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/* TODO


   - submit attrs on buttons
       - action / method / enctype / replace / target / novalidate
  - after_submit:
        - 204 NO CONTENT : leave doc, apply metadata
        - 205 RESET CONTENT : reset form
        - replace="document" (new page)
        - replace="values" (fill form with new tree)
        - relace element
        - others ?
        - "onreceive" event (response after submit)

  - check prototype.js serialize on multivalues
*/

GvaScript.Form = Class.create();

GvaScript.Form.Methods = {

  to_hash: function(form) {
    form = $(form);

    return form.serialize({hash:true});
  },

  to_tree: function(form) {
    form = $(form);

    return Hash.expand(GvaScript.Form.to_hash(form));
  },

  fill_from_tree : (function() {

    var doc = document; // local variable is faster than global 'document'

    // IMPLEMENTATION NOTE : Form.Element.setValue() is quite similar,
    // but our treatment of arrays is different, so we have to reimplement
    var _fill_from_value = function(form, elem, val, is_init) {

      // force val into an array
      if (!(val instanceof Array)) val = [val];


      var old_value = null; // needed for value:change custom event
      var new_value = null;

      switch (elem.type) {

        case "text" :
        case "textarea" :
        case "hidden" :
          old_value  = elem.value;
          elem.value = new_value = val.join(",");
        break;

        case "checkbox" :
        case "radio":
          var elem_val  = elem.value;
          old_value = elem.checked ? elem_val : null;

          // hand-crafted loop through val array (because val.include() is too slow)
          elem.checked = false;
          for (var count = val.length; count--;) {