public static MvcHtmlString CascadingDropDownListFor <TModel, TProperty>(
this HtmlHelper <TModel> htmlHelper,
Expression <Func <TModel, TProperty> > expression,
string triggeredByPropertyWithId,
string url,
string ajaxActionParamName,
string optionLabel = null,
bool disabledWhenParentNotSelected = false,
object htmlAttributes = null,
CascadeDropDownOptions options = null)
{
var dropDownElementName = htmlHelper.GetElementNameFromExpression(expression);
var dropDownElementId = GetDropDownElementId(htmlAttributes) ?? htmlHelper.GetElementIdFromExpression(expression);
if (string.IsNullOrEmpty(dropDownElementName) || string.IsNullOrEmpty(dropDownElementId))
{
throw new ArgumentException("expression argument is invalid");
}
return(CascadingDropDownList(
htmlHelper,
dropDownElementName,
dropDownElementId,
triggeredByPropertyWithId,
url,
ajaxActionParamName,
GetPropStringValue(htmlHelper.ViewData.Model, expression),
optionLabel,
disabledWhenParentNotSelected,
htmlAttributes != null
? HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes)
: new RouteValueDictionary(),
options));
}
public static MvcHtmlString CascadingDropDownList(
this HtmlHelper htmlHelper,
string inputName,
string inputId,
string triggeredByProperty,
string url,
string ajaxActionParamName,
string optionLabel = null,
bool disabledWhenParentNotSelected = false,
RouteValueDictionary htmlAttributes = null,
CascadeDropDownOptions options = null)
{
return(CascadingDropDownList(
htmlHelper,
inputName,
inputId,
triggeredByProperty,
url,
ajaxActionParamName,
GetPropStringValue(htmlHelper.ViewData.Model, inputName),
optionLabel,
disabledWhenParentNotSelected,
htmlAttributes,
options));
}
public static MvcHtmlString CascadingDropDownList <TModel, TProperty>(
this HtmlHelper <TModel> htmlHelper,
string inputName,
string inputId,
Expression <Func <TModel, TProperty> > triggeredByProperty,
string url,
string ajaxActionParamName,
string optionLabel = null,
bool disabledWhenParentNotSelected = false,
object htmlAttributes = null,
CascadeDropDownOptions options = null)
{
var triggeredByPropId = htmlHelper.GetElementIdFromExpression(triggeredByProperty);
if (string.IsNullOrEmpty(triggeredByPropId))
{
throw new ArgumentException("triggeredByProperty argument is invalid");
}
return(CascadingDropDownList(
htmlHelper,
inputName,
inputId,
triggeredByPropId,
url,
ajaxActionParamName,
optionLabel,
disabledWhenParentNotSelected,
htmlAttributes,
options));
}
public static MvcHtmlString CascadingDropDownList(
this HtmlHelper htmlHelper,
string inputName,
string inputId,
string triggeredByProperty,
string url,
string ajaxActionParamName,
string selectedValue,
string optionLabel = null,
bool disabledWhenParentNotSelected = false,
object htmlAttributes = null,
CascadeDropDownOptions options = null)
{
return(CascadingDropDownList(
htmlHelper,
inputName,
inputId,
triggeredByProperty,
url,
ajaxActionParamName,
selectedValue,
optionLabel,
disabledWhenParentNotSelected,
htmlAttributes != null
? HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes)
: new RouteValueDictionary(),
options));
}
public static MvcHtmlString CascadingDropDownList <TModel, TProperty>(
this HtmlHelper htmlHelper,
string inputName,
string inputId,
Expression <Func <TModel, TProperty> > triggeredByProperty,
string url,
string ajaxActionParamName,
string optionLabel = null,
bool disabledWhenParentNotSelected = false,
object htmlAttributes = null,
CascadeDropDownOptions options = null)
{
MemberInfo triggerMemberInfo = GetMemberInfo(triggeredByProperty);
if (triggerMemberInfo == null)
{
throw new ArgumentException("triggeredByProperty argument is invalid");
}
return(CascadingDropDownList(
htmlHelper,
inputName,
inputId,
triggerMemberInfo.Name,
url,
ajaxActionParamName,
optionLabel,
disabledWhenParentNotSelected,
htmlAttributes,
options));
}
private static MvcHtmlString CascadingDropDownList(
this HtmlHelper htmlHelper,
string inputName,
string cascadeDdElementId,
string triggeredByProperty,
string url,
string ajaxActionParamName,
string selectedValue,
string optionLabel = null,
bool disabledWhenParentNotSelected = false,
RouteValueDictionary htmlAttributes = null,
CascadeDropDownOptions options = null)
{
if (htmlAttributes == null)
{
htmlAttributes = new RouteValueDictionary();
}
htmlAttributes.Add("data-cascade-dd-url", url);
var setDisableString = string.Empty;
var removeDisabledString = string.Empty;
if (optionLabel != null)
{
htmlAttributes.Add("data-option-lbl", optionLabel);
