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Home /
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javascript
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jkm4
Source code
Source code
err = 0; errc = ['OK']; errc[1] = 'Please verify the zip code (5 or 9 digits).'; errc[2] = 'Please enter the telephone number, including area code.'; errc[3] = 'Please check the expiration date: four digits, ' + 'e.g., 0709 is the correct date for July, 2009.'; errc[4] = 'This card is not working; can you check the card number again?'; errc[5] = 'Please do not leave this field blank.'; errc[6] = 'Please fill in the email address.'; errc[7] = 'Please check the expiration date: apparently it is expired.'; errc[8] = 'Please check the expiration date: it is not valid.'; errc[9] = 'Please complete the entry.'; errc[10] = 'Please enter a numerical value (may include an exponent e+N).'; errc[11] = 'Please enter a complete URL.'; function nwts(s) { // no white space return s.replace(/\s+/g, ''); } function trimwts(s) { // trim white space return s.replace(/^\s+|\s+$/g, ''); } function number(s) { // any number, including exponent s = nwts(s)-0; err = isNaN(s) ? 10 : 0; return [err ? 0 : s]; } function zip(s) { // zip code var a = nwts(s).match(/\d{5}(-?\d{4}){0,1}/g); err = a != null && a.length ? 0 : 1; return a; } function tel(s) { // telephone, with area code + opt prefixes var a = s.replace(/\D+/g, '-'); a = a.match(/(\d+-?)*(\d{3}-?){2}\d{4}/g); err = a != null && a.length ? 0 : 2; return a; } /* this code is copied from https://www.codelib.net/home/jkm/checksum.js */ function checksum(s) { // thanks to daniel amor for AMEX specs var p=0, e=8, t=0, c=[], r=0, l=0, i; if (s.length != 16) { t = 1; e = s.length == 13 && 6 || s.length == 15 && 7; } for (i=p; i<e; i++) r += (c[i] = s.charAt(i*2+t) * 2) > 9 ? Math.floor(c[i]/10 + c[i]%10) : c[i]; for (i=p; i<e+t; i++) l += s.charAt(i*2+1-t)-0; l += r; return e && l%10 == 0; } function cardno(s) { s = s.replace(/\D+/g, ''); err = checksum(s) ? 0 : 4; return [s]; } function text(s) { s = trimwts(s); err = s.length ? 0 : 5; return [s]; } function words(s) { s = trimwts(s); err = /\s/.test(s) ? 0 : 9; return [s]; } function email(s) { a = s.match(/\S+@([-\w]+\.)+\w+/g); err = a != null && a.length ? 0 : 6; return a; } function url(s) { a = s.match(/\w{2,}:\/{2}([-\w]+\.)+\w+\S*/g); err = a != null && a.length ? 0 : 11; return a; } function expires(s) { s = nwts(s); var m = new Date() var m_year = m.getFullYear()%100, m_month = m.getMonth(); if (s.length != 4 || isNaN(s)) err = 3; else { s_month = s.substring(0,2)-0; s_year = s.substring(2, 4)-0; if (m_year > 70 && s_year < 30) s_year += 100; /* "Let your great grandson worry about that." */ if (s_year < m_year || s_year > m_year + 7) err = 8; else if (s_year == m_year && !(s_month > m_month)) err = 7; else err = 0; } return [s]; } function valid(element, check) { if (element.type == 'text' || element.type == 'textarea') { return check(element.value); } else return check(element); } present_element = null, present_error = null; function validate(form, list) { for (i=0; i<form.elements.length; i++) { var element = form.elements[i]; var n = element.name, out; if (list[n] && list[n].verify) { out = valid(element, list[n].verify); if (err && (list[n].force || list[n].err != err)) { list[n].err = err; present_error = err; present_element = element; alert(list[n].message || errc[err]); element.focus(); return false; } else if (!err && list[n].filter) element.value = out.join(', '); } } return true; }
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