Re: [Pythoncard-users] dialog form processing

[Alex T. <al...@tw...>]

Alex Tweedly wrote:

> Bryan Murdock wrote:
>
>> I'm writing an app that will open up a CustomDialog asking the user to
>> fill in a number of TextFields.  I'm trying to figure out a good
>> design for validating the fields and prompting the user to try again
>> if they left one blank, or entered something invalid.  It looks to me
>> like it can only be done after the user clicks OK and I get the result
>> back.  I'm having my Background create an alert dialog telling the
>> user what they did wrong, and then go back and redisplay the dialog,
>> which is kind OK, I guess.  Any suggestions for improvement?
>
> You can do it in the custom dialog function. This simple example will 
> keep the dialog on-screen until it gets a satisfactory value for one 
> of the fields (or the "Cancel" button is clicked).


which is true - but there's a better (and more obvious !!) way .... put 
in your own handler for the OK button within the dialog, validate any 
fields there - if they're good, do an event.skip(), if they're bad, pop 
up an alert (or whatever else you want) to inform the user ...

from PythonCard import model, dialog

class MyDialog(model.CustomDialog):
    def __init__(self, parent, txt=''):
        model.CustomDialog.__init__(self, parent)
       
    def on_btnOK_mouseClick(self, event):
        if self.components.TextField1.text == "Done":
            event.skip()
        else:
            result = dialog.alertDialog(self, 'Field 1 must be "Done"', 
'title')
       

def myDialog(parent):
    dlg = MyDialog(parent)
    result = dlg.showModal()

##    result.TextField1 = dlg.components.TextField1.text
##    result.TextField2 = dlg.components.TextField2.text
    result.texts = {}
    for name in ["TextField1", "TextField2"]:
        result.texts[name] = dlg.components[name].text
    dlg.destroy()
    return result


-- 
Alex Tweedly       http://www.tweedly.net



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