Developer-Toolbox/tool-60-JavaScript-Error-Simulator.html at main · Aliriyaj007/Developer-Toolbox · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Tool 60 - JavaScript Error Simulator - Developer Toolbox</title>
    <link rel="stylesheet" href="assets/core.css">
    <style>
        .split-view {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
            margin-bottom: 2rem;
            margin-top: 1rem;
        }
        @media (min-width: 900px) {
            .split-view { grid-template-columns: 350px 1fr; }
        }

        .controls-panel {
            background: rgba(0,0,0,0.4);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 1.5rem;
        }

        .control-group {
            margin-bottom: 1.2rem;
        }

        .control-group label {
            display: block;
            color: var(--text-secondary);
            font-weight: bold;
            margin-bottom: 0.5rem;
        }

        select, input[type="text"] {
            width: 100%;
            background: var(--bg-main);
            color: var(--text-primary);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 0.8rem;
        }

        .btn-trigger {
            background: #ff5555;
            color: white;
            border: none;
            padding: 1rem;
            width: 100%;
            font-size: 1.2rem;
            font-weight: bold;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: all 0.2s;
            box-shadow: 0 4px 15px rgba(255,85,85,0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .btn-trigger:hover {
            background: #ff3333;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255,85,85,0.5);
        }

        .btn-trigger:active {
            transform: translateY(1px);
        }

        .output-box {
            background: var(--bg-main);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.5);
        }

        .output-header {
            background: rgba(255,255,255,0.05);
            padding: 1rem 1.5rem;
            border-bottom: 1px solid var(--border-color);
            font-weight: bold;
            display: flex;
            justify-content: space-between;
        }

        .console-output {
            padding: 1.5rem;
            font-family: var(--font-mono);
            font-size: 0.95rem;
            line-height: 1.5;
            min-height: 250px;
            overflow-y: auto;
        }

        .error-log {
            color: #ffaa00; /* Start orange like console Warning but will turn red if uncaught */
            margin-bottom: 1rem;
            border-left: 3px solid #ff5555;
            padding-left: 1rem;
            background: rgba(255,85,85,0.1);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            white-space: pre-wrap;
            word-break: break-all;
        }

        .log-time { color: var(--text-secondary); margin-right: 0.5rem; }

        .analysis-box {
            margin-top: 1rem;
            padding: 1rem;
            background: rgba(86,182,194,0.1);
            border: 1px solid var(--primary-color);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
        }

    </style>
</head>
<body class="theme-dark">
    <!-- Background Canvas -->
    <div class="tool-canvas-container" id="canvas-container"></div>

    <main class="main-content">
        <div class="container" style="max-width: 1100px;">
            <div class="tool-header">
                <div>
                    <a href="index.html" class="back-link">← Back to Toolbox</a>
                    <h1>60. JavaScript Error Simulator</h1>
                </div>
                <div>
                    <select id="theme-select" aria-label="Select Theme">
                        <option value="dark">Dark Theme</option>
                        <option value="light">Light Theme</option>
                        <option value="solarized">Solarized</option>
                        <option value="neon">Neon Glow</option>
                        <option value="highcontrast">High Contrast</option>
                    </select>
                </div>
            </div>

            <div class="glass-panel">
                <div class="split-view">

                    <!-- Controls -->
                    <div class="controls-panel">
                        <div class="control-group">
                            <label>Error Type</label>
                            <select id="err-type">
                                <option value="TypeError">TypeError</option>
                                <option value="ReferenceError">ReferenceError</option>
                                <option value="SyntaxError">SyntaxError (Simulated)</option>
                                <option value="RangeError">RangeError</option>
                                <option value="URIError">URIError</option>
                                <option value="CustomError">Custom Error</option>
                            </select>
                        </div>

                        <div class="control-group">
                            <label>Custom Message</label>
                            <input type="text" id="err-msg" value="Cannot read property 'foo' of undefined">
                        </div>

                        <div class="control-group">
                            <label>Trigger Environment</label>
                            <select id="err-env">
                                <option value="sync">Synchronous (Top Level)</option>
                                <option value="promise">Inside Promise (Unhandled Rejection)</option>
                                <option value="timeout">Inside setTimeout (Async)</option>
                                <option value="trycatch">Inside try...catch</option>
                            </select>
                        </div>

