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inputs = event.detail.inputs;
inputs.forEach( function(el) {
    if ( el.name == 'doacao ' ) {
    	if ( el.value == 'Única' ) {
    		location.href = 'http://yoursite.com/';
    	} else if ( el.value == 'Recorrente' ) {
    		location.href = 'http://yoursite.com/about/';
    	}
    }
});

[select* doacao include_blank "Única" "Recorrente"]