private static MvcHtmlString CascadingDropDownListInternal([NotNull] HtmlHelper thisValue, [NotNull] string name, [NotNull] string triggeredByProperty, CascadeDropDownListSettings settings = null, RouteValueDictionary htmlAttributes = null)
{
name = name.Trim();
if (string.IsNullOrEmpty(name))
{
throw new ArgumentNullException(nameof(name));
}
settings ??= new CascadeDropDownListSettings();
htmlAttributes ??= new RouteValueDictionary();
string cascadeDdElementId = settings.Id?.Trim();
if (string.IsNullOrEmpty(cascadeDdElementId))
{
cascadeDdElementId = GetDropDownElementId(htmlAttributes);
}
if (string.IsNullOrEmpty(cascadeDdElementId))
{
cascadeDdElementId = name;
}
htmlAttributes.Add("data-cascade-dd-url", settings.Url);
string setDisableString = string.Empty;
string removeDisabledString = string.Empty;
if (settings.OptionLabel != null)
{
htmlAttributes.Add("data-option-lbl", settings.OptionLabel);
}
if (settings.DisabledWhenParentNotSelected)
{
htmlAttributes.Add("disabled", "disabled");
setDisableString = "targetElement.setAttribute('disabled','disabled');";
removeDisabledString = "targetElement.removeAttribute('disabled');";
}
MvcHtmlString defaultDropDownHtml = thisValue.DropDownList(name, Array.Empty <SelectListItem>(), settings.OptionLabel, htmlAttributes);
StringBuilder builder = new StringBuilder(Constants.BUFFER_KB);
string optionLblStr = settings.OptionLabel == null ? "''" : $@"'<option value="""">{settings.OptionLabel}</option>'";
builder.AppendFormat(Js1CreateInitFunction, cascadeDdElementId, triggeredByProperty, settings.SelectedValue, removeDisabledString, optionLblStr, setDisableString);
builder.Append(string.IsNullOrEmpty(settings.ClientSideEvents.BeforeSend)
? string.Format(Js2SimpleGenerateJsonToSendFormat, settings.AjaxActionParamName)
: string.Format(Js2GenerateJsonToSendFromFunctionFormat, settings.ClientSideEvents.BeforeSend, settings.AjaxActionParamName));
builder.Append(settings.HttpMethod == null || settings.HttpMethod != HttpMethod.Post
? Js3InitializeGetRequest
: Js3InitializePostRequest);
string onComplete = null;
string onSuccess = null;
string onFailure = null;
if (!string.IsNullOrEmpty(settings.ClientSideEvents.OnSuccess))
{
onSuccess = $"{settings.ClientSideEvents.OnSuccess}(data);";
}
if (!string.IsNullOrEmpty(settings.ClientSideEvents.OnFailure))
{
onFailure = $"{settings.ClientSideEvents.OnFailure}(request.responseText, request.status, request.statusText);";
}
if (!string.IsNullOrEmpty(settings.ClientSideEvents.OnComplete))
{
onComplete = $"{settings.ClientSideEvents.OnComplete}(data, null);";
}
builder.AppendFormat(Js4OnLoadFormat, onComplete ?? string.Empty, onSuccess ?? string.Empty, onFailure ?? string.Empty);
onComplete = null;
onFailure = null;
if (!string.IsNullOrEmpty(settings.ClientSideEvents.OnComplete) || !string.IsNullOrEmpty(settings.ClientSideEvents.OnFailure))
{
if (!string.IsNullOrEmpty(settings.ClientSideEvents.OnComplete))
{
onComplete = $"{settings.ClientSideEvents.OnComplete}(null, request.responseText);";
}
if (!string.IsNullOrEmpty(settings.ClientSideEvents.OnSuccess))
{
onFailure = $"{settings.ClientSideEvents.OnFailure}(request.responseText, request.status, request.statusText);";
}
builder.AppendFormat(Js5ErrorCallback, onComplete, onFailure);
}
builder.Append(settings.HttpMethod == null || settings.HttpMethod != HttpMethod.Post
? Js6SendGetRequest
: Js6SendPostRequest);
builder.AppendFormat(Js7EndFormat, cascadeDdElementId);
return(new MvcHtmlString(string.Concat(defaultDropDownHtml, Environment.NewLine, "<script type='text/javascript'>", builder, "</script>", Environment.NewLine)));
}
public static MvcHtmlString CascadingDropDownListFor <TModel, TProperty>([NotNull] this HtmlHelper <TModel> thisValue, [NotNull] Expression <Func <TModel, TProperty> > expression, [NotNull] string triggeredByPropertyWithId, CascadeDropDownListSettings settings = null, object htmlAttributes = null)
{
string dropDownElementName = thisValue.GetElementNameFromExpression(expression)?.Trim();
if (string.IsNullOrEmpty(dropDownElementName))
{
throw new ArgumentException("Drop down element name is missing.", nameof(expression));
}
settings ??= new CascadeDropDownListSettings();
if (string.IsNullOrWhiteSpace(settings.Id))
{
settings.Id = thisValue.GetElementIdFromExpression(expression);
}
settings.SelectedValue = GetPropStringValue(thisValue.ViewData.Model, expression);
return(CascadingDropDownListInternal(thisValue, dropDownElementName, triggeredByPropertyWithId, settings, Helpers.HtmlHelper.ToHtmlAttributes(htmlAttributes)));
}
public static MvcHtmlString CascadingDropDownList([NotNull] this HtmlHelper thisValue, [NotNull] string name, [NotNull] string triggeredByProperty, CascadeDropDownListSettings settings = null, RouteValueDictionary htmlAttributes = null)
{
settings ??= new CascadeDropDownListSettings();
settings.SelectedValue = GetPropStringValue(thisValue.ViewData.Model, name);
return(CascadingDropDownListInternal(thisValue, name, triggeredByProperty, settings, htmlAttributes));
}
public static MvcHtmlString CascadingDropDownList <TModel, TProperty>([NotNull] this HtmlHelper <TModel> thisValue, [NotNull] string name, [NotNull] Expression <Func <TModel, TProperty> > triggeredByProperty, CascadeDropDownListSettings settings = null, object htmlAttributes = null)
{
string triggeredByPropId = thisValue.GetElementIdFromExpression(triggeredByProperty)?.Trim();
if (string.IsNullOrEmpty(triggeredByPropId))
{
throw new ArgumentException("Triggered by property id is missing.", nameof(triggeredByProperty));
}
return(CascadingDropDownList(thisValue, name, triggeredByPropId, settings, htmlAttributes));
}