                        <button class="btn-trigger" id="btn-trigger">💣 Detonate Error</button>

                        <div style="text-align:center; margin-top: 1rem;">
                            <button class="btn btn-sm" id="btn-clear">🧹 Clear Console</button>
                        </div>
                    </div>

                    <!-- Output Area -->
                    <div>
                        <div class="output-box">
                            <div class="output-header">
                                <span>💻 Simulated Console</span>
                                <span style="color:var(--text-secondary); font-size:0.8rem;">Filter: All Levels</span>
                            </div>
                            <div class="console-output" id="console-out">
                                <div style="color:var(--text-secondary); font-style:italic;">Awaiting error trigger...</div>
                            </div>
                        </div>

                        <div class="analysis-box" id="analysis-box" style="display:none;">
                            <h4 style="margin-top:0; color:var(--primary-color);">Behavior Analysis</h4>
                            <p id="analysis-text" style="font-size:0.9rem; line-height:1.5; margin:0;"></p>
                        </div>
                    </div>

                </div>
            </div>
        </div>
    </main>

    <footer class="global-footer">
        <div class="container">
            Made with ❤️ by <a href="https://github.com/Aliriyaj007" target="_blank">Aliriyaj007</a>
        </div>
    </footer>

    <script src="assets/core.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r134/three.min.js"></script>

    <script>
        const errTypeSelect = document.getElementById('err-type');
        const errMsgInput = document.getElementById('err-msg');
        const errEnvSelect = document.getElementById('err-env');
        const btnTrigger = document.getElementById('btn-trigger');
        const consoleOut = document.getElementById('console-out');
        const btnClear = document.getElementById('btn-clear');
        const analysisBox = document.getElementById('analysis-box');
        const analysisText = document.getElementById('analysis-text');

        // Presets
        const typePresets = {
            'TypeError': "Cannot read properties of undefined (reading 'foo')",
            'ReferenceError': "foo is not defined",
            'SyntaxError': "Unexpected token 'var'",
            'RangeError': "Maximum call stack size exceeded",
            'URIError': "URI malformed",
            'CustomError': "Application state went BOOM"
        };

        errTypeSelect.addEventListener('change', () => {
             errMsgInput.value = typePresets[errTypeSelect.value];
        });

        function logToConsole(message, isError) {
            // Remove placeholder if present
            if(consoleOut.innerHTML.includes('Awaiting error trigger')) {
                consoleOut.innerHTML = '';
            }

            const time = new Date().toLocaleTimeString();
            const div = document.createElement('div');

            if(isError) {
                div.className = 'error-log';
                div.innerHTML = `<span class="log-time">[${time}]</span> <strong style="color:#ff5555">❌ Uncaught ${message}</strong>`;
            } else {
                div.style.marginBottom = '0.5rem';
                div.innerHTML = `<span class="log-time">[${time}]</span> <span style="color:#7ee787">ℹ️ ${message}</span>`;
            }

            consoleOut.appendChild(div);
            consoleOut.scrollTop = consoleOut.scrollHeight;
        }

        // We capture unhandled promise rejections and global errors for realistic simulation
        window.addEventListener('error', (event) => {
            // Only capture our simulated errors based on a flag
            if(window._simulatingError) {
                event.preventDefault(); // Stop from hitting real browser console if possible
                logToConsole(event.error ? event.error.stack : event.message, true);
                window._simulatingError = false;
            }
        });

        window.addEventListener('unhandledrejection', (event) => {
            if(window._simulatingError) {
                event.preventDefault();
                logToConsole(`(in promise) ${event.reason ? event.reason.stack : event.reason}`, true);
                window._simulatingError = false;
            }
        });

        function createErrorObj(type, msg) {
            switch(type) {
                case 'TypeError': return new TypeError(msg);
                case 'ReferenceError': return new ReferenceError(msg);
                case 'SyntaxError': return new SyntaxError(msg);
                case 'RangeError': return new RangeError(msg);
                case 'URIError': return new URIError(msg);
                default:
                    const e = new Error(msg);
                    e.name = type; // Custom Error name
                    return e;
            }
        }

        btnTrigger.addEventListener('click', () => {
            const type = errTypeSelect.value;
            const msg = errMsgInput.value;
            const env = errEnvSelect.value;
            const err = createErrorObj(type, msg);

            window._simulatingError = true;

