Are You Sure? - A light "dirty forms" JQuery Plugin
======
**Version:** 1.9
*Are-you-sure* (```jquery.are-you-sure.js```) is simple light-weight "dirty
form" JQuery Plugin for modern browsers. It helps prevent users from losing
unsaved HTML Form changes by promoting the user to save/submit.
It's simple to use. Just add the following line to your page's ready
function:
```javascript
$('form').areYouSure();
```
*Are-you-sure* is a minimal plugin for modern browsers. There are plenty of
"dirty forms" implementations out there, however they all seemed very
heavyweight and over-engineered...! Most were written some time back and
contain many 'hacks' to support legacy browsers, and/or rely on other fat
dependencies such as FaceBox or jQueryUI. *Are-you-sure* solves this by
doing this simple task in the simplest possible way.
*Are-you-sure* is as simple as it gets:
* 100% JS with zero dependencies and no external CSS.
* Leverages `onBeforeUnload` to detect all page/browser exit events.
* Works on forms of any size.
* Correct state management - if a user edits then restores a value, the form
is not considered dirty.
* Easy to understand - less than a "terminal screen" of code!
* Graceful degradation on legacy browsers (i.e. if you're running an old
browser... remember to save :-)
###Basic Usage
```javascript
$(function() {
// Enable on all forms
$('form').areYouSure();
// Enable on selected forms
$('form.dirty-check').areYouSure();
// With a custom message
$('form').areYouSure( {'message':'Your profile details are not saved!'} );
}
```
To ignore selected fields from the dirtyness check:
```html
<form id="myForm" name="myform" action="/post" method="post">
Field 1: (checked) <input type="text" name="field1"> <br />
Field 2: (ignored): <input type="text" name="field2" data-ays-ignore="true"> <br />
Field 3: (ignored): <input type="text" name="field3" class="ays-ignore"> <br />
<input type="submit" value="Submit">
</form>
```
###Advanced Usage
```javascript
$(function() {
/*
* Make Are-You-Sure "silent" by disabling the warning message
* (tracking/monitoring only mode). This option is useful when you wish to
* use the dirty/save events and/or use the dirtyness tracking in your own
* beforeunload handler.
*/
$('form').areYouSure( {'silent':true} );
/*
* Dirtyness Change Events
* Are-You-Sure fires off "dirty" and "clean" events when the form's state
* changes. You can bind() or on(), these events to implement your own form
* state logic. A good example is enabling/disabling a Save button.
*
* "this" refers to the form that fired the event.
*/
$('form').on('dirty.areYouSure', function() {
// Enable save button only as the form is dirty.
$(this).find('input[type="submit"]').removeAttr('disabled');
});
$('form').on('clean.areYouSure', function() {
// Form is clean so nothing to save - disable the save button.
$(this).find('input[type="submit"]').attr('disabled', 'disabled');
});
/*
* It's easy to test if a form is dirty in your own code - just check
* to see if it has a "dirty" CSS class.
*/
if ($('#my-form').hasClass('dirty')) {
// Do something
}
/*
* If you're dynamically adding new fields/inputs, and would like to track
* their state, trigger Are-You-Sure to rescan the form like this:
*/
$('#my-form').trigger('rescan.areYouSure');
/*
* If you'd like to reset/reinitialize the form's state as clean and
* start tracking again from this new point onwards, trigger the
* reinitalize as follows. This is handy if say you've managing your
* own form save/submit via asyc AJAX.
*/
$('#my-form').trigger('reinitialize.areYouSure');
/*
* In some situations it may be desirable to look for other form
* changes such as adding/removing fields. This is useful for forms that
* can change their field count, such as address/phone contact forms.
* Form example, you might remove a phone number from a contact form
* but update nothing else. This should mark the form as dirty.
*/
$('form').areYouSure( {'addRemoveFieldsMarksDirty':true} );
/*
* Sometimes you may have advanced forms that change their state via
* custom JavaScript or 3rd-party component JavaScript. Are-You-Sure may
* not automatically detect these state changes. Examples include:
* - Updating a hidden input field via background JS.
* - Using a [rich WYSIWYG edit control](https://github.com/codedance/jquery.AreYouSure/issues/17).
* One solution is to manually trigger a form check as follows:
*/
$('#my-form').trigger('checkform.areYouSure');
/*
* As an alternative to using events, you can pass in a custom change
* function.
*/
$('#my-adv-form').areYouSure({
change: function() {
// Enable save button only if the form is dirty. i.e. something to save.
if ($(this).hasClass('dirty')) {
$(this).find('input[type="submit"]').removeAttr('disabled');
} else {
$(this).find('input[type="submit"]').attr('disabled', 'disabled');
}
}
});
/*
* Mixing in your own logic into the warning.
*/
$('#my-form').areYouSure( {'silent':true} );
$(window).on('beforeunload', function() {
isSunday = (0 == (new Date()).getDay());
if ($('#my-form').hasClass('dirty') && isSunday) {
return "Because it's Sunday, I'll be nice and let you know you forgot to save!";
}
}
}
```
The [demo page](http://www.papercut.com/products/free_software/are-you-sure/demo/are-you-sure-demo.html)
shows the advanced usage options in more detail.
