/// <summary>
/// Creates a new HTML element.
/// </summary>
/// <param name="tagName">The tag of the HTML element.</param>
/// <returns>The newly created HTML element.</returns>
public HtmlElement CreateElement(string tagName)
{
HtmlElement element = HtmlElementFactory.Create(tagName);
element.MetaId = Guid.NewGuid().ToString();
element.Document = this;
AddMetaId(element, $"document.createElement('{element.TagName}')");
return(element);
}
/// <summary>
/// Gets an HTML element from a js expression.
/// </summary>
/// <param name="expression">The expression.</param>
/// <returns>The HTML element.</returns>
internal HtmlElement GetElementByExpression(string expression)
{
bool exists = JavaScript.Execute <bool>($"{expression} instanceof HTMLElement");
if (!exists)
{
throw new ArgumentException("Given expression does not evaluate to an object.", nameof(expression));
}
string metaId = JavaScript.Execute <string>($"metaIdTableReverse.get({expression})");
if (!string.IsNullOrEmpty(metaId))
{
return(Elements[metaId]);
}
string tag = JavaScript.Execute <string>($"{expression}.tagName");
HtmlElement element = HtmlElementFactory.Create(tag);
element.Document = this;
element.MetaId = Guid.NewGuid().ToString();
AddMetaId(element, expression);
return(element);
}
/// <summary>
/// Gets a collection of HTML elements with a given type.
/// </summary>
/// <typeparam name="T">The type of HTML elements to get.</typeparam>
/// <returns>A collection of HTML elements.</returns>
public HtmlCollection <T> GetElementsByTagName <T>()
where T : HtmlElement
=> CreateCollection <T>($"document.getElementsByTagName('{HtmlElementFactory.GetTag<T>()}')");