StaticTextAreaTagHelper

Inherits: TagHelper HTML Target: <textarea>

StaticTextAreaTagHelper is the tag helper that powers static-for on <textarea> elements. It mirrors StaticInputTagHelper but is locked to string model properties.

This tag helper is used declaratively — apply the static-for attribute on a <textarea> inside a Razor template for a component inheriting from StaticInput.

Namespace

TechGems.StaticComponents.Headless.TagHelpers

HTML Target Element

<textarea static-for="@Model.InputExpression"></textarea>

Usage

@model PinesTextArea

<textarea static-for="@Model.InputExpression"
          disabled="@(Model.Disabled ? "disabled" : null)"
          class="…"></textarea>

Public Properties

`InputExpression`

[HtmlAttributeName("static-for")]
public ModelExpression InputExpression { get; set; }

The outer ModelExpression — its .ModelExplorer.Model is expected to be another ModelExpression bound to the consumer’s string property.

`Type`

[HtmlAttributeName("type")]
public string? Type { get; set; } = null;

Reserved for future use. Currently unused by the tag helper.

Supported Model Types

Only string. Any other type throws ArgumentException.

Behavior

When processed, the tag helper:

Validates the inner model type is string (throws otherwise).
Sets name, id and the data-val-* attributes through StaticHeadlessUtils.
Populates a value attribute from the model value when no explicit value was authored.

Error Conditions

Condition	Exception
Inner property is not `string`	`ArgumentException`

Headless Components — Feature guide.
StaticInput
StaticInputTagHelper — same model for <input>.