Archive for the ‘Code Snippet’ Category.
According to Response Time overview, the response time for JavaScript code to execeute should be no more than 0.1 seconds (100 milliseconds). Especially on JavaScript/Ajax heavy sites this can be a problem. That’s why it is always good thing to check the performance of your code.
To measure your JavaScript you can use the code below:
function somefunction() {
var start = new Date().getMilliseconds();
// code here
var stop = new Date().getMilliseconds();
var executionTime = stop - start;
console.log("Execution time " + executionTime +
" milliseconds"); // or alert("Execution time " + executionTime + " milliseconds");
}Note that Firebug for Firefox also has a code profiler which does the same thing. To use it install Firebug, enable firebug (f12), activate the console window, press the profile button, refresh the page, click the profile button again (more information: Firebug JavaScript Debugger and Profiler).
Here are some EPiServer extension methods I use in my projects (remember that you need to use .NET 3.5 or later).
Update
These, and more have been added to the EPiServer World Community project EPiCode.Extensions on EPiCode. Be sure to check it out!
IsValue
public static bool IsValue(this PageData page, string propertyName)
{
var propertyData = page.Property[propertyName];
return (propertyData != null && !propertyData.IsNull);
}We can now use it on every PageData object.
// using MyNamespace;
if (eventPage.IsValue("Heading"))
{
ltlEventHeading.Text = eventPage["Heading"].ToWebString();
}IsPublished
public static bool IsPublished(this PageData page)
{
return page.StopPublish > DateTime.Now && page.StartPublish < DateTime.Now;
}Or better yet, taken from the EPiServer.dll:
public static bool IsPublished(this PageData page)
{
return CheckPublishedStatus(page, PagePublishedStatus.Published);
}
private static bool CheckPublishedStatus(this PageData page, PagePublishedStatus status)
{
if (status != PagePublishedStatus.Ignore)
{
if (page.PendingPublish)
{
return false;
}
if (page.Status != VersionStatus.Published)
{
return false;
}
if ((status >= PagePublishedStatus.PublishedIgnoreStopPublish) && (page.StartPublish > Context.Current.RequestTime))
{
return false;
}
if ((status >= PagePublishedStatus.Published) && (page.StopPublish < Context.Current.RequestTime))
{
return false;
}
}
return true;
}Heading
public static string Heading(this PageData page)
{
if (page.IsValue("Heading"))
{
return page["Heading"].ToWebString();
}
return page.PageName.ToWebString();
}ToWebString (from EPiServer.dll using reflector)
public static string ToWebString(this object obj)
{
string[] parsedUISafeHtmlTags = ParsedUISafeHtmlTags;
string input = obj.ToString().Replace("&", "&").Replace("<", "<").Replace(">", ">");
if (((parsedUISafeHtmlTags != null) && (parsedUISafeHtmlTags.Length != 0)) && ((parsedUISafeHtmlTags.Length != 1) || (parsedUISafeHtmlTags[0].Length != 0)))
{
// using System.Text.RegularExpressions;
return Regex.Replace(input, BuildRegularExpression(parsedUISafeHtmlTags), "<$1>", RegexOptions.IgnoreCase);
}
return input;
}
private static string BuildRegularExpression(string[] safeTags)
{
return ("<(/?(" + string.Join("|", safeTags) + @")/?\s*)>");
}
private static string[] ParsedUISafeHtmlTags
{
get
{
// using EPiServer.Configuration;
string uISafeHtmlTags = Settings.Instance.UISafeHtmlTags;
if (!string.IsNullOrEmpty(uISafeHtmlTags))
{
return uISafeHtmlTags.Split(new char[] { ',' });
}
return new string[0];
}
}
This is a little code snippet for when you need to cast a nullable type to its value type.
if (startPage.ShowMainFeatured.HasValue)
{
// Safe to cast
if ((bool) startPage.ShowMainFeatured)
{
mainfeatured.Visible = true;
}
}
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