/// <summary>
/// Set the field values of given form by using the dictionary which
/// contains name value pairs of input fields.
/// </summary>
/// <param name="form">The form to set.</param>
/// <param name="fields">The fields to use as values.</param>
/// <param name="createMissing">
/// What to do if some field(s) have not been found in the form. If
/// true, then new input will be created. Otherwise, an exception will
/// be thrown.
/// </param>
/// <returns>The given form for chaining.</returns>
public static IHtmlFormElement SetValues(this IHtmlFormElement form, IDictionary <String, String> fields, Boolean createMissing = false)
{
if (form == null)
{
throw new ArgumentNullException(nameof(form));
}
if (fields == null)
{
throw new ArgumentNullException(nameof(fields));
}
var inputs = form.Elements.OfType <HtmlFormControlElement>();
foreach (var field in fields)
{
var targetInput = inputs.FirstOrDefault(e => e.Name.Is(field.Key));
if (targetInput != null)
{
if (targetInput is IHtmlInputElement)
{
var input = (IHtmlInputElement)targetInput;
if (input.Type.Is(InputTypeNames.Radio))
{
var radios = inputs.OfType <IHtmlInputElement>().Where(i => i.Name.Is(targetInput.Name));
foreach (var radio in radios)
{
radio.IsChecked = radio.Value.Is(field.Value);
}
}
else
{
input.Value = field.Value;
}
}
else if (targetInput is IHtmlTextAreaElement)
{
var textarea = (IHtmlTextAreaElement)targetInput;
textarea.Value = field.Value;
}
else if (targetInput is IHtmlSelectElement)
{
var select = (IHtmlSelectElement)targetInput;
select.Value = field.Value;
}
else
{
//Silently ignore unsupported input type, e.g.,
//no idea if modifying keygen fields is really
//useful or how it is regulated.
}
}
else if (createMissing)
{
var newInput = form.Owner.CreateElement <IHtmlInputElement>();
newInput.Type = InputTypeNames.Hidden;
newInput.Name = field.Key;
newInput.Value = field.Value;
form.AppendChild(newInput);
}
else
{
var message = $"Field {field.Key} not found.";
throw new KeyNotFoundException(message);
}
}
return(form);
}