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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* Handles the validation callback from nsIFormFillController and
* the display of the help panel on invalid elements.
*/
"use strict";
var Cc = Components.classes;
var Ci = Components.interfaces;
var Cu = Components.utils;
var HTMLInputElement = Ci.nsIDOMHTMLInputElement;
var HTMLTextAreaElement = Ci.nsIDOMHTMLTextAreaElement;
var HTMLSelectElement = Ci.nsIDOMHTMLSelectElement;
var HTMLButtonElement = Ci.nsIDOMHTMLButtonElement;
this.EXPORTED_SYMBOLS = [ "FormSubmitObserver" ];
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/BrowserUtils.jsm");
function FormSubmitObserver(aWindow, aTabChildGlobal) {
this.init(aWindow, aTabChildGlobal);
}
FormSubmitObserver.prototype =
{
_validationMessage: "",
_content: null,
_element: null,
/*
* Public apis
*/
init: function(aWindow, aTabChildGlobal)
{
this._content = aWindow;
this._tab = aTabChildGlobal;
this._mm =
this._content.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDocShell)
.sameTypeRootTreeItem
.QueryInterface(Ci.nsIDocShell)
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIContentFrameMessageManager);
// nsIFormSubmitObserver callback about invalid forms. See HTMLFormElement
// for details.
Services.obs.addObserver(this, "invalidformsubmit", false);
this._tab.addEventListener("pageshow", this, false);
this._tab.addEventListener("unload", this, false);
},
uninit: function()
{
Services.obs.removeObserver(this, "invalidformsubmit");
this._content.removeEventListener("pageshow", this, false);
this._content.removeEventListener("unload", this, false);
this._mm = null;
this._element = null;
this._content = null;
this._tab = null;
},
/*
* Events
*/
handleEvent: function (aEvent) {
switch (aEvent.type) {
case "pageshow":
if (this._isRootDocumentEvent(aEvent)) {
this._hidePopup();
}
break;
case "unload":
this.uninit();
break;
case "input":
this._onInput(aEvent);
break;
case "blur":
this._onBlur(aEvent);
break;
}
},
/*
* nsIFormSubmitObserver
*/
notifyInvalidSubmit : function (aFormElement, aInvalidElements)
{
// We are going to handle invalid form submission attempt by focusing the
// first invalid element and show the corresponding validation message in a
// panel attached to the element.
if (!aInvalidElements.length) {
return;
}
// Insure that this is the FormSubmitObserver associated with the
// element / window this notification is about.
let element = aInvalidElements.queryElementAt(0, Ci.nsISupports);
if (this._content != element.ownerGlobal.top.document.defaultView) {
return;
}
if (!(element instanceof HTMLInputElement ||
element instanceof HTMLTextAreaElement ||
element instanceof HTMLSelectElement ||
element instanceof HTMLButtonElement)) {
return;
}
// Update validation message before showing notification
this._validationMessage = element.validationMessage;
// Don't connect up to the same element more than once.
if (this._element == element) {
this._showPopup(element);
return;
}
this._element = element;
element.focus();
// Watch for input changes which may change the validation message.
element.addEventListener("input", this, false);
// Watch for focus changes so we can disconnect our listeners and
// hide the popup.
element.addEventListener("blur", this, false);
this._showPopup(element);
},
/*
* Internal
*/
/*
* Handles input changes on the form element we've associated a popup
* with. Updates the validation message or closes the popup if form data
* becomes valid.
*/
_onInput: function (aEvent) {
let element = aEvent.originalTarget;
// If the form input is now valid, hide the popup.
if (element.validity.valid) {
this._hidePopup();
return;
}
// If the element is still invalid for a new reason, we should update
// the popup error message.
if (this._validationMessage != element.validationMessage) {
this._validationMessage = element.validationMessage;
this._showPopup(element);
}
},
/*
* Blur event handler in which we disconnect from the form element and
* hide the popup.
*/
_onBlur: function (aEvent) {
aEvent.originalTarget.removeEventListener("input", this, false);
aEvent.originalTarget.removeEventListener("blur", this, false);
this._element = null;
this._hidePopup();
},
/*
* Send the show popup message to chrome with appropriate position
* information. Can be called repetitively to update the currently
* displayed popup position and text.
*/
_showPopup: function (aElement) {
// Collect positional information and show the popup
let panelData = {};
panelData.message = this._validationMessage;
// Note, this is relative to the browser and needs to be translated
// in chrome.
panelData.contentRect = BrowserUtils.getElementBoundingRect(aElement);
// We want to show the popup at the middle of checkbox and radio buttons
// and where the content begin for the other elements.
let offset = 0;
if (aElement.tagName == 'INPUT' &&
(aElement.type == 'radio' || aElement.type == 'checkbox')) {
panelData.position = "bottomcenter topleft";
} else {
let win = aElement.ownerGlobal;
let style = win.getComputedStyle(aElement, null);
if (style.direction == 'rtl') {
offset = parseInt(style.paddingRight) + parseInt(style.borderRightWidth);
} else {
offset = parseInt(style.paddingLeft) + parseInt(style.borderLeftWidth);
}
let zoomFactor = this._getWindowUtils().fullZoom;
panelData.offset = Math.round(offset * zoomFactor);
panelData.position = "after_start";
}
this._mm.sendAsyncMessage("FormValidation:ShowPopup", panelData);
},
_hidePopup: function () {
this._mm.sendAsyncMessage("FormValidation:HidePopup", {});
},
_getWindowUtils: function () {
return this._content.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
},
_isRootDocumentEvent: function (aEvent) {
if (this._content == null) {
return true;
}
let target = aEvent.originalTarget;
return (target == this._content.document ||
(target.ownerDocument && target.ownerDocument == this._content.document));
},
QueryInterface : XPCOMUtils.generateQI([Ci.nsIFormSubmitObserver])
};
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