EPi.Extensions is library with useful extension methods and helpers for EPiServer.
Start by installing NuGet package (use EPiServer NuGet):
Install-Package Geta.EPi.Extensions
See reference and examples below.
You can use the GetChildren and GetPage extension methods to easily fetch pages. They also have generic overloads.
var startPage = ContentReference.StartPage.GetPage<StartPage>();
var sections = ContentReference.StartPage.GetChildren<SectionPage>();
You can use FilterForDisplay to easily filter out pages that the user shouldn't see. Here is an example of how to filter child pages of start page.
var childPages = ContentReference.StartPage.GetChildren().FilterForDisplay();
MenuList extension method helps to build menus. Extension method requires two parameters - ContentReference of the menu root page and @helper which generates menu item. MenuList uses FilterForDisplay extension method to filter out pages that the user doesn't have access to, are not published and are not visible in menu and that don't have a template.
MenuList extension method has three optional parameters:
- includeRoot - flag which indicates if root page should be included in menu (default is false)
- requireVisibleInMenu - flag which indicates if pages should be included only when their property VisibleInMenu is true (default is true)
- requirePageTemplate - flag which indicates if pages should have templates
Below is an example how menu can be created for pages under start page.
@helper MenuItemTemplate(MenuItem item)
{
<li class="@(item.Selected ? "active" : null)">
@Html.PageLink(item.Page)
</li>
}
<nav id="main-nav" class="navigation" role="navigation">
<ul class="nav">
@Html.MenuList(ContentReference.StartPage, MenuItemTemplate)
</ul>
</nav>
MenuList creates the list only for one level. For multiple menu levels use MenuList extension in menu item template to generate sub-levels.
@helper SubMenuItemTemplate(MenuItem item)
{
<li class="@(item.Selected ? "active" : null)">
@Html.PageLink(item.Page)
</li>
}
@helper MenuItemTemplate(MenuItem item)
{
<li class="@(item.Selected ? "active" : null)">
@Html.PageLink(item.Page)
<ul>
@Html.MenuList(item.Page.ContentLink, SubMenuItemTemplate)
</ul>
</li>
}
<nav id="main-nav" class="navigation" role="navigation">
<ul class="nav">
@Html.MenuList(ContentReference.StartPage, MenuItemTemplate)
</ul>
</nav>
Example of a custom DisplayTemplate for XForm using the XFormHelper to clean up the markup.
@using EPiServer.HtmlParsing
@using EPiServer.Web.Mvc.Html
@using Geta.EPi.Cms.Helpers
@model EPiServer.XForms.XForm
@if (ViewData["XFormActionResult"] is EPiServer.Web.Mvc.XForms.XFormSuccessActionResult)
{
<strong>Form posted.</strong>
}
else
{
using (Html.BeginXForm(Model, htmlAttributes: new { @class = "form xform" }))
{
if (Model != null)
{
foreach (HtmlFragment fragment in (IEnumerable<HtmlFragment>)ViewData["XFormFragments"] ?? Model.CreateHtmlFragments())
{
@Html.Fragment(XFormHelper.CleanupXFormHtmlMarkup(fragment))
}
}
}
}
Markup would look something like this:
<form action="" class="form xform" method="post">
<div id="id_matrix" class="xform-table">
<div class="xform-body">
<div class="xform-row">
<div class="xform-col">
<label for="Input_54330581">
Navn
</label>
<input id="Input_54330581" name="Navn" size="70" type="text" value="" />
</div>
</div><div class="xform-row">
<div class="xform-col">
<label for="Input_54330581">
Epost
</label>
<input id="Input_54330581" name="Epost" size="70" type="text" value="" />
</div>
</div>
</div>
</div>
</form>
Here we have an example of using QueryStringBuilder to build a filter URL. This can be useful for lists that have filter functionality or sort functionality. To instantiate QueryStringBuilder UrlHelper extensions are used.
<a href="@Url.QueryBuilder(Request.RawUrl).Toggle("sort", "alphabet")">A-Å</a>
Output when URL is: /list
<a href="/list?sort=alphabet">A-Å</a>
Output when URL is: /list?sort=alphabet
<a href="/list">A-Å</a>
Here is an example of using QueryStringBuilder to add a segment to a EPiServer page URL. This can be useful for forms if you want to post to a page controller action.
<form action="@Url.QueryBuilder(Model.CurrentPage.ContentLink).AddSegment("MyActionName")"></form>
Output when page URL is: /about-us
<form action="/about-us/MyActionName"></form>
We have included a simple validation helper for validating email address' using .NET's built in email validation (which updates together with newer versions/patches for .NET).
bool isValidEmail = ValidationHelper.IsValidEmail("test@example.com");
If you have enum values you want to use in your content types you can use the EnumAttribute to decorate your properties. The values can also be localized.
[BackingType(typeof(PropertyNumber))]
[EnumAttribute(typeof(Priority))]
public virtual Priority Priority { get; set; }
Credits: http://world.episerver.com/Blogs/Linus-Ekstrom/Dates/2014/5/Enum-properties-for-EPiServer-75/
You can easily get the child categories of any root category you like (as long as you have it's ID).
IEnumerable<Category> categories = Category.GetRoot().ID.GetChildCategories();
When you have a CategoryList and want to get strongly typed Category objects back you can use the GetFullCategories() method.
IEnumerable<Category> categories = CurrentPage.Category.GetFullCategories();
If you need to check if the CategoryList has that category you can use the Contains() method.
bool hasBikes = CurrentPage.Category.Contains("bikes");
This can be useful when used together with sharing widgets.
string fullUrl = CurrentPage.GetFriendlyUrl();
Allows easily load the page which is a single instance of a type.
Loading the singleton page of a type by a parent ContentReference.
var testPage1 = ContentReference.StartPage.GetSingletonPage<TestPage>();
Loading the singleton page of a type by a parent page.
var startPage = _contentLoader.Get<StartPage>(ContentReference.StartPage);
var testPage2 = startPage.GetSingletonPage<TestPage>();