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Created March 18, 2020 15:18
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HTML form validation
Raw
index.html
<html>
<head>
<title>Html5 Form Validation</title>
<link rel="stylesheet" href="form.css" type="text/css"/>
<script type="text/javascript" src="form.js"></script>
<script type="text/javascript">
H5F.listen(window,"load",function () {
H5F.setup(document.getElementById("signup"));
},false);
</script>
</head>
<body>
<form id="signup">
<h1>HTML5 Form Validation</h1>
<h2>Fields marked (*) are required</h2>
<fieldset>
<legend>Input Text Field Validation</legend>
<ol>
<li>
<label for="firstname">First Name *</label>
<input type="text" id="firstname" name="firstname" placeholder="First Name" required />
</li>
<li>
<label for="lastname">Last Name *</label>
<input type="text" id="lastname" name="lastname" placeholder="Last Name" required />
</li>
</ol>
</fieldset>
<fieldset>
<legend>Email and URL Validation</legend>
<ol>
<li>
<label for="email">Email *</label>
<input type="email" id="email" name="email" placeholder="e.g. swapnil@example.com" title="Please enter a valid email" required />
<p class="validation01">
<span class="invalid">Please enter a valid email address e.g. swapnil@example.com</span>
<span class="valid">Your email address is now valid</span>
</p>
</li>
<li>
<label for="url">Website *</label>
<input type="url" name="url" id="url" placeholder="e.g. http://www.html5andcss3.org" title="Please enter a valid URL" required />
<p class="validation01">
<span class="invalid">Please enter a valid URL address e.g. http://www.html5andcss3.org</span>
<span class="valid">Your URL address is now valid</span>
</p>
</li>
</ol>
</fieldset>
<fieldset>
<legend>Mobile or Phone Number Validation</legend>
<ol>
<li>
<label for="tel">Mobile *</label>
<input type="tel" id="tel" name="tel" pattern="\d{10}" placeholder="Please enter a ten digit phone number" required />
<p class="validation01">
<span class="invalid">No spaces or brackets e.g. 9999999999</span>
<span class="valid">Your mobile number is valid</span>
</p>
</li>
</ol>
</fieldset>
<fieldset>
<legend>Drop Down Box Validation</legend>
<ol>
<li>
<label for="state">Country</label>
<select name="state" id="state">
<option>Africa</option>
<option>America</option>
<option>Australia</option>
<option>China</option>
<option>England</option>
<option>Japan</option>
<option selected>India</option>
<option>Indonesia</option>
</select>
</li>
</ol>
</fieldset>
<fieldset>
<legend>Number Validation With Specific Range</legend>
<ol>
<li>
<label for="postcode">Post code *</label>
<input id="postcode" name="postcode" type="number" min="10001" max="999999" maxlength="6" required />
<p class="validation01">
<span class="invalid">Your postcode is out of range between 10001 - 999999</span>
<span class="valid">Your postcode is in the correct range</span>
</p>
</li>
</ol>
</fieldset>
<fieldset>
<legend>Textarea Validation</legend>
<ol>
<li>
<label for="address">Address *</label>
<textarea id="address" name="address" type="text" required></textarea>
</li>
</ol>
</fieldset>
<fieldset>
<legend>CheckBox and Radio Button Validation</legend>
<ol>
<li>
<label for="username">Agree to T & C *</label>
<input id="checkbox" name="checkbox" type="checkbox" required />
</li>
<li>
<label for="username">General *</label>
<input id="radio" name="radio" type="radio" required />Male <input id="radio" name="radio" type="radio" required />Female
</li>
</ol>
</fieldset>
<fieldset>
<legend>Password Validation Using Pattern</legend>
<ol>
<li>
<label for="password">Password *</label>
<input id="password" name="password" type="password" title="Minimum 8 characters, one number, one uppercase and one lowercase letter" pattern="(?=^.{8,}$)((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*" required />
<p class="validation01">
