javascript/index-video3.html at main · Einzigartige/javascript · 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" />
    <title>JavaScript Loops & Events – Full Demo</title>
    <style>
        :root {
            --primary: #0078ff;
            --muted: #666;
            --card-bg: #fff;
            --page-bg: #f4f4f4;
        }

        body {
            font-family: Arial, Helvetica, sans-serif;
            background: var(--page-bg);
            margin: 0;
            padding: 20px;
            color: #222;
            line-height: 1.5;
        }

        h1 {
            text-align: center;
            margin: 8px 0 20px;
        }

        .container {
            max-width: 980px;
            margin: 0 auto;
        }

        .card {
            background: var(--card-bg);
            border-radius: 10px;
            padding: 18px;
            margin: 18px 0;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
        }

        /* Social */
        .social-section {
            text-align: center;
        }

        .social-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .social-icons {
            display: flex;
            justify-content: center;
            gap: 18px;
            flex-wrap: wrap;
            align-items: center;
        }

        .social-icons a {
            text-decoration: none;
            color: #111;
            display: flex;
            flex-direction: column;
            align-items: center;
            font-size: 13px;
            transition: transform .15s ease, color .15s ease;
        }

        .social-icons a:hover {
            transform: translateY(-4px);
            color: var(--primary);
        }

        .social-icons img {
            width: 40px;
            height: 40px;
            margin-bottom: 6px;
        }

        /* small UI */
        .controls {
            display: flex;
            gap: 10px;
            align-items: center;
            flex-wrap: wrap;
        }

        input[type="number"],
        input[type="text"],
        select {
            padding: 8px 10px;
            border-radius: 6px;
            border: 1px solid #dcdcdc;
            width: 150px;
        }

        button {
            padding: 8px 14px;
            border-radius: 8px;
            border: none;
            background: var(--primary);
            color: #fff;
            cursor: pointer;
        }

        button.secondary {
            background: #5a5a5a;
        }

        pre.output {
            background: #fafafa;
            border: 1px solid #e6e6e6;
            padding: 12px;
            border-radius: 6px;
            white-space: pre-wrap;
            max-height: 240px;
            overflow: auto;
            font-family: monospace;
            font-size: 13px;
        }

        /* Events demo box */
        .box {
            width: 240px;
            height: 84px;
            border-radius: 8px;
            background: #eee;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 8px;
            user-select: none;
        }

        .small {
            font-size: 13px;
            color: var(--muted);
        }

        .muted {
            color: var(--muted);
        }

        /* layout helpers */
        .row {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            flex-wrap: wrap;
        }

        .col {
            flex: 1;
            min-width: 260px;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>JavaScript Loops & Events – Full Demo</h1>

        <!-- ⭐ SOCIAL MEDIA LINKS -->
        <div class="card social-section">
            <div class="social-title">Follow Us on Social Media</div>

            <div class="social-icons">

                <a href="http://einzigartige.in/" target="_blank" rel="noopener">
                    <img src="https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/internetarchive.svg" alt="Website">
                    Website
                </a>

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                    <img src="https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/youtube.svg" alt="YouTube">
                    YouTube
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                    <img src="https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/linkedin.svg" alt="LinkedIn">
                    LinkedIn
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                    <img src="https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/medium.svg" alt="Medium">
                    Medium
                </a>
            </div>
        </div>

        <!-- ROW: DO-WHILE + Loop Demos -->
        <div class="row">
            <div class="col card">
                <h2>Do / While Loop - Step-by-Step</h2>
                <p class="small">A <code>do...while</code> loop executes the body at least once, then evaluates the
                    condition. Use controls to step or auto-run.</p>

                <div class="controls" style="margin:8px 0 6px;">
                    <label class="small muted">Start:
                        <input id="dwStart" type="number" value="1">
                    </label>

                    <label class="small muted">Limit (<code>i &lt;= limit</code>):
                        <input id="dwLimit" type="number" value="5">
                    </label>

                    <label class="small muted">Increment:
                        <input id="dwInc" type="number" value="1">
                    </label>

                    <button id="dwStepBtn">Step</button>
                    <button id="dwRunBtn">Run</button>
                    <button id="dwResetBtn" class="secondary">Reset</button>
                    <button id="dwClearBtn" class="secondary">Clear</button>
                </div>

                <pre id="dwOutput" class="output" aria-live="polite"></pre>
                <p class="small muted">Output shows: variable before body, body action, variable after body, condition
                    result.</p>
            </div>

            <div class="col card">
                <h2>Loop Quick Demos</h2>
                <div style="display:flex; gap:10px; flex-wrap:wrap; margin-bottom:10px;">
                    <button onclick="runDoWhileDemo()">Run Simple do...while</button>
                    <button onclick="runWhile()">Run while</button>
                    <button onclick="runFor()">Run for</button>
                    <button onclick="runForIn()">Run for...in</button>
                    <button onclick="runForOf()">Run for...of</button>
                </div>

                <pre id="loopsOutput" class="output"></pre>
                <p class="small muted">The "Quick Demos" run small examples and append to the output area.</p>
            </div>
        </div>

        <footer style="text-align:center; color:var(--muted); font-size:13px; margin:18px 0 0;">
            Built for demo • Supports loops & events • Copy / reuse freely
            <br><br>
            © Copyright 2019 - <span id="year"></span>
            <a href="https://einzigartige.in/" target="_blank" style="color:inherit; text-decoration:none;">
                Einzigartige - Web & App Development
            </a>
            | All Rights Reserved.
        </footer>

