Ketchup is a small (3.4KB minified & gzipped) jQuery Plugin that helps you to validate your forms. Out of the box it has 18 basic validations and a bubble like style. But truly this Plugin wants to be hacked to fit your needs. Easily write your own validations and overwrite/extend the default behaviour. Bubbles are not for everyone...
If you like the style of the bubbles and all validations you need are already included you can get this Plugin up and running like so:
Include the default stylesheet (located in ./css/ in this package) and the bundled and minified Plugin
along with the latest jQuery version in your HTML header.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Yammie</title>
<link rel="stylesheet" type="text/css" media="screen" href="css/jquery.ketchup.css" />
<script type="text/javascript" src="js/jquery-1.4.4.min.js"></script>
<script type="text/javascript" src="js/jquery.ketchup.all.min.js"></script>
</head>
<body>
... form stuff ...
By default Ketchup checks the data-validate attribute of form fields if it can find matching
validations. The default indicator for validations is validate(), all validations
go in there and are separated by comma. Validations can have arguments, also separated by comma.
About checkboxes: You only need to declare the validations on one checkbox. Ketchup binds all other
checkboxes with the same name automatically.
<form id="default-behavior" action="index.html">
<ul>
<li>
<label for="db-mail">E-Mail</label>
<input type="text" id="db-mail" data-validate="validate(required, email)" />
</li>
<li>
<label for="db-username">Username</label>
<input type="text" id="db-username" data-validate="validate(required, username, minlength(3))" />
</li>
<li>
<label for="db-skill">Skills</label>
<input type="checkbox" id="db-skill" name="db-skill" data-validate="validate(minselect(2))" /> jQuery
<input type="checkbox" name="db-skill" /> HTML
<input type="checkbox" name="db-skill" /> CSS
<input type="checkbox" name="db-skill" /> Rails
</li>
<li>
<input type="submit" value="Is Tasty?" />
</li>
</ul>
</form>
Just call ketchup() on your form, voilà.
$('#default-behavior').ketchup();
In last version Ketchup checked the class attribute for validations... which was not everyones taste
because class should be used for defining CSS classes. In HTML5 we have the data- attributes for the rescue
to set custom data.
However, if you still want to separate the validations declarations from your markup you can do so by passing an object with jQuery selectors as keys and validations as values to Ketchup.
Note that required is not a validation declaration but an actual class name. We use that to
select the fields to validate.
<form id="fields-in-call" action="index.html">
<ul>
<li>
<label for="fic-email">E-Mail</label>
<input type="text" id="fic-email" class="required" />
</li>
<li>
<label for="fic-username">Username</label>
<input type="text" id="fic-username" class="required" />
</li>
<li>
<input type="submit" value="Is Tasty?" />
</li>
</ul>
</form>
Right after the options (empty here {}) we pass in an object. Use the key to declare the jQuery
selector on which fields the validations in the value are processed.
Validations declared like this don't need the validate() indicator.
$('#fields-in-call').ketchup({}, {
'.required' : 'required', //all fields in the form with the class 'required'
'#fic-username': 'username, minlength(3)' //one field in the form with the id 'fic-username'
});
By default Ketchup listens to the blur event on form fields. You can overwrite that behaviour
for every field in the options, and you can overwrite it separately for a single field.
In the data-validate attribute you can have a on() indicator. Events go in there and are separated by a space. These
are strings jQuery's bind() accepts.
<form id="validation-events" action="index.html">
<ul>
<li>
<label for="ve-username">Username</label>
<input type="text" id="ve-username" data-validate="validate(required, minlength(3)) on(keyup focus)" />
</li>
<li>
<input type="submit" value="Is Tasty?" />
</li>
</ul>
</form>
$('#validation-events').ketchup({
validateEvents: 'dblclick'
});
/*if you set the fields to validate in the call
you simply pass in a array as value. First
argument is the validations string and the
second is the events string. Like so:
$('#validation-events').ketchup({}, {
'#ve-username': ['required, minlength(3)', 'keyup focus']
});*/
required - The field is required.minlength(min) - The field must have a minimal length of min characters.maxlength(max) - The field must have a maximal length of max characters.rangelength(min, max) - The field must have a length between min and max characters.min(min) - The field must have a minimal number of min.max(max) - The field must have a maximal number of max.range(min, max) - The field must have a number between min and max.number - The field must be a number.digits - The field must be a digit (full number).email - The field must be a valid email.url - The field must be a valid URL.username - The field must be a valid username.match(word) - The field must match the value word.contain(word) - The field must contain word.date - The field must be a valid date.minselect(min) - At least min checkboxes with the same name must be selected.maxselect(max) - No more than max checkboxes with the same name must be selected.rangeselect(min, max) - Between min and max checkboxes with the same name must be selected.You can write your own validation functions for Ketchup. A validation function must return a
boolean, true if the field validates fine and false if it fails to validate.
