private void AppendInitializeSelectEnumFunction(StringBuilder sb, SelectDropdownContext selectDropdownContext, string functionName, string className)
{
Contract.Requires(sb != null && selectDropdownContext != null);
string dataString = null;
if (selectDropdownContext.OptionDataSet != null)
{
var elements = selectDropdownContext.OptionDataSet.Select(x => $"{{id:'{x.Value}', text:'{x.Text}'}}").ToArray();
dataString = string.Join(",", elements);
}
sb.AppendLine("function " + functionName + "(){");
sb.AppendLine("var select = $(\"." + className + "\").select2({");
sb.AppendLine("data: [" + dataString + "]");
sb.AppendLine("});");
sb.AppendLine("}");
}
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
if (context == null || output == null)
{
throw new ArgumentNullException();
}
Contract.EndContractBlock();
var selectDropdownContext = new SelectDropdownContext();
context.Items.Add(typeof(SelectDropdownTagHelper), selectDropdownContext);
await output.GetChildContentAsync();
var modelExpression = SelectedValueProperty ?? SelectedIdProperty;
var key = modelExpression.Name.ToLower();
var className = $"select2-dropdown-{key}";
var currentValues = _generator.GetCurrentValues(ViewContext, modelExpression.ModelExplorer, modelExpression.Name, false);
var selectBuilder = _generator.GenerateSelect(ViewContext, modelExpression.ModelExplorer, null, modelExpression.Name, Enumerable.Empty <SelectListItem>(), currentValues, false, null);
if (selectBuilder != null)
{
var classes = className;
if (context.AllAttributes.TryGetAttribute("class", out var classTag))
{
classes = $"{classes} {classTag.Value}";
}
if (selectBuilder.Attributes.ContainsKey("class"))
{
selectBuilder.Attributes["class"] = $"{selectBuilder.Attributes["class"]} {classes}";
}
else
{
selectBuilder.Attributes.Add("class", classes);
}
output.Content.AppendHtml(selectBuilder);
}
output.Content.AppendLine();
output.TagName = "";
var sb = new StringBuilder();
AppendLocalizationScript(sb);
var initializeFunctionName = "initializeFunction";
sb.AppendLine("<script type=\"text/javascript\">");
if (SelectedValueProperty != null)
{
if (OptionDataSet != null)
{
AppendInitializeSelectDataSetFunction(sb, OptionDataSet, initializeFunctionName, className);
}
else if (selectDropdownContext.OptionDataSet != null)
{
AppendInitializeSelectDataSetFunction(sb, selectDropdownContext.OptionDataSet, initializeFunctionName, className);
}
}
else if (SelectedIdProperty != null)
{
AppendInitializeSelectAjaxFunction(sb, initializeFunctionName, className);
}
else
{
throw new NotImplementedException();
}
sb.AppendLine(initializeFunctionName + "();");
sb.AppendLine("</script>");
output.Content.AppendHtml(sb.ToString());
}
