from pyjamas.ui.RootPanel import RootPanel
from pyjamas.ui.TextArea import TextArea
from pyjamas.ui.Label import Label
from pyjamas.ui.Button import Button
from pyjamas.ui.HTML import HTML
from pyjamas.ui.VerticalPanel import VerticalPanel
from pyjamas.ui.HorizontalPanel import HorizontalPanel
from pyjamas.ui.ListBox import ListBox
from pyjamas.ui.FormPanel import FormPanel
from pyjamas.ui.FileUpload import FileUpload
from pyjamas.ui.TextBox import TextBox
from pyjamas import Window

class FormPanelExample:
    def onModuleLoad(self):
        # Create a FormPanel and point it at a service.
        self.form = FormPanel()
        self.form.setAction("/chat-service/test/")

        # Because we're going to add a FileUpload widget, we'll need to set the
        # form to use the POST method, and multipart MIME encoding.
        self.form.setEncoding(FormPanel.ENCODING_MULTIPART)
        self.form.setMethod(FormPanel.METHOD_POST)

        # Create a panel to hold all of the form widgets.
        panel = VerticalPanel()
        self.form.setWidget(panel)

        # Create a TextBox, giving it a name so that it will be submitted.
        self.tb = TextBox()
        self.tb.setName("textBoxFormElement")
        panel.add(self.tb)

        # Create a ListBox, giving it a name and some values to be associated with
        # its options.
        lb = ListBox()
        lb.setName("listBoxFormElement")
        lb.addItem("foo", "fooValue")
        lb.addItem("bar", "barValue")
        lb.addItem("baz", "bazValue")
        panel.add(lb)

        # Create a FileUpload widget.
        upload = FileUpload()
        upload.setName("uploadFormElement")
        panel.add(upload)

        # Add a 'submit' button.
        panel.add(Button("Submit", self))

        # Add an event handler to the form.
        self.form.addFormHandler(self)

        RootPanel().add(self.form)

    def onClick(self, sender):
        self.form.submit()

    def onSubmitComplete(self, event):
        # When the form submission is successfully completed, this event is
        # fired. Assuming the service returned a response of type text/plain,
        # we can get the result text here (see the FormPanel documentation for
        # further explanation).
        Window.alert(event.getResults())

    def onSubmit(self, event):
        # This event is fired just before the form is submitted. We can take
        # this opportunity to perform validation.
        if (self.tb.getText().length == 0):
            Window.alert("The text box must not be empty")
            event.setCancelled(true)



if __name__ == '__main__':
    app = FormPanelExample()
    app.onModuleLoad()
