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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Validate.js</title>
<link rel="shortcut icon" type="image/png" href="favicon.png">
<meta name="viewport" content="width=device-width, user-scalable=0, initial-scale=1, maximum-scale=1">
<link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.2/css/bootstrap.min.css">
<link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/highlight.js/7.4/styles/default.min.css">
<link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/highlight.js/7.4/styles/github.min.css">
<script src="http://cdnjs.cloudflare.com/ajax/libs/highlight.js/7.4/highlight.min.js"></script>
<script>hljs.initHighlightingOnLoad();</script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/bluebird/2.9.25/bluebird.min.js"></script>
<script src="https://cdn.jsdelivr.net/xdate/0.8/xdate.min.js"></script>
<script src="validate.js"></script>
<style>
html, body {
min-height: 100%;
height: 100%;
}
body {
font-weight: 200;
font-family: Helvetica, Arial, sans-serif;
}
h1, h2, h3 {
font-weight: 200;
}
#fork-me {
position: absolute;
right: 0;
top: 0;
-webkit-transform: translateZ(0);
}
header {
z-index: 10;
position: fixed;
top: 0;
left: 0;
width: 100%;
}
header .title {
font-size: 25px;
line-height: 50px;
border-bottom: none;
display: inline-block;
margin: 0;
padding: 0;
display: none;
}
#menu-button {
display: none;
width: 30px;
border: none;
background: none;
padding: 0;
margin: 15px 10px;
-webkit-transform: translateZ(0);
}
#menu-button .bar {
width: 100%;
height: 4px;
background-color: black;
border-radius: 1px;
margin-top: 4px;
}
#menu-button .bar:first-child {
margin-top: 0;
}
#sidebar {
background-color: #F7F5FA;
box-sizing: border-box;
padding-top: 10px;
padding-left: 10px;
overflow-y: scroll;
-webkit-overflow-scrolling: touch;
width: 299px;
border-right: 1px solid #eee;
position: fixed;
left: 0;
top: 0;
height: 100%;
min-height: 100%;
max-height: 100%;
}
#sidebar a {
color: #333;
text-shadow: 0 1px 0 #FFF;
}
#sidebar ul {
list-style: none;
margin: 0;
padding-left: 10px;
}
#sidebar > ul > li {
margin-bottom: 10px;
}
#sidebar > ul > li > a {
font-size: 16px;
font-weight: 400;
}
#sidebar ul ul li {
padding-left: 10px;
position: relative;
}
#sidebar ul ul li:after {
display: block;
content: '-';
position: absolute;
left: 0px;
top: 0;
}
#sidebar ul ul li.external:after {
content: "»";
}
#content {
margin-left: 299px;
-webkit-transform: translateZ(0);
}
#scroller {
position: relative;
}
#scroll-content {
max-width: 800px;
min-width: 640px;
padding: 0 30px 30px;
}
#scroll-content > div {
padding: 10px 0;
}
#scroll-content > div:first-child {
padding-top: 0;
}
#validate-js h2 {
margin-top: 20px;
}
.banner h1 {
font-size: 50px;
text-transform: uppercase;
border-bottom: 5px solid #333;
display: inline-block;
}
.download {
margin-top: 20px;
}
.download .btn {
width: 250px;
display: inline-block;
vertical-align: top;
}
.download .info {
display: inline-block;
font-size: 12px;
margin-left: 5px;
}
.download .badges a:hover {
text-decoration: none;
}
.dependencies {
margin-top: 20px;
}
h2 {
margin-top: 0;
}
.signature {
margin-bottom: 10px;
}
.signature b {
margin-right: 5px;
font-size: 18px;
}
pre > code {
padding: 0;
background-color: transparent;
}
.notes {
font-style: italic;
}
ul > li > code {
display: inline-block;
margin-bottom: 3px;
}
#validators > div, #utilities > div {
padding: 10px 0px;
}
#changelog h3 {
font-size: 14px;
}
#changelog h3 .version {
font-size: 18px;
}
@media (max-width: 768px) {
body {
padding-left: 0;
}
#fork-me {
display: none;
}
header {
background-color: white;
height: 50px;
border-bottom: 1px solid rgba(0, 0, 0, 0.1);
