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(function() {
// Technique from Juriy Zaytsev
// http://thinkweb2.com/projects/prototype/detecting-event-support-without-browser-sniffing/
function isEventSupported(eventName) {
var el = document.createElement('div');
eventName = 'on' + eventName;
var isSupported = (eventName in el);
if (!isSupported) {
el.setAttribute(eventName, 'return;');
isSupported = typeof el[eventName] == 'function';
}
el = null;
return isSupported;
}
function isForm(element) {
return Object.isElement(element) && element.nodeName.toUpperCase() == 'FORM';
}
function isInput(element) {
if (Object.isElement(element)) {
var name = element.nodeName.toUpperCase();
return name == 'INPUT' || name == 'SELECT' || name == 'TEXTAREA';
}
else return false;
}
var submitBubbles = isEventSupported('submit'),
changeBubbles = isEventSupported('change');
if (!submitBubbles || !changeBubbles) {
// augment the Event.Handler class to observe custom events when needed
Event.Handler.prototype.initialize = Event.Handler.prototype.initialize.wrap(
function(init, element, eventName, selector, callback) {
init(element, eventName, selector, callback);
// is the handler being attached to an element that doesn't support this event?
if ( (!submitBubbles && this.eventName == 'submit' && !isForm(this.element)) ||
(!changeBubbles && this.eventName == 'change' && !isInput(this.element)) ) {
// "submit" => "emulated:submit"
this.eventName = 'emulated:' + this.eventName;
}
}
);
}
if (!submitBubbles) {
// discover forms on the page by observing focus events which always bubble
document.on('focusin', 'form', function(focusEvent, form) {
// special handler for the real "submit" event (one-time operation)
if (!form.retrieve('emulated:submit')) {
form.on('submit', function(submitEvent) {
var emulated = form.fire('emulated:submit', submitEvent, true);
// if custom event received preventDefault, cancel the real one too
if (emulated.returnValue === false) submitEvent.preventDefault();
});
form.store('emulated:submit', true);
}
});
}
if (!changeBubbles) {
// discover form inputs on the page
document.on('focusin', 'input, select, textarea', function(focusEvent, input) {
// special handler for real "change" events
if (!input.retrieve('emulated:change')) {
input.on('change', function(changeEvent) {
input.fire('emulated:change', changeEvent, true);
});
input.store('emulated:change', true);
}
});
}
function handleRemote(element) {
var method, url, params;
var event = element.fire("ajax:before");
if (event.stopped) return false;
if (element.tagName.toLowerCase() === 'form') {
method = element.readAttribute('method') || 'post';
url = element.readAttribute('action');
// serialize the form with respect to the submit button that was pressed
params = element.serialize({ submit: element.retrieve('rails:submit-button') });
// clear the pressed submit button information
element.store('rails:submit-button', null);
} else {
method = element.readAttribute('data-method') || 'get';
url = element.readAttribute('href');
params = {};
}
new Ajax.Request(url, {
method: method,
parameters: params,
evalScripts: true,
onCreate: function(response) { element.fire("ajax:create", response); },
onComplete: function(response) { element.fire("ajax:complete", response); },
onSuccess: function(response) { element.fire("ajax:success", response); },
onFailure: function(response) { element.fire("ajax:failure", response); }
});
element.fire("ajax:after");
}
function insertHiddenField(form, name, value) {
form.insert(new Element('input', { type: 'hidden', name: name, value: value }));
}
function handleMethod(element) {
var method = element.readAttribute('data-method'),
url = element.readAttribute('href'),
csrf_param = $$('meta[name=csrf-param]')[0],
csrf_token = $$('meta[name=csrf-token]')[0];
var form = new Element('form', { method: "POST", action: url, style: "display: none;" });
$(element.parentNode).insert(form);
if (method !== 'post') {
insertHiddenField(form, '_method', method);
}
if (csrf_param) {
insertHiddenField(form, csrf_param.readAttribute('content'), csrf_token.readAttribute('content'));
}
form.submit();
}
function disableFormElements(form) {
form.select('input[type=submit][data-disable-with]').each(function(input) {
input.store('rails:original-value', input.getValue());
input.setValue(input.readAttribute('data-disable-with')).disable();
});
}
function enableFormElements(form) {
form.select('input[type=submit][data-disable-with]').each(function(input) {
input.setValue(input.retrieve('rails:original-value')).enable();
});
}
function allowAction(element) {
var message = element.readAttribute('data-confirm');
return !message || confirm(message);
}
document.on('click', 'a[data-confirm], a[data-remote], a[data-method]', function(event, link) {
if (!allowAction(link)) {
event.stop();
return false;
}
if (link.readAttribute('data-remote')) {
handleRemote(link);
event.stop();
} else if (link.readAttribute('data-method')) {
handleMethod(link);
event.stop();
}
});
document.on("click", "form input[type=submit], form button[type=submit], form button:not([type])", function(event, button) {
// register the pressed submit button
event.findElement('form').store('rails:submit-button', button.name || false);
});
document.on("submit", function(event) {
var form = event.findElement();
if (!allowAction(form)) {
event.stop();
return false;
}
if (form.readAttribute('data-remote')) {
handleRemote(form);
event.stop();
} else {
disableFormElements(form);
}
});
document.on('ajax:create', 'form', function(event, form) {
if (form == event.findElement()) disableFormElements(form);
});
document.on('ajax:complete', 'form', function(event, form) {
if (form == event.findElement()) enableFormElements(form);
});
Ajax.Responders.register({
onCreate: function(request) {
var csrf_meta_tag = $$('meta[name=csrf-token]')[0];
if (csrf_meta_tag) {
var header = 'X-CSRF-Token',
token = csrf_meta_tag.readAttribute('content');
if (!request.options.requestHeaders) {
request.options.requestHeaders = {};
}
request.options.requestHeaders[header] = token;
}
}
});
})();
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