Password HTML Helper in ASP.NET Core MVC

Password HTML Helper in ASP.NET Core MVC

In this article, I will discuss How to Use Password Field HTML Helper in ASP.NET Core MVC Application to Generate Password Fields with Examples. Please read our previous article, where we discussed How to Use Editor HTML Helper in ASP.NET Core MVC Application.

What is Password Input Filed in Web Application?

A password input field in a web application is a type of form field specifically designed for users to input their passwords securely. In HTML, the input element with the type attribute set to “password” is used to create a password input field. When users type their passwords into this field, the characters are usually masked (often displayed as asterisks or dots) to prevent anyone nearby from seeing the password. This helps protect the confidentiality of the user’s login credentials.

When a user submits the form containing the password input field, the password value is typically transmitted securely over HTTPS to the server for authentication. Additionally, web developers often employ techniques like hashing and salting to secure further passwords stored on the server side. This type of input field is specifically designed for users to securely enter sensitive information, such as passwords, PIN codes, or other confidential data. Here’s the basic structure of a password input field in HTML:

<label for="password">Password:</label>
<input type="password" id="password" name="password">

In this example:

  • <label for=”password”>Password:</label>: This is a label element that is associated with the password input field. It helps improve accessibility by providing a text description for the input.
  • <input type=”password” id=”password” name=”password”>: This is the password input field itself. The type attribute is set to “password”, which specifies that it should behave as a password input. The id attribute associates the input with the label, and the name attribute is used to identify the field when the form is submitted.

The key feature of a password input field is its ability to mask the entered characters to enhance security. This helps protect sensitive information from being easily visible to others, especially when entered on shared or public computers. When the form containing the password input is submitted, the entered value is sent to the server like any other form input, and it’s the server’s responsibility to handle and store passwords securely.

How Do We Create Password Filed Using HTML Helper in ASP.NET Core MVC?

To create a Password Input Field, i.e., <input type=”password”> using HTML Helpers in ASP.NET Core MVC, we must use Password or PasswordFor methods within our Razor views. Html.Password is used to manually specify the model property to bind to, while Html.PasswordFor uses a lambda expression to identify the property on the model.

The Password method is used when you manually specify the form field’s name, while PasswordFor is used with model properties, providing a strongly typed approach. That means the Password() HTML Helper method is loosely typed, whereas the PasswordFor() HTML Helper method is strongly typed.

What is the Password HTML Helper Method in ASP.NET Core MVC?

The Html.Password() HTML Helper method in ASP.NET Core MVC generates an input password element with a specified name, value, and HTML attributes. This helper method simplifies the process of creating password input fields and ensures that the generated HTML adheres to best practices and security measures. Two overloaded Password() Helper Method versions are available as follows.

IHtmlContent Password(this IHtmlHelper htmlHelper, string expression)
IHtmlContent Password(this IHtmlHelper htmlHelper, string expression, object value)

Let us see an example of understanding Password HTML Helper in ASP.NET Core MVC. First, create a class file named LoginModel.cs and copy and paste the following code into it.

namespace HTML_HELPER.Models
{
    public class LoginModel
    {
        public int LoginId { get; set; }
        public string? loginName { get; set; }
        public string? LoginPassword { get; set; }
    }
}

Next, modify the HomeController as follows:

using Microsoft.AspNetCore.Mvc;
namespace HTML_HELPER.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }
    }
}

Next, modify the Index.cshtml file as follows:

@model HTML_HELPER.Models.LoginModel
@{
    Layout = null;
}
@Html.Password("LoginPassword")

Run the application and inspect the HTML for the password field text box. It will generate the following HTML for the Password field.

<input id="LoginPassword" name="LoginPassword" type="password" />
PasswordFor() HTML Helper Method in ASP.NET Core MVC:

The PasswordFor() HTML helper method is the strongly typed extension method. In ASP.NET Core MVC, Html.PasswordFor() is an HTML Helper method used to render an HTML input element of type “password” for a specified model property. It is typically used within a form to provide a field for users to enter a password securely.

