numericinput.py

# This widget requires jQuery-iMask to run
#https://github.com/cwolves/jQuery-iMask

def numeric_widget_factory():
    import locale, string, random
    from gluon.sqlhtml import StringWidget
    from gluon import current
    from gluon.http import HTTP
    
    T = current.T
    locale.setlocale(locale.LC_ALL, '')
    loc = locale.localeconv()
    
    DECIMAL_PLACES = loc.get('frac_digits', None) or 2
    DECIMAL_SEPARATOR = loc.get('decimal_point', None) or '.'
    THOUSAND_PLACES = loc.get('grouping', [3,0])[0]
    THOUSAND_SEPARATOR = loc.get('thousands_sep', None) or ','
    
    lib = URL(c='static', f='js/jquery-imask.js');
    basescripts = ["""
    ;/* Plugin jQuery para o agendamento da execucao de uma determinada acao
    no instante em que o objeto passar a existir */
    $.fn.onAvailable = function(fn){
        var self = this, sel = this.selector, timer;
        if (this.length > 0) {
            fn.call(this);
        } else {
            timer = setInterval(function(){
                if ($(sel).length > 0) {
                    fn.call(self);
                    clearInterval(timer);
                }
            }, 50);
        }
    };""",
    """
    ;function maskNumberThis(uid){
        $('input[uid="' + uid + '"]').onAvailable(function(){
            var element = $('input[uid="' + uid + '"]');
            if (!element.data('masked')){
                element.iMask({
                    'type': 'number', 
                    'decDigits': parseFloat(element.data('decimal_places')),
                    'groupSymbol': element.data('thousand_separator'),
                    'decSymbol': element.data('decimal_separator'),
                    'groupDigits': parseFloat(element.data('thousand_places'))
                });
            }
        });
    };
    """
    ]
    if not lib in response.files:
        response.files.append(lib)
        
    response.js = (response.js or '')
    for basescript in basescripts:
        if not basescript in response.js:
            response.js += basescript.strip()
        
    # Cria uma string randomica - útil para identificadores
    UID = lambda length=8: ''.join([random.choice(string.ascii_letters+string.digits) for x in range(length)])
    
    class NumericWidget(StringWidget):
        _class = 'number'
        @classmethod
        def widget(cls, field, value, **attributes):            
            
            #remove todos os caracters que não compõem um decimal
            fin = lambda data: str(data).replace(THOUSAND_SEPARATOR, '').replace(DECIMAL_SEPARATOR, '.').strip() or '0.00' if data else None
            
            if request.vars:
                if request.vars[field.name]:
                    request.vars[field.name] = fin(request.vars[field.name])
            uid = UID()
            
            defaults = {
                '_data-DECIMAL_PLACES': DECIMAL_PLACES,
                '_data-DECIMAL_SEPARATOR': DECIMAL_SEPARATOR,
                '_data-THOUSAND_PLACES': THOUSAND_PLACES,
                '_data-THOUSAND_SEPARATOR': THOUSAND_SEPARATOR,
                '_uid': uid,
            }
            
            attr = cls._attributes(field, defaults, **attributes)
            
            script = ";maskNumberThis(%s);"%`uid`
            if not script in response.js:
                response.js += script
                
            return StringWidget.widget(field, fin(value), **attr)
        
    return NumericWidget.widget