-webkit-box-shadow: 0px 2px black;
-moz-box-shadow: 0px 2px black;
box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.1);
}
header #menu-button, header .title {
display: inline-block;
}
.banner {
text-align: center;
}
.download {
text-align: center;
}
.download .btn {
width: 100%;
margin-bottom: 3px;
}
.banner h1 {
font-size: 40px;
margin-top: 0;
}
#sidebar {
left: -299px;
top: 50px;
padding-top: 10px;
z-index: 10;
-webkit-transition: left 250ms ease-in;
}
.sidebar-shown #sidebar {
left: 0;
-webkit-transition-timing-function: ease-out;
}
#content {
margin-top: 50px;
padding-top: 20px;
margin-left: 0;
overflow: hidden;
}
#scroll-content {
min-width: 0;
padding: 10px;
}
code {
white-space: normal;
}
pre {
overflow: scroll;
-webkit-overflow-scrolling: touch;
}
pre code {
min-width: 600px;
}
}
</style>
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
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})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-45797376-1', 'validatejs.org');
ga('require', 'displayfeatures');
ga('send', 'pageview');
</script>
</head>
<body>
<nav id="sidebar">
<ul>
<li>
<a href="#validate-js">Validate.js</a>
<ul>
<li class="external">
<a href="https://github.com/ansman/validate.js">GitHub Repository</a>
</li>
<li class="external">
<a href="docs/validate.html">Annotated source</a>
</li>
</ul>
</li>
<li><a href="#downloads">Downloads</a></li>
<li><a href="#installing">Installing</a></li>
<li><a href="#dependencies">Dependencies</a></li>
<li>
<a href="#overview">Overview</a>
<ul>
<li><a href="#supported-runtimes">Supported runtimes</a></li>
<li><a href="#examples">Examples</a></li>
<li><a href="#acknowledgements">Acknowledgements</a></li>
</ul>
</li>
<li><a href="#constraints">Constraints</a></li>
<li>
<a href="#validate">Validate function</a>
<ul>
<li><a href="#validate-async">Async validation</a></li>
<li><a href="#validate-single">Single value validation</a></li>
<li><a href="#validate-nested">Nested validation</a></li>
<li><a href="#validate-default-options">Default options</a></li>
</ul>
</li>
<li>
<a href="#custom-validator">Writing your own validator</a>
<ul>
<li><a href="#custom-validator-async">Writing an async validator</a></li>
</ul>
</li>
<li>
<a href="#validators">Validators</a>
<ul>
<li><a href="#validators-presence">Presence</a></li>
<li><a href="#validators-length">Length</a></li>
<li><a href="#validators-numericality">Numericality</a></li>
<li><a href="#validators-datetime">Datetime</a></li>
<li><a href="#validators-date">Date</a></li>
<li><a href="#validators-format">Format</a></li>
<li><a href="#validators-inclusion">Inclusion</a></li>
<li><a href="#validators-exclusion">Exclusion</a></li>
<li><a href="#validators-email">Email</a></li>
<li><a href="#validators-equality">Equality</a></li>
</ul>
</li>
<li>
<a href="#utilities">Utilities</a>
<ul>
<li><a href="#utilities-capitalize">capitalize</a></li>
<li><a href="#utilities-clean-attributes">cleanAttributes</a></li>
<li><a href="#utilities-collect-form-values">collectFormValues</a></li>
<li><a href="#utilities-contains">contains</a></li>
<li><a href="#utilities-extend">extend</a></li>
<li><a href="#utilities-format">format</a></li>
<li><a href="#utilities-get-deep-object-value">getDeepObjectValue</a></li>
<li><a href="#utilities-is-array">isArray</a></li>
<li><a href="#utilities-is-date">isDate</a></li>
<li><a href="#utilities-is-defined">isDefined</a></li>
<li><a href="#utilities-is-dom-element">isDomElement</a></li>
<li><a href="#utilities-is-empty">isEmpty</a></li>
<li><a href="#utilities-is-function">isFunction</a></li>
<li><a href="#utilities-is-integer">isInteger</a></li>
<li><a href="#utilities-is-number">isNumber</a></li>
