().setId('lbxTeacherName').setName('lbxTeacherName').addChangeHandler(hdlTeacherName);
      var lstTeacherNames = spTeacherList.getRange(1,1,spTeacherList.getLastRow(),1).getValues();
          lstTeacherNames.sort();

          for (var l = 0; l < lstTeacherNames.length; l++) {
            lbxTeacherName.addItem(lstTeacherNames[l],l);
          }

      var lblTeacherName = app.createLabel('Teacher Name:');
      var txtTeacherName = app.createTextBox().setName('txtTeacherName').setId('txtTeacherName').setVisible(false);

      var lblExt = app.createLabel('Ext:');
      var txtExt = app.createTextBox().setName('txtExt').setId('txtExt');

   //Set DateBox to Tomorrow's Date
      var tomorrow =new Date(new Date(new Date().setHours(0,0,0,0)).setDate(new Date().getDate() + 1));// set hours, min, sec & milliSec to 0 and day=day+1
      //Logger.log(tomorrow);
      var lblDate = app.createLabel('Date of Test:');
      var boxDate = app.createDateBox().setId('boxDate').setName('boxDate').setFormat(UiApp.DateTimeFormat.DATE_SHORT).setValue(tomorrow);

      var lbxSubject = app.createListBox().setId('lbxSubject').setName('lbxSubject');
      var lstSubjects = spSubjectList.getRange(1,1,spSubjectList.getLastRow(),1).getValues();
          lstSubjects.sort();

          for (var l = 0; l < lstSubjects.length; l++) {
            lbxSubject.addItem(lstSubjects[l]);
          }

      var lbxPeriod = app.createListBox().setId('lbxPeriod').setName('lbxPeriod');
      var lstPeriods = spPeriodList.getRange(1,1,spPeriodList.getLastRow(),1).getValues();
          lstPeriods.sort();

          for (var l = 0; l < lstPeriods.length; l++) {
            lbxPeriod.addItem(lstPeriods[l]);
          }

      var lblStudentNum = app.createLabel('Number of Students:');
      var lbxStudentNum = app.createListBox().setId('lbxStudentNum').setName('lbxStudentNum');
      var lstStudentNums = spCountList.getRange(1,1,spCountList.getLastRow(),1).getValues();
          lstStudentNums.sort();

          for (var l = 0; l < lstStudentNums.length; l++) {
            lbxStudentNum.addItem(lstStudentNums[l]);
          }

      var txtSourceGrp = app.createTextBox().setName('txtSourceGrp').setVisible(false);
      var txtTypeGrp = app.createTextBox().setName('txtTypeGrp').setVisible(false);
      var txtElementsID = app.createTextBox().setName('txtElementsID').setText('Elements Test ID').setVisible(false);
      var txtQuiaLink = app.createTextBox().setName('txtQuiaLink').setText('Quia Test Link').setVisible(false);
      var txtQuiaPass = app.createTextBox().setName('txtQuiaPass').setText('Quia Test Passphrase').setVisible(false);

      //Create Source Radio Button Group
      var radHCopy = app.createRadioButton('group1', 'Hard-Copy').setFormValue('Hard-Copy').addClickHandler(app.createClientHandler().forTargets(txtSourceGrp).setText('Hard-Copy'));
      var radECopy = app.createRadioButton('group1', 'Electronic-Copy').setFormValue('Electronic-Copy').addClickHandler(app.createClientHandler().forTargets(txtSourceGrp).setText('Electronic-Copy'));

      //Create Type Radio Button Group
      var radTExam = app.createRadioButton('group2', 'Teacher-Made Exam').setFormValue('Teacher-Made Exam').addClickHandler(app.createClientHandler().forTargets(txtTypeGrp).setText('Teacher-Made Exam'));
      var radEExam = app.createRadioButton('group2', 'Elements Exam').setFormValue('Elements Exam').addClickHandler(app.createClientHandler().forTargets(txtTypeGrp).setText('Elements Exam'));
      var radQExam = app.createRadioButton('group2', 'Quia Exam').setFormValue('Quia Exam').addClickHandler(app.createClientHandler().forTargets(txtTypeGrp).setText('Quia Exam'));

      var btnValidate = app.createButton('Create Event');

