/// <summary>
/// Process the data table building.
/// </summary>
/// <param name="context">Contains information associated with the current HTML tag.</param>
/// <param name="output">A stateful HTML element used to generate an HTML tag.</param>
/// <returns>A <see cref="Task"/> that on completion updates the output.</returns>
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
await base.ProcessAsync(context, output);
output.Attributes.SetAttribute("id", context.UniqueId);
if (Data == null && DataType == null)
{
throw new InvalidOperationException("No data specified.");
}
if (Data != null)
{
DataType = Data.GetType().GetInterface("IEnumerable`1")?.GetGenericArguments()[0]
?? throw new NotSupportedException();
}
var viewModel = await FactoryCache.GetOrCreateAsync(DataType,
entry => DataRowFunctions.Factory((Type)entry.Key));
output.TagName = "table";
output.TagMode = TagMode.StartTagAndEndTag;
output.Attributes.AddClass("data-table table table-sm table-striped");
output.PreElement.AppendHtml("<div class=\"table-wrapper\">");
output.PostElement.AppendHtml("</div>");
PrintScript(context.UniqueId, viewModel, output.PostElement);
if (AutoWidth)
{
output.Attributes.Add("style", "width:auto");
}
var thead = new TagBuilder("thead").WithBody(viewModel.THead);
if (TableHeaderClass != null)
{
thead.AddCssClass(TableHeaderClass);
}
output.Content.AppendHtml("\r\n").AppendHtml(thead);
if (Data != null)
{
var tbody = new TagBuilder("tbody");
foreach (var item in Data)
{
if (item == null)
{
tbody.InnerHtml.SetHtmlContent("<tr><td>NULL error</td></tr>");
break;
}
else
{
var tr = viewModel.TRow(item);
tr.MergeAttribute("role", "row");
tbody.InnerHtml.AppendHtml("\r\n").AppendHtml(tr);
}
}
output.Content.AppendHtml(tbody);
}
}
/// <summary>
/// Appends a <c><table></c> element.
/// </summary>
/// <typeparam name="TElement">The element types.</typeparam>
/// <param name="elements">The inner elements.</param>
/// <param name="tableClass">The attached class for table.</param>
/// <param name="theadClass">The attached class for thead.</param>
/// <returns>The <see cref="IHtmlContentBuilder"/>.</returns>
protected IHtmlContentBuilder AppendDataTable <TElement>(
IReadOnlyList <TElement> elements,
string?tableClass = null,
string?theadClass = null)
where TElement : class
{
// Justification: the factory is implemented with Task.FromResult.
var viewModel = DataTableFactoryCache.GetOrCreate(typeof(TElement),
entry => DataRowFunctions.Factory((Type)entry.Key)).Result;
var uniqueId = Guid.NewGuid().ToString()[0..6];