<li><a href="#utilities-is-object">isObject</a></li>
<li><a href="#utilities-is-promise">isPromise</a></li>
<li><a href="#utilities-is-string">isString</a></li>
<li><a href="#utilities-prettify">prettify</a></li>
<li><a href="#utilities-result">result</a></li>
</ul>
</li>
<li>
<a href="#changelog">Changelog</a>
<ul>
<li><a href="#changelog-wip">WIP</a></li>
<li><a href="#changelog-0-7-1">0.7.1</a></li>
<li><a href="#changelog-0-7-0">0.7.0</a></li>
<li><a href="#changelog-0-6-1">0.6.1</a></li>
<li><a href="#changelog-0-6-0">0.6.0</a></li>
<li><a href="#changelog-0-5-0">0.5.0</a></li>
<li><a href="#changelog-0-4-0">0.4.0</a></li>
<li><a href="#changelog-0-3-2">0.3.2</a></li>
<li><a href="#changelog-0-3-1">0.3.1</a></li>
<li><a href="#changelog-0-3-0">0.3.0</a></li>
<li><a href="#changelog-0-2-0">0.2.0</a></li>
<li><a href="#changelog-0-1-3">0.1.3</a></li>
<li><a href="#changelog-0-1-2">0.1.2</a></li>
<li><a href="#changelog-0-1-1">0.1.1</a></li>
<li><a href="#changelog-0-1-0">0.1.0</a></li>
</ul>
</li>
</ul>
</nav>
<header>
<button id="menu-button">
<div class="bar"></div>
<div class="bar"></div>
<div class="bar"></div>
</button>
<div class="title">Validate.js</div>
</header>
<div id="content">
<div id="scroller">
<a id="fork-me" href="https://github.com/ansman/validate.js"><img src="https://raw.github.com/aral/fork-me-on-github-retina-ribbons/master/images-after-imageoptim/fork-me-right-grey@2x.png" alt="Fork me" width="149" height="149"></a>
<div id="scroll-content">
<div id="validate-js">
<div class="banner"><h1>Validate.js</h1></div>
<p>
Validate.js provides a declarative way of validating javascript objects.
</p>
<p>
The project can be found on <a href="https://github.com/ansman/validate.js">GitHub</a>
where you can also find our <a href="https://github.com/ansman/validate.js/issues">issue tracker</a>.
There is also a <a href="https://travis-ci.org/ansman/validate.js" target="_blank">Travis project</a>
used for testing,
a <a href="https://coveralls.io/r/ansman/validate.js" target="_blank">Coveralls project</a>
used to code coverage
as well as the <a href="docs/validate.html">annotated source</a>.
</p>
<p class="notes">
Validate.js is an open source component of <a href="https://www.wrapp.com">Wrapp</a>
and is licensed under <a href="LICENSE.txt">the MIT license</a>.
</p>
<h2 id="downloads">Downloads</h2>
<div class="download">
<a class="btn btn-default" download href="validate.js">Development version (0.7.1)</a>
<div class="info">
<span class="details">29KB, uncompressed and plenty of comments</span>
</div>
</div>
<div class="download">
<a class="btn btn-primary" download href="validate.min.js">Production version (0.7.1)</a>
<div class="info">
<span class="details">3.8KB, minified and gzipped</span><br>
<a download href="validate.min.map">(Source map)</a>
</div>
</div>
<div class="download">
<a class="btn btn-danger" download href="https://raw.github.com/ansman/validate.js/master/validate.js">Bleeding edge</a>
<div class="info badges">
<span class="details">Might not be 100% stable</span><br>
<a href="https://travis-ci.org/ansman/validate.js" target="_blank">
<img src="https://travis-ci.org/ansman/validate.js.svg?branch=master" alt="Build Status">
</a>
<a href="https://coveralls.io/r/ansman/validate.js" target="_blank">
<img src="https://coveralls.io/repos/ansman/validate.js/badge.svg?branch=master" alt="Coverage Status" />
</a>
</div>
</div>
<div id="installing">
<h2>Installing</h2>
<b>Browser/CDN</b>
<pre><code class="html"><script src="//cdnjs.cloudflare.com/ajax/libs/validate.js/0.7.1/validate.min.js"></script></code></pre>
<b>Require.js/AMD</b>
<pre><code class="javascript">require(["validate.js"], function(validate) {
// ...
