​

/// <summary>Write finalText to the text/input box</summary>

Keyboard.prototype.writeFinalValue = function (finalText, caretPosition) {

​

    var scrollTop = this.textInputSource.scrollTop;

​

    if (typeof this.textInputSource.selectionStart == "number" && typeof this.textInputSource.selectionEnd == "number") {

        // Non-IE browsers and IE 9

        this.textInputSource.value = finalText;

​

        this.textInputSource.value = this.textInputSource.value;

        //        // Move the caret

        //        this.textInputSource.selectionStart = caretPosition;

        //        this.textInputSource.selectionEnd = caretPosition;

    }

    else if (document.selection && document.selection.createRange) {

        // For IE up to version 8

        var selectionRange = document.selection.createRange();

        var textInputRange = this.textInputSource.createTextRange();

        var precedingRange = this.textInputSource.createTextRange();

        var bookmark = selectionRange.getBookmark();

        textInputRange.moveToBookmark(bookmark);

        precedingRange.setEndPoint("EndToStart", textInputRange);

        var start = precedingRange.text.length;

        var end = start + selectionRange.text.length;

​

        this.value = finalText;

​

        //        // Move the caret

        //        textInputRange = this.createTextRange();

        //        textInputRange.collapse(true);

        //        textInputRange.move("character", start - (this.textInputRange.value.slice(0, start).split("\r\n").length - 1));

        //        textInputRange.select();

    }

​

    this.textInputSource.focus();

    this.textInputSource.scrollTop = scrollTop;

​

    // move caret

    if (this.textInputSource.setSelectionRange) {

        this.textInputSource.setSelectionRange(caretPosition, caretPosition);

//        this.textInputSource.value = this.textInputSource.value;

    }

    else if (this.textInputSource.createTextRange) {

        var range = this.textInputSource.createTextRange();

        range.collapse(true);

        range.moveEnd('character', caretPosition);

        range.moveStart('character', caretPosition);

        range.select();

    }

}

  /**************************************** END ***************************/

​

​

function passId(oTextbox) {

    var inputbox = oTextbox;

​

    //var global;

    var stack = [];

    global = new GlobalVariable();

    global.operaDetected = !!window.opera;

    _CurrentLanguage = "bn_BD";

​

    inputbox.onkeydown = function (keyEvent) {

        /*

        operai keydown e kaj kora jabe na.....keypress e kora lagbe.

        So jodi opera hoi taile editor exit kora hobe...Presto engine er bakigulir jonneo tai

        */

        var oEvent = window.event || keyEvent;

        var oSource = oEvent.srcElement || oEvent.target;

        var keyboard = new Keyboard(oEvent, oSource);

​

        var returnValue = keyboard.handleKeyboardInput(oEvent, oSource);

        return returnValue;

    }

​

    inputbox.onkeypress = function (keyEvent) {

        //        var oEvent = window.event || keyEvent;

        //        var oSource = oEvent.srcElement || oEvent.target;

        //        var keyboard = new Keyboard( oEvent, oSource);

        //        alert(keyboard);

        //return !!window.opera;//  && keyboard.handleKeyboardInput(oEvent,oSource);

        //return false;

    }

​

​

    inputbox.onkeyup = function (keyEvent) {

        //return false;

        //        var oEvent = window.event || keyEvent;

        //        var oSource = oEvent.srcElement || oEvent.target;

        //        var keyboard = new Keyboard( oEvent, oSource);

        //        alert(keyboard);

        //        return global.operaDetected  && keyboard.handleKeyboardInput(oEvent,oSource);

    }

/* 

inputbox.onmousedown= function (keyEvent)

{

var oEvent= window.event || keyEvent;

var oSource= oEvent.srcElement || oEvent.target;

if( oEvent.button == 0)

{

//updateRange(oEvent.rangeOffset);

}

return true;

}

//inputbox.focus(); 

*/

    //if (stack.length > 0) global = stack.pop();

}

​

Keyboard.prototype.handleKeyboardInput = function () {

    var prev = "", prevPrev = "", next = "", nextNext = "", text = this.textInputSource.value;

​

    var keyState = this.selectKeyPressed();

​

    //return true;

    /// <summary>Decision; Should script continue or not</summary>

    if (!!keyState.iShouldDealIt == false) return true;

​

    if (global.currentLanguage == "en_US") {

        return true;

    }

​

    // set prev and next characters

    if (keyState.placeTo >= 2) {

        prevPrev = text.charAt(keyState.placeTo - 2);

        prev = text.charAt(keyState.placeTo - 1);

    }

    else if (keyState.placeTo >= 1)

        prev = text.charAt(keyState.placeTo - 1);

