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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.
*/
import { LayoutUtils } from "resource://gre/modules/LayoutUtils.sys.mjs";
export class FormValidationChild extends JSWindowActorChild {
constructor() {
super();
this._validationMessage = "";
this._element = null;
}
/*
* Events
*/
handleEvent(aEvent) {
switch (aEvent.type) {
case "MozInvalidForm":
aEvent.preventDefault();
this.notifyInvalidSubmit(aEvent.detail);
break;
case "pageshow":
if (this._isRootDocumentEvent(aEvent)) {
this._hidePopup();
}
break;
case "pagehide":
// Act as if the element is being blurred. This will remove any
// listeners and hide the popup.
this._onBlur();
break;
case "input":
this._onInput(aEvent);
break;
case "blur":
this._onBlur(aEvent);
break;
}
}
notifyInvalidSubmit(aInvalidElements) {
// Show a validation message on the first focusable element.
for (let element of aInvalidElements) {
// Insure that this is the FormSubmitObserver associated with the
// element / window this notification is about.
if (this.contentWindow != element.ownerGlobal.document.defaultView) {
return;
}
if (
!(
ChromeUtils.getClassName(element) === "HTMLInputElement" ||
ChromeUtils.getClassName(element) === "HTMLTextAreaElement" ||
ChromeUtils.getClassName(element) === "HTMLSelectElement" ||
ChromeUtils.getClassName(element) === "HTMLButtonElement" ||
element.isFormAssociatedCustomElements
)
) {
continue;
}
let validationMessage = element.isFormAssociatedCustomElements
? element.internals.validationMessage
: element.validationMessage;
if (element.isFormAssociatedCustomElements) {
// For element that are form-associated custom elements, user agents
// should use their validation anchor instead.
// It is not clear how constraint validation should work for FACE in
// spec if the validation anchor is null, see
// https://github.com/whatwg/html/issues/10155. Blink seems fallback to
// FACE itself when validation anchor is null, which looks reasonable.
element = element.internals.validationAnchor || element;
}
if (!element || !Services.focus.elementIsFocusable(element, 0)) {
continue;
}
// Update validation message before showing notification
this._validationMessage = validationMessage;
// Don't connect up to the same element more than once.
if (this._element == element) {
this._showPopup(element);
break;
}
this._element = element;
element.focus();
// Watch for input changes which may change the validation message.
element.addEventListener("input", this);
// Watch for focus changes so we can disconnect our listeners and
// hide the popup.
element.addEventListener("blur", this);
this._showPopup(element);
break;
}
}
/*
* 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(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() {
if (this._element) {
this._element.removeEventListener("input", this);
this._element.removeEventListener("blur", this);
}
this._hidePopup();
this._element = null;
}
/*
* 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(aElement) {
// Collect positional information and show the popup
let panelData = {};
panelData.message = this._validationMessage;
panelData.screenRect = LayoutUtils.getElementBoundingScreenRect(aElement);
// We want to show the popup at the middle of checkbox and radio buttons
// and where the content begin for the other elements.
if (
aElement.tagName == "INPUT" &&
(aElement.type == "radio" || aElement.type == "checkbox")
) {
panelData.position = "bottomcenter topleft";
} else {
panelData.position = "after_start";
}
this.sendAsyncMessage("FormValidation:ShowPopup", panelData);
aElement.ownerGlobal.addEventListener("pagehide", this, {
mozSystemGroup: true,
});
}
_hidePopup() {
this.sendAsyncMessage("FormValidation:HidePopup", {});
this._element.ownerGlobal.removeEventListener("pagehide", this, {
mozSystemGroup: true,
});
}
_isRootDocumentEvent(aEvent) {
if (this.contentWindow == null) {
return true;
}
let target = aEvent.originalTarget;
return (
target == this.document ||
(target.ownerDocument && target.ownerDocument == this.document)
);
}
}
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