});</code></pre>
<b>npm/node.js</b>
<pre><code class="bash">$ npm install --save validate.js</code></pre>
<pre><code class="javascript">var validate = require("validate.js");</code></pre>
<b>Bower</b>
<pre><code class="bash">$ bower install --save validate</code></pre>
<b>Component</b>
<pre><code class="bash">$ component install ansman/validate.js</code></pre>
</div>
<h2 id="dependencies">Dependencies</h2>
<p class="dependencies">
There are no required external dependencies but the default parser and
formatter for the datetime and date validator requires <a href="http://arshaw.com/xdate/">XDate</a> or
<a href="http://momentjs.com/">moment.js</a>.<br>
Validate.js will pick them up if they are in the global scope, otherwise
you can set <code>validate.moment</code> and <code>validate.XDate</code>
manually, for example like this if using a require based system:
</p>
<pre><code class="javascript">var validate = require("validate.js");
validate.moment = require("moment");</code></pre>
<p class="dependencies">
If you want to use async validation you need to use a runtime that
supports <a href="http://www.html5rocks.com/en/tutorials/es6/promises/" target="_blank">Promises</a>.<br>
You can tell validate.js to use any A+ compatible promise implemention
like this:
</p>
<pre><code class="javascript">// Simply set validate.Promise to be the promise constructor
// RSVP works
validate.Promise = RSVP.Promise;
// and Q.js too
validate.Promise = Q.Promise;</code></pre>
</div>
<div id="overview">
<h2>Overview</h2>
<p>
There are already many validation libraries out there today but most of them
are very tightly coupled to a language or framework.
</p>
<p>
The goal of validate.js is to provide a cross framework and cross language
way of validating data. The validation constraints can be declared in JSON
and shared between clients and the server.
</p>
<p>
<b>Important!</b>
One thing that is a bit unorthodox is that most validators will consider
empty values (<code>null</code>, <code>undefined</code>, whitespace
only strings etc) valid values. So for example adding a constraint of
at least 6 characters will be like saying <i>If the attribute is given
it must be at least 6 characters</i>.<br>
This differs from example Ruby on Rails where validators instead have
the <code>allow_nil</code> option. I find it quite common that you
want to have constraints on an optional attribute.<br>
</p>
<div id="supported-runtimes">
<h3>Supported runtimes</h3>
<p>
Validate.js works with any ECMAScript 5.1 runtime which means it works in
both the browser and in node.js
</p>
<p>All modern browsers are supported (IE9+, Firefox 3+, Opera 10.5+, Safari 4+, Chrome).</p>
</div>
<div id="examples">
<h3>Examples</h3>
<p>
You can find some basic examples <a href="examples.html">included in the project</a>.
</p>
<p>
They are meant to give a feeling for how to use the library and
should not be considered production ready code.
</p>
<p>
The native HTML form validate has been disabled in a demo purpose
so that you may see how validate.js works in action.
</p>
</div>
<div id="acknowledgements">
<h3>Acknowledgements</h3>
<ul>
<li>The design of these docs pages have been heavily inspired by <a href="http://backbonejs.org/">backbonejs.org</a>.</li>
<li>All the validators have been inspired by <a href="http://edgeguides.rubyonrails.org/active_record_validations.html">Rails' validators</a>.</li>
</ul>
</div>
</div>
<div id="constraints">
<h2>Constraints</h2>
<p class="description">The constraints have the following format</p>
<pre><code class="json">{
<attribute>: {
<validator name>: <validator options>
}
}</code></pre>
<p class="description">
Unless otherwise specified you can always specify the <b>message</b>
option to customize the message returned if the validator doesn't pass.
Just remember to not include the attribute name since it's automatically
prepended to the error message.
