/// <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="createInputIfNoFound">What to do if some field/s have not found in the form. If true, then new input will be created.
/// If false, KeyNotFoundException will be thrown.
/// The default is false.
/// </param>
public static void SetFieldsValues(this IHtmlFormElement form, IDictionary <string, string> fields, bool createInputIfNoFound = false)
{
if (form == null)
{
throw new ArgumentNullException(nameof(form));
}
if (fields == null)
{
throw new ArgumentNullException(nameof(fields));
}
// The actual execution of these queries is deferred.
var inputs = form.Elements.OfType <IHtmlInputElement>();
var selects = form.Elements.OfType <IHtmlSelectElement>();
foreach (var field in fields)
{
// try to match to an input element.
var input = inputs.FirstOrDefault(e => e.Name == field.Key);
if (input != null)
{
input.Value = field.Value;
continue;
}
// try to match to an select element.
var select = selects.FirstOrDefault(s => s.Name == field.Key);
if (select != null)
{
select.Value = field.Value;
continue;
}
// if no match, create new element or throw an excpetion.
if (createInputIfNoFound)
{
var newElementHtml = $@"<input type='hidden' name='{field.Key}' value='{field.Value}' />";
form.Insert(AdjacentPosition.BeforeEnd, newElementHtml);
}
else
{
throw new KeyNotFoundException($"Field {field.Key} not found");
}
}
}
