Html attributes for EditorFor() in ASP.NET MVC

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byAnton Shumikhin·Sep 26, 2024

Quickly add HTML attributes to your EditorFor() with a clear-cut anonymous object:

@Html.EditorFor(model => model.Field, new { htmlAttributes = new { @class = "form-control", placeholder = "Enter Value" } })

This method binds the class and placeholder HTML attributes to your MVC field, rendering it with specific styles and placeholders.

Utilizing MVC 5.1: Passing HTML Attributes and Additional Data

In MVC 5.1, you have the capacity to pass additional view data and HTML attributes straight into EditorFor(). This upgrade paves the way for dynamic and complex view logic in your editor templates.

Transporting additional data to your editor templates

You can add supplementary data to EditorFor(). This can then be accessed in a custom editor template using ViewData.

@Html.EditorFor(model => model.Field, null, new { htmlAttributes = new { @class = "form-control" }, additionalViewData = new { Readonly = "readonly" } })

Creating dynamic HTML attributes with ViewData

In custom editor templates, use ViewData for programming dynamic HTML attributes like readonly or disabled.

@{
    var readonlyAttribute = ViewData["Readonly"]?.ToString();
    var htmlAttributes = new Dictionary<string, object>
    {
        { "class", "form-control" }
    };
    if (!String.IsNullOrEmpty(readonlyAttribute))
    {
        // No readonly, no party! Just kidding, it just ensures the field is read-only.
        htmlAttributes.Add("readonly", readonlyAttribute);
    }
    @Html.TextBoxFor(model => model, htmlAttributes)
}

Enhanced form editing: Custom Templates and Leveraging Metadata

Harnessing browser-rendered metadata

EditorFor() can utilize user-interface metadata to determine how a field will be displayed:

[Display(Name = "Email Address")]
[DataType(DataType.EmailAddress)]
public string Email { get; set; }

Editor templates tailor the HTML rendering based on this metadata.

TextBoxFor: Your HTML attribute sidekick

For granular control over the HTML attributes, TextBoxFor can be used in a custom editor template to define the specific attributes:

@Html.TextBoxFor(model => model, new { @class = "Be_the_hero", data_custom="Win!" })

Comment: Be the hero of your code! Every attribute you define brings you closer to winning.

Common mistakes: Syntax issues

Syntax correctness is crucial for attribute passing in ASP.NET MVC. Different language-specific implementations can be remembered using syntax comparisons.

@Html.EditorFor(model => model.Field, new { htmlAttributes = new { @class = "form-control" } } )  //C#

@Html.EditorFor(Function(model) model.Field, New With {.htmlAttributes = New With {.class = "form-control"}})  //VB.NET