/***************************************************************************************
(C) 2008 Kishore Nallan for DesignShack
http://www.kishorelive.com
kishore.nc@gmail.com

Author's note:

The script below is a modified version of the jQuery fieldSelection plugin by Alex Brem
found at: http://blog.0xab.cd/?action=view&url=jquery-plugin-fieldselection

I have taken the liberty to build on original plugin to incorporate some additional 
features I wanted.
***************************************************************************************/

/*
 * jQuery plugin: fieldSelection - v0.1.0 - last change: 2006-12-16
 * (c) 2006 Alex Brem <alex@0xab.cd> - http://blog.0xab.cd
 *  modifications by Kishore on Oct 11, 2008  (kishore.nc@gmail.com) - http://www.kishorelive.com
 */

(function() {

  var fieldSelection = {

    getSelection: function() {

      var e = this.jquery ? this[0] : this;

      return (

        /* mozilla / dom 3.0 */
        ('selectionStart' in e && function() {
          var l = e.selectionEnd - e.selectionStart;
          return { start: e.selectionStart, end: e.selectionEnd, length: l, text: e.value.substr(e.selectionStart, l) };
        }) ||

        /* exploder */
        (document.selection && function() {

          e.focus();

          var r = document.selection.createRange();
          if (r == null) {
            return { start: 0, end: e.value.length, length: 0 }
          }

          var re = e.createTextRange();
          var rc = re.duplicate();
          re.moveToBookmark(r.getBookmark());
          rc.setEndPoint('EndToStart', re);

          return { start: rc.text.length, end: rc.text.length + r.text.length, length: r.text.length, text: r.text };
        }) ||

        /* browser not supported */
        function() {
          return { start: 0, end: e.value.length, length: 0 };
        }

      )();

    },

    replaceSelection: function() {

      var e = this.jquery ? this[0] : this;
      var text = arguments[0] || '';

      return (

        /* mozilla / dom 3.0 */
        ('selectionStart' in e && function() {
          
          var x = e.selectionStart; 
          if(text == "")
          {
            e.selectionStart--;
            e.value = e.value.substr(0, e.selectionStart) + text + e.value.substr(e.selectionEnd, e.value.length);
            e.selectionStart = x - 1;   
            e.selectionEnd = x - 1; 
          }
          else {
            e.value = e.value.substr(0, e.selectionStart) + text + e.value.substr(e.selectionEnd, e.value.length);
            x = x + text.length;
            e.selectionStart = x;  
            e.selectionEnd = x; 
          }
          return this;
        }) ||

        /* exploder */
        (document.selection && function() {
          
          e.focus();
          var range = document.selection.createRange();
          if(text == "")
          {
            if(range.text == "")
              range.moveStart("character", -1);
            range.text = text;
          }
          else
          {
              range.text = text;
              range.moveEnd("character", text.length - 1);
              //range.select();
          }
          
          return this;
        }) ||

        /* browser not supported */
        function() {
          
          if(text=="")
          {
            var str = e.val();
            e.val( str.substring(0,str.length - 1 ) );        
          }
          else
            e.value += text;
          
          return this;
        }

      )();

    }

  };

  jQuery.each(fieldSelection, function(i) { jQuery.fn[i] = this; });

})();