inter-window-messaging/index.html at main · facetdigital/inter-window-messaging · 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>Window A</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 20px;
        }
        h1 {
            margin-bottom: 20px;
        }
        .container {
            width: 100%;
            max-width: 500px;
            margin-bottom: 20px;
        }
        select {
            width: 100%;
            font-size: 16px;
            padding: 8px;
        }
        select[size] {
            height: 250px;
        }
        .button-container {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 20px;
            width: 100%;
            max-width: 500px;
        }
        button {
            padding: 8px 16px;
            font-size: 16px;
            cursor: pointer;
        }
        .radio-container {
            display: flex;
            flex-direction: column;
            gap: 8px;
            width: 100%;
            max-width: 500px;
        }
        .radio-option {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        ul {
            list-style-type: none;
            padding: 0;
            width: 100%;
            max-width: 500px;
        }
        li {
            padding: 8px;
            cursor: pointer;
            border-bottom: 1px solid #eee;
        }
        li:hover {
            background-color: #f5f5f5;
        }
        li.selected {
            font-weight: bold;
        }
        #debug-output {
            width: 100%;
            max-width: 500px;
            height: 150px;
            overflow-y: auto;
            border: 1px solid #ccc;
            padding: 10px;
            font-family: monospace;
            margin-top: 20px;
            background-color: #f5f5f5;
            font-size: 12px;
        }
        .window-type {
            display: none;
        }
    </style>
</head>
<body>
    <h1 id="window-title">Window A</h1>

    <!-- Window Open Buttons - only shown in Window A -->
    <div class="button-container" id="window-buttons">
        <button id="open-window-b">Open Window B</button>
        <button id="open-window-c">Open Window C</button>
        <button id="open-window-d">Open Window D</button>
    </div>

    <!-- Window A Content: Multi-select list box -->
    <div class="window-type" id="window-a-content">
        <div class="container">
            <select id="list-select" size="10">
                <option value="One">One</option>
                <option value="Two">Two</option>
                <option value="Three">Three</option>
                <option value="Four">Four</option>
                <option value="Five">Five</option>
                <option value="Six">Six</option>
                <option value="Seven">Seven</option>
                <option value="Eight">Eight</option>
                <option value="Nine">Nine</option>
                <option value="Ten">Ten</option>
            </select>
        </div>
    </div>

    <!-- Window B Content: Dropdown select -->
    <div class="window-type" id="window-b-content">
        <div class="container">
            <select id="dropdown-select">
                <option value="" disabled selected>Select an option</option>
                <option value="One">One</option>
                <option value="Two">Two</option>
                <option value="Three">Three</option>
                <option value="Four">Four</option>
                <option value="Five">Five</option>
                <option value="Six">Six</option>
                <option value="Seven">Seven</option>
                <option value="Eight">Eight</option>
                <option value="Nine">Nine</option>
                <option value="Ten">Ten</option>
            </select>
        </div>
    </div>

    <!-- Window C Content: Radio buttons -->
    <div class="window-type" id="window-c-content">
        <div class="radio-container" id="radio-container">
            <div class="radio-option">
                <input type="radio" id="radio-One" name="option" value="One">
                <label for="radio-One">One</label>
            </div>
            <div class="radio-option">
                <input type="radio" id="radio-Two" name="option" value="Two">
                <label for="radio-Two">Two</label>
            </div>
            <div class="radio-option">
                <input type="radio" id="radio-Three" name="option" value="Three">
                <label for="radio-Three">Three</label>
            </div>
            <div class="radio-option">
                <input type="radio" id="radio-Four" name="option" value="Four">
                <label for="radio-Four">Four</label>
            </div>
            <div class="radio-option">
                <input type="radio" id="radio-Five" name="option" value="Five">
                <label for="radio-Five">Five</label>
            </div>
            <div class="radio-option">
                <input type="radio" id="radio-Six" name="option" value="Six">
                <label for="radio-Six">Six</label>
            </div>
            <div class="radio-option">
                <input type="radio" id="radio-Seven" name="option" value="Seven">
                <label for="radio-Seven">Seven</label>
            </div>
            <div class="radio-option">
                <input type="radio" id="radio-Eight" name="option" value="Eight">
                <label for="radio-Eight">Eight</label>
            </div>
            <div class="radio-option">
                <input type="radio" id="radio-Nine" name="option" value="Nine">
                <label for="radio-Nine">Nine</label>
            </div>
            <div class="radio-option">
                <input type="radio" id="radio-Ten" name="option" value="Ten">
                <label for="radio-Ten">Ten</label>
            </div>
        </div>
    </div>

