Jquery ui datepicker appears off screen fix

/*e.g. $('.ui-datepicker').center();*/

jQuery.fn.center = function () {
    this.css("position", "absolute");
    this.css("top", (($(window).height() - this.outerHeight()) / 2) + $(window).scrollTop() + "px");
    this.css("left", (($(window).width() - this.outerWidth()) / 2) + $(window).scrollLeft() + "px");
    return this;
}

Restricting keyboard input with jQuery and validate decimal precision,scale

keycodechecker Demo
txt.Attributes.Add("class", "numbersonly");

In blur or textbox leaving, or in button click call the below function

function IsDecimal(Salary) {
     var _Salary = $('#' + Salary);
     if (!_Salary.isValidScale(6, 2)) {
         _Salary.focus();
         alert('Invalid decimal points');
         return false;
     }
     return true;
 }

/*Numeric validation starts*/

//Allows decimal places with only one .(decimal point or full stop)
$(".numbersonly").keydown(function (event) {
    // Prevent shift key since its not needed
    if (event.shiftKey == true) {
        event.preventDefault();
    }

    // Allow Only: keyboard 0-9, numpad 0-9
    if ((event.keyCode >= 48 && event.keyCode <= 57) || (event.keyCode >= 96 && event.keyCode <= 105)
        //Allow Only: backspace, tab, left arrow, right arrow
        || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 37 || event.keyCode == 39
        //Allow Only: delete, home, end
        || event.keyCode == 46 || event.keyCode == 36 || event.keyCode == 35
        //Allow Only: .(full stop [keyboar, numpad]) and check if there is more than one .(full stop)
        || ((event.keyCode == 190 || event.keyCode == 110) && $(this).val().indexOf('.') < 0)
    ) {
        // Allow normal operation
    } else {
        // Prevent the rest
        event.preventDefault();
    }
});

//Validate the count of precision and scale of a decimal value
//ctrlID.isValidScale(6,2);
jQuery.fn.isValidScale = function (precision, scale) {
    //return !Number.isNaN(num) && parseFloat(num).toFixed(scale).toString() === this.val();
    /*          debugger;
         var ina = !isNaN(num);
         var len = decimalPlaces(num)
         var isTrue = decimalPlaces(num) <= parseInt(scale)
         var tr = !isNaN(num) && isTrue;*/

    var num = parseFloat(this.val()) || 0;
    var intPart = parseInt(this.val()).toString(); //Convert to string

    //if input control is empty
    if (num.length == 0) return true;
    if (intPart.length > parseInt(precision)) return false;

    return !isNaN(num) && decimalPlaces(num) <= parseInt(scale);
};

function decimalPlaces(n) {
    var a;
    var len = (a = (n.toString().charAt(0) == '-' ? n - 1 : n + 1).toString().replace(/^-?[0-9]+\.?([0-9]+)$/, '$1').length) >= 1 ? a : 0;
    return parseInt(len);
}

$(".intonly").keydown(function (event) {
    // Prevent shift key since its not needed
    if (event.shiftKey == true) {
        event.preventDefault();
    }
    // Allow Only: keyboard 0-9, numpad 0-9, backspace, tab, left arrow, right arrow, delete, home, end
    if ((event.keyCode >= 48 && event.keyCode <= 57) || (event.keyCode >= 96 && event.keyCode <= 105) || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 37 || event.keyCode == 39 || event.keyCode == 46 || event.keyCode == 36 || event.keyCode == 35) {
        // Allow normal operation
    } else {
        // Prevent the rest
        event.preventDefault();
    }
});

var isValidCurrency = function (input) {
    var num = parseFloat(input);
    return !Number.isNaN(num) && parseFloat(num).toFixed(2).toString() === input;
};
/*Numeric validation ends*/

How to get the value of checkboxlist in jquery

For the checboxlist create an attribute for each listitem
/*to get the checkbox value in jquery*/
foreach (ListItem li in cbHideColumns.Items)
{
li.Attributes.Add("someValue", li.Value);
}
How to get the value in jquery
$(".cbShowOrHideGvCols input[type=checkbox]").each(function () {
var checkbox = $(this)
if ($(ctrl).is(":checked")) {
var val = checkbox.parent().attr('someValue');
}
});

jquery - Datatables change language dynamically

1. Consider we need both chinese and english
2. Create 2 text files jquery.dataTables.en-US.txt, jquery.dataTables.zh-CN.txt
3. Go to the url http://datatables.net/plug-ins/i18n
Get the language text and paste it in the relative files.
4. In the masterpage we need to have a hidden control.

