minad/olelo

// jquery-text-selection 1.0
(function() {

  /**
   *
   */
  var Selection = (function() {

      var hasRange = (typeof document.selection !== 'undefined' && typeof document.selection.createRange !== 'undefined');

    return {

      /**
       *
       */
      getSelectionRange: function(el) {

          var start,
              end,
              range,
            rangeLength,
            duplicateRange,
            textRange;

          el.focus();

          // Mozilla / Safari
          if (typeof el.selectionStart !== 'undefined') {

            start = el.selectionStart;
            end   = el.selectionEnd;

          // IE
          } else if (hasRange) {

            range = document.selection.createRange();
            rangeLength = range.text.length;

            if(range.parentElement() !== el) {
              throw('Unable to get selection range.');
            }

            // Textarea
            if (el.type === 'textarea') {

              duplicateRange = range.duplicate();
              duplicateRange.moveToElementText(el);
              duplicateRange.setEndPoint('EndToEnd', range);

              start = duplicateRange.text.length - rangeLength;

            // Text Input
            } else {

              textRange = el.createTextRange();
              textRange.setEndPoint("EndToStart", range);

              start = textRange.text.length;
            }

            end = start + rangeLength;

          // Unsupported type
          } else {
            throw('Unable to get selection range.');
          }

          return {
            start: start,
            end:   end
          };
      },


      /**
       *
       */
        getSelectionStart: function(el) {
        return this.getSelectionRange(el).start;
      },


      /**
       *
       */
      getSelectionEnd: function(el) {
        return this.getSelectionRange(el).end;
      },


      /**
       *
       */
      setSelectionRange: function(el, start, end) {

        var value,
            range;

          el.focus();

          if (typeof end === 'undefined') {
            end = start;
          }

          // Mozilla / Safari
          if (typeof el.selectionStart !== 'undefined') {

            el.setSelectionRange(start, end);

          // IE
          } else if (hasRange) {

          value = el.value;
            range = el.createTextRange();
            end   -= start + value.slice(start + 1, end).split("\n").length - 1;
            start -= value.slice(0, start).split("\n").length - 1;
            range.move('character', start);
            range.moveEnd('character', end);
            range.select();

          // Unsupported
          } else {
            throw('Unable to set selection range.');
          }
      },


      /**
       *
       */
      getSelectedText: function(el) {
          var selection = this.getSelectionRange(el);
          return el.value.substring(selection.start, selection.end);
      },


      /**
       *
       */
      insertText: function(el, text, start, end, selectText) {

        end = end || start;

            var textLength = text.length,
                selectionEnd  = start + textLength,
                beforeText = el.value.substring(0, start),
            afterText  = el.value.substr(end);

          el.value = beforeText + text + afterText;

          if (selectText === true) {
            this.setSelectionRange(el, start, selectionEnd);
          } else {
            this.setSelectionRange(el, selectionEnd);
          }
      },


      /**
       *
       */
      replaceSelectedText: function(el, text, selectText) {
          var selection = this.getSelectionRange(el);
            this.insertText(el, text, selection.start, selection.end, selectText);
      },


      /**
       *
       */
      wrapSelectedText: function(el, beforeText, afterText, selectText) {
          var text = beforeText + this.getSelectedText(el) + afterText;
            this.replaceSelectedText(el, text, selectText);
      }

    };
  })();


  /**
   *
   */
  window.Selection = Selection;


})();

(function($) {


  $.fn.extend({

    /**
     *
     */
    getSelectionRange: function() {
        return Selection.getSelectionRange(this[0]);
      },


    /**
     *
     */
      getSelectionStart: function() {
        return Selection.getSelectionStart(this[0]);
      },


    /**
     *
     */
      getSelectionEnd: function() {
        return Selection.getSelectionEnd(this[0]);
      },


    /**
     *
     */
      getSelectedText: function() {
        return Selection.getSelectedText(this[0]);
      },


    /**
     *
     */
      setSelectionRange: function(start, end) {
      return this.each(function() {
        Selection.setSelectionRange(this, start, end);
      });
      },


    /**
     *
     */
      insertText: function(text, start, end, selectText) {
      return this.each(function() {
        Selection.insertText(this, text, start, end, selectText);
      });
      },


    /**
     *
     */
      replaceSelectedText: function(text, selectText) {
      return this.each(function() {
        Selection.replaceSelectedText(this, text, selectText);
      });
      },


    /**
     *
     */
      wrapSelectedText: function(beforeText, afterText, selectText) {
      return this.each(function() {
        Selection.wrapSelectedText(this, beforeText, afterText, selectText);
      });
      }

  });


})(jQuery);