    <!-- Window D Content: List items -->
    <div class="window-type" id="window-d-content">
        <ul id="list-container">
            <li data-value="One">One</li>
            <li data-value="Two">Two</li>
            <li data-value="Three">Three</li>
            <li data-value="Four">Four</li>
            <li data-value="Five">Five</li>
            <li data-value="Six">Six</li>
            <li data-value="Seven">Seven</li>
            <li data-value="Eight">Eight</li>
            <li data-value="Nine">Nine</li>
            <li data-value="Ten">Ten</li>
        </ul>
    </div>

    <div id="debug-output"></div>

    <script>
        // Configuration
        const ALLOWED_ORIGIN = window.location.origin;
        const WINDOW_TYPES = ['A', 'B', 'C', 'D'];

        // State variables
        let windowRefs = {
            B: null,
            C: null,
            D: null
        };
        let isProcessingRemoteChange = false;

        // Determine which window we are
        let currentWindowType = 'A'; // Default

        if (window.name === 'WindowB') currentWindowType = 'B';
        if (window.name === 'WindowC') currentWindowType = 'C';
        if (window.name === 'WindowD') currentWindowType = 'D';

        // Debug function
        function debugLog(message) {
            console.log(message);
            const debugOutput = document.getElementById('debug-output');
            const timestamp = new Date().toLocaleTimeString();
            debugOutput.innerHTML += `[${timestamp}] ${message}<br>`;
            debugOutput.scrollTop = debugOutput.scrollHeight;
        }

        // Set the window title and show appropriate content
        document.getElementById("window-title").textContent = "Window " + currentWindowType;
        document.title = "Window " + currentWindowType;

        // Hide window buttons for non-A windows
        if (currentWindowType !== 'A') {
            document.getElementById("window-buttons").style.display = "none";
        }

        // Show correct content for this window type
        document.getElementById(`window-${currentWindowType.toLowerCase()}-content`).style.display = "block";

        // Get references to UI elements
        const listSelect = document.getElementById("list-select");
        const dropdownSelect = document.getElementById("dropdown-select");
        const radioButtons = document.querySelectorAll('input[type="radio"][name="option"]');
        const listItems = document.querySelectorAll('#list-container li');

        // Open window buttons
        if (currentWindowType === 'A') {
            document.getElementById("open-window-b").addEventListener("click", () => {
                windowRefs.B = window.open(window.location.href, "WindowB", "width=500,height=600");
                if (windowRefs.B) {
                    debugLog("Window B opened");
                    // Wait for window to initialize then send current selection
                    setTimeout(() => sendCurrentSelection(), 1000);
                } else {
                    debugLog("Failed to open Window B");
                }
            });

            document.getElementById("open-window-c").addEventListener("click", () => {
                windowRefs.C = window.open(window.location.href, "WindowC", "width=500,height=600");
                if (windowRefs.C) {
                    debugLog("Window C opened");
                    // Wait for window to initialize then send current selection
                    setTimeout(() => sendCurrentSelection(), 1000);
                } else {
                    debugLog("Failed to open Window C");
                }
            });

            document.getElementById("open-window-d").addEventListener("click", () => {
                windowRefs.D = window.open(window.location.href, "WindowD", "width=500,height=600");
                if (windowRefs.D) {
                    debugLog("Window D opened");
                    // Wait for window to initialize then send current selection
                    setTimeout(() => sendCurrentSelection(), 1000);
                } else {
                    debugLog("Failed to open Window D");
                }
            });
        }