Validations pass in at least three arguments:
form - the jQuery object for the form (we validate in this form)el - the jQuery object for the form field (we validate on this field)value - the value of the form field (short for el.val())After these three arguments you can declare the arguments for your validation. In this example the
word validation has two arguments, word1 and word2. You pass in the arguments in your validation call like
word(ketchup, mustard). Now 'ketchup' is the word1 argument and so on.
Validation messages have {argN} placeholders for your arguments. Is {arg1} would become Is ketchup.
A validation can have a initial callback, optionally passed in as function as the second argument. Use this to bind
elements with the same name, checkboxes for example. Or apply a class to the field to style Ketchup enabled fields.
The initial callback passes in two arguments, form and el. You already know what these are.
<form id="own-validation" action="index.html">
<ul>
<li>
<label for="ov-word">Ketchup or Mustard</label>
<input type="text" id="ov-word" data-validate="validate(word(ketchup, mustard))" />
</li>
<li>
<input type="submit" value="Is Tasty?" />
</li>
</ul>
</form>
$.ketchup.validation('word', 'Either "{arg1}" or "{arg2}"', function(form, el, value, word1, word2) {
if(value == word1 || value == word2) {
return true;
} else {
return false;
}
}, function(form, el) {
//initial callback, this is optional
});
$('#own-validation').ketchup();
Helpers are repeating functions you can use in your validations via this.
isNumber(value) - Check if the value is a valid number. Returns true/false.contains(value, word) - Check if the value contains word. Returns true/false.isEmail(value) - Check if the value is a valid email. Returns true/false.isUrl(value) - Check if the value is a valid URL. Returns true/false.isUsername(value) - Check if the value is a valid username. Returns true/false.isDate(value) - Check if the value is a valid date. Returns true/false.inputsWithName(form, el) - Get all elements in the form with the name of el. Returns a jQuery object.inputsWithNameNotSelf(form, el) - Get all elements in the form with the name of el but not itself. Returns a jQuery object.getKetchupEvents(el) - Get all events Ketchup has used on the el. Returns a String.bindBrothers(form, el) - Bind all elements in the form with el's name to el's Ketchup events. This is helpful on checkboxes and co. Returns undefined.<form id="validation-helper" action="index.html">
<ul>
<li>
<label for="vh-email">Your E-Mail (must contain 'ketchup')</label>
<input type="text" id="vh-email" data-validate="validate(ketchupEmail)" />
</li>
<li>
<input type="submit" value="Is Tasty?" />
</li>
</ul>
</form>
$.ketchup.validation('ketchupEmail', 'Must be a valid e-mail and contain "ketchup"', function(form, el, value) {
if(this.isEmail(value) && this.contains(value.toLowerCase(), 'ketchup')) {
return true;
} else {
return false;
}
});
$('#validation-helper').ketchup();
Of course you can extend helpers too. Pass a helper name and the actual helper function with the arguments
to helper().
<form id="own-helper" action="index.html">
<ul>
<li>
<label for="oh-rand1">This field is validated randomly</label>
<input type="text" id="oh-rand1" data-validate="validate(random)" />
</li>
<li>
<label for="oh-rand2">Words are validated randomly: ketchup, mustard</label>
<input type="text" id="oh-rand2" data-validate="validate(randomWord(ketchup, mustard))" />
</li>
<li>
<input type="submit" value="Is Tasty?" />
</li>
</ul>
</form>
$.ketchup.helper('randomNumber', function(min, max) {
return (min + parseInt(Math.random() * (max - min + 1)));
});
$.ketchup.validation('random', 'Not this time...', function(form, el, value) {
return (this.randomNumber(0, 1) ? true : false);
});
$.ketchup.validation('randomWord', 'Try the other word', function(form, el, value, word1, word2) {
return (this.randomNumber(0, 1) ? word1 : word2) == value;
});
$('#own-helper').ketchup();
In the examples above we set the message for the validations directly as second argument in the validate()
function. This is not necessary. If you want to seperate the messages from the validation code you have
two choices.
Either overwrite single messages:
$.ketchup.message('word', 'Guess the word!');
Or pass in an object to the messages() method (you can copy and paste them from the last version of Ketchup).
Note that only declared validation messages gets overwritten, the others are still set.
$.ketchup.messages({
required : 'Something?',
minlength: '>= {arg1}'
});
Time to control the behavior and the style of the error container. Several functions can be overwritten leaving creating, showing and hiding the error container and add error messages completely up to you.
createErrorContainer(function(form, el) {})
This function creates the error container one time. form is the form we are currently in and el the element
we are currently validating. It must return a jQuery object of the error container.
showErrorContainer(function(form, el, container) {})
This function shows the error container every time the field el fails to validate.
form is the form we are currently in and el the element we are currently validating.
container is the jQuery object of the error container, you created it with createErrorContainer().
Must not return anything
hideErrorContainer(function(form, el, container) {})
As opposite to showErrorContainer() this function hides the error container when the field el validates fine.
It pass in the same arguments as showErrorContainer() and must not return anything.
addErrorMessages(function(form, el, container, messages) {})
If the field el fails to validate you need to update the error messages via this function. form, el and container
are the same arguments as in showErrorContainer() and hideErrorContainer(). messages is a Array containing strings
of all error messages the field fails to validate.
