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    <p>One way to handle this might be to extend the XmlHTTPRequest object with an explicit timeout method, then use that to determine if you're working in offline mode (that is, for browsers that don't support navigator.onLine). Here's how I implemented Ajax timeouts on one site (a site that uses the <a href="http://prototypejs.org/&quot;Prototype&quot;" rel="nofollow noreferrer">Prototype</a> library). After 10 seconds (10,000 milliseconds), it aborts the call and calls the onFailure method.</p> <pre><code>/** * Monitor AJAX requests for timeouts * Based on the script here: http://codejanitor.com/wp/2006/03/23/ajax-timeouts-with-prototype/ * * Usage: If an AJAX call takes more than the designated amount of time to return, we call the onFailure * method (if it exists), passing an error code to the function. * */ var xhr = { errorCode: 'timeout', callInProgress: function (xmlhttp) { switch (xmlhttp.readyState) { case 1: case 2: case 3: return true; // Case 4 and 0 default: return false; } } }; // Register global responders that will occur on all AJAX requests Ajax.Responders.register({ onCreate: function (request) { request.timeoutId = window.setTimeout(function () { // If we have hit the timeout and the AJAX request is active, abort it and let the user know if (xhr.callInProgress(request.transport)) { var parameters = request.options.parameters; request.transport.abort(); // Run the onFailure method if we set one up when creating the AJAX object if (request.options.onFailure) { request.options.onFailure(request.transport, xhr.errorCode, parameters); } } }, // 10 seconds 10000); }, onComplete: function (request) { // Clear the timeout, the request completed ok window.clearTimeout(request.timeoutId); } }); </code></pre>
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    1. POWhat is the best method to detect offline mode in the browser?
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    1. USAndrew Hedges
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    1. COThis is a way to detect that a connection to the server failed, not that the browser is offline. If that's good enough for you, most libraries have a way to set a handler for all failed Ajax requests. However, navigator.online is the property that tells you that you are connected to the internet.
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      1. USJuan Mendes
    2. COwindow.navigator.onLine only tells if the browser is set to offline -mode (at least in Firefox). If the Internet connection has been lost, it will still show true, for me at least.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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