Various select form helpers in jQuery.

jQuery.fn.containsOption = function (query) {
  var found = false;

  this.each(function () {
    if (this.nodeName.toLowerCase() == 'select') {
      for (var i = 0; i < this.options.length; i++) {
        if (query.value) {
          found = (query.value.constructor == RegExp) ? this.options[i].value.match(query.value) : this.options[i].value == query.value;
        } else if (query.text) {
          found = (query.text.constructor == RegExp) ? this.options[i].text.match(query.text) : this.options[i].text == query.text;
        }
        if (found) break;
      }
    } else {
      return this;
    }
  });

  return found;
};

jQuery.fn.addOption = function (o) {
  var opt = o;

  this.each(function () {
    if (this.nodeName.toLowerCase() == 'select') {
      var option = document.createElement('OPTION');
      option.value = opt.value;
      option.text = opt.text;

      if (opt.selected) option.selected = opt.selected;

      this.options[this.options.length] = option;
    } else return this;
  });

  return this;
};

jQuery.fn.clearOptions = function () {
  this.each(function () {
    if (this.nodeName.toLowerCase() == 'select') {
      this.options.length = 0;
    }
  });
};

jQuery.fn.removeOptionByValue = function (val) {
  this.each(function () {
    if (this.nodeName.toLowerCase() == 'select') {
      for (var i = 0; i < this.options.length; i++) {
        if (this.options[i].value == val) {
          this.options[i] = null;
        }
      }
    } else {
      return this;
    }
  });
  return this;
};

jQuery.fn.removeOptionByText = function (txt) {
  this.each(function () {
    if (this.nodeName.toLowerCase() == 'select') {
      for (var i = 0; i < this.options.length; i++) {
        if (this.options[i].text == txt) {
          this.options[i] = null;
        }
      }
    } else {
      return this;
    }
  });
  return this;
};

jQuery.fn.selectOptionByValue = function (val) {
  this.each(function () {
    if (this.nodeName.toLowerCase() == 'select') {
      for (var i = 0; i < this.options.length; i++) {
        if (this.options[i].value == val) {
          this.options[i].selected = true;
        } else {
          this.options[i].selected = false;
        }
      }
    } else return this;
  });
  return this;
};

jQuery.fn.selectOptionByText = function (txt) {
  this.each(function () {
    if (this.nodeName.toLowerCase() == 'select') {
      for (var i = 0; i < this.options.length; i++) {
        if (this.options[i].text == txt) {
          this.options[i].selected = true;
        } else {
          this.options[i].selected = false;
        }
      }
    } else return this;
  });
  return this;
};

// USAGE
$('select#languages').containsOption({
  text: 'Text'
});

$('select#languages').containsOption({
  value: '19'
});

$('select#languages').selectOptionByValue('19');
$('select#languages').selectOptionByText('Apache');

$('select#languages').addOption({
  'text': 'rubyonrails',
  'value': '100'
});

$('select#languages').removeOptionByValue('19');
$('select#languages').removeOptionByText('Apache');

$('select#languages').clearOptions(); // deletes all options