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on screen keyboard using HTML and Java Script

Posted on 2008-10-30
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Medium Priority
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Last Modified: 2013-12-26
Hey Guys,

I'm building an on screen keyboard using HTML and Java Script..The Java Script and the HTML file are attached below .

Now the issue is that i'm running this on browsers( such as Mozilla & IE) then there is no issue. But my requirement over here is to run it on an emulator...That's like a TV emulator...to make it more clear just imagine it as a TV with a browser on it..but a browser about which i have no clue and that browser only shows me the text box and the show keyboard link....but when i click the show keyboard link it does not show me the keyboard..

The up & down movement is done through a Remote which is just like a TV remote.

I hope you guys can help me out on this because i'm stuck badly and i have only a day to resolve this

I have a solution in mind ..but please use it only after you hvae thought of your own solutions....the solution in my mind is that replacing the showelement or getelement with string.....I don't know how to do it...So if you guys can help me on this and replace it in my code then that would be very beneficial for me...

Help asap..
KEYBOARD.JS
 
function VKI_buildKeyboardInputs()
{
  var self = this;
 
  this.VKI_version = "1.11";
  this.VKI_target = this.VKI_visible = "";
  this.VKI_shift = this.VKI_capslock = this.VKI_alternate = this.VKI_dead = false;
  this.VKI_deadkeysOn = false;
  this.VKI_kt = "US";  // Default keyboard layout
  this.VKI_range = false;
  this.VKI_keyCenter = 3;
  this.VKI_isIE = /*@cc_on!@*/false;
  this.VKI_isIE6 = /*@if(@_jscript_version == 5.6)!@end@*/false;
  this.VKI_isMoz = typeof window.sidebar != "undefined";
 
 
  
  this.VKI_layout = new Object();
  this.VKI_layoutDDK = new Object();
 
  
 
  this.VKI_layout.Numpad = [ // Number pad
    [["$"], ["\u00a3"], ["\u20ac"], ["\u00a5"], ["/"], ["^"], ["Bksp", "Bksp"]],
    [["."], ["7"], ["8"], ["9"], ["*"], ["<"], ["("], ["["]],
    [["="], ["4"], ["5"], ["6"], ["-"], [">"], [")"], ["]"]],
    [["0"], ["1"], ["2"], ["3"], ["+"], ["Enter", "Enter"]],
    [[" "]]
  ];
  this.VKI_layoutDDK.Numpad = true;
 
  
 
  this.VKI_layout.US = [ // US Standard Keyboard
    [["`", "~"], ["1", "!"], ["2", "@"], ["3", "#"], ["4", "$"], ["5", "%"], ["6", "^"], ["7", "&"], ["8", "*"], ["9", "("], ["0", ")"], ["-", "_"], ["=", "+"], ["Bksp", "Bksp"]],
    [["Tab", "Tab"], ["q", "Q"], ["w", "W"], ["e", "E"], ["r", "R"], ["t", "T"], ["y", "Y"], ["u", "U"], ["i", "I"], ["o", "O"], ["p", "P"], ["[", "{"], ["]", "}"], ["\\", "|"]],
    [["Caps", "Caps"], ["a", "A"], ["s", "S"], ["d", "D"], ["f", "F"], ["g", "G"], ["h", "H"], ["j", "J"], ["k", "K"], ["l", "L"], [";", ":"], ["'", '"'], ["Enter", "Enter"]],
    [["Shift", "Shift"], ["z", "Z"], ["x", "X"], ["c", "C"], ["v", "V"], ["b", "B"], ["n", "N"], ["m", "M"], [",", "<"], [".", ">"], ["/", "?"], ["Shift", "Shift"]],
    [[" ", " "]]
  ];
 
  
printstring("1");
  
 
 