            // Trigger 3D explosion
            if(window.detonateBomb) window.detonateBomb();

            setTimeout(() => {
                if(env === 'sync') {
                    analysisBox.style.display = 'block';
                    analysisText.innerHTML = "<strong>Synchronous Top-Level:</strong> Halts execution of the current script block immediately. Bubbles up to the global <code>window.onerror</code> handler.";

                    // We throw directly but catch it ourselves to display properly,
                    // or let global handler catch it. Let's let global catch it.
                    setTimeout(() => { throw err; }, 0);

                } else if(env === 'promise') {
                    analysisBox.style.display = 'block';
                    analysisText.innerHTML = "<strong>Unhandled Promise Rejection:</strong> Does NOT halt synchronous code execution. Bubbles to <code>window.onunhandledrejection</code>. In modern Node.js, this crashes the process; in browsers, it logs heavily.";

                    new Promise((resolve, reject) => {
                        reject(err);
                    });

                } else if(env === 'timeout') {
                    analysisBox.style.display = 'block';
                    analysisText.innerHTML = "<strong>Inside setTimeout:</strong> Error occurs in a completely new call stack. Cannot be caught by an enclosing try...catch block outside the timeout! Bubbles to global handler.";

                    setTimeout(() => {
                        throw err;
                    }, 100);

                } else if(env === 'trycatch') {
                    analysisBox.style.display = 'block';
                    analysisText.innerHTML = "<strong>Inside try...catch:</strong> Gracefully intercepted. The application does not crash, and the global error handler is never notified. Execution continues after the catch block.";

                    try {
                        throw err;
                    } catch(e) {
                        window._simulatingError = false;
                        logToConsole(`Caught safely: ${e.name} - ${e.message}`, false);
                        logToConsole(e.stack, false);
                    }
                }
            }, 10);
        });

        btnClear.addEventListener('click', () => {
            consoleOut.innerHTML = '<div style="color:var(--text-secondary); font-style:italic;">Awaiting error trigger...</div>';
            analysisBox.style.display = 'none';
            if(window.resetBomb) window.resetBomb();
        });


        // 3D Visualization: A Bomb that explodes
        let scene, camera, renderer, bombGroup;
        let particles = [];
        let isExploded = false;

        function init3D() {
            const container = document.getElementById('canvas-container');
            if(!container || !window.THREE) return;

            scene = new THREE.Scene();
            camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 100);
            camera.position.set(0, 0, 15);
            camera.lookAt(0, 0, 0);

            renderer = new THREE.WebGLRenderer({ alpha: true, antialias: true });
            renderer.setSize(window.innerWidth, window.innerHeight);
            container.appendChild(renderer.domElement);

            const ambientLight = new THREE.AmbientLight(0xffffff, 0.5);
            scene.add(ambientLight);

            const dirLight = new THREE.DirectionalLight(0xff5555, 1);
            dirLight.position.set(5, 5, 5);
            scene.add(dirLight);

            bombGroup = new THREE.Group();
            scene.add(bombGroup);

            // Shift right to balance UI layout
            scene.position.x = 2;
            scene.position.y = 2;

            createBombBody();

            window.addEventListener('resize', () => {
                camera.aspect = window.innerWidth / window.innerHeight;
                camera.updateProjectionMatrix();
                renderer.setSize(window.innerWidth, window.innerHeight);
            });

            animate();
        }

        function createBombBody() {
            // Main sphere
            const geo = new THREE.SphereGeometry(1.5, 32, 32);
            const mat = new THREE.MeshPhongMaterial({ color: 0x222222, shininess: 80 });
            const sphere = new THREE.Mesh(geo, mat);
            bombGroup.add(sphere);

            // Fuse cap
            const capGeo = new THREE.CylinderGeometry(0.4, 0.4, 0.5, 16);
            const capMat = new THREE.MeshPhongMaterial({ color: 0x555555 });
            const cap = new THREE.Mesh(capGeo, capMat);
            cap.position.y = 1.5;
            bombGroup.add(cap);