        // Event listeners for each UI component

        // Window A: List box
        if (currentWindowType === 'A') {
            listSelect.addEventListener("change", () => {
                if (isProcessingRemoteChange) return;

                const selectedIndex = listSelect.selectedIndex;
                if (selectedIndex !== -1) {
                    const selectedValue = listSelect.options[selectedIndex].value;
                    debugLog(`Selected option: ${selectedValue}`);
                    broadcastSelection(selectedValue);
                }
            });
        }

        // Window B: Dropdown
        if (currentWindowType === 'B') {
            dropdownSelect.addEventListener("change", () => {
                if (isProcessingRemoteChange) return;

                const selectedValue = dropdownSelect.value;
                if (selectedValue) {
                    debugLog(`Selected option: ${selectedValue}`);
                    broadcastSelection(selectedValue);
                }
            });
        }

        // Window C: Radio buttons
        if (currentWindowType === 'C') {
            radioButtons.forEach(radio => {
                radio.addEventListener("change", () => {
                    if (isProcessingRemoteChange) return;

                    if (radio.checked) {
                        const selectedValue = radio.value;
                        debugLog(`Selected option: ${selectedValue}`);
                        broadcastSelection(selectedValue);
                    }
                });
            });
        }

        // Window D: List items
        if (currentWindowType === 'D') {
            listItems.forEach(item => {
                item.addEventListener("click", () => {
                    if (isProcessingRemoteChange) return;

                    // Remove selected class from all items
                    listItems.forEach(li => li.classList.remove('selected'));

                    // Add selected class to clicked item
                    item.classList.add('selected');

                    const selectedValue = item.getAttribute('data-value');
                    debugLog(`Selected option: ${selectedValue}`);
                    broadcastSelection(selectedValue);
                });
            });
        }

        // Function to update the UI based on a selected value
        function updateUISelection(value) {
            isProcessingRemoteChange = true;

            try {
                // Window A: Update list box
                if (currentWindowType === 'A') {
                    for (let i = 0; i < listSelect.options.length; i++) {
                        if (listSelect.options[i].value === value) {
                            listSelect.selectedIndex = i;
                            break;
                        }
                    }
                }

                // Window B: Update dropdown
                if (currentWindowType === 'B') {
                    dropdownSelect.value = value;
                }

                // Window C: Update radio buttons
                if (currentWindowType === 'C') {
                    radioButtons.forEach(radio => {
                        radio.checked = (radio.value === value);
                    });
                }

                // Window D: Update list items
                if (currentWindowType === 'D') {
                    listItems.forEach(item => {
                        if (item.getAttribute('data-value') === value) {
                            item.classList.add('selected');
                        } else {
                            item.classList.remove('selected');
                        }
                    });
                }

                debugLog(`Updated UI selection to: ${value}`);
            } catch (error) {
                debugLog(`Error updating UI: ${error.message}`);
            }

            // Reset flag
            setTimeout(() => {
                isProcessingRemoteChange = false;
            }, 100);
        }

        // Function to broadcast the selection to all open windows
        function broadcastSelection(value) {
            const message = {
                type: "selection-update",
                value: value,
                source: currentWindowType
            };

            // Send to parent window if we're not Window A
            if (currentWindowType !== 'A' && window.opener) {
                try {
                    window.opener.postMessage(message, ALLOWED_ORIGIN);
                    debugLog(`Sent selection to Window A: ${value}`);
                } catch (error) {
                    debugLog(`Error sending to Window A: ${error.message}`);
                }
            }

            // If we're Window A, send to all child windows
            if (currentWindowType === 'A') {
                // Send to Window B
                if (windowRefs.B && !windowRefs.B.closed) {
                    try {
                        windowRefs.B.postMessage(message, ALLOWED_ORIGIN);
                        debugLog(`Sent selection to Window B: ${value}`);
                    } catch (error) {
                        debugLog(`Error sending to Window B: ${error.message}`);
                    }
                }

                // Send to Window C
                if (windowRefs.C && !windowRefs.C.closed) {
                    try {
                        windowRefs.C.postMessage(message, ALLOWED_ORIGIN);
                        debugLog(`Sent selection to Window C: ${value}`);
                    } catch (error) {
                        debugLog(`Error sending to Window C: ${error.message}`);
                    }
                }