</p>
<p class="description">
Sometimes it's nice to be able validate field differently depending
on the input itself.
validate.js allows the validators object and validator options to be
a function that should return the constraints/options:
</p>
<pre><code class="javascript">var constraints = {
creditCardNumber: {
presence: true,
format: {
pattern: /^(34|37|4|5[1-5]).*$/,
message: "must be a valid Amex, Visa or Mastercard number"
},
length: function(value, attributes, attributeName, options, constraints) {
if (value) {
// Amex
if ((/^(34|37).*$/).test(value)) return {is: 15};
// Visa, Mastercard
if ((/^(4|5[1-5]).*$/).test(value)) return {is: 16};
}
// Unknown card, don't validate length
return false;
}
},
creditCardZip: function(value, attributes, attributeName, options, constraints) {
if (!(/^(34|37).*$/).test(attributes.creditCardNumber)) return null;
return {
presence: true,
length: {is: 5}
};
}
};
validate({creditCardNumber: "4"}, constraints);
// => {"creditCardNumber": ["Credit card number is the wrong length (should be 16 characters)"]}
validate({creditCardNumber: "4242424242424242"}, constraints);
// => undefined
validate({creditCardNumber: "340000000000000"}, constraints);
// => {"creditCardZip": ["Credit card zip can't be blank"]}</code></pre>
<p class="description">
If you don't want to give any options to a validator you may pass
<code>true</code> instead of an empty object. The validator will not
be run if the options are falsy.
</p>
<p class="notes">
<b>Important!</b> Most validators consider empty values (<code>null</code>, <code>undefined</code>, whitespace
only strings etc) valid values so make sure you use the
<code>presence</code> validator on attributes that are required.
</p>
</div>
<div id="validate">
<h2>Validate function</h2>
<div class="signature">
<b>validate</b>
<code>validate(attributes, constraints, [options])</code>
</div>
<p class="description">
Validates the <b>attributes</b> object against the <b>constraints</b>.<br>
The <b>attributes</b> must be a plain object or a form element,
things like backbone models etc are not supported.<br>
For the format of the <b>constraints</b> see the <a href="#constraints">constraints section</a>.
</p>
<p class="description">
If the <b>attributes</b> objects is an HTML/DOM element
<a href="#utilities-collect-form-values"><code>collectFormValues</code></a>
is called before validating.
</p>
<p class="description">
If there are no errors nothing is returned. Otherwise an object in this
format is returned: <code>{<attribute>: [<error>, <error>, ...]}</code>
</p>
<p class="description">
Since validators don't include the argument name in the error message
the validate function prepends it for them. This behaviour can be
disabled by setting the <b>fullMessages</b> option to <code>false</code>.
</p>
<p class="description">
If you need an error not to be prefixed by the attribute add a leading
<code>^</code> to the error and it won't be prepended. If you need to
have a leading <code>^</code> but want the prefixing just write <code>\^</code>.
</p>
<p class="description">
If you include <code>%{value}</code> in the error message it will be
replaced with the actual value. The value is transformed using
<code>validate.stringifyValue</code> (which per default just calls
<code>validate.prettify</code>) but it can be overidden to customize
the formatting.
</p>
<p class="description">
If you want to customize how the attribute names are prettified you
can just override the <code>validate.prettify</code> to your liking.
</p>
<p class="description">
There is also a <b>format</b> option which accepts the following
values:
</p>
<ul>
<li><code>"grouped"</code> (default) - Returns error messages grouped by attribute.</li>
<li><code>"flat"</code> - Returns a flat list of error messages.</li>
<li><code>"detailed"</code> - Returns a list of error objects containing more info on the error (see example). Each object will only contain a single message.</li>
</ul>
<pre><code class="javascript">var constraints = {
username: {
presence: true,
exclusion: {
within: ["nicklas"],
message: "'%{value}' is not allowed"
}
},
password: {
presence: true,
length: {
minimum: 6,
message: "must be at least 6 characters"
}
}
};
validate({password: "bad"}, constraints);
// => {
// "username": ["Username can't be blank"],
// "password": ["Password must be at least 6 characters"]
// }
validate({username: "nick", password: "better"}, constraints);
// => undefined
validate({username: "nicklas", password: "better"}, constraints);
// => {"username": ["Username 'nicklas' is not allowed"]}
validate({password: "better"}, constraints, {fullMessages: false})
// => {"username": ["can't be blank"]}
validate({}, constraints, {format: "flat"})
// => ["Username can't be blank", "Password can't be blank"]
validate({username: "nicklas", password: "bad"}, constraints, {format: "detailed"})
// => [{
// attribute: "password",
// error: "Password must be at least 6 characters",
// options: {
// minimum: 6,
// message: "must be at least 6 characters"
// },
// validator: "length",
// value: "bad"
// }]
validate({}, {username: {presence: {message: "^You must pick a username"}}});
// => {"username": ["You must pick a username"]}</code></pre>
<div id="validate-async">
<h3>Async validation</h3>
<div class="signature">
<b>validate.async</b>
<code>validate.async(attributes, constraints, [options])</code>
</div>
<p class="description">
Even though none of the built in validators are async it is sometimes
useful to have async validations. One example would be to check if
a username is already used by asking the server.
