src/js/pannellum.js
function processOptions(isPreview) {
    isPreview = isPreview ? isPreview : false;

    // Process preview first so it always loads before the browser hits its
    // maximum number of connections to a server as can happen with cubic
    // panoramas
    if (isPreview && 'preview' in config) {
        var p = config.preview;
        if (config.basePath && !absoluteURL(p))
            p = config.basePath + p;
        preview = document.createElement('div');
        preview.className = 'pnlm-preview-img';
        preview.style.backgroundImage = "url('" + sanitizeURLForCss(p) + "')";
        renderContainer.appendChild(preview);
    }

    // Handle different preview values
    var title = config.title,
        author = config.author;
    if (isPreview) {
        if ('previewTitle' in config)
            config.title = config.previewTitle;
        if ('previewAuthor' in config)
            config.author = config.previewAuthor;
    }

    // Reset title / author display
    if (!config.hasOwnProperty('title'))
        infoDisplay.title.innerHTML = '';
    if (!config.hasOwnProperty('author'))
        infoDisplay.author.innerHTML = '';
    if (!config.hasOwnProperty('title') && !config.hasOwnProperty('author'))
        infoDisplay.container.style.display = 'none';

    // Fill in load button label and loading box text
    controls.load.innerHTML = '<p>' + config.strings.loadButtonLabel + '</p>';
    infoDisplay.load.boxp.innerHTML = config.strings.loadingLabel;

    // Process other options
    for (var key in config) {
      if (config.hasOwnProperty(key)) {
        switch(key) {
            case 'title':
                infoDisplay.title.innerHTML = escapeHTML(config[key]);
                infoDisplay.container.style.display = 'inline';
                break;
            
            case 'author':
                infoDisplay.author.innerHTML = config.strings.bylineLabel.replace('%s', escapeHTML(config[key]));
                infoDisplay.container.style.display = 'inline';
                break;
            
            case 'fallback':
                var link = document.createElement('a');
                link.href = sanitizeURL(config[key]);
                link.target = '_blank';
                link.textContent = 'Click here to view this panorama in an alternative viewer.';
                var message = document.createElement('p');
                message.textContent = 'Your browser does not support WebGL.'
                message.appendChild(document.createElement('br'));
                message.appendChild(link);
                infoDisplay.errorMsg.innerHTML = ''; // Removes all children nodes
                infoDisplay.errorMsg.appendChild(message);
                break;
            
            case 'hfov':
                setHfov(Number(config[key]));
                break;
            
            case 'autoLoad':
                if (config[key] === true && renderer === undefined) {
                    // Show loading box
                    infoDisplay.load.box.style.display = 'inline';
                    // Hide load button
                    controls.load.style.display = 'none';
                    // Initialize
                    init();
                }
                break;
            
            case 'showZoomCtrl':
                if (config[key] && config.showControls != false) {
                    // Show zoom controls
                    controls.zoom.style.display = 'block';
                } else {
                    // Hide zoom controls
                    controls.zoom.style.display = 'none';
                }
                break;

            case 'showFullscreenCtrl':
                if (config[key] && config.showControls != false && ('fullscreen' in document || 'mozFullScreen' in document ||
                    'webkitIsFullScreen' in document || 'msFullscreenElement' in document)) {
                    
                    // Show fullscreen control
                    controls.fullscreen.style.display = 'block';
                } else {
                    // Hide fullscreen control
                    controls.fullscreen.style.display = 'none';
                }
                break;

            case 'hotSpotDebug':
                if (config[key])
                    hotSpotDebugIndicator.style.display = 'block';
                else
                    hotSpotDebugIndicator.style.display = 'none';
                break;

            case 'showControls':
                if (!config[key]) {
                    controls.orientation.style.display = 'none';
                    controls.zoom.style.display = 'none';
                    controls.fullscreen.style.display = 'none';
                }
                break;

            case 'orientationOnByDefault':
                if (config[key]) {
                    if (orientationSupport === undefined)
                        startOrientationIfSupported = true;
                    else if (orientationSupport === true)
                        startOrientation();
                }
                break;
        }
      }
    }

    if (isPreview) {
        // Restore original values if changed for preview
        if (title)
            config.title = title;
        else
            delete config.title;
        if (author)
            config.author = author;
        else
            delete config.author;
    }
}
function processOptions(isPreview) {
    isPreview = isPreview ? isPreview : false;

