/**
 * @requires jquery.validate.js
 * @author zhanghuihua@msn.com
 */
(function($){
  if ($.validator) {
    $.validator.addmethod("alphanumeric", function(value, element) {
      return this.optional(element) || /^\w+$/i.test(value);
    }, "letters, numbers or underscores only please");
    
    $.validator.addmethod("lettersonly", function(value, element) {
      return this.optional(element) || /^[a-z]+$/i.test(value);
    }, "letters only please"); 
    
    $.validator.addmethod("phone", function(value, element) {
      return this.optional(element) || /^[0-9 \(\)-]{7,30}$/.test(value); // by lz 增加减号
    }, "please specify a valid phone number");
    
    $.validator.addmethod("postcode", function(value, element) {
      return this.optional(element) || /^[0-9 a-za-z]{5,20}$/.test(value);
    }, "please specify a valid postcode");
    
    $.validator.addmethod("date", function(value, element, params) {
      //value = value.replace(/\s+/g, "");
      value = value.trim(); // by lz
      if (string.prototype.parsedate){
        var $input = $(element);
        var pattern = $input.attr('datefmt') || 'yyyy-mm-dd';
        //return !$input.val() || $input.val().parsedate(pattern);
        return this.optional(element) || ((value.length==pattern.length) && value.parsedate(pattern)); // by lz
      } else {
        return this.optional(element) || value.match(/^\d{4}[\/-]\d{1,2}[\/-]\d{1,2}$/);
      }
    }, "please enter a valid date.");
    
    /*自定义js函数验证
     * <input type="text" name="xxx" customvalid="xxxfn(element)" title="xxx" />
     */
    $.validator.addmethod("customvalid", function(value, element, params) {
      try{
        return eval('(' + params + ')');
      }catch(e){
        return false;
      }
    }, "please fix this field.");
    
    $.validator.addclassrules({
      date: {date: true},
      alphanumeric: { alphanumeric: true },
      lettersonly: { lettersonly: true },
      phone: { phone: true },
      postcode: {postcode: true}
    });
    $.validator.setdefaults({errorelement:"span"});
    $.validator.autocreateranges = true;
    
  }

})(jquery);