Syntax: @Html.PasswordFor(expression, htmlAttributes)
Parameters:

  • expression: A lambda expression that identifies the model property to which the password input field is bound.
  • htmlAttributes: An object that contains HTML attributes to be included in the rendered input element. These attributes can be specified as an anonymous object.

Let us understand this with an example. Please modify the Index.cshtml file as shown below.

@model HTML_HELPER.Models.LoginModel
@{
    Layout = null;
}
@Html.PasswordFor(m => m.LoginPassword)

It will generate the following HTML Code.

<input id="LoginPassword" name="LoginPassword" type="password">

In the above example, the first parameter of the PasswordFor() helper method is a lambda expression that specifies the model property to be bound with the password field textbox.

Customizing the Password Input:

You can customize the behavior and appearance of the password input by passing attributes to the PasswordFor method. For example, modify the Index.cshtml file as follows:

@model HTML_HELPER.Models.LoginModel
@Html.PasswordFor(m => m.LoginPassword, new { @class = "form-control", placeholder = "Enter your password" })

Here:

  • @Html.PasswordFor(m => m.Password): This generates a password input field bound to the Password property in the model. The value entered by the user will be assigned to the Password property when the form is submitted.
  • @class = “form-control”: This is an example of adding a CSS class to the password input for styling purposes.
  • placeholder = “Enter your password”: This adds a placeholder text that is displayed in the input field before the user enters their password.

Validation and Model Binding: The PasswordFor method supports validation and model binding like other HTML Helper methods. When the form is submitted, the entered password is bound to the specified property in the model.

When Should We Use Password HTML Helper Method in ASP.NET Core MVC?

The Password HTML Helper method in ASP.NET Core MVC should be used whenever you need to create a password input field within a form. Password input fields are commonly used when you want users to securely enter passwords or other sensitive information, such as PIN codes or confidential data. The Password HTML Helper method helps mask user input to protect sensitive information from being easily visible on the screen.

Here are some scenarios where you should consider using the Password HTML Helper method:

  • User Registration and Authentication: When users are registering for an account or logging in, you’ll typically use password input fields to collect their passwords securely. The password input field helps ensure that passwords are not easily readable while being entered.
  • Change Password Forms: If your application has a feature that allows users to change their passwords, you should use the Password HTML Helper to create the password input field for the new password.
  • Secure Data Collection: Whenever you need users to input sensitive information, such as credit card details, PIN codes, or any confidential data, you should use the Password HTML Helper to create the input field. This ensures the input is hidden and masked to prevent unauthorized users from viewing it.
  • Password Reset Forms: When implementing a “forgot password” functionality, the Password HTML Helper is used to create the input field where users enter their new passwords.
  • Admin Panels and User Management: In admin panels or user management sections, password input fields are used when creating or updating user accounts.
  • Any Form Requiring Confidential Information: Any form that collects confidential or sensitive information should use the Password HTML Helper method to ensure the privacy and security of the input.
What are the Differences Between Password and PasswordFor in ASP.NET Core MVC?

In ASP.NET Core MVC, Password and PasswordFor are HTML Helper methods used to render input fields for password input in forms. However, they have different usage scenarios and purposes:

Password Helper:
  • This helper method is used to render a plain HTML <input> element of the type password.
  • It does not bind directly to a model property. Instead, it simply renders an HTML <input type=”password”> element.
  • It’s useful when you need a simple password input field without binding it to a specific model property.
  • Example: @Html.Password(“Password”, null, new { @class = “form-control” })
PasswordFor Helper:
  • This helper method is used to render a password input field that is bound to a specific model property.
  • It binds directly to a property of the model specified in the lambda expression.
  • It’s useful when you want to create a password input field that automatically binds its value to a property of the model when the form is submitted.
  • Example: @Html.PasswordFor(model => model.Password, new { @class = “form-control” })

So, the main difference between Password and PasswordFor is that PasswordFor is used when you want to bind the password input field to a specific property of a model, while Password is used for creating a simple password input field without binding it to a model property.

In the next article, I will discuss Hidden Field HTML Helper in the ASP.NET Core MVC Application. I explain Password Field HTML Helper in the ASP.NET Core MVC Application with Examples in this article. I hope this article will help you with your needs.

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