</p>
<p class="description">
Validate.js supports async validations through the <code>validate.async</code>
function. It has the same signature as the regular validation function.
</p>
<p class="description">
<code>validate.async</code> returns a
<a href="http://www.html5rocks.com/en/tutorials/es6/promises/" target="_blank">Promise</a>
that is resolved if the validation passes and is rejected if the
validation failed, passing the errors as the first argument.<br>
The errors has the same format as the errors from the regular validation function.
</p>
<p class="description">
Besides accepting all options as the non async validation function
it also accepts two additional options; <b>cleanAttributes</b> which,
unless <code>false</code>, makes <code>validate.async</code>
call <a href="#utilities-clean-attributes"><code>validate.cleanAttributes</code></a>
before resolving the promise and <b>wrapErrors</b> which can be
a function or constructor that will be called with the errors,
options, attributes and constraints if an error occurs. This allows
you to define a better way of catching validation errors.
</p>
<p class="description">
If an <code>Error</code> is thrown from an async validator the
argument passed to the rejection handler will be that error. This
allows you to differentiate from coding errors and validation errors.
</p>
<p class="description">
You can use the async validate function even if no validations
are async, it still returns a promise. You can not, however, use
the regular function with async validations.
</p>
<p class="description">
Any A+ type promise can be used, just override <code>validate.Promise</code>
with the constructor of the new Promise implementation.
</p>
<p class="description">
Validate.js will try to use the global Promise function if it exists
otherwise it will throw an exception when using <code>validate.async</code>
</p>
<p class="notes">
Please note that jQuery's promise implementation is not A+
compatible and will not work.
</p>
<p class="description">Example:</p>
<pre><code class="javascript">function success(attributes) {
console.log("Success!", attributes);
}
function error(errors) {
if (errors instanceof Error) {
// This means an exception was thrown from a validator
console.err("An error ocurred", errors);
} else {
console.log("Validation errors", errors);
}
}
var constraints = {
name: {
presence: true
},
// This is so the country doesn't get removed when cleaning the attributes
country: {}
};
var attributes = {
name: "Nicklas",
country: "Sweden",
someMaliciousAttribute: "scary value"
};
// Will call the success function and log {
// name: "Nicklas",
// country: "Sweden"
// }
validate.async(attributes, constraints).then(success, error);
// Will call the error function
validate.async({}, constraints).then(success, error);
function ValidationErrors(errors, options, attributes, constraints) {
Error.captureStackTrace(this, this.constructor);
this.errors = errors;
this.options = options;
this.attributes = attributes;
this.constraints = constraints;
}
ValidationErrors.prototype = new Error();
// This isn't supported by the ES6 promises
validate.async({}, constraints, {wrapErrors: ValidationErrors})
.then(success)
.catch(ValidationErrors, function(error) {
// Handle the validation errors
console.log("ValidationErrors", error);
})
.catch(function(error) {
// Handle other errors;
console.log("SystemError", error);
});
// Supporting another promise implementation (RSVP in this case)
validate.Promise = RSVP.Promise;</code></pre>
</div>
<div id="validate-single">
<h3>Single value validation</h3>
<div class="signature">
<b>validate.single</b>
<code>validate.single(value, constraints, [options])</code>
</div>
<p class="description">
Sometimes you only want to validate a single value against some
constraints and using the normal validate function is quite
verbose so there is a shorthand for this.
