Introduction
How many times did you wonder how to avoid writing the same chunk of HTML / JavaScript code many times in an MVC Razor view? What if this repetitive task includes some logic?
The solution to avoid this is to build a custom HTML helper to encapsulate everything and make the repetitive task less cumbersome.
Let's say we want to avoid doing this many times inside your views:
<img src="@myModel.MyObject.ImageSource", alt ="@myModel.MyObject.Imagename",
title ="@myModel.MyObject.ImageDescription" />
And instead, you want something Razor like that may take care of some logic or validations to avoid error because in the previous snippet, the ImageSource
or Imagename
or again the description may be null
:
@Html.Image(@myModel.MyObject.ImageSource,
@myModel.MyObject.Imagename, @myModel.MyObject.ImageDescription)
namespace MyNamespace
{
public static class MyHeleprs
{
public static MvcHtmlString Image(this HtmlHelper htmlHelper,
string source, string alternativeText)
{
var builder = new TagBuilder("image");
builder.MergeAttribute("src", source);
builder.MergeAttribute("alt", alternativeText);
return MvcHtmlString.Create(builder.ToString(TagRenderMode.SelfClosing));
}
}
}
To make this helper available in your view, add its namespace
as follows:
@namespace MyNamespace
But if you want it available in all your views, you have to add the namespace
not to a specific view but to the collection of namespace
s in views' web.config:
<add namespace="MyNamespace" />
Now, the Image
helper is available everywhere in your views.