      //Client Handlers for textBoxes
      var showTxtElementHandler = app.createClientHandler().forTargets(txtElementsID).setVisible(true);
      var hideTxtElementHandler = app.createClientHandler().forTargets(txtElementsID).setVisible(false);
          radEExam.addClickHandler(showTxtElementHandler);
          radTExam.addClickHandler(hideTxtElementHandler);
          radQExam.addClickHandler(hideTxtElementHandler);


      var showTxtQuiaLinkHandler = app.createClientHandler().forTargets(txtQuiaLink).setVisible(true);
      var hideTxtQuiaLinkHandler = app.createClientHandler().forTargets(txtQuiaLink).setVisible(false);
          radQExam.addClickHandler(showTxtQuiaLinkHandler);
          radTExam.addClickHandler(hideTxtQuiaLinkHandler);
          radEExam.addClickHandler(hideTxtQuiaLinkHandler);

      var showTxtQuiaPassHandler = app.createClientHandler().forTargets(txtQuiaPass).setVisible(true);
      var hideTxtQuiaPassHandler = app.createClientHandler().forTargets(txtQuiaPass).setVisible(false);
          radQExam.addClickHandler(showTxtQuiaPassHandler);
          radTExam.addClickHandler(hideTxtQuiaPassHandler);
          radEExam.addClickHandler(hideTxtQuiaPassHandler);

      //Create validation handler
      var valSubmit = app.createServerClickHandler('valSubmit');
          valSubmit.addCallbackElement(vrtMainPanel);

      //Add this handler to the button
          btnValidate.addClickHandler(valSubmit);

      //Add all the elemnts to the panel 
          var formGrid = app.createGrid(12,3).setCellPadding(3);
          vrtMainPanel.add(formGrid);
          formGrid
          .setWidget(0,0,lbxTeacherName)
          .setWidget(0,1,txtExt)
          .setWidget(0,2,txtTeacherName)
          .setWidget(1,0,lbxPeriod)
          .setWidget(1,1,lbxSubject)
          .setWidget(2,0,lblDate)
          .setWidget(2,1,boxDate)
          .setWidget(3,0,lblStudentNum)
          .setWidget(3,1,lbxStudentNum)
          .setWidget(4,0,radHCopy)
          .setWidget(4,1,radECopy)
          .setWidget(5,0,radTExam)
          .setWidget(6,0,radEExam)
          .setWidget(6,1,txtElementsID)
          .setWidget(7,0,radQExam)
          .setWidget(7,1,txtQuiaLink)
          .setWidget(8,1,txtQuiaPass)
          .setWidget(9,0,txtSourceGrp)
          .setWidget(9,1,txtTypeGrp)
          .setWidget(10,0,btnValidate)

      //Add this panel to the application
      app.add(vrtMainPanel);

      //Return the application
      return app;
}

function valSubmit(e) {
  var flag = 0;
  var app = UiApp.getActiveApplication();

  var Teacher = e.parameter.txtTeacherName;
  var Ext = e.parameter.txtExt;
  var Subject = e.parameter.lbxSubject;
  var Period = e.parameter.lbxPeriod;
  var Date = e.parameter.boxDate;
  var StudentNum = e.parameter.lbxStudentNum;
  var Source = e.parameter.txtSourceGrp;
  var Type = e.parameter.txtTypeGrp;
  var ElementsID = e.parameter.txtElementsID;
  var QuiaLink = e.parameter.txtQuiaLink;
  var QuiaPass = e.parameter.txtQuiaPass;

