/// <summary>
/// Raises the PreRender event.
/// </summary>
/// <param name="e">
/// An EventArgs object that contains the event data.
/// </param>
/// <remarks>
/// <para>
/// This method notifies the server control to perform any necessary prerendering
/// steps prior to saving view state and rendering content.
/// Registers client side dynamic scripts for the Picker control.
/// Page code behind should not change Picker.PickerFormat after PreRender (e.g. PrerenderComplete)
/// ClientScript validation would hold different format than Picker.Value .
/// </para>
/// <para>
/// ClientScript registration is made here because is the last useful life cycle phase to register
/// client script resources. Array declaration is made here too to not duplicate the
/// ClientScriptManager object declaration.
/// </para>
/// <para>
/// Array declaration is made in Picker instead of the adapter because m_Format.Months is not
/// visible for protection level and we don't want to make it visible.
/// Besides, array name is made unambiguous in case of different instances of Picker have
/// different formats (LongMonthdate, ShortMonthDate).
/// </para>
/// </remarks>
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
const string clientScriptPath = "AutoComplete.Scripts.IM.AutoComplete.js";
const string jqueryScriptPath = "AutoComplete.Scripts.jquery.js";
const string jqueryUIScriptPath = "AutoComplete.Scripts.jquery-ui.js";
if (Enabled)
{
ClientScriptManager clientScriptManager = Page.ClientScript;
clientScriptManager.RegisterClientScriptResource(GetType(), clientScriptPath);
if (RegisterJQueryAndJQueryUI)
{
clientScriptManager.RegisterClientScriptResource(GetType(), jqueryScriptPath);
clientScriptManager.RegisterClientScriptResource(GetType(), jqueryUIScriptPath);
}
if (RegisterDefaultStyleSheet)
{
AddDefaultStyleSheet();
}
AutoCompleteSettingsDto settings = AutoCompleteSettingsMapper.GetDtoFrom(this);
string initializeAutoComplete = AutoCompleteInitializer.GetJsInitialization(settings);
Type controlType = GetType();
string scriptName = "autoComplete" + ClientID;
if (!clientScriptManager.IsStartupScriptRegistered(controlType, scriptName))
{
clientScriptManager.RegisterStartupScript(controlType, scriptName, initializeAutoComplete, true);
}
}
}
private static string GetInitializeAutoCompleteScript(HtmlHelper htmlHelper, string name,
Uri url, string labelField, string valueField,
int minChars, string selectionCallback, string errorCallback,
string errorMessage, string noResultsMessage, HttpMethod httpMethod)
{
const string defaultMessage = "A value must be provided for the specified argument.";
if (string.IsNullOrEmpty(name))
{
throw new ArgumentException(string.Format("Required argument: name.\r\n{0}", defaultMessage));
}
string fullName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
if (string.IsNullOrEmpty(fullName))
{
throw new ArgumentException(string.Format("Required argument: fullName.\r\n{0}", defaultMessage));
}
if (url == null)
{
throw new ArgumentException(string.Format("Required argument: url for: {0}\r\n{1}", name, defaultMessage));
}
if (string.IsNullOrEmpty(url.OriginalString))
{
throw new ArgumentException(string.Format("Required argument: url for: {0}\r\n{1}", name, defaultMessage));
}
if (string.IsNullOrEmpty(valueField))
{
throw new ArgumentException(string.Format("Required argument: valueField for: {0}\r\n{1}", name, defaultMessage));
}
string controlId = fullName;
string absoluteUrl = UrlHelper.GenerateContentUrl(url.ToString(), htmlHelper.ViewContext.HttpContext);
// script with the invocation of InitializeAutocComplete on the rendered TextBox
TagBuilder scriptTagBuilder = new TagBuilder("script");
scriptTagBuilder.MergeAttribute("type", "text/javascript");
AutoCompleteSettingsDto settings = AutoCompleteSettingsMapper.GetDtoFrom
(controlId,
new Uri(absoluteUrl, UriKind.RelativeOrAbsolute),
httpMethod,
minChars,
labelField,
valueField,
selectionCallback,
errorCallback,
errorMessage,
noResultsMessage);
string initializeAutoComplete = AutoCompleteInitializer.GetJsInitialization(settings);
scriptTagBuilder.InnerHtml = initializeAutoComplete;
return(scriptTagBuilder.ToString(TagRenderMode.Normal));
}