​

    if (keyState.placeTo >= 0 && keyState.placeTo <= this.textInputSource.value.length - 2) {

        nextNext = this.textInputSource.value.charAt(keyState.placeTo + 1);

        next = this.textInputSource.value.charAt(keyState.placeTo + 0);

    }

    else if (keyState.placeTo >= 0 && keyState.placeTo <= this.textInputSource.value.length - 1)

        next = this.textInputSource.value.charAt(keyState.placeTo + 0);

​

​

    /************************************** 

    unicodeKey change if necessary

    ***************************************/

    // replace last-character

    if (keyState.replaceLastChar) {

        // hasanta

        if (prev == "\u09CD") {

            keyState.unicodeKey = "\u002B";

        }

        // other

        else keyState.unicodeKey = global.bd.getFollower(prev, 2);

​

        // if valid key reduce start position-1 because this will not be inserted

        if (keyState.unicodeKey.length > 0) {

            keyState.placeTo -= 1;

            keyState.position.start -= 1;

        }

    }

​

    // prev not a consonant then change vowel...

    if (global.bd.getFollower(keyState.unicodeKey, 1) == 2 &&

        (global.bd.getFollower(prev, 1) == 1 || global.bd.getFollower(prev, 1) == 3) == false) {

​

        keyState.unicodeKey = global.bd.getFollower(keyState.unicodeKey, 2);

    }

    // prev is hasanta but current key is not consonant/fola...

    if (prev == "\u09CD" && keyState.unicodeKey.length > 0 &&

        (global.bd.getFollower(keyState.unicodeKey, 1) == 1 || global.bd.getFollower(keyState.unicodeKey, 1) == 3) == false) {

​

        keyState.unicodeKey = global.ZWNJ + keyState.unicodeKey;

    }

    // next is hasanta but current key is not consonant/fola...

    if (next == "\u09CD" && keyState.unicodeKey.length > 0 &&

        (global.bd.getFollower(keyState.unicodeKey, 1) == 1 || global.bd.getFollower(keyState.unicodeKey, 1) == 3) == false) {

​

        keyState.unicodeKey = global.ZWNJ + keyState.unicodeKey;

    }

​

    // fullstop button pressed twice will cause a dot ..

    if (prev == "\u0964" && keyState.unicodeKey == "\u0964") {

        keyState.unicodeKey = "\u002E";

        keyState.position.start -= 1;

    }

​

    /// <summary>Backspace or Delete</summary>

    // prevPrev is hasanta

    if (keyState.code == 8) {

​

        // if end==start then selected text so cursor should not move; otherwise should

        keyState.position.start -= +(keyState.position.start == keyState.position.end);

        keyState.position.start -= prevPrev == "\u09CD" ? 1 : 0;

        if (keyState.position.start < 0)

            keyState.position.start = 0;

    }

    // nextNext is hasanta

    if (keyState.code == 46) {

​

        // if end==start then selected text so cursor should not move; otherwise should

        keyState.position.end += +(keyState.position.start == keyState.position.end);

        keyState.position.end += nextNext == "\u09CD" ? 1 : 0;

    }

​

​

    /// <summary>Final data preparation</summary>

    var firstPortion = text.slice(0, keyState.position.start);

    var lastPortion = text.slice(keyState.position.end);

    var finalText = firstPortion + keyState.unicodeKey + lastPortion;

    var caretPosition = keyState.position.start + keyState.unicodeKey.length;

​

    /// <summary>Write final data and update caret</summary>

    this.writeFinalValue(finalText, caretPosition);

​

    return false;

}

​

/// <summary>Select and return which key is pressed</summary>

Keyboard.prototype.selectKeyPressed = function () {

​

    var code = this.oEvent.keyCode || this.oEvent.which;

    var codeAsCharacter = String.fromCharCode(this.oEvent.keyCode || this.oEvent.which);

    var position = this.cursorPosition();

​

    // delete or backspace or dot-button or plus-button key

    if (code == 8 || code == 46) {

        return {

            code: code,

            unicodeKey: "",

            iShouldDealIt: true,

            placeTo: position.start,

            position: position

        }

    }

    ///  ctrl, shift, alt, alt-grp, up arrow, down arrow

    if (this.oEvent.ctrlKey || this.oEvent.altKey || code < 32 || (code >= 37 && code <= 40)) {

        // using ctrl+m button to language switch

        if (this.oEvent.ctrlKey && code == 77) {

            var _C = global.currentLanguage == "bn_BD" ? "en_US" : "bn_BD";

            global.currentLanguage = _C;

        }

        return {

            code: code,

            iShouldDealIt: false

        }

    }

​

    var unicodeKey = "";

​

    if (code >= 65 && code <= 90) {

        unicodeKey = global.letterKeyMap[code - 65][+!!this.oEvent.shiftKey];

    }

    else if (code >= 48 && code <= 57) {

        unicodeKey = global.numberKeyMap[code - 48][+!!this.oEvent.shiftKey];

