var dtCh = "/";
var minYear = 1900;
var maxYear = 2100;


function checkInput(form) {
    if (isDouble(form.m_acquistateprec.value) && isDouble(form.m_acquistate.value) && isDouble(form.m_contracquistato.value) && isDouble(form.m_azioniprog.value) && isDouble(form.m_totazioni.value) && isDouble(form.m_resacquistabile.value) && isDouble(form.m_resvalore.value) && isDouble(form.m_controvaloremax.value) && isDate(form.m_datadelibera.value) && isDouble(form.m_valoremedio.value) && isDouble(form.m_percproprieta.value) && isDouble(form.m_percproprietabw.value) && isDouble(form.m_totcontrollo.value))
        return true;
    else {
        document.getElementById("_message").innerHTML = '';
        return false;
    }
}


function isDouble(val) {
        var validChars = '0123456789,';

        for (var i = 0; i < val.length; i++) {
            if (validChars.indexOf(val.charAt(i)) == -1) {
                alert('Inserire un decimale valido separato dalla virgola');
                return false;
            }
        }

        return true;
}



function isInteger(s) {
    var i;
    for (i = 0; i < s.length; i++) {
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag) {
    var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++) {
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary(year) {
    // February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ((!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28);
}

function DaysArray(n) {
    for (var i = 1; i <= n; i++) {
        this[i] = 31
        if (i == 4 || i == 6 || i == 9 || i == 11) { this[i] = 30 }
        if (i == 2) { this[i] = 29 }
    }
    return this
}

function isDate(dtStr) {
    var daysInMonth = DaysArray(12);    
    var pos1 = dtStr.indexOf(dtCh);
    var pos2 = dtStr.indexOf(dtCh, pos1 + 1);
    var strMonth = dtStr.substring(pos1 + 1, pos2);
    var strDay = dtStr.substring(0, pos1);
    var strYear = dtStr.substring(pos2 + 1);
    strYr = strYear;
    if (strDay.charAt(0) == "0" && strDay.length > 1) strDay = strDay.substring(1);
    if (strMonth.charAt(0) == "0" && strMonth.length > 1) strMonth = strMonth.substring(1);
    for (var i = 1; i <= 3; i++) {
        if (strYr.charAt(0) == "0" && strYr.length > 1) strYr = strYr.substring(1);
    }
    month = parseInt(strMonth);
    day = parseInt(strDay);
    year = parseInt(strYr);
    if (pos1 == -1 || pos2 == -1) {
        alert("Il formato della data deve essere : dd/mm/yyyy");
        return false;
    }
    if (strMonth.length < 1 || month < 1 || month > 12) {
        alert("Inserire un mese valido");
        return false;
    }
    if (strDay.length < 1 || day < 1 || day > 31 || (month == 2 && day > daysInFebruary(year)) || day > daysInMonth[month]) {
        alert("Inserire un giorno valido");
        return false;
    }
    if (strYear.length != 4 || year == 0 || year < minYear || year > maxYear) {
        alert("Inserire un anno di 4 cifre tra " + minYear + " e " + maxYear);
        return false;
    }
    if (dtStr.indexOf(dtCh, pos2 + 1) != -1 || isInteger(stripCharsInBag(dtStr, dtCh)) == false) {
        alert("Inserire una data valida");
        return false;
    }
    return true;
}

function ValidateForm() {
    var dt = document.frmSample.txtDate
    if (isDate(dt.value) == false) {
        dt.focus()
        return false
    }
    return true
}