常用javascript函数-JAVA91知识库

常用javascript函数

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/*********************************************************************************
*    FUNCTION:        isBetween
*    PARAMETERS:        val        AS any value
*                    lo        AS Lower limit to check
*                    hi        AS Higher limit to check
*    CALLS:            NOTHING
*    RETURNS:        TRUE if val is between lo and hi both inclusive, otherwise false.
**********************************************************************************/
function isBetween(val, lo, hi) {
    if ((val < lo) || (val > hi)) {
        return (false);
    } else {
        return (true);
    }
}

/*********************************************************************************
*    FUNCTION:        isDate checks a valid date
*    PARAMETERS:        theStr        AS String
*    CALLS:            isBetween, isInt
*    RETURNS:        TRUE if theStr is a valid date otherwise false.
**********************************************************************************/
function isDate(theStr) {
    var the1st = theStr.indexOf('-');
    var the2nd = theStr.lastIndexOf('-');

if (the1st == the2nd) {
        return (false);
    } else {
        var y = theStr.substring(0, the1st);
        var m = theStr.substring(the1st + 1, the2nd);
        var d = theStr.substring(the2nd + 1, theStr.length);
        var maxDays = 31;

if (isInt(m) == false || isInt(d) == false || isInt(y) == false) {
            return (false);
        } else if (y.length < 4) {
            return (false);
        } else if (!isBetween(m, 1, 12)) {
            return (false);
        } else if (m == 4 || m == 6 || m == 9 || m == 11) maxDays = 30;
        else if (m == 2) {
            if (y % 4 > 0) maxDays = 28;
            else if (y % 100 == 0 && y % 400 > 0) maxDays = 28;
            else maxDays = 29;
        }
        if (isBetween(d, 1, maxDays) == false) {
            return (false);
        } else {
            return (true);
        }
    }
}
/*********************************************************************************
*    FUNCTION:        isEuDate checks a valid date in British format
*    PARAMETERS:        theStr        AS String
*    CALLS:            isBetween, isInt
*    RETURNS:        TRUE if theStr is a valid date otherwise false.
**********************************************************************************/
function isEuDate(theStr) {
    if (isBetween(theStr.length, 8, 10) == false) {
        return (false);
    } else {
        var the1st = theStr.indexOf('/');
        var the2nd = theStr.lastIndexOf('/');

if (the1st == the2nd) {
            return (false);
        } else {
            var m = theStr.substring(the1st + 1, the2nd);
            var d = theStr.substring(0, the1st);
            var y = theStr.substring(the2nd + 1, theStr.length);
            var maxDays = 31;

if (isInt(m) == false || isInt(d) == false || isInt(y) == false) {
                return (false);
            } else if (y.length < 4) {
                return (false);
            } else if (isBetween(m, 1, 12) == false) {
                return (false);
            } else if (m == 4 || m == 6 || m == 9 || m == 11) maxDays = 30;
            else if (m == 2) {
                if (y % 4 > 0) maxDays = 28;
                else if (y % 100 == 0 && y % 400 > 0) maxDays = 28;
                else maxDays = 29;
            }

if (isBetween(d, 1, maxDays) == false) {
                return (false);
            } else {
                return (true);
            }
        }
    }

}
/********************************************************************************
*   FUNCTION:       Compare Date! Which is the latest!
*   PARAMETERS:     lessDate,moreDate AS String
*   CALLS:          isDate,isBetween
*   RETURNS:        TRUE if lessDate<moreDate
*********************************************************************************/
function isComdate(lessDate, moreDate) {
    if (!isDate(lessDate)) {
        return (false);
    }
    if (!isDate(moreDate)) {
        return (false);
    }
    var less1st = lessDate.indexOf('-');
    var less2nd = lessDate.lastIndexOf('-');
    var more1st = moreDate.indexOf('-');
    var more2nd = moreDate.lastIndexOf('-');
    var lessy = lessDate.substring(0, less1st);
    var lessm = lessDate.substring(less1st + 1, less2nd);
    var lessd = lessDate.substring(less2nd + 1, lessDate.length);
    var morey = moreDate.substring(0, more1st);
    var morem = moreDate.substring(more1st + 1, more2nd);
    var mored = moreDate.substring(more2nd + 1, moreDate.length);
    var Date1 = new Date(lessy, lessm, lessd);
    var Date2 = new Date(morey, morem, mored);
    if (Date1 > Date2) {
        return (false);
    }
    return (true);