<span class="invalid">Minimum 8 characters, one number, one uppercase letter and one lowercase letter</span>
<span class="valid">Your password meets our requirements, thank you.</span>
</p>
</li>
</ol>
</fieldset>
<input type="submit" value="Sign up" />
</form>
</body>
</html>
Raw
script.js
var H5F = H5F || {};
(function(d){
var field = d.createElement("input"),
emailPatt = new RegExp("([a-z0-9_.-]+)@([0-9a-z.-]+).([a-z.]{2,6})","i"),
urlPatt = new RegExp("^http:\/\/","i"),
usrPatt, curEvt, args;
H5F.setup = function(form,settings) {
var isCollection = !form.nodeType || false;
var opts = {
validClass : "valid",
invalidClass : "error",
requiredClass : "required"
};
if(typeof settings === "object") {
for (var i in opts) {
if(typeof settings[i] === "undefined") { settings[i] = opts[i]; }
}
}
args = settings || opts;
if(isCollection) {
for(var k=0,len=form.length;k<len;k++) {
H5F.validation(form[k]);
}
} else {
H5F.validation(form);
}
};
H5F.validation = function(form) {
var f = form.elements,
flen = f.length,
isRequired;
H5F.listen(form,"invalid",H5F.checkField,true);
H5F.listen(form,"blur",H5F.checkField,true);
H5F.listen(form,"input",H5F.checkField,true);
H5F.listen(form,"focus",H5F.checkField,true);
if(!H5F.support()) {
form.checkValidity = function(e,f) { H5F.checkValidity("",form); };
while(flen--) {
isRequired = !!(f[flen].attributes["required"]);
// Firefox includes fieldsets inside elements nodelist so we filter it out.
if(f[flen].nodeName !== "FIELDSET" && isRequired) {
H5F.validity(f[flen]); // Add validity object to field
}
}
}
};
H5F.validity = function(el) {
var elem = el,
missing = H5F.valueMissing(elem),
type = elem.getAttribute("type"),
pattern = elem.getAttribute("pattern"),
placeholder = elem.getAttribute("placeholder"),
isType = /^(email|url|password)$/i,
fType = ((isType.test(type)) ? type : ((pattern) ? pattern : false)),
patt = H5F.pattern(elem,fType),
step = H5F.range(elem,"step"),
min = H5F.range(elem,"min"),
max = H5F.range(elem,"max");
elem.validity = {
patternMismatch: patt,
rangeOverflow: max,
rangeUnderflow: min,
stepMismatch: step,
valid: (!missing && !patt && !step && !min && !max),
valueMissing: missing
};
if(placeholder && curEvt !== "input") { H5F.placeholder(elem); }
elem.checkValidity = function(e,el) { H5F.checkValidity(e,elem); };
};
H5F.checkField = function (e) {
var el = H5F.getTarget(e) || e, // checkValidity method passes element not event
events = /^(input|focusin|focus)$/i;
curEvt = e.type;
if(!H5F.support()) { H5F.validity(el); }
if(el.validity.valid) {
H5F.removeClass(el,args.invalidClass);
H5F.removeClass(el,args.requiredClass);
H5F.addClass(el,args.validClass);
} else if(!events.test(curEvt)) {
if(el.validity.valueMissing) {
H5F.removeClass(el,args.invalidClass);
H5F.removeClass(el,args.validClass);
H5F.addClass(el,args.requiredClass);
} else {
H5F.removeClass(el,args.validClass);
H5F.removeClass(el,args.requiredClass);
H5F.addClass(el,args.invalidClass);
}
} else if(el.validity.valueMissing) {
H5F.removeClass(el,args.requiredClass);
H5F.removeClass(el,args.invalidClass);
H5F.removeClass(el,args.validClass);
}
};
H5F.checkValidity = function (e,el) {
var f, ff, isRequired, invalid = false;
if(el.nodeName === "FORM") {
f = el.elements;
for(var i = 0,len = f.length;i < len;i++) {
ff = f[i];
isRequired = !!(ff.attributes["required"]);
if(ff.nodeName !== "FIELDSET" && isRequired) {
H5F.checkField(ff);
if(!ff.validity.valid && !invalid) {
ff.focus();
invalid = true;
}
}
}
} else {
H5F.checkField(el);
return el.validity.valid;
}
};
H5F.support = function() {
return (H5F.isHostMethod(field,"validity") && H5F.isHostMethod(field,"checkValidity"));
};
// Create helper methods to emulate attributes in older browsers
H5F.pattern = function(el, type) {
if(type === "email") {
return !emailPatt.test(el.value);
} else if(type === "url") {
return !urlPatt.test(el.value);
} else if(!type || type === "password") { // Password can't be evalutated.
