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ASP.NET MVC HTML Helpers


ASP.NET MVC HTML Helpers

What are Html Helpers?

An HTML Helper is simply a method that returns a HTML string. The string can represent any type of content that you want. For example, you can use HTML Helpers to render standard HTML tags like HTML <input>, <button> and <img> tags etc.
                 
Helper class can create HTML controls programmatically. HTML Helpers are used in View to render HTML content. It is not mandatory to use HTML Helper classes for building an ASP.NET MVC application, but HTML Helpers helps in the rapid development of a view.

You can also create your own HTML Helpers to render more complex content such as a menu strip or an HTML table for displaying database data.

Categories of HTML Helpers?


1.     Built-in HTML Helpers
2.     Inline HTML Helpers
3.     Custom HTML Helpers

Built-in HTML Helpers are also categorized into three, these are;

a.     Standard HTML Helpers
b.     Strongly typed HTML Helpers
c.      Templated HTML Helpers

Standard HTML Helpers


Standard HTML Helpers are used to render the most common type of HTML controls like TextBox, DropDown, Radio buttons, Checkbox etc. Extension methods of HTML Helper classes have several overloaded versions. We can use any one according to our requirement. Let’s see some of the Standard HTML Helpers:

Form


This HTML Helper is used for creating form element, BeginForm and EndForm extension methods are mostly used for HTML form rendering.



From the above image, we can see that the form helper syntax as @HTML.BeginForm() with some arguments such as action method (Create), Controller (Documents), Form method (POST). It is enclosed in the using statement because it implements IDisposable interface.

Label

The Label method of HTML helper can be used for generating label element. Label extension method have 6 overloaded versions.


TextBox


The TextBox Helper method renders a textbox in View that has a specified name. We can also add attributes like class, placeholder etc. with the help of overloaded method in which we have to pass objects of HTML Attributes.


DropDownList


The DropDownList helper renders a drop down list.


Strongly Typed HTML Helpers

Strongly typed helpers are helpers that require lambda expression and strongly typed views as we can see below. Just like Standard Helper, we have several strongly typed methods.
Html.TextBoxFor(), Html.TextAreaFor(), Html.DropDownListFor(), Html.CheckboxFor(), Html.RadioButtonFor(), Html.ListBoxFor(), Html.PasswordFor(), Html.HiddenFor(), Html.LabelFor(), etc.


Template HTML Helpers

These methods are very flexible and generate the HTML element based on the properties of the model class.
The example of these helpers can be seen in the application we built in our previous articles where we scaffold our controller thereby creating action methods and views for us as can be seen below.

Inline HTML Helpers


These are create in the same view by using the Razor @helper tag. These helpers can be reused only on the same view. This is as shown below
 

Custom HTML Helpers

You can also create your own custom helper methods by creating an extension method on the HtmlHelper class or by creating static methods with in a utility class as shown below


Thank you


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