</p>
<p class="description">
It does little more than proxying the call do the main validation
function but with the value wrapped in an object and the options
<b>fullMessages</b> and <b>format</b> set to <code>"flat"</code>.
This is because there is no name which means it can't produce
full messages.
</p>
<p class="description">
You can use the provided <a href="#utilities-format">format</a>,
<a href="#utilities-capitalize">capitalize</a> and
<a href="#utilities-prettify">prettify</a>
utility functions to append your own name.
</p>
<pre><code class="javascript">validate.single(null, {presence: true, email: true});
// => ["can't be blank"]
validate.single("foo", {presence: true, email: true});
// => ["is not a valid email"]
validate.single("foo@bar.com", {presence: true, email: true});
// => undefined</code></pre>
</div>
<div id="validate-nested">
<h3>Nested validation</h3>
<p class="description">
Validate.js also has limited support for nested objects (objects
within objects) using the dot notation.
</p>
<p class="description">
The implementation is fairly basic and doesn't do anything clever
with the messages. It doesn't support things like only validating a
sub key if the parent key is present so for more advanced validations
multiple validation schemas are recommended.
</p>
<pre><code class="javascript">var constraints = {
"addresses.shipping": {
presence: true
},
"addresses.shipping.street": {
format: {
// Must be numbers followed by a name
pattern: "^[0-9]+ .+$",
message: "^The street for the shipping address must be a valid street name"
}
}
};
validate({}, constraints);
// => {"addresses.shipping": ["Addresses shipping can't be blank"]}
validate({addresses: {shipping: {street: "Foobar"}}}, constraints);
// => {"addresses.shipping.street": ["The street for the shipping address must be a valid street name"]}
validate({"foo.bar": 3}, {"foo\\.bar": {numericality: {even: true}}});
// => {"foo\.bar": ["Foo bar must be even"]}</code></pre>
</div>
<div id="validate-default-options">
<h3>Default options</h3>
<p class="description">
Both the <code>validate</code>, <code>validate.async</code> as well
as all validators support specifying default options by setting
the <code>options</code> property on the respective function or
validator.
</p>
<p class="description">
Most validators allow you to specify default messages in addition
to default options, refer to the documentation for the individual
validators for information on how to do this.
</p>
<pre><code class="javascript">var constraints = {
name: {
presence: true
}
};
validate.options = {format: "flat"};
validate.async.options = {format: "flat", cleanAttributes: false};
validate.validators.presence.options = {message: "can't be empty"};
// The default options will be used for both the
// validator and the validate function
validate({}, constraints);
// => ["Name can't be empty"]
// The default options are not used if the constraints options are falsy
validate({format: "grouped"}, {});
// => undefined</code></pre>
</div>
</div>
<div id="custom-validator">
<h2>Writing your own validator</h2>
<p class="description">
Writing your own validator is super simple! Just add it to the
<code>validate.validators</code> object and it will be automatically
picked up.
</p>
<p class="description">
The validator receives the following arguments:
</p>
<ol>
<li><b>value</b> - The value exactly how it looks in the attribute object.</li>
<li>
<b>options</b> - The options for the validator. Guaranteed to not
be <code>null</code> or <code>undefined</code>.
</li>
<li>
<b>key</b> - The attribute name.
</li>
<li>
<b>attributes</b> - The entire attributes object.
</li>
</ol>
<p class="description">
If the validator passes simply return <code>null</code> or <code>undefined</code>.
Otherwise return a string or an array of strings containing the
error message(s).<br>
Make sure not to append the key name, this will be done automatically.
</p>
<pre><code class="javascript">validate.validators.custom = function(value, options, key, attributes) {
console.log(value);
console.log(options);
console.log(key);
console.log(attributes);
return "is totally wrong";
};
// Will log:
// - "some value"
// - "some options"
// - "foo"
// - {"foo": "some value"}
validate({foo: "some value"}, {foo: {custom: "some options"}});
// => {foo: ["Foo is totally wrong"]}</code></pre>
<div id="custom-validator-async">
<h3>Writing an async validator</h3>
<p class="description">
Async validators are equal to a regular one in every way except