5. Store the current language in the hidden field.

hdnLang.Value = SessionProxy.Search.Language.ToLower();

6. Get the language in the javascript file

var locale = ($('#ctl00_hdnLang').val() || "en-us");

7. Dynamically change the datatable language file

var langFile = "../Scripts/jquery.dataTables.en-US.txt";
if (locale === "zh-cn") {
langFile = "../Scripts/jquery.dataTables.zh-CN.txt";
}

8. Using it in the script

var oTable = $('.gvDataTable').dataTable({
    "oLanguage": {
        "sUrl": langFile
    },
    "sScrollX": "99%",
    "bStateSave": true, //http://datatables.net/forums/discussion/573/how-to-stay-on-current-page-after-re-draw/p1
    "fnDrawCallback": function (oSettings) {/*Re-Create serial no for the table*/
        /* Need to redo the counters if filtered or sorted */
        if (oSettings.bSorted || oSettings.bFiltered) {
            for (var i = 0, iLen = oSettings.aiDisplay.length; i < iLen; i++) {
                $('td:eq(0)', oSettings.aoData[oSettings.aiDisplay[i]].nTr).html(i + 1);
            }
        }
         /*Put checkboxlist after filter to show/hide columns after excel export*/
        $('.cbShowOrHideGvCols').appendTo('div.DTTT_container'); 
    },
    /*"sDom": 'r<"H"lf><"datatable-scroll"t><"F"ip>',*/
    "sDom": '<"H"lTfr><"datatable-scroll"t><"F"ip>',
    "oTableTools": {
        "sSwfPath": "../Scripts/media/swf/copy_csv_xls_pdf.swf",
        /*"sSwfPath": "http://datatables.net/release-datatables/extras/TableTools/media/swf/copy_csv_xls_pdf.swf",*/
        "aButtons": [{ /*http://datatables.net/extras/tabletools/button_options*/
                "sExtends": "xls",
                "sFileName": "xlsFileName.xls",
                "sButtonText": "",
                "sTitle": "Title of the file"
                /*"fnInit": function (node) { formatTableToolsButton(node, 'DTTT_button_xls'); }*/
            }
            /*, {
"sExtends": "pdf",
//"sButtonText": "",
"sFileName": "PdfFileName.pdf",
"sTitle": "Title of the file"
}*/
        ]
    }
});

/*When we edit the gridview, header and row are zigzag.
Call this to overcome it
*/
setTimeout(function () {
    oTable.fnAdjustColumnSizing();
}, 50);

/*after page load call this event, if there is a postback*/
if ($('.gvShowOrHideGvCols tr').length <= 0) $(".cbShowOrHideGvCols").css("display", "none");
$(".cbShowOrHideGvCols input[type=checkbox]").each(function () {
    ToggleGridViewCol('.gvShowOrHideGvCols', this, '');
});

/*when the checkbox checked changed*/
$(".cbShowOrHideGvCols input[type=checkbox]").change(function () {
    ToggleGridViewCol('.gvShowOrHideGvCols', this, '');
});

/*Remarks: if we want to show or hide gridview columns
  grid: GridView.ClientID
  ctrl: CheckBoxList control(if we are using foreach)
  colIndex: gridview column index we need to show/hide
  someValue: this the attribute added to the checkbox, which holds the checkbox value
  */
function ToggleGridViewCol(grid, ctrl, colIndex) {
    var col = (colIndex === '') ?
        $(ctrl).parent().attr('someValue') : colIndex;

    if (col != '') {
        var show = $(ctrl).is(":checked");
        if ($(grid + " tr").length <= 0) return true; //check gridview loaded/empty
        var oTable = $(grid).dataTable();
        var bVis = oTable.fnSettings().aoColumns[col].bVisible;

        if (show && !bVis)
            oTable.fnSetColumnVis(col, true);
        else if (!show && bVis)
            oTable.fnSetColumnVis(col, false);
    }
}

Setting minDate and maxDate for jquery datepicker

$(function () {
    var dateToday = new Date();
    var startDate = new Date(dateToday.getFullYear(), 
                 dateToday.getMonth(), dateToday.getDate() - 30);
    $("#txtFromDate").datepicker({
        minDate: startDate,
        maxDate: dateToday
    });
    $("#txtToDate").datepicker({
        minDate: startDate,
        maxDate: dateToday
    });
});