return false;
} else {
usrPatt = new RegExp(type);
return !usrPatt.test(el.value);
}
};
H5F.placeholder = function(el) {
var placeholder = el.getAttribute("placeholder"),
focus = /^(focus|focusin)$/i,
node = /^(input|textarea)$/i,
isNative = !!("placeholder" in field);
if(!isNative && node.test(el.nodeName)) {
if(el.value === "") {
el.value = placeholder;
} else if(el.value === placeholder && focus.test(curEvt)) {
el.value = "";
}
}
};
H5F.range = function(el,type) {
// Emulate min, max and step
var min = parseInt(el.getAttribute("min"),10) || 0,
max = parseInt(el.getAttribute("max"),10) || false,
step = parseInt(el.getAttribute("step"),10) || 1,
val = parseInt(el.value,10),
mismatch = (val-min)%step;
if(!H5F.valueMissing(el) && !isNaN(val)) {
if(type === "step") {
return (el.getAttribute("step")) ? (mismatch !== 0) : false;
} else if(type === "min") {
return (el.getAttribute("min")) ? (val < min) : false;
} else if(type === "max") {
return (el.getAttribute("max")) ? (val > max) : false;
}
} else if(el.getAttribute("type") === "number") {
return true;
} else {
return false;
}
};
H5F.required = function(el) {
var required = !!(el.attributes["required"]);
return (required) ? H5F.valueMissing(el) : false;
};
H5F.valueMissing = function(el) {
var placeholder = el.getAttribute("placeholder");
return !!(el.value === "" || el.value === placeholder);
};
/* Util methods */
H5F.listen = function (node,type,fn,capture) {
if(H5F.isHostMethod(window,"addEventListener")) {
/* FF & Other Browsers */
node.addEventListener( type, fn, capture );
} else if(H5F.isHostMethod(window,"attachEvent") && typeof window.event !== "undefined") {
/* Internet Explorer way */
if(type === "blur") {
type = "focusout";
} else if(type === "focus") {
type = "focusin";
}
node.attachEvent( "on" + type, fn );
}
};
H5F.preventActions = function (evt) {
evt = evt || window.event;
if(evt.stopPropagation && evt.preventDefault) {
evt.stopPropagation();
evt.preventDefault();
} else {
evt.cancelBubble = true;
evt.returnValue = false;
}
};
H5F.getTarget = function (evt) {
evt = evt || window.event;
return evt.target || evt.srcElement;
};
H5F.addClass = function (e,c) {
var re;
if (!e.className) {
e.className = c;
}
else {
re = new RegExp('(^|\\s)' + c + '(\\s|$)');
if (!re.test(e.className)) { e.className += ' ' + c; }
}
};
H5F.removeClass = function (e,c) {
var re, m;
if (e.className) {
if (e.className == c) {
e.className = '';
}
else {
re = new RegExp('(^|\\s)' + c + '(\\s|$)');
m = e.className.match(re);
if (m && m.length == 3) { e.className = e.className.replace(re, (m[1] && m[2])?' ':''); }
}
}
};
H5F.isHostMethod = function(o, m) {
var t = typeof o[m], reFeaturedMethod = new RegExp('^function|object$', 'i');
return !!((reFeaturedMethod.test(t) && o[m]) || t == 'unknown');
};
})(document);
Raw
style.css
body, form, ul, li, p, h2, h3, h4, h5{margin: 0;padding: 0;}
body {background-color: #ffffff; color: #666; }
#signup img { border: none; }
#signup p{margin: 0 0 1em 0;}
#signup h2 { font-size: 14px; margin: 0 0 12px; }
#signup{margin: 20px auto;width: 500px;}
