Some useful js methods

/**

 * remove url from browser address bar without page refresh / works only with html5 enabled browser it seems
 */
    var uri = window.location.toString();

    if (uri.indexOf("?") > 0) {

        var clean_uri = uri.substring(0, uri.indexOf("?"));

        window.history.replaceState({}, document.title, clean_uri);

    }

/**

 * To convert utc to est

 */

function convertUTCtoEST(utcDate) {

var offsetValue = 5;

       var dateTime ="";

       try{

              if(utcDate != undefined && utcDate != null && Trim(utcDate).length > 0){

                     var estDate = new Date(utcDate);

                     estDate.setHours(estDate.getHours() - offsetValue);

                     //formatting date time

                     dateTime = appendZero(estDate.getMonth() + 1) + "/" + appendZero(estDate.getDate()) + "/"

                                  + estDate.getFullYear() + " " + appendZero(estDate.getHours()) + ":"

                                  + appendZero(estDate.getMinutes());

              }

              else{

                     dateTime ="";

              }

       }

       catch(err){

       }

       return utcDate;

}

Convert string to date

//function to split

function ConvertToDate(dateValue) {

    var dateValueDetail = dateValue.split('-');

    var dateYear = dateValueDetail[0];

    var dateMonth = dateValueDetail[1];

    var dateDay = dateValueDetail[2];

    return new Date(dateYear, dateMonth - 1, dateDay);

}

Calculate difference b/w months

 //function to find number of months in between

function monthDiff(d1, d2) {

    var months;

    months = (d2.getFullYear() - d1.getFullYear()) * 12;

    months -= d1.getMonth() + 1;

    months += d2.getMonth();

    //till now months will have only the number of months in between start date and end date

    var diff = d1.getMonth() - d2.getMonth();

    if (diff > 2 || diff < -2) {

        months += 2;

    }

    return months;

}

Get/Set cookie

 //function to set cookie

function setCookie(c_name, value) {

    var c_value = escape(value);

    document.cookie = c_name + "=" + c_value + "; path=/";

}

//function to get cookie

function getCookie(c_name) {

    var i, x, y, ARRcookies = document.cookie.split(";");

    for (i = 0; i < ARRcookies.length; i++) {

        x = ARRcookies[i].substr(0, ARRcookies[i].indexOf("="));

        y = ARRcookies[i].substr(ARRcookies[i].indexOf("=") + 1);

        x = x.replace(/^\s+|\s+$/g, "");

        if (x == c_name) {

            return unescape(y);

        }

    }

}

Function to read query string

function readQueryString() {

    var qrStr = window.location.search;

    var spQrStr = qrStr.substring(1);

    var arrQrStr = new Array();

    var arr = spQrStr.split('&');

    var queryValue = null;

    for (var i = 0; i < arr.length; i++) {

        var queryvalue = arr[i].split('=');

        if (queryvalue[0] == "ID") { // ID - Query string key

            queryValue = queryvalue[1].replace("%20", " ").toLowerCase();

        }

    }

    if (queryValue != null && queryValue != "") {

        return queryValue;

    }

}

Manual triming of white spaces

function Trim(str, intialValue, lastValue) {

    while (str.substring(0, 1) == ' ') // check for white spaces from beginning

    {

        str = str.substring(1, str.length);

    }

    while (str.substring(str.length - 1, str.length) == ' ') // check white space from end

    {

        str = str.substring(0, str.length - 1);

    }

    if (str == intialValue || str == lastValue) {

        return "";

    }

    else {

        return str;

    }

}