Cannot read property "parameter" from undefined error with Logger.log - google-apps-script

Question

I am getting "TypeError: Cannot read property "parameter" from undefined." when trying to log e.parameter properties. (I inserted the following lines in the contactMe() function)
Logger.log(e.parameter.textBox);
Logger.log(e.parameter);
The script otherwise works fine, any idea?
function doGet() {
var app = UiApp.createApplication();
var mainPanel = app.createVerticalPanel().setId('mainPanel');
app.add(mainPanel);
mainPanel.add(app.createLabel('Enter your email to sign up'));
var form = app.createHorizontalPanel();
mainPanel.add(form);
var email = app.createTextBox().setName('textBox').setId('textBox');
form.add(email);
var button = app.createButton('Sign up');
form.add(button);
var info = app.createLabel().setVisible(true).setId('info');
mainPanel.add(info);
//handler
var handler = app.createServerHandler('contactMe').addCallbackElement(mainPanel);
button.addClickHandler(handler);
return app;
}
function contactMe(e){
var app = UiApp.getActiveApplication();
Logger.log("testing");
Logger.log(e.parameter);
Logger.log(e.parameter.textBox);
app.getElementById('textBox').setValue('').setStyleAttribute("color", "black");
app.getElementById('info').setText('Thank you!').setStyleAttribute("color", "black");
var ss = SpreadsheetApp.openById('0AqKSxC6f0Cc7dF9aT1lUeXFEcnR2eUFYRGs4Y1NiVVE')
.getSheets()[0];
var range = ss.getRange(ss.getLastRow()+1, 1, 1, 2);
var values = [[new Date(),e.parameter.textBox]];
range.setValues(values);
return app;
}

Answer 1

I just tested your exact code (except the sheet stuff) and it works nicely... except that the logger doesn't show anything when called from a handler function but that's a known issue...
I used the label to check the e.parameter value like this :
app.getElementById('info').setText(e.parameter.textBox).setStyleAttribute("color", "black");

Answer 2

A bit out of the box but i think it should work:
function doGet() {
var app = UiApp.createApplication();
var mainPanel = app.createFormPanel;
app.add(mainPanel);
mainPanel.add(app.createLabel('Enter your email to sign up'));
var form = app.createHorizontalPanel();
mainPanel.add(form);
var email = app.createTextBox().setName('textBox').setId('textBox');
form.add(email);
var button = app.createSubmitButton('Sign up');
form.add(button);
var info = app.createLabel().setVisible(true).setId('info');
mainPanel.add(info);
return app;
}
function doPost(e){
var app = UiApp.getActiveApplication();
//Logger wont work in uiApps
//in Form panels the UI is cleared so you want to write a thank you note
app.add(app.createLabel("Thanks"));
var ss = SpreadsheetApp.openById('0AqKSxC6f0Cc7dF9aT1lUeXFEcnR2eUFYRGs4Y1NiVVE')
.getSheets()[0];
var range = ss.getRange(ss.getLastRow()+1, 1, 1, 2);
var values = [[new Date(),e.parameter.textBox]];
range.setValues(values);
return app;
With kind regards,
Thomas van Latum

Answer 3

I just copy pasted your complete code made a spreadsheet and ran it.
It works just perfectly dont forget your } at the end.....