            // Fuse wire
            const curve = new THREE.CatmullRomCurve3([
                new THREE.Vector3(0, 1.7, 0),
                new THREE.Vector3(0.5, 2.2, 0),
                new THREE.Vector3(1.2, 2.0, 0),
                new THREE.Vector3(1.5, 2.5, 0)
            ]);
            const tubeGeo = new THREE.TubeGeometry(curve, 20, 0.05, 8, false);
            const tubeMat = new THREE.MeshBasicMaterial({ color: 0xaaaaaa });
            const fuse = new THREE.Mesh(tubeGeo, tubeMat);
            bombGroup.add(fuse);

            // Spark (initially hidden)
            const sparkGeo = new THREE.SphereGeometry(0.15, 8, 8);
            const sparkMat = new THREE.MeshBasicMaterial({ color: 0xffaa00 });
            const spark = new THREE.Mesh(sparkGeo, sparkMat);
            spark.position.copy(curve.points[curve.points.length-1]);
            spark.name = "spark";
            bombGroup.add(spark);
        }

        window.detonateBomb = () => {
            if(!bombGroup || isExploded) return;
            isExploded = true;

            // Flash screen
            document.body.style.background = '#ff5555';
            setTimeout(() => { document.body.style.background = ''; }, 100);

            // Hide original bomb
            bombGroup.visible = false;

            // Create explosion particles out of nothing
            const particleCount = 200;
            const geo = new THREE.BoxGeometry(0.2, 0.2, 0.2);

            for(let i=0; i<particleCount; i++) {
                // Random hot colors
                const colors = [0xff5555, 0xffaa00, 0xffffff, 0x333333];
                const color = colors[Math.floor(Math.random() * colors.length)];
                const mat = new THREE.MeshPhongMaterial({ color: color });
                const mesh = new THREE.Mesh(geo, mat);

                // Start exactly where bomb was
                mesh.position.set(0,0,0);

                // Explode outward radially
                const theta = Math.random() * Math.PI * 2;
                const phi = Math.acos((Math.random() * 2) - 1);

                const speed = Math.random() * 0.5 + 0.1;
                mesh.userData = {
                    vx: Math.sin(phi) * Math.cos(theta) * speed,
                    vy: Math.sin(phi) * Math.sin(theta) * speed,
                    vz: Math.cos(phi) * speed,
                    rotX: Math.random() * 0.2,
                    rotY: Math.random() * 0.2,
                    life: 1.0
                };

                scene.add(mesh); // add to scene directly to ignore bombGroup coords
                particles.push({ mesh, group: null }); // group null means it's in scene attached to origin X:2 Y:2 approx

                // Adjust position to match bombGroup visual origin
                mesh.position.x = bombGroup.position.x + 2; // scene offset
                mesh.position.y = bombGroup.position.y + 2;
            }
        };

        window.resetBomb = () => {
             if(!bombGroup) return;
             isExploded = false;
             bombGroup.visible = true;

             // Clean particles
             particles.forEach(p => scene.remove(p.mesh));
             particles = [];
        };

        function animate() {
            requestAnimationFrame(animate);

            if(bombGroup && !isExploded) {
                // slow float and rotate
                bombGroup.rotation.y += 0.01;
                bombGroup.position.y = Math.sin(Date.now() * 0.002) * 0.1;

                // Spark flicker
                const spark = bombGroup.getObjectByName("spark");
                if(spark) {
                    spark.scale.setScalar(1 + Math.random() * 0.5);
                    spark.material.color.setHex(Math.random() > 0.5 ? 0xffaa00 : 0xff2200);
                }
            }

            if(isExploded) {
                // Animate particles
                particles.forEach((p, idx) => {
                    const m = p.mesh;
                    m.position.x += m.userData.vx;
                    m.position.y += m.userData.vy;
                    m.position.z += m.userData.vz;

                    m.rotation.x += m.userData.rotX;
                    m.rotation.y += m.userData.rotY;

                    // gravity
                    m.userData.vy -= 0.01;

                    // shrink
                    m.scale.setScalar(m.userData.life);
                    m.userData.life -= 0.02;

                    if(m.userData.life <= 0) {
                        scene.remove(m);
                        particles.splice(idx, 1);
                    }
                });
            }

            renderer.render(scene, camera);
        }

        document.addEventListener('DOMContentLoaded', init3D);

    </script>
</body>
</html>