On-Page JavaScript Console.

ChatGPT:

Creating a simple on-page JavaScript console or REPL can be achieved with a combination of HTML, CSS, and JavaScript. You can use localStorage to maintain state between sessions. Here's a basic implementation that you can use as a starting point and modify to fit your needs:

First, create the HTML structure for your on-page console:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>On-Page JavaScript Console</title>
    <style>
        /* Add your CSS styles here */
    </style>
</head>
<body>
    <div id="console">
        <div id="output"></div>
        <form id="input-form">
            <input type="text" id="input" autocomplete="off" autofocus>
        </form>
    </div>
    <script>
        // Add your JavaScript code here
    </script>
</body>
</html>

Add some basic CSS styles:

body {
    font-family: monospace;
    background-color: #282a36;
    color: #f8f8f2;
}

#console {
    display: flex;
    flex-direction: column;
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
}

#output {
    flex: 1;
    overflow-y: auto;
}

#input-form {
    display: flex;
}

#input {
    flex: 1;
    background-color: #44475a;
    border: none;
    border-radius: 4px;
    color: #f8f8f2;
    padding: 0.5rem;
    outline: none;
}

Add the JavaScript code to handle the console input, output, and localStorage:

const output = document.getElementById('output');
const inputForm = document.getElementById('input-form');
const input = document.getElementById('input');

// Load previous session data from localStorage
const sessionData = localStorage.getItem('sessionData');
if (sessionData) {
    output.innerHTML = sessionData;
}

inputForm.addEventListener('submit', (e) => {
    e.preventDefault();
    
    const inputValue = input.value;
    const command = document.createElement('div');
    command.textContent = `> ${inputValue}`;
    output.appendChild(command);

    try {
        const result = eval(inputValue);
        const resultElem = document.createElement('div');
        resultElem.textContent = result;
        output.appendChild(resultElem);
    } catch (error) {
        const errorElem = document.createElement('div');
        errorElem.style.color = 'red';
        errorElem.textContent = error;
        output.appendChild(errorElem);
    }

    // Save the session data to localStorage
    localStorage.setItem('sessionData', output.innerHTML);
    
    input.value = '';
});

This basic implementation provides a simple on-page JavaScript console that stores the session history in localStorage. You can further customize the appearance, features, and behavior to suit your specific needs.

justinledwards/ChatGPT-On-Page_JavaScript_Console.md

On-Page JavaScript Console.

ChatGPT: