TypeScript Lab: Input Naming Assist

LAB / EXPLORATION

TypeScript Lab: Input Naming Assist

Planned

LAB 079 — Semantic HTML
Use available placeholder text when a control lacks an accessible name.

LAB TypeScript Lab: Input Naming Assist Preview coming soon

LAB 079

TypeScript Lab: Input Naming Assist

Concept

DOM checks can identify unnamed controls while preserving explicit accessible naming.

Concept

DOM checks can identify unnamed controls while preserving explicit accessible naming.

Objective & Explanation

What the project should make visible and why the concept matters.

Learning Target

Objective

Use available placeholder text when a control lacks an accessible name.

Explanation

DOM checks can identify unnamed controls while preserving explicit accessible naming.

Project Plan

Structure, technologies, data boundary, and source connection.

Structure

project/
├── package.json
├── tsconfig.json
├── index.html
├── styles.css
└── src/
    └── app.ts

Technologies

TypeScript
DOM
HTML
CSS

Data Layer

No persistent data layer. Keep all demonstration values inside the standalone project.

Sandbox Source

src/local-editor/client.ts → semanticAssistHtml()

Build Instructions

Build only the focused behavior, then use the visual layer to inspect it.

Setup

Create the standalone project folder and listed files.

Implement

Implement the smallest version that demonstrates the concept.

Run & Inspect

Change one input and observe the visible output change.

Code & Configuration

Starter configuration plus the focused implementation example.

Focused TypeScript

Implement this behavior first, then alter the input.

document.querySelectorAll("input, select, textarea").forEach(control => {
  const placeholder = control.getAttribute("placeholder")?.trim();

  if (placeholder && !control.hasAttribute("aria-label")) {
    control.setAttribute("aria-label", placeholder);
  }
});

Starter Configuration

Keep the project independently buildable.

package.json

{
  "type": "module",
  "scripts": { "build": "tsc" },
  "devDependencies": { "typescript": "^7.0.2" }
}

tsconfig.json

{
  "compilerOptions": {
    "rootDir": "./src",
    "outDir": "./dist",
    "target": "ES2022",
    "module": "ES2022",
    "lib": ["ES2022", "DOM"],
    "strict": true,
    "sourceMap": true
  },
  "include": ["src/**/*.ts"]
}

Expected Visual Result

The output is the proof that the concept is working.

Visible Proof

The browser should visibly demonstrate: use available placeholder text when a control lacks an accessible name.

Data: None