#About

TinyValidation is a jQuery plugin for simple form validation. It validates fields using built-in validators (notEmpty, email, matchesOtherField) and/or custom validation functions. You specify which form elements to validate through a data-validate HTML attribute, which is a comma- or space-separated list of validators to run for that element. The matchesOtherField validator checks that the value passed matches the value of another element. The other element is determined via a selector specified via the data-match-field-selector. This is useful when implementing confirmation fields, e.g., password confirmations.

##Example

Example markup:

<form id="form1">
  <label for="name">Name</label>
  <input type="text" id="name" data-validate="notEmpty" />
  <label for="email">Email</label>
  <input type="text" id="email" data-validate="email, notEmpty" />
</form>

Example JavaScript:

$('#form1').tinyValidation({validateOnKeyUp: true});

##Options

The following options can be passed to tinyValidation in an optional hash:

disableSubmit. Disables all submit buttons unless every field with validations has been marked as valid. Default: true.
validateOnBlur. Determines whether validations are run on blur events. Default: true.
validateOnKeyUp. Determines whether validations are run on keyUp events. Default: false.
errorClass. The name of the class added to form elements with invalid values. Default: error.
validClass. The name of the class added to form elements with valid values. Default: valid.
onError. Function called after a field has failed validation. The first argument passed to the function is the form element, and the second is an array of error messages (as strings). Default: null.
onValid. Function called after a field has been validated successfully. The function will be passed the form element that was validated.
validators. A hash in which the keys are the names of validation functions, and the values are functions that accept an input value and return true if the validation succeeds, and false (or an error message) if the validation fails.
immediateValidation. When false, errors don't run (i.e., classes aren't added and onError callbacks aren't called) until after the field has lost focus once after the user has typed in it or the field has validated successfully. This solves the problem of, e.g., tabbing into an email field and immediately getting an "invalid email" error. When true, errors run on the first keyup or blur event, depending on the settings above. Default false.

Additionally, if the form has a data-validate-on-load HTML attribute with the value true, the form will be validated on page load.

##Custom validation functions

In addition to the notEmpty, email and matchesOtherField validation functions provided by default, you can define your own. The following example checks if a field follows the standard format for a US zip code (e.g., 12345 or 12345-1234).

$('#form1').tinyValidation({
  validators: {
    zipCode: function(zip) {
      var re = /^\d{5}(-?\d{4})?$/;
      return re.test(zip) ? true : "Invalid zip code (ex. 12345 or 12345-1234)";
}}});

This function will be called for any input fields with zipCode in its data-validate HTML attribute. The validator is passed the value to be validated. The context (i.e., this) in the validator function is the HTML element being validated.

##License

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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