                // Send to Window D
                if (windowRefs.D && !windowRefs.D.closed) {
                    try {
                        windowRefs.D.postMessage(message, ALLOWED_ORIGIN);
                        debugLog(`Sent selection to Window D: ${value}`);
                    } catch (error) {
                        debugLog(`Error sending to Window D: ${error.message}`);
                    }
                }
            }
        }

        // Function to send current selection to new windows
        function sendCurrentSelection() {
            let currentValue = null;

            // Get current selection from Window A
            if (currentWindowType === 'A') {
                if (listSelect.selectedIndex !== -1) {
                    currentValue = listSelect.options[listSelect.selectedIndex].value;
                }
            }

            // If we have a selection, broadcast it
            if (currentValue) {
                debugLog(`Sending current selection to new windows: ${currentValue}`);
                broadcastSelection(currentValue);
            }
        }

        // Message listener for all windows
        window.addEventListener("message", (event) => {
            // Validate origin
            if (event.origin !== ALLOWED_ORIGIN) {
                debugLog(`Received message from unauthorized origin: ${event.origin}`);
                return;
            }

            // Process message
            if (event.data && event.data.type === "selection-update") {
                const sourceWindow = event.data.source;
                const selectedValue = event.data.value;

                debugLog(`Received selection update from Window ${sourceWindow}: ${selectedValue}`);

                // Update our UI
                updateUISelection(selectedValue);

                // If we're Window A, forward to other windows (except source)
                if (currentWindowType === 'A' && sourceWindow !== 'A') {
                    // Send to Window B
                    if (sourceWindow !== 'B' && windowRefs.B && !windowRefs.B.closed) {
                        try {
                            windowRefs.B.postMessage(event.data, ALLOWED_ORIGIN);
                            debugLog(`Forwarded selection to Window B: ${selectedValue}`);
                        } catch (error) {
                            debugLog(`Error forwarding to Window B: ${error.message}`);
                        }
                    }

                    // Send to Window C
                    if (sourceWindow !== 'C' && windowRefs.C && !windowRefs.C.closed) {
                        try {
                            windowRefs.C.postMessage(event.data, ALLOWED_ORIGIN);
                            debugLog(`Forwarded selection to Window C: ${selectedValue}`);
                        } catch (error) {
                            debugLog(`Error forwarding to Window C: ${error.message}`);
                        }
                    }

                    // Send to Window D
                    if (sourceWindow !== 'D' && windowRefs.D && !windowRefs.D.closed) {
                        try {
                            windowRefs.D.postMessage(event.data, ALLOWED_ORIGIN);
                            debugLog(`Forwarded selection to Window D: ${selectedValue}`);
                        } catch (error) {
                            debugLog(`Error forwarding to Window D: ${error.message}`);
                        }
                    }
                }
            } else if (event.data && event.data.type === "ready") {
                // Handle ready messages from child windows
                const sourceWindow = event.data.source;
                debugLog(`Received ready notification from Window ${sourceWindow}`);

                // Send current selection if any
                sendCurrentSelection();
            }
        });

        // Send ready notification to Window A if we're a child window
        if (currentWindowType !== 'A' && window.opener) {
            setTimeout(() => {
                try {
                    window.opener.postMessage({
                        type: "ready",
                        source: currentWindowType
                    }, ALLOWED_ORIGIN);
                    debugLog(`Sent ready notification to Window A`);
                } catch (error) {
                    debugLog(`Error sending ready notification: ${error.message}`);
                }
            }, 500);
        }

        // Window close handler
        window.addEventListener("beforeunload", () => {
            // If we're Window A, clear references to closed windows
            if (currentWindowType === 'A') {
                if (windowRefs.B && windowRefs.B.closed) windowRefs.B = null;
                if (windowRefs.C && windowRefs.C.closed) windowRefs.C = null;
                if (windowRefs.D && windowRefs.D.closed) windowRefs.D = null;
            }
        });

        debugLog(`Window ${currentWindowType} initialized`);
    </script>
</body>
</html>