}

/*********************************************************************************
*    FUNCTION    isEmpty checks if the parameter is empty or null
*    PARAMETER    str        AS String
**********************************************************************************/
function isEmpty(str) {
    if ((str == null) || (str.length == 0)) return true;
    else return (false);
}

/*********************************************************************************
*    FUNCTION:        isInt
*    PARAMETER:        theStr    AS String 
*    RETURNS:        TRUE if the passed parameter is an integer, otherwise FALSE
*    CALLS:            isDigit
**********************************************************************************/
function isInt(theStr) {
    var flag = true;

if (isEmpty(theStr)) {
        flag = false;
    } else {
        for (var i = 0; i < theStr.length; i++) {
            if (isDigit(theStr.substring(i, i + 1)) == false) {
                flag = false;
                break;
            }
        }
    }
    return (flag);
}

/*********************************************************************************
*    FUNCTION:        isReal
*    PARAMETER:    heStr    AS String 
                        decLen    AS Integer (how many digits after period)
*    RETURNS:        TRUE if theStr is a float, otherwise FALSE
*    CALLS:            isInt
**********************************************************************************/
function isReal(theStr, decLen) {
    var dot1st = theStr.indexOf('.');
    var dot2nd = theStr.lastIndexOf('.');
    var OK = true;

if (isEmpty(theStr)) return false;

if (dot1st == -1) {
        if (!isInt(theStr)) return (false);
        else return (true);
    }

else if (dot1st != dot2nd) return (false);
    else if (dot1st == 0) return (false);
    else {
        var intPart = theStr.substring(0, dot1st);
        var decPart = theStr.substring(dot2nd + 1);

if (decPart.length > decLen) return (false);
        else if (!isInt(intPart) || !isInt(decPart)) return (false);
        else if (isEmpty(decPart)) return (false);
        else return (true);
    }
}

/*********************************************************************************
*    FUNCTION:        isEmail
*    PARAMETER:        String (Email Address)
*    RETURNS:        TRUE if the String is a valid Email address
*                    FALSE if the passed string is not a valid Email Address
*    EMAIL FORMAT:    AnyName@EmailServer e.g; webmaster@hotmail.com
*                    @ sign can appear only once in the email address.
*********************************************************************************/
function isEmail(theStr) {
    var atIndex = theStr.indexOf('@');
    var dotIndex = theStr.indexOf('.', atIndex);
    var flag = true;
    theSub = theStr.substring(0, dotIndex + 1)

if ((atIndex < 1) || (atIndex != theStr.lastIndexOf('@')) || (dotIndex < atIndex + 2) || (theStr.length <= theSub.length)) {
        return (false);
    } else {
        return (true);
    }
}
/*********************************************************************************
*    FUNCTION:        newWindow
*    PARAMETERS:        doc         ->    Document to open in the new window
                    hite     ->    Height of the new window
                    wide     ->    Width of the new window
                    bars    ->    1-Scroll bars = YES 0-Scroll Bars = NO
                    resize     ->    1-Resizable = YES 0-Resizable = NO
*    CALLS:            NONE
*    RETURNS:        New window instance
**********************************************************************************/
function newWindow(doc, hite, wide, bars, resize) {
    var winNew = "_blank";
    var opt = "toolbar=0,location=0,directories=0,status=0,menubar=0,";
    opt += ("scrollbars=" + bars + ",");
    opt += ("resizable=" + resize + ",");
    opt += ("width=" + wide + ",");
    opt += ("height=" + hite);
    winHandle = window.open(doc, winNew, opt);
    return;
}
/*********************************************************************************
*    FUNCTION:        DecimalFormat
*    PARAMETERS:        paramValue -> Field value
*    CALLS:                NONE
*    RETURNS:        Formated string
**********************************************************************************/
function DecimalFormat(paramValue) {
    var intPart = parseInt(paramValue);
    var decPart = parseFloat(paramValue) - intPart;

str = "";
    if ((decPart == 0) || (decPart == null)) str += (intPart + ".00");
    else str += (intPart + decPart);

return (str);
}