  if (Teacher == '' || Teacher == '-- Select Teacher --') {
    app.getElementById('vldTeacherName').setText('* Select Teacher').setStyleAttribute("color", "#F00").setVisible(true);
    app.getElementById('lblNoSuccess').setStyleAttribute("color", "#F00").setVisible(true);
    flag = 1;
  }
  if (Ext == '') {
    app.getElementById('vldExt').setText('* Select Teacher Again').setStyleAttribute("color", "#F00").setVisible(true);
    app.getElementById('lblNoSuccess').setStyleAttribute("color", "#F00").setVisible(true);
    flag = 1;
  }
  if (Subject == '' || Subject == '-- Select Subject --') {
    app.getElementById('vldSubject').setText('* Select Subject').setStyleAttribute("color", "#F00").setVisible(true);
    app.getElementById('lblNoSuccess').setStyleAttribute("color", "#F00").setVisible(true);
    flag = 1;
  }
  if (Period == '' || Period == '-- Select Period --') {
    app.getElementById('vldPeriod').setText('* Select Period').setStyleAttribute("color", "#F00").setVisible(true);
    app.getElementById('lblNoSuccess').setStyleAttribute("color", "#F00").setVisible(true);
    flag = 1;
  }
  if (Date == '' || Date == Utilities.formatDate(Date, 'EST', 'yyyy-mm-dd')) {
    app.getElementById('vldDate').setText('* Date must be entered as yyyy-mm-dd').setStyleAttribute("color", "#F00").setVisible(true);
    app.getElementById('lblNoSuccess').setStyleAttribute("color", "#F00").setVisible(true);
    flag = 1;
  }
  if (StudentNum == '' || StudentNum == '-- Select # --') {
    app.getElementById('vldStudentNum').setText('* Select Student #').setStyleAttribute("color", "#F00").setVisible(true);
    app.getElementById('lblNoSuccess').setStyleAttribute("color", "#F00").setVisible(true);
    flag = 1;
  }
  if (Source == '' || Source == false) {
    app.getElementById('vldSourceGrp').setText('* Select either Hard Copy or Electronic Copy').setStyleAttribute("color", "#F00").setVisible(true);
    app.getElementById('lblNoSuccess').setStyleAttribute("color", "#F00").setVisible(true);
    flag = 1;
  }
  if (Type == '' || Type == false) {
    app.getElementById('vldTypeGrp').setText('* Select either Teacher-Made Exam, Elements Exam, or Quia Exam').setStyleAttribute("color", "#F00").setVisible(true);
    app.getElementById('lblNoSuccess').setStyleAttribute("color", "#F00").setVisible(true);
    flag = 1;
  }
  if (ElementsID == '' && Type == 'Elements Exam') {
    app.getElementById('vldElementsID').setText('* Enter Elements ID').setStyleAttribute("color", "#F00").setVisible(true);
    app.getElementById('lblNoSuccess').setStyleAttribute("color", "#F00").setVisible(true);
    flag = 1;
  }
  if (QuiaLink == '' || QuiaPass == '' && Type == 'Quia Exam') {
    app.getElementById('vldQuia').setText('* Enter Quia Link and/or Passphrase').setStyleAttribute("color", "#F00").setVisible(true);
    app.getElementById('lblNoSuccess').setStyleAttribute("color", "#F00").setVisible(true);
    flag = 1;
  }
  if (flag == 0) {
    app.getElementById('lblSuccess').setStyleAttribute("color", "#F00").setVisible(true);

    //Create handler which will execute 'createEvents(e)' on clicking the button
    var evtHandler = app.createServerClickHandler('createEvents');
    var vrtMainPanel = app.getElementById(vrtMainPanel);
        evtHandler.addCallbackElement(vrtMainPanel);
  }
}

function valHandler(e) {
  var app = UiApp.createApplication().setTitle('DHS: Kurzweil Calendar');

  //Create a panel which holds all the form elelemnts
  var vrtMainPanel = app.createVerticalPanel().setId('vrtMainPanel');

  var lblSuccess = app.createLabel('Check your information below, if everything looks correct you may confirm your event...').setName('lblSuccess').setId('lblSuccess').setVisible(false);
  var lblNoSuccess = app.createLabel('There were issues with the creation of your event... click BACK, and make the following corrections:').setName('lblNoSuccess').setId('lblNoSuccess').setVisible(false);
  var vldTeacherName = app.createLabel().setId('vldTeacherName').setVisible(false);
  var vldExt = app.createLabel().setId('vldExt').setVisible(false);
  var vldDate = app.createLabel().setId('vldDate').setVisible(false);
  var vldSubject = app.createLabel().setId('vldSubject').setVisible(false);
  var vldPeriod = app.createLabel().setId('vldPeriod').setVisible(false);
  var vldStudentNum = app.createLabel().setId('vldStudentNum').setVisible(false);
  var vldSourceGrp = app.createLabel().setId('vldSourceGrp').setVisible(false);
  var vldTypeGrp = app.createLabel().setId('vldTypeGrp').setVisible(false);
  var vldElementsID = app.createLabel().setId('vldElementsID').setVisible(false);
  var vldQuia = app.createLabel().setId('vldQuia').setVisible(false);

  var btnCreate = app.createButton('Corfirm Event');

  //Add this handler to the button
  var evtHandler = app.getElementById('evtHandler');
  btnCreate.addClickHandler(evtHandler);

  //Add all the elemnts to the panel 
          var formGrid = app.createGrid(13,3).setCellPadding(3);
          vrtMainPanel.add(formGrid);
          formGrid
          .setWidget(0,0,lblSuccess)
          .setWidget(1,0,lblNoSuccess)
          .setWidget(2,0,vldTeacherName)
          .setWidget(3,0,vldExt)
          .setWidget(4,0,vldDate)
          .setWidget(5,0,vldSubject)
          .setWidget(6,0,vldPeriod)
          .setWidget(7,0,vldStudentNum)
          .setWidget(8,0,vldSourceGrp)
          .setWidget(9,0,vldTypeGrp)
          .setWidget(10,0,vldElementsID)
          .setWidget(11,0,vldQuia)
          .setWidget(12,0,btnCreate)

  //Add this panel to the application
      app.add(vrtMainPanel);

      //Return the application
      return app;
}