HtmlFormControlElement
Represents the base class for all HTML form control elements.
using AngleSharp.Dom.Collections;
using AngleSharp.Extensions;
using AngleSharp.Html;
using System.Collections.Generic;
using System.Linq;
namespace AngleSharp.Dom.Html
{
internal abstract class HtmlFormControlElement : HtmlElement, ILabelabelElement, IValidation
{
private readonly NodeList _labels;
private readonly ValidityState _vstate;
private string _error;
public string Name {
get {
return GetOwnAttribute(AttributeNames.Name);
}
set {
SetOwnAttribute(AttributeNames.Name, value);
}
}
public IHtmlFormElement Form => GetAssignedForm();
public bool IsDisabled {
get {
if (GetOwnAttribute(AttributeNames.Disabled) == null)
return IsFieldsetDisabled();
return true;
}
set {
SetOwnAttribute(AttributeNames.Disabled, value ? string.Empty : null);
}
}
public bool Autofocus {
get {
return GetOwnAttribute(AttributeNames.AutoFocus) != null;
}
set {
SetOwnAttribute(AttributeNames.AutoFocus, value ? string.Empty : null);
}
}
public bool SupportsLabels => true;
public INodeList Labels => _labels;
public string ValidationMessage {
get {
if (!_vstate.IsCustomError)
return string.Empty;
return _error;
}
}
public bool WillValidate {
get {
if (!IsDisabled)
return CanBeValidated();
return false;
}
}
public IValidityState Validity {
get {
Check(_vstate);
return _vstate;
}
}
public HtmlFormControlElement(Document owner, string name, string prefix, NodeFlags flags = NodeFlags.None)
: base(owner, name, prefix, flags | NodeFlags.Special)
{
_vstate = new ValidityState();
_labels = new NodeList();
}
public override INode Clone(bool deep = true)
{
HtmlFormControlElement htmlFormControlElement = (HtmlFormControlElement)base.Clone(deep);
htmlFormControlElement.SetCustomValidity(_error);
return htmlFormControlElement;
}
public bool CheckValidity()
{
if (WillValidate)
return Validity.IsValid;
return false;
}
public void SetCustomValidity(string error)
{
_vstate.IsCustomError = !string.IsNullOrEmpty(error);
_error = error;
}
protected virtual bool IsFieldsetDisabled()
{
IEnumerable<IHtmlFieldSetElement> enumerable = this.GetAncestors().OfType<IHtmlFieldSetElement>();
foreach (IHtmlFieldSetElement item in enumerable) {
if (item.IsDisabled) {
INode parent = item.ChildNodes.FirstOrDefault((INode m) => m is IHtmlLegendElement);
return !this.IsDescendantOf(parent);
}
}
return false;
}
internal virtual void ConstructDataSet(FormDataSet dataSet, HtmlElement submitter)
{
}
internal virtual void Reset()
{
}
protected virtual void Check(ValidityState state)
{
}
protected abstract bool CanBeValidated();
}
}