    }

    else if ((code == 190 || code == 110) && !this.oEvent.shiftKey) // full-stop from keyboard/numpad

        unicodeKey = '\u0964';

    else if ((code == 107) && this.oEvent.shiftKey) // shift with plus-sign, replace with Q[0] or hasanta

        unicodeKey = global.letterKeyMap[81 - 65][0];

    // opera tweak for + button

    else if (!!window.opera && code == 61 && this.oEvent.shiftKey)

        unicodeKey = global.letterKeyMap[81 - 65][0];

    else return {

        code: code,

        iShouldDealIt: false

    };

    /*

    // . or +

    flag = flag || (codeAsCharacter == '.' || codeAsCharacter == '+');

​

    = flag ? global.letterKeyMap[code - 65][+!!this.oEvent.shiftKey] : "";

    // h|| full-Stop || plus-Sign

    var replaceLastChar = 

    (code == 72 || code == 190 || code == 107) && !this.oEvent.shiftKey;

    var position = this.cursorPosition();

    */

    // h|| full-Stop || plus-Sign

    var replaceLastChar =

            (code == 72 || 1 == 2) && !this.oEvent.shiftKey;

​

    return {

        code: code, // =65

        iShouldDealIt: true, // =false

​

        unicodeKey: unicodeKey, // ="\u0041"

        shiftKeyPressed: this.oEvent.shiftKey, // =false        

        replaceLastChar: replaceLastChar, // =false

        placeTo: position.start, // =3

        position: position // { 1,8 }

    };

}

​

Keyboard.prototype.asciiValue = function (c) {

    // restrict input to a single character

    c = c.charAt(0);

    // loop through all possible ASCII values

    var i;

    for (i = 0; i < 256; ++i) {

        if (unescape('%' + i.toString(16)) == c)

            return i;

    }

    return null;

}

​

​

​

​

​

function Keyboard(oEvent, oSource) {

    this.textInputSource = oSource;

    this.oEvent = oEvent;

​

    this.cursorPosition = function () {

        //var textarea = document.getElementById("myTextArea");

        var start=0, end=0;

        if (typeof this.textInputSource.selectionStart == "number"

            && typeof this.textInputSource.selectionEnd == "number") {

            // Non-IE browsers and IE 9

            start = this.textInputSource.selectionStart;

            end = this.textInputSource.selectionEnd;

        }

        else if (document.selection && document.selection.createRange) {

            // For IE up to version 8

            var selectionRange = document.selection.createRange();

            var textInputRange = this.textInputSource.createTextRange();

            var precedingRange = this.textInputSource.createTextRange();

            var bookmark = selectionRange.getBookmark();

            textInputRange.moveToBookmark(bookmark);

            precedingRange.setEndPoint("EndToStart", textInputRange);

            start = precedingRange.text.length;

            end = start + selectionRange.text.length;

        }

        return {

            start: start,

            end: end

        }

    }

}

​

​

/// <summary>Global Variable Class</summary>

function GlobalVariable() {

    this.bd = new Letter_Information();

    this.currentLanguage = "bn_BD";

    this.operaDetected = false;

    this.replaceLastChar = false; // eita ka er por h dile  kha( khata) likha hoe jai ei typer support ditey lagbe

    this.ZWNJ = "\u200c";

    this.ZWJ = "\u200d";

​

    this.letterKeyMap =

    [

        ["\u09be", "\u0985"], // aa-kar and onamika......... A

        ["\u09ac", "\u0981"], // bandorban and chondrobindu..... B

        ["\u099a", "\u099b"], // chirokaal and chobi...... C

        ["\u09a1", "\u09a6"], // dahu and dekha...... D

        ["\u09c7", "\u09c8"], // emni and oirabot...... E

        ["\u09ab", "\u09a5"], // ful and thimpu...... F

        ["\u0997", "\u0998"], // gotokal and ghatshila...... G

        ["", "\u09b9"], // ____ and hotath...... H

        ["\u09bf", "\u09c0"], // ishrat and iishaan...... I

        ["\u099c", "\u099d"], // jonogon and jhargram...... J

        ["\u0995", "\u0996"], // kotha and khagrachori...... K

        ["\u09b2", "\u09b6"], // lalmonirhaat and shorot...... L

        ["\u09ae", "\u0983"], // minisha and dukkho...... M

        ["\u09a8", "\u09a3"], // notun and notto-bidhan...... N

        ["\u09cb", "\u09cc"], // oli and oushodh...... O

        ["\u09aa", "\u09ab"], // polashi and farlin...... P

        ["\u09cd", "\u09dd"], // hasanta and ashaar...... Q

        ["\u09b0", "\u09dc"], // rinita and jhor....... R

        ["\u09b8", "\u09b7"], // seoul and sholoi-december...... S

        ["\u099f", "\u09A4"], // tipaimukh and tutul...... T

        ["\u09c1", "\u09c2"], // uttom and usha...... U

        ["\u09ad", "\u0982"], // vrammoman and itong-bitong...... V

        ["\u09c3", "\u09a7"], // rii-kar and dhakesshori...... W

        ["\u0999", "\u099e"], // 5th and 10th consonant...... X

        ["\u09df", "\u09cd\u09af"], // ayan and z-fola...... Y

        ["\u09af", "\u09ce"], // zoti and khanda-ta...... Z

    ];

