

<!--
/*
 *
 * Copyright (c) 2006/2007 Sam Collett (http://www.texotela.co.uk)
 * Licensed under the MIT License:
 * http://www.opensource.org/licenses/mit-license.php
 *
 * Version 2.2
 * Demo: http://www.texotela.co.uk/code/jquery/select/
 *
 * $LastChangedDate$
 * $Rev$
 *
 */
 
(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
 *
 */
$.fn.removeOption = function()
{
 var a = arguments;
 if(a.length == 0) return this;
 var ta = typeof(a[0]);
 var v, i;
 // has to be a string or regular expression (object in IE, function in Firefox)
 if(ta == "string" || ta == "object" || ta == "function" ) v = a[0];
 else if(ta == "number") i = 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
   {
    if(remove && a[1] === true) remove = o[i].selected;
    if(remove)
    {
     this.remove(i);
    }
   }
  }
 );
 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)
{
 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;
   }
  }
 );
 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 value  Which options should be selected
 * can be a string or regular expression
 * @param    Boolean clear  Clear existing selected options, default false
 * @example  $("#myselect").selectOptions("val1"); // with the value 'val1'
 * @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);
 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]);
     }
    }
    else
    {
     if (o[i].value == v)
     {
      found = true;
      if(fT == "function") fn.call(o[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.find("option:selected").each(
  function()
  {
   v[v.length] = this.value;
  }
 );
 return v;
};
})(jQuery);
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