  /* ***** Find tagged input & textarea elements ******************* */
  var inputElems = [
    document.getElementsByTagName('input'),
    document.getElementsByTagName('textarea'),
  ]
  for (var x = 0, inputCount = 0, elem; elem = inputElems[x++];) {
    if (elem) {
      for (var y = 0, keyid = "", ex; ex = elem[y++];) {
        if ((ex.nodeName == "TEXTAREA" || ex.type == "text" || ex.type == "password") && ex.className.indexOf("keyboardInput") > -1) {
          if (!ex.id) {
            do { keyid = 'keyboardInputInitiator' + inputCount++; } while (document.getElementById(keyid));
            ex.id = keyid;
          } else keyid = ex.id;
		  			  document.getElementById("mylink").onclick = (function(a) { return function() { self.VKI_show(a); }; })(keyid);
         /* var keybut = document.createElement('img');
              keybut.src = "keyboard.png";
              keybut.alt = "Keyboard interface";
              keybut.className = "keyboardInputInitiator";
              keybut.title = "Display graphical keyboard interface";
              keybut.onclick = (function(a) { return function() { self.VKI_show(a); }; })(keyid);
 
          ex.parentNode.insertBefore(keybut, ex.nextSibling);*/
          if (!window.sidebar && !window.opera) {
            ex.onclick = ex.onkeyup = ex.onselect = function() {
              if (self.VKI_target.createTextRange) self.VKI_range = document.selection.createRange();
            };
          }
        }
      }
    }
  }
 
printstring("2");
  /* ***** Build the keyboard interface **************************** */
  this.VKI_keyboard = document.createElement('table');
  this.VKI_keyboard.id = "keyboardInputMaster";
  this.VKI_keyboard.cellSpacing = this.VKI_keyboard.cellPadding = this.VKI_keyboard.border = "0";
 
  var layouts = 0;
  for (ktype in this.VKI_layout) if (typeof this.VKI_layout[ktype] == "object") layouts++;
 
  var thead = document.createElement('thead');
    var tr = document.createElement('tr');
      var th = document.createElement('th');
        if (layouts > 1) {
          var kblist = document.createElement('select');
            for (ktype in this.VKI_layout) {
              if (typeof this.VKI_layout[ktype] == "object") {
                var opt = document.createElement('option');
                    opt.value = ktype;
 
                    opt.appendChild(document.createTextNode(ktype));
                  kblist.appendChild(opt);
              }
            }
              kblist.value = this.VKI_kt;
              kblist.onchange = function() {
                self.VKI_kt = this.value;
                self.VKI_buildKeys();
                self.VKI_position();
              };
          th.appendChild(kblist);
        }
printstring("3");
          var label = document.createElement('label');
            var checkbox = document.createElement('input');
                checkbox.type = "checkbox";
                checkbox.checked = this.VKI_deadkeysOn;
                checkbox.title = "Toggle dead key input";
                checkbox.onclick = function() {
                  self.VKI_deadkeysOn = this.checked;
                  this.nextSibling.nodeValue = " Dead keys: " + ((this.checked) ? "On" : "Off");
                  self.VKI_modify("");
                  return true;
                };
              label.appendChild(checkbox);
              label.appendChild(document.createTextNode(" Dead keys: " + ((checkbox.checked) ? "On" : "Off")))
          th.appendChild(label);
        tr.appendChild(th);
 
      var td = document.createElement('td');
        var clearer = document.createElement('span');
            clearer.id = "keyboardInputClear";
            clearer.appendChild(document.createTextNode("Clear"));
            clearer.title = "Clear this input";
            clearer.onmousedown = function() { this.className = "pressed"; };
            clearer.onmouseup = function() { this.className = ""; };
            clearer.onclick = function() {
              self.VKI_target.value = "";
              self.VKI_target.focus();
              return false;
            };
          td.appendChild(clearer);
 
        var closer = document.createElement('span');
            closer.id = "keyboardInputClose";
            closer.appendChild(document.createTextNode('X'));
            closer.title = "Close this window";
            closer.onmousedown = function() { this.className = "pressed"; };
            closer.onmouseup = function() { this.className = ""; };
            closer.onclick = function() { self.VKI_close(); };
          td.appendChild(closer);
 