    this.numberKeyMap =

    [

        "\u09e6", "\u09e7", "\u09e8", "\u09e9", "\u09ea", "\u09eb", "\u09ec", "\u09ed", "\u09ee", "\u09ef"

    ];

​

​

}

​

/// <summary>Letter Information Class</summary>

function Letter_Information() {

    ;

}

/* <summary>

format:  bengali letter, type, follower

Types of letters in bd =

1   = consonant

2   = vowel in kar form

3   = fola

4   = hasanta

5   = zero width non joiner

6   = mandatory end like khanda-ta

7   = vowel in Full form

</summary>

*/

Letter_Information.prototype.letter_info =

[

    ["\u200d", 5, ""], ["\u0964", 1, "\u002e"], ["\u0981", 6, ""], ["\u0982", 6, ""], ["\u0983", 6, ""], ["\u0985", 7, ""], ["\u0986", 7, "\u200d\u09BE"], ["\u0987", 7, "\u200d\u09bf"], ["\u0988", 7, "\u200d\u09c0"], ["\u0989", 7, "\u200d\u09c1"], ["\u098a", 7, "\u200d\u09c2"], ["\u098b", 7, "\u200d\u09c3"], ["\u098f", 7, "\u200d\u09c7"], ["\u0990", 7, "\u200d\u09c8"], ["\u0993", 7, "\u200d\u09cb"], ["\u0994", 7, "\u200d\u09cc"], /*kobor*/["\u0995", 1, "\u0996"], ["\u0996", 1, ""], ["\u0997", 1, "\u0998"], ["\u0998", 1, ""], ["\u0999", 1, ""], /*cholonto*/["\u099a", 1, "\u099b"], ["\u099b", 1, ""], ["\u099c", 1, "\u099d"], ["\u099d", 1, ""], ["\u099e", 1, ""], /*tonkar*/["\u099f", 1, "\u09a0"], ["\u09a0", 1, ""], ["\u09a1", 1, "\u09a2"], ["\u09a2", 1, ""], ["\u09a3", 3, ""], /*tutul*/["\u09a4", 1, "\u09a5"], ["\u09a5", 1, ""], ["\u09a6", 1, "\u09a7"], ["\u09a7", 1, ""], ["\u09a8", 1, ""], /*paloan*/["\u09aa", 1, "\u09ab"], ["\u09ab", 1, ""], ["\u09ac", 3, "\u09ad"], ["\u09ad", 1, ""], ["\u09ae", 1, ""], ["\u09af", 3, ""], ["\u09b0", 3, "\u09dc"], ["\u09b2", 1, ""], /*shosank*/["\u09b6", 1, ""], ["\u09b7", 1, ""], ["\u09b8", 1, "\u09b6"], ["\u09b9", 1, ""], /*ami-amra*/["\u09be", 2, "\u0986"], ["\u09bf", 2, "\u0987"], ["\u09c0", 2, "\u0988"], ["\u09c1", 2, "\u0989"], ["\u09c2", 2, "\u098a"], ["\u09c3", 2, "\u098b"], ["\u09c7", 2, "\u098f"], ["\u09c8", 2, "\u0990"], ["\u09cb", 2, "\u0993"], ["\u09cc", 2, "\u0994"], ["\u09cd", 4, "\u09cd\u200c"], ["\u09ce", 6, "\u0988"], ["\u09d7", 2, "\u0988"], ["\u09dc", 1, "\u09dd"], ["\u09dd", 1, ""], ["\u09df", 1, ""], ["\u09f7", 1, "\u002e"], ["\u09fb", 1, ""], ["\u09fc", 1, ""]

];

/// <summary>binary search for a follower value</summary>

Letter_Information.prototype.getFollower = function (inputValue, propertyNo) {

    var start = 0;

    var end = this.letter_info.length - 1;

    var mid = Math.floor((end + start) / 2);

​

    for (; end >= start; mid = Math.floor((end + start) / 2)) {

        if (this.letter_info[mid][0] == inputValue)

            return this.letter_info[mid][propertyNo];

        if (this.letter_info[mid][0] > inputValue)

            end = mid - 1;

        else

            start = mid + 1;

    }

​

    return "";

}