#signup fieldset{margin: 0 0 20px;padding: 20px;-webkit-border-radius: 5px;-moz-border-radius: 5px;border-radius: 5px;}
#signup ol{list-style-type: none;padding: 0;margin: 0;}
#signup li{margin: 0 0 12px;position: relative;}
#signup label{width: 150px;display: inline-block;vertical-align: top;}
legend{ color:#00C492;}
#signup fieldset input,#signup fieldset select{background: #fff url(ico_validation.png) 260px 24px no-repeat;display: inline-block;width: 250px;border: 1px solid #00C492;padding: 3px 26px 3px 3px;-moz-transition: background-color 1s ease;-webkit-transition: background-color 1s ease;-o-transition: background-color 1s ease;transition: background-color 1s ease;-webkit-border-radius: 5px;-moz-border-radius: 5px;border-radius: 5px;}
#signup fieldset textarea{display: inline-block;width: 250px;border: 1px solid #00C492;padding: 3px 26px 3px 3px;-moz-transition: background-color 1s ease;-webkit-transition: background-color 1s ease;-o-transition: background-color 1s ease;transition: background-color 1s ease;-webkit-border-radius: 5px;-moz-border-radius: 5px;border-radius: 5px; resize:none; }
#signup fieldset input[type="checkbox"]{width:20px;}
#signup fieldset input[type="radio"]{width:20px;}
#signup fieldset select{ width: 280px; padding: 3px; }
#signup fieldset #postcode{ padding: 3px; width: 270px; }
#signup input::-webkit-input-placeholder,#signup input:-moz-placeholder input:placeholder{color: #f2f2f2;}
#signup .validation01{background: #F08080;color: #fff;display: none;font-size: 12px;padding: 3px;position: absolute;right: -160px;text-align: center;top: 0;width: 150px;outline: 0;-moz-box-shadow: 0px 0px 4px #ffffff;-webkit-box-shadow: 0px 0px 4px #ffffff;box-shadow: 0px 0px 4px #ffffff;-webkit-border-radius: 5px;-moz-border-radius: 5px;border-radius: 5px;}
#signup input:focus + .validation01{ display: block; }
#signup input:focus:required:invalid + .validation01 .valid,#signup input.error:focus + .validation01 .valid,#signup input.required:focus + .validation01 .valid,#signup input:focus + .validation01 .valid{ display: none; }
#signup input:focus:required:valid + .validation01,#signup input.valid:focus + .validation01{ background: green; }
#signup input:focus:required:valid + .validation01 .invalid,#signup input.valid:focus + .validation01 .invalid{ display: none; }
#signup input:focus:required:valid + .validation01 .valid,#signup input.valid:focus + .validation01 .valid{ display: block; }
#signup fieldset input:required:valid{background-color: #fff;background-position: 260px -61px;}
#signup input.error{background-color: #F08080; background-position: 260px 3px;outline: none; }
#signup input.required{background-color: #fff; background-position: 260px -30px;}
#signup input.valid { background-color: #fff;background-position: 260px -61px;}
#signup input.error::-webkit-input-placeholder,#signup inputerror :-moz-placeholder {color: #f2f2f2;}
input[type="submit"]{background: #00C492; border:none; width:200px; margin:auto; float:right; padding:5px; border-radius:5px; color:#fff; font-weight:bold; cursor:pointer;}
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