TypeScript Lab: Move Node Up and Down

LAB / EXPLORATION

TypeScript Lab: Move Node Up and Down

Planned

LAB 101 — Tree Structures
Swap ordered sibling positions with visible arrow controls.

LAB TypeScript Lab: Move Node Up and Down Preview coming soon

LAB 101

TypeScript Lab: Move Node Up and Down

Concept

Reordering changes stored sort values while preserving parent relationships.

Concept

Reordering changes stored sort values while preserving parent relationships.

Objective & Explanation

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

Learning Target

Objective

Swap ordered sibling positions with visible arrow controls.

Explanation

Reordering changes stored sort values while preserving parent relationships.

Project Plan

Structure, technologies, data boundary, and source connection.

Structure

project/
├── package.json
├── tsconfig.json
├── index.html
├── styles.css
├── data/
│   └── learning.db
└── src/
    ├── client.ts
    └── server.ts

Technologies

TypeScript
Node.js
SQLite
HTML
CSS

Data Layer

Use SQLite learning rows. Isolate destructive practice from important Sandbox records.

Sandbox Source

src/local-editor/server.ts → reorderNode()

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

Render the returned or changed data in the browser.

Code & Configuration

Starter configuration plus the focused implementation example.

Focused TypeScript

Implement this behavior first, then alter the input.

const current = siblings[index];
const target = siblings[index - 1];

database.prepare("UPDATE content_nodes SET sort_order = ? WHERE id = ?")
  .run(target.sort_order, current.id);

database.prepare("UPDATE content_nodes SET sort_order = ? WHERE id = ?")
  .run(current.sort_order, target.id);

Starter Configuration

Keep the project independently buildable.

package.json

{
  "type": "module",
  "scripts": {
    "build": "tsc",
    "start": "npm run build && node --enable-source-maps dist/server.js"
  },
  "devDependencies": {
    "@types/node": "^26.4.0",
    "typescript": "^7.0.2"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "rootDir": "./src",
    "outDir": "./dist",
    "target": "ES2022",
    "module": "ES2022",
    "lib": ["ES2022", "DOM"],
    "types": ["node"],
    "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: swap ordered sibling positions with visible arrow controls.

Data: SQLite