/*
 *
 * Copyright (c) 2006-2009 Sam Collett (http://www.texotela.co.uk)
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 *
 * Version 2.2.4
 * Demo: http://www.texotela.co.uk/code/jquery/select/
 *
 * $LastChangedDate: 2009-02-08 00:28:12 +0000 (Sun, 08 Feb 2009) $
 * $Rev: 6185 $
 *
 */
 
;(function($) {
 
/**
 * Adds (single/multiple) options to a select box (or series of select boxes)
 *
 * @name     addOption
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @example  $("#myselect").addOption("Value", "Text"); // add single value (will be selected)
 * @example  $("#myselect").addOption("Value 2", "Text 2", false); // add single value (won't be selected)
 * @example  $("#myselect").addOption({"foo":"bar","bar":"baz"}, false); // add multiple values, but don't select
 *
 */
$.fn.addOption = function()
{
  var add = function(el, v, t, sO)
  {
    var option = document.createElement("option");
    option.value = v, option.text = t;
    // get options
    var o = el.options;
    // get number of options
    var oL = o.length;
    if(!el.cache)
    {
      el.cache = {};
      // loop through existing options, adding to cache
      for(var i = 0; i < oL; i++)
      {
        el.cache[o[i].value] = i;
      }
    }
    // add to cache if it isn't already
    if(typeof el.cache[v] == "undefined") el.cache[v] = oL;
    el.options[el.cache[v]] = option;
    if(sO)
    {
      option.selected = true;
    }
  };
  
  var a = arguments;
  if(a.length == 0) return this;
  // select option when added? default is true
  var sO = true;
  // multiple items
  var m = false;
  // other variables
  var items, v, t;
  if(typeof(a[0]) == "object")
  {
    m = true;
    items = a[0];
  }
  if(a.length >= 2)
  {
    if(typeof(a[1]) == "boolean") sO = a[1];
    else if(typeof(a[2]) == "boolean") sO = a[2];
    if(!m)
    {
      v = a[0];
      t = a[1];
    }
  }
  this.each(
    function()
    {
      if(this.nodeName.toLowerCase() != "select") return;
      if(m)
      {
        for(var item in items)
        {
          add(this, item, items[item], sO);
        }
      }
      else
      {
        add(this, v, t, sO);
      }
    }
  );
  return this;
};

/**
 * Add options via ajax
 *
 * @name     ajaxAddOption
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @param    String url      Page to get options from (must be valid JSON)
 * @param    Object params   (optional) Any parameters to send with the request
 * @param    Boolean select  (optional) Select the added options, default true
 * @param    Function fn     (optional) Call this function with the select object as param after completion
 * @param    Array args      (optional) Array with params to pass to the function afterwards
 * @example  $("#myselect").ajaxAddOption("myoptions.php");
 * @example  $("#myselect").ajaxAddOption("myoptions.php", {"code" : "007"});
 * @example  $("#myselect").ajaxAddOption("myoptions.php", {"code" : "007"}, false, sortoptions, [{"dir": "desc"}]);
 *
 */
$.fn.ajaxAddOption = function(url, params, select, fn, args)
{
  if(typeof(url) != "string") return this;
  if(typeof(params) != "object") params = {};
  if(typeof(select) != "boolean") select = true;
  this.each(
    function()
    {
      var el = this;
      $.getJSON(url,
        params,
        function(r)
        {
          $(el).addOption(r, select);
          if(typeof fn == "function")
          {
            if(typeof args == "object")
            {
              fn.apply(el, args);
            } 
            else
            {
              fn.call(el);
            }
          }
        }
      );
    }
  );
  return this;
};