        tr.appendChild(td);
      thead.appendChild(tr);
  this.VKI_keyboard.appendChild(thead);
printstring("4");
  var tbody = document.createElement('tbody');
    var tr = document.createElement('tr');
      var td = document.createElement('td');
          td.colSpan = "2";
        var div = document.createElement('div');
            div.id = "keyboardInputLayout";
          td.appendChild(div);
        var div = document.createElement('div');
          var ver = document.createElement('var');
              ver.appendChild(document.createTextNode("v" + this.VKI_version));
            div.appendChild(ver);
          td.appendChild(div);
        tr.appendChild(td);
      tbody.appendChild(tr);
  this.VKI_keyboard.appendChild(tbody);      
 
  if (this.VKI_isIE6) {
    this.VKI_iframe = document.createElement('iframe');
    this.VKI_iframe.style.position = "absolute";
    this.VKI_iframe.style.border = "0px none";
    this.VKI_iframe.style.filter = "mask()";
    this.VKI_iframe.style.zIndex = "999999";
  }
printstring("5");
 
  /* ***** Functions ************************************************ */
  /* ******************************************************************
   * Build or rebuild the keyboard keys
   *
   */
  this.VKI_buildKeys = function() {
    this.VKI_shift = this.VKI_capslock = this.VKI_alternate = this.VKI_dead = false;
    this.VKI_deadkeysOn = (this.VKI_layoutDDK[this.VKI_kt]) ? false : this.VKI_keyboard.getElementsByTagName('label')[0].getElementsByTagName('input')[0].checked;
 
    var container = this.VKI_keyboard.tBodies[0].getElementsByTagName('div')[0];
    while (container.firstChild) container.removeChild(container.firstChild);
 
    for (var x = 0, hasDeadKey = false, lyt; lyt = this.VKI_layout[this.VKI_kt][x++];) {
      var table = document.createElement('table');
          table.cellSpacing = table.cellPadding = table.border = "0";
      if (lyt.length <= this.VKI_keyCenter) table.className = "keyboardInputCenter";
        var tbody = document.createElement('tbody');
          var tr = document.createElement('tr');
          for (var y = 0, lkey; lkey = lyt[y++];) {
            if (!this.VKI_layoutDDK[this.VKI_kt] && !hasDeadKey)
              for (var z = 0; z < lkey.length; z++)
               // if (this.VKI_deadkey[lkey[z]]) hasDeadKey = true;
 
            var td = document.createElement('td');
                td.appendChild(document.createTextNode(lkey[0]));
 
              var alive = false;
            //  if (this.VKI_deadkeysOn) for (key in this.VKI_deadkey) if (key === lkey[0]) alive = true;
                td.className = (alive) ? "alive" : "";
              if (lyt.length > this.VKI_keyCenter && y == lyt.length)
                td.className += " last";
 
              if (lkey[0] == " ")
                td.style.paddingLeft = td.style.paddingRight = "50px";
                td.onmouseover = function() { if (this.className != "dead" && this.firstChild.nodeValue != "\xa0") this.className += " hover"; };
                td.onmouseout = function() { if (this.className != "dead") this.className = this.className.replace(/ ?(hover|pressed)/g, ""); };
                td.onmousedown = function() { if (this.className != "dead" && this.firstChild.nodeValue != "\xa0") this.className += " pressed"; };
                td.onmouseup = function() { if (this.className != "dead") this.className = this.className.replace(/ ?pressed/g, ""); };
                td.ondblclick = function() { return false; };
 