    // Process preview first so it always loads before the browser hits its
    // maximum number of connections to a server as can happen with cubic
    // panoramas
    if (isPreview && 'preview' in config) {
        var p = config.preview;
        if (config.basePath && !absoluteURL(p))
            p = config.basePath + p;
        preview = document.createElement('div');
        preview.className = 'pnlm-preview-img';
        preview.style.backgroundImage = "url('" + sanitizeURLForCss(p) + "')";
        renderContainer.appendChild(preview);
    }

    // Handle different preview values
    var title = config.title,
        author = config.author;
    if (isPreview) {
        if ('previewTitle' in config)
            config.title = config.previewTitle;
        if ('previewAuthor' in config)
            config.author = config.previewAuthor;
    }

    // Reset title / author display
    if (!config.hasOwnProperty('title'))
        infoDisplay.title.innerHTML = '';
    if (!config.hasOwnProperty('author'))
        infoDisplay.author.innerHTML = '';
    if (!config.hasOwnProperty('title') && !config.hasOwnProperty('author'))
        infoDisplay.container.style.display = 'none';

    // Fill in load button label and loading box text
    controls.load.innerHTML = '<p>' + config.strings.loadButtonLabel + '</p>';
    infoDisplay.load.boxp.innerHTML = config.strings.loadingLabel;

    // Process other options
    for (var key in config) {
      if (config.hasOwnProperty(key)) {
        switch(key) {
            case 'title':
                infoDisplay.title.innerHTML = escapeHTML(config[key]);
                infoDisplay.container.style.display = 'inline';
                break;
            
            case 'author':
                infoDisplay.author.innerHTML = config.strings.bylineLabel.replace('%s', escapeHTML(config[key]));
                infoDisplay.container.style.display = 'inline';
                break;
            
            case 'fallback':
                var link = document.createElement('a');
                link.href = sanitizeURL(config[key]);
                link.target = '_blank';
                link.textContent = 'Click here to view this panorama in an alternative viewer.';
                var message = document.createElement('p');
                message.textContent = 'Your browser does not support WebGL.'
                message.appendChild(document.createElement('br'));
                message.appendChild(link);
                infoDisplay.errorMsg.innerHTML = ''; // Removes all children nodes
                infoDisplay.errorMsg.appendChild(message);
                break;
            
            case 'hfov':
                setHfov(Number(config[key]));
                break;
            
            case 'autoLoad':
                if (config[key] === true && renderer === undefined) {
                    // Show loading box
                    infoDisplay.load.box.style.display = 'inline';
                    // Hide load button
                    controls.load.style.display = 'none';
                    // Initialize
                    init();
                }
                break;
            
            case 'showZoomCtrl':
                if (config[key] && config.showControls != false) {
                    // Show zoom controls
                    controls.zoom.style.display = 'block';
                } else {
                    // Hide zoom controls
                    controls.zoom.style.display = 'none';
                }
                break;

            case 'showFullscreenCtrl':
                if (config[key] && config.showControls != false && ('fullscreen' in document || 'mozFullScreen' in document ||
                    'webkitIsFullScreen' in document || 'msFullscreenElement' in document)) {
                    
                    // Show fullscreen control
                    controls.fullscreen.style.display = 'block';
                } else {
                    // Hide fullscreen control
                    controls.fullscreen.style.display = 'none';
                }
                break;

            case 'hotSpotDebug':
                if (config[key])
                    hotSpotDebugIndicator.style.display = 'block';
                else
                    hotSpotDebugIndicator.style.display = 'none';
                break;

            case 'showControls':
                if (!config[key]) {
                    controls.orientation.style.display = 'none';
                    controls.zoom.style.display = 'none';
                    controls.fullscreen.style.display = 'none';
                }
                break;

            case 'orientationOnByDefault':
                if (config[key]) {
                    if (orientationSupport === undefined)
                        startOrientationIfSupported = true;
                    else if (orientationSupport === true)
                        startOrientation();
                }
                break;
        }
      }
    }

    if (isPreview) {
        // Restore original values if changed for preview
        if (title)
            config.title = title;
        else
            delete config.title;
        if (author)
            config.author = author;
        else
            delete config.author;
    }
}
Processes configuration options.
@param {boolean} [isPreview] - Whether or not the preview is being displayed
@private