/*
 * verify.js
 *
 * Chris Farris <chris@room17.com>
 * v0.1 
 *
 * Javascript application to verify form inputs prior to submission to
 * the server.
 * There is only support text,textarea and password fields.
 *
 * Revision History:
 * v0.1 8/8/00 JCF
 *	Inital creation
 *
 * Copyright (C) 2000 Chris Farris
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * This code adapted from the book _JavaScript: The Definitive Guide_.
 * Written by David Flanagan.  Copyright (c) 1996 O'Reilly & Associates. 
 * This example is provided WITHOUT WARRANTY either expressed or implied.
 * You may study, use, modify, and distribute it for any purpose.
 */

// A function to find whitespace in a string.
function isblank(s) {
  for(var i = 0; i < s.length; i++) {
    var c = s.charAt(i);
      if ((c != ' ') && (c != '\n') && (c != '\t')) return false;
  }
  return true;
}

/* verify(form)
 *
 * Passed a form object this will return true or false if the 
 * input vars pass the expectations defined in the form object.
 */
function verify(f) {
  var msg;
  var empty_fields = "";
  var errors = "";

  // Define our Regexps
  var REmail=/^\S+\@[\w-]+\.[\w\.-]+$/;
  var RPhone=/^[0-9+.() -]*$/;
  var RSSN=/^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$/;
  var RTxt=/^[A-Za-z-+. ']*$/;
  var RAddr=/^[0-9A-Za-z+. ,'\-\/\:]*$/;
//  var RDate=/^[0-9]+[\/ -][0-9]+[\/ -][0-9]+++$/;

  // Loop through each element in the form.
  for(var i = 0; i < f.length; i++) {
    var e = f.elements[i];

//    if (((e.type == "text") || (e.type == "textarea")) && e.required) 

    // We only support text,textarea and password fields right now.
    if ((e.type == "text") || (e.type == "textarea") 
		|| (e.type == "password")) {

      // Do required Check
      if (e.required && 
		((e.value == null) || (e.value == "") || isblank(e.value))) {
        empty_fields += "\n          " + e.verbal;
        continue;
      }

      // Now check for fields that are supposed to be numeric.
      if ((e.want_num) && ! isblank(e.value)) { 
        var v = parseFloat(e.value);
          if (isNaN(v) ) {
            errors += "- The field " + e.verbal + " must be a number";
            errors += ".\n";
          } // endif
      } // endif

      // Email Check
      if (e.want_email) {
        if (e.value != "" && !e.value.match(REmail)) {
          errors += "- The field " + e.verbal + " is not a valid email address.\n";
        } // endif
      } // end if want_email

      // SSN Check
      if (e.want_ssn) {
        if (e.value != "" && !e.value.match(RSSN)) {
          errors += "- The field " + e.verbal + " is not a valid social security number.\n";
        } // endif
      } // end if want_ssn

      // Phone Number Check
      if (e.want_phone) {
        if (e.value != "" && !e.value.match(RPhone)) {
          errors += "- The field " + e.verbal + " is not a valid phone number.\n";
        } // endif
      } // end if want_phone

      // Date Check
      if (e.want_date) {
        if (e.value != "" && !e.value.match(RDate)) {
          errors += "- The field " + e.verbal + " is not a valid date. \n";
        } // endif
      } // end if want_date

      // Text Check
      if (e.want_txt) {
        if (e.value != "" && !e.value.match(RTxt)) {
          errors += "- The field " + e.verbal + " does not contain valid characters.\n";
        } // endif
      } // end if want_txt

      // Addr Check
      if (e.want_addr) {
        if (e.value != "" && !e.value.match(RAddr)) {
          errors += "- The field " + e.verbal + " does not contain valid characters.\n";
        } // endif
      } // end if want_addr

    } // endif required.
  } // end for

  if (!empty_fields && !errors) return true;

  msg  = "______________________________________________________\n\n"
  msg += "Your request was not submitted because of the following error(s).\n";
  msg += "Please correct these error(s) and re-submit.\n";
  msg += "______________________________________________________\n\n"

  if (empty_fields) {
    msg += "- The following required field(s) are empty:" 
                + empty_fields + "\n";
      if (errors) msg += "\n";
  }
  msg += errors;
  alert(msg);
  return false;
} // end verify()