              switch (lkey[1]) {
                case "Caps":
                case "Shift":
                case "Alt":
                case "AltGr":
                  td.onclick = (function(type) { return function() { self.VKI_modify(type); return false; }})(lkey[1]);
                  break;
                case "Tab":
                  td.onclick = function() { self.VKI_insert("\t"); return false; };
                  break;
                case "Bksp":
                  td.onclick = function() {
                    self.VKI_target.focus();
                    if (self.VKI_target.setSelectionRange) {
                      var srt = self.VKI_target.selectionStart;
                      var len = self.VKI_target.selectionEnd;
                      if (srt < len) srt++;
                      self.VKI_target.value = self.VKI_target.value.substr(0, srt - 1) + self.VKI_target.value.substr(len);
                      self.VKI_target.setSelectionRange(srt - 1, srt - 1);
                    } else if (self.VKI_target.createTextRange) {
                     // try { self.VKI_range.select(); } catch(e) {}
                      self.VKI_range = document.selection.createRange();
                      if (!self.VKI_range.text.length) self.VKI_range.moveStart('character', -1);
                      self.VKI_range.text = "";
                    } else self.VKI_target.value = self.VKI_target.value.substr(0, self.VKI_target.value.length - 1);
                    if (self.VKI_shift) self.VKI_modify("Shift");
                    if (self.VKI_alternate) self.VKI_modify("AltGr");
                    return true;
                  };
                  break;
                case "Enter":
                  td.onclick = function() {
                    //if (self.VKI_target.nodeName == "TEXTAREA") { self.VKI_insert("\n"); } else self.VKI_close();
                    return true;
                  };
                  break;
                default:
                  td.onclick = function() {
                    if (self.VKI_deadkeysOn && self.VKI_dead) {
                      if (self.VKI_dead != this.firstChild.nodeValue) {
                        for (key in self.VKI_deadkey) {
                          if (key == self.VKI_dead) {
                            if (this.firstChild.nodeValue != " ") {
                              for (var z = 0, rezzed = false, dk; dk = self.VKI_deadkey[key][z++];) {
                                if (dk[0] == this.firstChild.nodeValue) {
                                  self.VKI_insert(dk[1]);
                                  rezzed = true;
                                  break;
                                }
                              }
                            } else {
                              self.VKI_insert(self.VKI_dead);
                              rezzed = true;
                            }
                            break;
                          }
                        }
                      } else rezzed = true;
                    }
                    self.VKI_dead = false;
 
                    if (!rezzed && this.firstChild.nodeValue != "\xa0") {
                      if (self.VKI_deadkeysOn) {
                        for (key in self.VKI_deadkey) {
                          if (key == this.firstChild.nodeValue) {
                            self.VKI_dead = key;
                            this.className = "dead";
                            if (self.VKI_shift) self.VKI_modify("Shift");
                            if (self.VKI_alternate) self.VKI_modify("AltGr");
                            break;
                          }
                        }
                        if (!self.VKI_dead) self.VKI_insert(this.firstChild.nodeValue);
                      } else self.VKI_insert(this.firstChild.nodeValue);
                    }
 
                    self.VKI_modify("");
                    return false;
                  };
 
              }
              tr.appendChild(td);
            tbody.appendChild(tr);
          table.appendChild(tbody);
 
          for (var z = lkey.length; z < 4; z++) lkey[z] = "\xa0";
      }
      container.appendChild(table);
    }
    this.VKI_keyboard.getElementsByTagName('label')[0].style.display = (hasDeadKey) ? "inline" : "none";
  };
 
  this.VKI_buildKeys();
  VKI_disableSelection(this.VKI_keyboard);
 
 
  /* ******************************************************************
   * Controls modifier keys
   *
   */
  this.VKI_modify = function(type) {
    switch (type) {
      case "Alt":
      case "AltGr": this.VKI_alternate = !this.VKI_alternate; break;
      case "Caps": this.VKI_capslock = !this.VKI_capslock; break;
      case "Shift": this.VKI_shift = !this.VKI_shift; break;
    }
    var vchar = 0;
    if (!this.VKI_shift != !this.VKI_capslock) vchar += 1;
 
    var tables = this.VKI_keyboard.getElementsByTagName('table');
    for (var x = 0; x < tables.length; x++) {
      var tds = tables[x].getElementsByTagName('td');
      for (var y = 0; y < tds.length; y++) {
        var dead = alive = target = false;
        var lkey = this.VKI_layout[this.VKI_kt][x][y];
 