.ketchup-custom {
line-height: 1em;
display: none;
}
.ketchup-custom li {
font-size: 10px;
text-transform: uppercase;
text-shadow: 1px 1px 0 #9F4631;
border: 0;
color: white;
background: #F46644;
padding: 1px 10px;
margin-top: 1px;
}
<form id="custom-behavior" action="index.html">
<ul>
<li>
<label for="cb-mail">E-Mail</label>
<input type="text" id="cb-mail" data-validate="validate(required, email)" />
</li>
<li>
<label for="cb-username">Username</label>
<input type="text" id="cb-username" data-validate="validate(required, minlength(3))" />
</li>
<li>
<input type="submit" value="Is Tasty?" />
</li>
</ul>
</form>
$.ketchup
.createErrorContainer(function(form, el) {
return $('<ul/>', {
'class': 'ketchup-custom'
}).insertAfter(el);
})
.addErrorMessages(function(form, el, container, messages) {
container.html('');
for(i = 0; i < messages.length; i++) {
$('<li/>', {
text: messages[i]
}).appendTo(container);
}
})
.showErrorContainer(function(form, el, container) {
container.slideDown('fast');
})
.hideErrorContainer(function(form, el, container) {
container.slideUp('fast');
});
$('#custom-behavior').ketchup({
validateEvents: 'blur focus keyup'
});
<form id="ketchup-events" action="index.html">
<ul>
<li>
<label for="ke-username">Username</label>
<input type="text" id="ke-username" data-validate="validate(required, username, minlength(5))" />
</li>
<li>
<input type="submit" value="Is Tasty?" />
</li>
</ul>
</form>
$('#ketchup-events')
.bind('formIsValid', function(event, form) {
//do whatever when the form is valid
//form - the form that is valid (jQuery Object)
})
.bind('formIsInvalid', function(event, form) {
//do whatever when the form is invalid
//form - the form that is invalid (jQuery Object)
})
.bind('fieldIsValid', function(event, form, el) {
//do whatever if a field is valid
//form - the form where the el is located (jQuery Object)
//el - the element that is valid (jQuery Object)
})
.bind('fieldIsInvalid', function(event, form, el) {
//do whatever if a field is invalid
//form - the form where the el is located (jQuery Object)
//el - the element that is invalid (jQuery Object)
})
.ketchup();
You can use Ketchup's internal function to check if a form or a field is valid from your own script without
triggering the validation container. el.ketchup('isValid') returns true if the form/field (el) is valid,
otherwise it returns false.
If you want to trigger the validation from your script use el.ketchup('validate') where el is the field.
#from-outside { position: relative; }
#fo-errors {
position: absolute;
top: 30px;
left: 200px;
}
#fo-errors li { padding: 0 10px; margin-bottom: 1px; }
#fo-errors .valid { background: #9ADF61; }
#fo-errors .invalid { background: #F46644; }
#from-outside .ketchup-custom { position: absolute; left: -30000px; } /* hide ketchup errors on blur and form submit */
<form id="from-outside" action="index.html">
<ul>
<li>
<label for="fo-mail">E-Mail</label>
<input type="text" id="fo-mail" data-validate="validate(required, email)" />
</li>
<li>
<label for="fo-username">Username</label>
<input type="text" id="fo-username" data-validate="validate(required, username, minlength(5))" />
</li>
<li>
<input type="submit" value="Is Tasty?" />
</li>
</ul>
</form>
var form = $('#from-outside'),
mail = $('#fo-mail', form),
username = $('#fo-username', form),
result = $('<ul/>', { id: 'fo-errors' }).appendTo(form);
form
.ketchup()
.find('input').keyup(function() {
result.html('');
$.each([form, mail, username], function(index, el) {
var valid = el.ketchup('isValid') ? 'valid' : 'invalid';
$('<li/>', {
'class': valid,
text : '#' + el.attr('id') + ' is ' + valid
}).appendTo(result);
});
})
.last().keyup();
attribute : 'data-validate', //look in that attribute for an validation string
validateIndicator : 'validate', //in the validation string this indicates the validations eg validate(required)
eventIndicator : 'on', //in the validation string this indicates the events when validations get fired eg on(blur)
validateEvents : 'blur', //the default event when validations get fired on every field
validateElements : ['input', 'textarea', 'select'],//check this fields in the form for a validation string on the attribute
createErrorContainer: null, //function to create the error container (can also be set via $.ketchup.createErrorContainer(fn))
showErrorContainer : null, //function to show the error container (can also be set via $.ketchup.showErrorContainer(fn))
hideErrorContainer : null, //function to hide the error container (can also be set via $.ketchup.hideErrorContainer(fn))
addErrorMessages : null //function to add error messages to the error container (can also be set via $.ketchup.addErrorMessages(fn))
The jQuery Ketchup Plugin is dual licensed under the GPL and MIT licenses.
(c) 2011 Sebastian Senf - http://mustardamus.com - http://usejquery.com - @mustardamus