// Query
/// <summary>
/// The method runs <c>element.querySelectorAll</c> and then tests a <c>RegExp</c> against the elements <c>textContent</c>. The first element match is returned. If no element matches the selector and regular expression, the return value resolve to <c>null</c>.
/// See also https://stackoverflow.com/a/37098508
/// </summary>
/// <param name="handle">An <see cref="ElementHandle"/> to query</param>
/// <param name="selector">A selector to query element for</param>
/// <param name="regex">A regular expression to test against <c>element.textContent</c></param>
/// <returns>Task which resolves to <see cref="ElementHandle"/> pointing to the element</returns>
public static async Task <ElementHandle> QuerySelectorWithContentAsync(this ElementHandle handle, string selector, string regex)
{
return(await handle.EvaluateFunctionHandleViaReflectionAsync(
@"(element, selector, regex) => {
var elements = element.querySelectorAll(selector);
return Array.prototype.find.call(elements, function(element) {
return RegExp(regex).test(element.textContent);
});
}", selector, regex).ConfigureAwait(false) as ElementHandle);
}
/// <summary>
/// The method runs <c>element.querySelectorAll</c> and then tests a <c>RegExp</c> against the elements <c>textContent</c>. All element matches are returned. If no element matches the selector and regular expression, the return value resolve to <see cref="System.Array.Empty{T}"/>.
/// See also https://stackoverflow.com/a/37098508
/// </summary>
/// <param name="handle">An <see cref="ElementHandle"/> to query</param>
/// <param name="selector">A selector to query element for</param>
/// <param name="regex">A regular expression to test against <c>element.textContent</c></param>
/// <returns>Task which resolves to ElementHandles pointing to the elements</returns>
public static async Task <ElementHandle[]> QuerySelectorAllWithContentAsync(this ElementHandle handle, string selector, string regex)
{
var arrayHandle = await handle.EvaluateFunctionHandleViaReflectionAsync(
@"(element, selector, regex) => {
var elements = element.querySelectorAll(selector);
return Array.prototype.filter.call(elements, function(element) {
return RegExp(regex).test(element.textContent);
});
}", selector, regex).ConfigureAwait(false);
if (arrayHandle == null)
{
throw new InvalidOperationException("EvaluateFunctionHandleAsync returned null.");
}
var properties = await arrayHandle.GetPropertiesAsync().ConfigureAwait(false);
await arrayHandle.DisposeAsync().ConfigureAwait(false);
return(properties.Values.OfType <ElementHandle>().ToArray());
}