        switch (lkey[1]) {
          case "Alt":
          case "AltGr":
            if (this.VKI_alternate) dead = true;
            break;
          case "Shift":
            if (this.VKI_shift) dead = true;
            break;
          case "Caps":
            if (this.VKI_capslock) dead = true;
            break;
          case "Tab": case "Enter": case "Bksp": break;
          default:
            if (type) tds[y].firstChild.nodeValue = lkey[vchar + ((this.VKI_alternate && lkey.length == 4) ? 2 : 0)];
            if (this.VKI_deadkeysOn) {
              var mychar = tds[y].firstChild.nodeValue;
              if (this.VKI_dead) {
                if (mychar == this.VKI_dead) dead = true;
                for (var z = 0; z < this.VKI_deadkey[this.VKI_dead].length; z++)
                  if (mychar == this.VKI_deadkey[this.VKI_dead][z][0]) { target = true; break; }
              } 
            //  for (key in this.VKI_deadkey) if (key === char) { alive = true; break; }
            }
        }
 
        tds[y].className = (dead) ? "dead" : ((target) ? "target" : ((alive) ? "alive" : ""));
        if (y == tds.length - 1 && tds.length > this.VKI_keyCenter) tds[y].className += " last";
      }
    }
    this.VKI_target.focus();
  };
 
 
  /* ******************************************************************
   * Insert text at the cursor
   *
   */
  this.VKI_insert = function(text) {
    this.VKI_target.focus();
    if (this.VKI_target.setSelectionRange) {
      var srt = this.VKI_target.selectionStart;
      var len = this.VKI_target.selectionEnd;
      this.VKI_target.value = this.VKI_target.value.substr(0, srt) + text + this.VKI_target.value.substr(len);
      if (text == "\n" && window.opera) srt++;
      this.VKI_target.setSelectionRange(srt + text.length, srt + text.length);
    } else if (this.VKI_target.createTextRange) {
     // try { this.VKI_range.select(); } catch(e) {}
      this.VKI_range = document.selection.createRange();
      this.VKI_range.text = text;
      this.VKI_range.collapse(true);
      this.VKI_range.select();
    } else this.VKI_target.value += text;
    if (this.VKI_shift) this.VKI_modify("Shift");
    if (this.VKI_alternate) this.VKI_modify("AltGr");
    this.VKI_target.focus();
  };
 
 
  /* ******************************************************************
   * Show the keyboard interface
   *
   */
  this.VKI_show = function(id) {
    if (this.VKI_target = document.getElementById(id)) {
      if (this.VKI_visible != id) {
        this.VKI_range = "";
       // try { this.VKI_keyboard.parentNode.removeChild(this.VKI_keyboard); } catch (e) {}
 
        var elem = this.VKI_target;
        this.VKI_target.keyboardPosition = "absolute";
        do {
          if (VKI_getStyle(elem, "position") == "fixed") {
            this.VKI_target.keyboardPosition = "fixed";
            break;
          }
        } while (elem == elem.offsetParent);
 
        this.VKI_keyboard.style.top = this.VKI_keyboard.style.right = this.VKI_keyboard.style.bottom = this.VKI_keyboard.style.left = "auto";
        this.VKI_keyboard.style.position = this.VKI_target.keyboardPosition;
        if (this.VKI_isIE6) document.body.appendChild(this.VKI_iframe);
        document.body.appendChild(this.VKI_keyboard);
 
        this.VKI_visible = this.VKI_target.id;
        this.VKI_position();
        this.VKI_target.focus();
      } else this.VKI_close();
    }
  };
 
 
  /* ******************************************************************
   * Position the keyboard
   *
   */
  this.VKI_position = function() {
    if (self.VKI_visible != "") {
      var inputElemPos = VKI_findPos(self.VKI_target);
      self.VKI_keyboard.style.top = inputElemPos[1] - ((self.VKI_target.keyboardPosition == "fixed" && !VKI_isIE && !this.VKI_isMoz) ? VKI_scrollDist()[1] : 0) + self.VKI_target.offsetHeight + 3 + "px";
      self.VKI_keyboard.style.left = Math.min(VKI_innerDimensions()[0] - self.VKI_keyboard.offsetWidth - 15, inputElemPos[0]) + "px";
      if (this.VKI_isIE6) {
        self.VKI_iframe.style.width = self.VKI_keyboard.offsetWidth + "px";
        self.VKI_iframe.style.height = self.VKI_keyboard.offsetHeight + "px";
        self.VKI_iframe.style.top = self.VKI_keyboard.style.top;
        self.VKI_iframe.style.left = self.VKI_keyboard.style.left;
      }
    }
  };
 
 
  if (window.addEventListener) {
    window.addEventListener('resize', this.VKI_position, false); 
  } else if (window.attachEvent)
    window.attachEvent('onresize', this.VKI_position);
 