    </div>


    <script>
        document.getElementById("year").textContent = new Date().getFullYear();
    </script>
    <script>
        /* =========================
           DO / WHILE — Step-by-step logic
           (interactive UI)
           ========================= */
        (function () {
            const startInput = document.getElementById('dwStart');
            const limitInput = document.getElementById('dwLimit');
            const incInput = document.getElementById('dwInc');
            const out = document.getElementById('dwOutput');
            const stepBtn = document.getElementById('dwStepBtn');
            const runBtn = document.getElementById('dwRunBtn');
            const resetBtn = document.getElementById('dwResetBtn');
            const clearBtn = document.getElementById('dwClearBtn');

            let state = {
                i: 1,
                limit: 5,
                inc: 1,
                stepCount: 0,
                running: false,
                autoInterval: null,
                initialized: false
            };

            function initState() {
                const s = parseInt(startInput.value, 10);
                const l = parseInt(limitInput.value, 10);
                const inc = parseInt(incInput.value, 10);

                state.i = Number.isFinite(s) ? s : 1;
                state.limit = Number.isFinite(l) ? l : 5;
                state.inc = (Number.isFinite(inc) && inc !== 0) ? inc : 1;
                state.stepCount = 0;
                state.running = false;
                state.initialized = true;
            }

            function appendLine(line) {
                out.textContent += line + '\n';
                out.scrollTop = out.scrollHeight;
            }

            function resetOutput() {
                out.textContent = '';
                appendLine('do {');
                appendLine('  // body executes at least once');
                appendLine('} while (i <= limit);');
                appendLine('-----------------------------');
                appendLine(`Initial values -> i: ${state.i}, limit: ${state.limit}, inc: ${state.inc}`);
                appendLine('-----------------------------');
            }

            function stepOnce() {
                if (!state.initialized) initState();

                const before = state.i;

                appendLine(`Step ${state.stepCount + 1}:`);
                appendLine(`  before body -> i = ${before}`);

                // Body action (demo)
                appendLine(`  body: console.log("Processing i =", ${before})`);

                // Apply body effect: increment
                state.i = state.i + state.inc;
                appendLine(`  after body -> i = ${state.i}`);

                // Evaluate condition after body (JS semantics)
                const condEval = (state.i <= state.limit);
                appendLine(`  condition -> (i <= limit) => (${state.i} <= ${state.limit}) is ${condEval}`);
                appendLine(`  loop ${condEval ? 'will continue' : 'will stop'}`);
                appendLine('-----------------------------');

                state.stepCount += 1;
                return condEval;
            }

            stepBtn.addEventListener('click', function () {
                if (state.running) return;
                if (!state.initialized) initState();
                const shouldContinue = stepOnce();
                if (!shouldContinue) appendLine('Loop finished (manual).');
            });

            runBtn.addEventListener('click', function () {
                if (state.running) {
                    // stop
                    state.running = false;
                    if (state.autoInterval) {
                        clearInterval(state.autoInterval);
                        state.autoInterval = null;
                        appendLine('Auto-run stopped by user.');
                    }
                    runBtn.textContent = 'Run';
                    return;
                }

                if (!state.initialized) initState();
                resetOutput();
                state.running = true;
                runBtn.textContent = 'Stop';

                function runStep() {
                    const cont = stepOnce();
                    if (!cont || !state.running) {
                        state.running = false;
                        if (state.autoInterval) {
                            clearInterval(state.autoInterval);
                            state.autoInterval = null;
                        }
                        appendLine('Auto-run finished.');
                        runBtn.textContent = 'Run';
                    }
                }

                // run first step immediately
                runStep();

                if (state.running) {
                    state.autoInterval = setInterval(runStep, 600);
                }
            });

            resetBtn.addEventListener('click', function () {
                if (state.autoInterval) {
                    clearInterval(state.autoInterval);
                    state.autoInterval = null;
                }
                state.running = false;
                state.initialized = false;
                initState();
                resetOutput();
                appendLine('State reset. Click Step or Run to start again.');
                runBtn.textContent = 'Run';
            });

            clearBtn.addEventListener('click', function () {
                out.textContent = '';
            });

            // initialize display
            initState();
            resetOutput();
        })();

        /* =========================
           Quick loop demos appended to loopsOutput
           ========================= */

        function appendToLoopsOutput(text, clear = false) {
            const out = document.getElementById('loopsOutput');
            if (clear) out.textContent = '';
            out.textContent += text + '\n';
            out.scrollTop = out.scrollHeight;
        }

        function runDoWhileDemo() {
            let i = 1;
            let result = 'Simple do...while demo:\n';
            do {
                result += `  do iteration i = ${i}\n`;
                i++;
            } while (i <= 3);
            appendToLoopsOutput(result);
        }

        function runWhile() {
            let i = 1;
            let result = 'While loop demo:\n';
            while (i <= 5) {
                result += `  while i = ${i}\n`;
                i++;
            }
            appendToLoopsOutput(result);
        }

        function runFor() {
            let result = 'For loop demo:\n';
            for (let i = 1; i <= 5; i++) {
                result += `  for i = ${i}\n`;
            }
            appendToLoopsOutput(result);
        }

        function runForIn() {
            const person = { name: "Harry", age: 25, city: "Ahmedabad" };
            let result = 'For...in (object) demo:\n';
            for (let key in person) {
                result += `  ${key}: ${person[key]}\n`;
            }
            appendToLoopsOutput(result);
        }

        function runForOf() {
            const animals = ["Cat", "Dog", "Lion", "Tiger"];
            let result = 'For...of (array) demo:\n';
            for (let animal of animals) {
                result += `  ${animal}\n`;
            }
            appendToLoopsOutput(result);
        }
    </script>
</body>

</html>