/**
 * Removes an option (by value or index) from a select box (or series of select boxes)
 *
 * @name     removeOption
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @param    String|RegExp|Number what  Option to remove
 * @param    Boolean selectedOnly       (optional) Remove only if it has been selected (default false)   
 * @example  $("#myselect").removeOption("Value"); // remove by value
 * @example  $("#myselect").removeOption(/^val/i); // remove options with a value starting with 'val'
 * @example  $("#myselect").removeOption(/./); // remove all options
 * @example  $("#myselect").removeOption(/./, true); // remove all options that have been selected
 * @example  $("#myselect").removeOption(0); // remove by index
 * @example  $("#myselect").removeOption(["myselect_1","myselect_2"]); // values contained in passed array
 *
 */
$.fn.removeOption = function()
{
  var a = arguments;
  if(a.length == 0) return this;
  var ta = typeof(a[0]);
  var v, index;
  // has to be a string or regular expression (object in IE, function in Firefox)
  if(ta == "string" || ta == "object" || ta == "function" )
  {
    v = a[0];
    // if an array, remove items
    if(v.constructor == Array)
    {
      var l = v.length;
      for(var i = 0; i<l; i++)
      {
        this.removeOption(v[i], a[1]); 
      }
      return this;
    }
  }
  else if(ta == "number") index = a[0];
  else return this;
  this.each(
    function()
    {
      if(this.nodeName.toLowerCase() != "select") return;
      // clear cache
      if(this.cache) this.cache = null;
      // does the option need to be removed?
      var remove = false;
      // get options
      var o = this.options;
      if(!!v)
      {
        // get number of options
        var oL = o.length;
        for(var i=oL-1; i>=0; i--)
        {
          if(v.constructor == RegExp)
          {
            if(o[i].value.match(v))
            {
              remove = true;
            }
          }
          else if(o[i].value == v)
          {
            remove = true;
          }
          // if the option is only to be removed if selected
          if(remove && a[1] === true) remove = o[i].selected;
          if(remove)
          {
            o[i] = null;
          }
          remove = false;
        }
      }
      else
      {
        // only remove if selected?
        if(a[1] === true)
        {
          remove = o[index].selected;
        }
        else
        {
          remove = true;
        }
        if(remove)
        {
          this.remove(index);
        }
      }
    }
  );
  return this;
};

/**
 * Sort options (ascending or descending) in a select box (or series of select boxes)
 *
 * @name     sortOptions
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @param    Boolean ascending   (optional) Sort ascending (true/undefined), or descending (false)
 * @example  // ascending
 * $("#myselect").sortOptions(); // or $("#myselect").sortOptions(true);
 * @example  // descending
 * $("#myselect").sortOptions(false);
 *
 */
$.fn.sortOptions = function(ascending)
{
  // get selected values first
  var sel = $(this).selectedValues();
  var a = typeof(ascending) == "undefined" ? true : !!ascending;
  this.each(
    function()
    {
      if(this.nodeName.toLowerCase() != "select") return;
      // get options
      var o = this.options;
      // get number of options
      var oL = o.length;
      // create an array for sorting
      var sA = [];
      // loop through options, adding to sort array
      for(var i = 0; i<oL; i++)
      {
        sA[i] = {
          v: o[i].value,
          t: o[i].text
        }
      }
      // sort items in array
      sA.sort(
        function(o1, o2)
        {
          // option text is made lowercase for case insensitive sorting
          o1t = o1.t.toLowerCase(), o2t = o2.t.toLowerCase();
          // if options are the same, no sorting is needed
          if(o1t == o2t) return 0;
          if(a)
          {
            return o1t < o2t ? -1 : 1;
          }
          else
          {
            return o1t > o2t ? -1 : 1;
          }
        }
      );
      // change the options to match the sort array
      for(var i = 0; i<oL; i++)
      {
        o[i].text = sA[i].t;
        o[i].value = sA[i].v;
      }
    }
  ).selectOptions(sel, true); // select values, clearing existing ones
  return this;
};
/**
 * Selects an option by value
 *
 * @name     selectOptions
 * @author   Mathias Bank (http://www.mathias-bank.de), original function
 * @author   Sam Collett (http://www.texotela.co.uk), addition of regular expression matching
 * @type     jQuery
 * @param    String|RegExp|Array value  Which options should be selected
 * can be a string or regular expression, or an array of strings / regular expressions
 * @param    Boolean clear  Clear existing selected options, default false
 * @example  $("#myselect").selectOptions("val1"); // with the value 'val1'
 * @example  $("#myselect").selectOptions(["val1","val2","val3"]); // with the values 'val1' 'val2' 'val3'
 * @example  $("#myselect").selectOptions(/^val/i); // with the value starting with 'val', case insensitive
 *
 */
$.fn.selectOptions = function(value, clear)
{
  var v = value;
  var vT = typeof(value);
  // handle arrays
  if(vT == "object" && v.constructor == Array)
  {
    var $this = this;
    $.each(v, function()
      {
              $this.selectOptions(this, clear);
          }
    );
  };
  var c = clear || false;
  // has to be a string or regular expression (object in IE, function in Firefox)
  if(vT != "string" && vT != "function" && vT != "object") return this;
  this.each(
    function()
    {
      if(this.nodeName.toLowerCase() != "select") return this;
      // get options
      var o = this.options;
      // get number of options
      var oL = o.length;
      for(var i = 0; i<oL; i++)
      {
        if(v.constructor == RegExp)
        {
          if(o[i].value.match(v))
          {
            o[i].selected = true;
          }
          else if(c)
          {
            o[i].selected = false;
          }
        }
        else
        {
          if(o[i].value == v)
          {
            o[i].selected = true;
          }
          else if(c)
          {
            o[i].selected = false;
          }
        }
      }
    }
  );
  return this;
};

