/* 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 https://mozilla.org/MPL/2.0/. */
use crate::dom::bindings::codegen::Bindings::EventBinding::Event_Binding::EventMethods;
use crate::dom::bindings::codegen::Bindings::HTMLElementBinding::HTMLElementMethods;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::str::DOMString;
use crate::dom::element::Element;
use crate::dom::eventtarget::EventTarget;
use crate::dom::htmldatalistelement::HTMLDataListElement;
use crate::dom::htmlelement::HTMLElement;
use crate::dom::node::Node;
use crate::dom::validitystate::{ValidationFlags, ValidityState};
use crate::script_runtime::CanGc;
/// Trait for elements with constraint validation support
pub(crate) trait Validatable {
fn as_element(&self) -> ∈
/// <https://html.spec.whatwg.org/multipage/#dom-cva-validity>
fn validity_state(&self) -> DomRoot<ValidityState>;
/// <https://html.spec.whatwg.org/multipage/#candidate-for-constraint-validation>
fn is_instance_validatable(&self) -> bool;
// Check if element satisfies its constraints, excluding custom errors
fn perform_validation(&self, _validate_flags: ValidationFlags) -> ValidationFlags {
ValidationFlags::empty()
}
/// <https://html.spec.whatwg.org/multipage/#concept-fv-valid>
fn satisfies_constraints(&self) -> bool {
self.validity_state().invalid_flags().is_empty()
}
/// <https://html.spec.whatwg.org/multipage/#check-validity-steps>
fn check_validity(&self, can_gc: CanGc) -> bool {
if self.is_instance_validatable() && !self.satisfies_constraints() {
self.as_element()
.upcast::<EventTarget>()
.fire_cancelable_event(atom!("invalid"), can_gc);
false
} else {
true
}
}
/// <https://html.spec.whatwg.org/multipage/#report-validity-steps>
fn report_validity(&self, can_gc: CanGc) -> bool {
// Step 1.
if !self.is_instance_validatable() {
return true;
}
if self.satisfies_constraints() {
return true;
}
// Step 1.1.
let event = self
.as_element()
.upcast::<EventTarget>()
.fire_cancelable_event(atom!("invalid"), can_gc);
// Step 1.2.
if !event.DefaultPrevented() {
let flags = self.validity_state().invalid_flags();
println!(
"Validation error: {}",
validation_message_for_flags(&self.validity_state(), flags)
);
if let Some(html_elem) = self.as_element().downcast::<HTMLElement>() {
html_elem.Focus(can_gc);
}
}
// Step 1.3.
false
}
/// <https://html.spec.whatwg.org/multipage/#dom-cva-validationmessage>
fn validation_message(&self) -> DOMString {
if self.is_instance_validatable() {
let flags = self.validity_state().invalid_flags();
validation_message_for_flags(&self.validity_state(), flags)
} else {
DOMString::new()
}
}
}
/// <https://html.spec.whatwg.org/multipage/#the-datalist-element%3Abarred-from-constraint-validation>
pub(crate) fn is_barred_by_datalist_ancestor(elem: &Node) -> bool {
elem.upcast::<Node>()
.ancestors()
.any(|node| node.is::<HTMLDataListElement>())
}
// Get message for given validation flags or custom error message
fn validation_message_for_flags(state: &ValidityState, failed_flags: ValidationFlags) -> DOMString {
if failed_flags.contains(ValidationFlags::CUSTOM_ERROR) {
state.custom_error_message().clone()
} else {
DOMString::from(failed_flags.to_string())
}
}