jquery_textarea_delete_last_word.js

/*
* fguillen: 2009-07-09 
* delete the last word from cursor on a textarea
* example: $('#my_textarea').deleteLastWord();
*/
jQuery.fn.deleteLastWord = function() {
  this.each(function(){
    if (this.selectionStart || this.selectionStart == '0') {
      var startPos = this.selectionStart;
      var endPos = this.selectionEnd;
      var scrollTop = this.scrollTop;

      var lastWord = $(this).lastWord();
      startPos = startPos - lastWord.length;
      
      this.value = 
          this.value.substring(0, startPos) + 
          this.value.substring(endPos, this.value.length);
      this.focus();
      this.selectionStart = startPos;
      this.selectionEnd = startPos;
      this.scrollTop = scrollTop;
    } else {
      alert("deleteLastWord not supported on this navigator");
    }
  });
};