/**
 * Copy options to another select
 *
 * @name     copyOptions
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @param    String to  Element to copy to
 * @param    String which  (optional) Specifies which options should be copied - 'all' or 'selected'. Default is 'selected'
 * @example  $("#myselect").copyOptions("#myselect2"); // copy selected options from 'myselect' to 'myselect2'
 * @example  $("#myselect").copyOptions("#myselect2","selected"); // same as above
 * @example  $("#myselect").copyOptions("#myselect2","all"); // copy all options from 'myselect' to 'myselect2'
 *
 */
$.fn.copyOptions = function(to, which)
{
  var w = which || "selected";
  if($(to).size() == 0) return this;
  this.each(
    function()
    {
      if(this.nodeName.toLowerCase() != "select") return this;
      // get options
      var o = this.options;
      // get number of options
      var oL = o.length;
      for(var i = 0; i<oL; i++)
      {
        if(w == "all" || (w == "selected" && o[i].selected))
        {
          $(to).addOption(o[i].value, o[i].text);
        }
      }
    }
  );
  return this;
};

/**
 * Checks if a select box has an option with the supplied value
 *
 * @name     containsOption
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     Boolean|jQuery
 * @param    String|RegExp value  Which value to check for. Can be a string or regular expression
 * @param    Function fn          (optional) Function to apply if an option with the given value is found.
 * Use this if you don't want to break the chaining
 * @example  if($("#myselect").containsOption("val1")) alert("Has an option with the value 'val1'");
 * @example  if($("#myselect").containsOption(/^val/i)) alert("Has an option with the value starting with 'val'");
 * @example  $("#myselect").containsOption("val1", copyoption).doSomethingElseWithSelect(); // calls copyoption (user defined function) for any options found, chain is continued
 *
 */
$.fn.containsOption = function(value, fn)
{
  var found = false;
  var v = value;
  var vT = typeof(v);
  var fT = typeof(fn);
  // has to be a string or regular expression (object in IE, function in Firefox)
  if(vT != "string" && vT != "function" && vT != "object") return fT == "function" ? this: found;
  this.each(
    function()
    {
      if(this.nodeName.toLowerCase() != "select") return this;
      // option already found
      if(found && fT != "function") return false;
      // get options
      var o = this.options;
      // get number of options
      var oL = o.length;
      for(var i = 0; i<oL; i++)
      {
        if(v.constructor == RegExp)
        {
          if (o[i].value.match(v))
          {
            found = true;
            if(fT == "function") fn.call(o[i], i);
          }
        }
        else
        {
          if (o[i].value == v)
          {
            found = true;
            if(fT == "function") fn.call(o[i], i);
          }
        }
      }
    }
  );
  return fT == "function" ? this : found;
};

/**
 * Returns values which have been selected
 *
 * @name     selectedValues
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     Array
 * @example  $("#myselect").selectedValues();
 *
 */
$.fn.selectedValues = function()
{
  var v = [];
  this.selectedOptions().each(
    function()
    {
      v[v.length] = this.value;
    }
  );
  return v;
};

/**
 * Returns text which has been selected
 *
 * @name     selectedTexts
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     Array
 * @example  $("#myselect").selectedTexts();
 *
 */
$.fn.selectedTexts = function()
{
  var t = [];
  this.selectedOptions().each(
    function()
    {
      t[t.length] = this.text;
    }
  );
  return t;
};

/**
 * Returns options which have been selected
 *
 * @name     selectedOptions
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @type     jQuery
 * @example  $("#myselect").selectedOptions();
 *
 */
$.fn.selectedOptions = function()
{
  return this.find("option:selected");
};

})(jQuery);