 
  /* ******************************************************************
   * Close the keyboard interface
   *
   */
  /*this.VKI_close = function() {
    try {
      this.VKI_keyboard.parentNode.removeChild(this.VKI_keyboard);
      if (this.VKI_isIE6) this.VKI_iframe.parentNode.removeChild(this.VKI_iframe);
    } catch (e) {} 
    this.VKI_visible = "";
    this.VKI_target.focus();
    this.VKI_target = "";
  }; */ 
}
 
 
/* ***** Attach this script to the onload event ******************** */
if (window.addEventListener) {
  window.addEventListener('load', VKI_buildKeyboardInputs, false); 
} else if (window.attachEvent)
  window.attachEvent('onload', VKI_buildKeyboardInputs);
 
 
function VKI_findPos(obj) {
  var curleft = curtop = 0;
  do {
    curleft += obj.offsetLeft;
    curtop += obj.offsetTop;
  } while (obj == obj.offsetParent);
  return [curleft, curtop];
}
 
function VKI_innerDimensions() {
  if (self.innerHeight) {
    return [self.innerWidth, self.innerHeight];
  } else if (document.documentElement && document.documentElement.clientHeight) {
    return [document.documentElement.clientWidth, document.documentElement.clientHeight];
  } else if (document.body)
    return [document.body.clientWidth, document.body.clientHeight];
  return [0, 0];
}
 
function VKI_scrollDist() {
  var html = document.getElementsByTagName('html')[0];
  if (html.scrollTop && document.documentElement.scrollTop) {
    return [html.scrollLeft, html.scrollTop];
  } else if (html.scrollTop || document.documentElement.scrollTop)
    return [html.scrollLeft + document.documentElement.scrollLeft, html.scrollTop + document.documentElement.scrollTop];
  return [0, 0];
}
 
function VKI_getStyle(obj, styleProp) {
  if (obj.currentStyle) {
    var y = obj.currentStyle[styleProp];
  } else if (window.getComputedStyle)
    var y = window.getComputedStyle(obj, null)[styleProp];
  return y;
}
 
function VKI_disableSelection(elem) {
  elem.onselectstart = function() { return false; };
  elem.unselectable = "on";
  elem.style.MozUserSelect = "none";
  elem.style.cursor = "default";
  if (window.opera) elem.onmousedown = function() { return false; };
 
KEYBOARD.HTML:
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <title>IPTV keyboard</title>
  <link rel="stylesheet" type="text/css" href="keyboard.css" />
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8;" />
  <script type="text/javascript" src="keyboard.js" charset="UTF-8"></script>
  <style type="text/css">
 
#divfixed {
  border:2px solid #808088;
  background-color:#dddddf;
  position:fixed;
  bottom:250px;
  right:100px;
  padding:5px;
}
 
pre, code {
  background-color:oldlace;
}
  </style>
</head>
<a href="#" id="mylink">Show Keyboard</a>
<body>
<input type="text" value="" id="existing0" class="keyboardInput" />
</body>
</html>
}

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Question by:manas_sharma86
2 Comments
 
LVL 82

Expert Comment

by:hielo
ID: 22851110
>>But my requirement over here is to run it on an emulator
And where can we get this emulator?
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Accepted Solution

by:
manas_sharma86 earned 0 total points
ID: 22855933
Can't provide you the emulator....I understand it's not possible to do without it for you.....Sorry for the trouble.
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Learn how to create flexible layouts using relative units in CSS.  New relative units added in CSS3 include vw(viewports width), vh(viewports height), vmin(minimum of viewports height and width), and vmax (maximum of viewports height and width).
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