Can't access to event posted values - post

Question

i'm writing a little google apps script which allow to select several names among a list of developpers. But in my doPost(e) method, i can't access to the array of posted values (it's undefinded), event if i check all the checkboxes...
function onOpen() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
// add the new menu
var menuEntries = [];
menuEntries.push({name: "Edit page", functionName: "start"})
ss.addMenu("My tools", menuEntries);
}
function start() {
var app = UiApp.createApplication();
app.setTitle("Edit page");
var formPanel = app.createFormPanel();
var mainPanel = app.createVerticalPanel();
var gridPanel = app.createGrid(1, 2);
// developpers
var developperPanel = app.createVerticalPanel()
var developpers = [];
developpers.push( "John", "Peter", "Max", "Johnny" );
for (var i = 1; i < developpers.length; ++i) {
var checkbox = app.createCheckBox(developpers[i]).setName("dev"+i);
developperPanel.add(checkbox);
}
gridPanel.setWidget(0,0,app.createLabel("Developpers : "));
gridPanel.setWidget(0,1,developperPanel);
// submit button
mainPanel.add(gridPanel);
mainPanel.add(app.createSubmitButton().setText("OK"));
formPanel.add(mainPanel);
app.add(formPanel);
var ss = SpreadsheetApp.getActive();
ss.show(app);
}
function doPost(e) {
var app = UiApp.getActiveApplication();
app.add(app.createLabel(e.values[0])); // Here is the error.
return app;
}
In the exemple, the list is fixed but in my real script, i create the list thanks to the Spreadsheet.
Thanks
Max

Answer 1

The correct way to see the checkboxes values is using e.parameter[name], like you said yourself on a comment. Here is some code example:
function start() {
//...
var developpers = ["John", "Peter", "Max", "Johnny"];
//you were skiping the first developer
for (var i = 0; i < developpers.length; ++i) { //array starts on zero, not one
var checkbox = app.createCheckBox(developpers[i]).setName("dev"+i);
developperPanel.add(checkbox);
}
//...
}
function doPost(e) {
var app = UiApp.getActiveApplication();
var developpers = ["John", "Peter", "Max", "Johnny"]; //repeat it here or make it global, if it's static like this
var checked = [];
for( var i in developpers )
if( e.parameter['dev'+i] == 'true' )
checked.push(developpers[i]);
app.add(app.createLabel(checked));
return app;
}

Answer 2

You should use e.parameter.yourCheckBoxName
for example:
function doPost(e) {
var app = UiApp.getActiveApplication();
app.add(app.createLabel(e.parameter.dev1); // Access checkbox by its name
return app;
}
This would show status of check box "Peter", when it is checked. You can modify based on your need.