}
if (disabledWhenParentNotSelected)
{
htmlAttributes.Add("disabled", "disabled");
setDisableString = "targetElement.setAttribute('disabled','disabled');";
removeDisabledString = "targetElement.removeAttribute('disabled');";
}
var defaultDropDownHtml = htmlHelper.DropDownList(
inputName,
new List <SelectListItem>(),
optionLabel,
htmlAttributes);
var scriptBuilder = new StringBuilder();
var optionLblStr = optionLabel == null ? "''" : string.Format(@"'<option value="""">{0}</option>'", optionLabel);
scriptBuilder.AppendFormat(Js1CreateInitFunction, cascadeDdElementId, triggeredByProperty, selectedValue, removeDisabledString, optionLblStr, setDisableString);
ApplyJsonToSendString(ref scriptBuilder, ajaxActionParamName, options);
ApplyRequestString(ref scriptBuilder, options);
ApplyOnLoadString(ref scriptBuilder, options);
ApplyErrorCallbackString(ref scriptBuilder, options);
ApplySendRequestString(ref scriptBuilder, options);
scriptBuilder.AppendFormat(Js7EndFormat, cascadeDdElementId);
var script = string.Concat("<script>", scriptBuilder.ToString(), "</script>");
return(new MvcHtmlString(string.Concat(defaultDropDownHtml.ToString(), Environment.NewLine, script)));
}
private static void ApplyErrorCallbackString(ref StringBuilder builder, CascadeDropDownOptions options)
{
var onComplete = string.Empty;
var onFailure = string.Empty;
if (options != null && (!string.IsNullOrEmpty(options.OnCompleteGetData) || !string.IsNullOrEmpty(options.OnFailureGetData)))
{
if (!string.IsNullOrEmpty(options.OnCompleteGetData))
{
onComplete = string.Format("{0}(null, request.responseText);", options.OnCompleteGetData);
}
if (!string.IsNullOrEmpty(options.OnSuccessGetData))
{
onFailure = string.Format("{0}(request.responseText, request.status, request.statusText);", options.OnFailureGetData);
}
builder.AppendFormat(Js5ErrorCallback, onComplete, onFailure);
}
}
public static MvcHtmlString CascadingDropDownListFor <TModel, TProperty, TProperty2>(
this HtmlHelper <TModel> htmlHelper,
Expression <Func <TModel, TProperty> > expression,
Expression <Func <TModel, TProperty2> > triggeredByProperty,
string url,
string ajaxActionParamName,
string optionLabel = null,
bool disabledWhenParentNotSelected = false,
object htmlAttributes = null,
CascadeDropDownOptions options = null)
{
var triggerMemberInfo = GetMemberInfo(triggeredByProperty);
var dropDownElement = GetMemberInfo(expression);
if (dropDownElement == null)
{
throw new ArgumentException("expression argument is invalid");
}
if (dropDownElement == null)
{
throw new ArgumentException("triggeredByProperty argument is invalid");
}
var dropDownElementName = dropDownElement.Name;
var dropDownElementId = GetDropDownElementId(htmlAttributes) ?? dropDownElement.Name;
return(CascadingDropDownList(htmlHelper,
dropDownElementName,
dropDownElementId,
triggerMemberInfo.Name,
url,
ajaxActionParamName,
GetPropStringValue(htmlHelper.ViewData.Model, expression),
optionLabel,
disabledWhenParentNotSelected,
htmlAttributes != null
? HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes)
: new RouteValueDictionary(),
options));
}
private static void ApplyOnLoadString(ref StringBuilder builder, CascadeDropDownOptions options)
{
var onComplete = string.Empty;
var onSuccess = string.Empty;
var onFailure = string.Empty;
if (options != null)
{
if (!string.IsNullOrEmpty(options.OnCompleteGetData))
{
onComplete = string.Format("{0}(data, null);", options.OnCompleteGetData);
}
if (!string.IsNullOrEmpty(options.OnSuccessGetData))
{
onSuccess = string.Format("{0}(data);", options.OnSuccessGetData);
}
if (!string.IsNullOrEmpty(options.OnFailureGetData))
{
onFailure = string.Format("{0}(request.responseText, request.status, request.statusText);", options.OnFailureGetData);
}
}
builder.AppendFormat(Js4OnLoadFormat, onComplete, onSuccess, onFailure);
}
private static void ApplySendRequestString(ref StringBuilder builder, CascadeDropDownOptions options)
{
builder.Append(options == null || options.HttpMethod == null || !options.HttpMethod.Equals("POST", StringComparison.OrdinalIgnoreCase) ?
Js6SendGetRequest : Js6SendPostRequest);
}
private static void ApplyJsonToSendString(ref StringBuilder builder, string ajaxParam, CascadeDropDownOptions options)
{
builder.Append(options == null || string.IsNullOrEmpty(options.BeforeSend) ?
string.Format(Js2SimpleGenerateJsonToSendFormat, ajaxParam) :
string.Format(Js2GenerateJsonToSendFromFunctionFormat, options.BeforeSend, ajaxParam));
}
