TypeScript Lab: Safe Button Type

LAB / EXPLORATION

TypeScript Lab: Safe Button Type

Planned

LAB 074 — Semantic HTML
Add type=button only when a button has no explicit type.

LAB TypeScript Lab: Safe Button Type Preview coming soon

LAB 074

TypeScript Lab: Safe Button Type

Concept

Semantic repair can prevent accidental form submission while preserving authored attributes.

Concept

Semantic repair can prevent accidental form submission while preserving authored attributes.

Objective & Explanation

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

Learning Target

Objective

Add type=button only when a button has no explicit type.

Explanation

Semantic repair can prevent accidental form submission while preserving authored attributes.

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("button").forEach(button => {
  if (!button.hasAttribute("type")) {
    button.setAttribute("type", "button");
  }
});

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: add type=button only when a button has no explicit type.

Data: None