###Install
Are-You-Sure is a light-weight jQuery plugin - it's a single standalone
JavaScript file. You can download the
[jquery.are-you-sure.js](https://raw.github.com/codedance/jquery.AreYouSure/master/jquery.are-you-sure.js)
file and include it in your page. Because it's so simple it seems a shame
to add an extra browser round trip. It's recommended that you consider
concatenating it with other common JS lib files, and/or even cut-n-pasting
the code (and license header) into one of your existing JS files.
For experimental Mobile Safari support, also include ```ays-beforeunload-shim.js```
(see Known Issues below).
*Are-you-sure* may also be installed with [Bower](http://twitter.github.com/bower/):
```bash
$ bower install jquery.are-you-sure
```
If you're using, or like, *Are-you-sure* make sure you **star/watch** this project
so you can stay up-to-date with updates.
###Demo
This [demo page](http://www.papercut.com/products/free_software/are-you-sure/demo/are-you-sure-demo.html)
hosts a number of example forms.
###Supported Browsers
*Are-you-sure* has been tested on and fully supports the following browsers:
* IE 9 through 11
* Google Chrome (versions since 2012)
* Firefox (versions since 2012)
* Safari (versions since 2012)
Experimental support is available on iOS and Opera via the *beforeunload* shim (see below).
###Known Issues & Limitations
####Mobile Safari and Opera
The ```windows.beforeunload``` event is not supported on iOS (iPhone, iPad, and iPod). An
experimental shim offering partial *beforeunload* emulation is provided to help plug this gap.
It works by scanning the page for anchor links and augments the default behaviour to first
check with *Are-you-sure* before navigating away. To use, simply include
```ays-beforeunload-shim.js``` in your page.
####Firefox
The custom message option may not work on Firefox ([Firefox bug 588292](https://bugzilla.mozilla.org/show_bug.cgi?id=588292)).
###Development
The aim is to keep *Are-you-sure* simple and light. If you think you have
a good idea which is aligned with this objective, please voice your thoughts
in the issues list.
####Pull Requests
If possible, please submit your pull request against the most recent ```dev-*``` branch rather than master. This will make it easier to merge your code into the next planned release.
####Running tests
```bash
$ npm install
$ npm test
```
###Release History
**2014-08-13** (1.9) - This is a minor bugfix release:
* Addressed issue [#45](https://github.com/codedance/jquery.AreYouSure/issues/55) seen with empty select fields.
* Thanks [valgen](https://github.com/valgen) and [tus124](https://github.com/tus124) for the contribution.
**2014-06-22** (1.8) - This is a minor bugfix release:
* Fixed NPE that may occur when using a 'multiple' option field.
* Minor timing tweak to help mitigate bypass issue raised in [#45](https://github.com/codedance/jquery.AreYouSure/issues/45)
* Thanks [apassant](https://github.com/apassant) and [amatenkov](https://github.com/amatenkov) for the contribution.
**2014-05-28** (1.7)
* Fixed multiple warning dialogs that may appear on IE and recent versions of Chrome
* Experimental support for iOS Mobile Safari (via a *beforeunload* shim)
* Various minor fixes (e.g. support input fields with no type=)
* Minor performance improvements on pages with multiple forms
* Improved documentation and examples
* Thanks to [lfjeff](https://github.com/lfjeff) and [aqlong](https://github.com/aqlong) for the contribution and ideas!
**2014-02-07** (1.6)
* Add field count tracking (```addRemoveFieldsMarksDirty```) (contrib *jonegerton*)
* Added event to manually trigger a form check/recheck (contrib *jonegerton*)
* Thanks to [jonegerton](https://github.com/jonegerton) for the contribution!
**2013-11-15** (1.5)
* Added support for HTML5 input field types. (contrib *albinsunnanbo*)
* New option to reinitialize/reset the dirty state. This is handy if you're managing your own async submit/save using AJAX. (contrib *albinsunnanbo*)
* Thanks to [albinsunnanbo](https://github.com/albinsunnanbo) for the contribution!
**2013-10-2** (1.4)
* Added dirty and clean "events"
* Added an option to disable the message (dirty tracking only)
* Added an option to rescan a form to look/detect any new fields
**2013-07-24** - Minor fix - don't fail if form elements have no "name" attribute.
**2013-05-14** - Added support for form reset buttons (contributed by codev).
**2013-05-01** - Added support for hidden and disabled form fields.
**2013-02-03** - Add demo page.
**2013-01-28** - Add ```change``` event support and a demo page.
**2012-10-26** - Use dashes in class names rather than camel case.
**2012-10-24** - Initial public release.
###Prerequisites
jQuery version 1.4.2 or higher. 2.0+ or 1.10+ recommended.
###License
The same as JQuery...
jQuery Plugin: Are-You-Sure (Dirty Form Detection)
https://github.com/codedance/jquery.AreYouSure/
Copyright (c) 2012-2014, Chris Dance - PaperCut Software http://www.papercut.com/
Dual licensed under the MIT or GPL Version 2 licenses.
http://jquery.org/license
