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[REBOL] Re: Input validation routines

From: didier:cadieu:freesbee at: 27-Aug-2003 23:01

Re: Input validation routines
> Hi, has someone written a set of input validation routines/dialect, > where I can check data against some format specification? Those things > one knows from Excel, databases etc. for dates, number, strings, length > of input and so on. Thanks. Robert
Hi all I have made a custom field style to convert on the fly user input to another datatype. This face also filter the key allowed to be entered in the field. So the user can't input any forbidden char. For exemple, to input an integer value by allowing only digit and minus, the layout spec will be : view layout [ style field-style filter-field convert-to integer! filter "-0123456789" ] 'convert-to and 'filter are specifics to this style and optional of course. 'convert-to can be follow by the desire datatype or by a function that take the face for parameters and must return the result of the conversion. the result is stored in the property "value" of the object and is set to none! if the conversion failed. By default, "value" is a copy of "text" 'filter can be follow by a string!, a block of char/string (like 'charset function one) or a bitset!. In all case this value represent the char that can be typed by the user. If the key pressed is not in this spec, the input value is discard and doesn't appear in the field. You can find this style and a test script here : or on my rebsite : (REM: click "filter-field-style" to put it in the cache before trying the demo) Doc and more examples are in the header of filter-field-style.r Hope it can help you Didec