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    <p>Have you found a way to do AJAX calls during the transaction? I haven't finished reading the whole spec, but so far it looks like once your <code>SQLTransactionCallback</code> or <code>SQLTransactionSyncCallback</code> returns, you can’t add any more stuff to the transaction — or can you? Maybe from the results callback?</p> <p>Edit: Now that I look again, the spec (which contains many fewer errors than the Apple document you linked to, but is not as easy to read) <a href="http://dev.w3.org/html5/webdatabase/#executing-sql-statements" rel="nofollow">says this</a>:</p> <blockquote> <ol> <li>If the method [<code>executeSql</code>] was not invoked during the execution of a <code>SQLTransactionCallback</code>, <code>SQLStatementCallback</code>, or <code>SQLStatementErrorCallback</code> then raise an <code>INVALID_STATE_ERR</code> exception.</li> </ol> </blockquote> <p>So I think that means there's no way to do it.</p> <p>Further edit: No, wait! As long as the <code>SQLStatementCallback</code> takes <em>some</em> time to get called, you could busy-wait doing <code>select 3 + 4</code> over and over again, each time from the statement callback of the previous <code>select 3 + 4</code>, until your AJAX call sets a flag somewhere that has the data you want. This is terrible programming (it'll eat lots of CPU for no good reason, might block lower-priority tasks like redisplaying the page) but I think it's probably the only way to keep a transaction open for an arbitrary period of time. Too bad you can't <code>select 3 + 4, sleep(1)</code> in SQLite.</p> <p>In general SQLite (the underlying storage engine here) rolls back uncompleted transactions. I haven’t yet tested the page-reload error case you're asking about. I would be very surprised if it was committed.</p> <p>By the way, thank you very much for posting this question. I had been trying to figure out how to get the transaction to rollback, even though <a href="http://dev.w3.org/html5/webdatabase/#processing-model" rel="nofollow">it is meticulously documented</a> in the original spec.</p>
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    1. POHTML 5 Web SQL Database Transaction commit or rollback when refreshing page
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    1. USKragen Javier Sitaker
    1. USKragen Javier Sitaker
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    1. COI tried saving the transaction object into a variable before the AJAX call and after it returns use it to execute another query. But I get a DOM exception stating that the transaction object cannot be used anymore. This only occurs after AJAX calls, with synchronous functions/callbacks I can pass it as parameter and run multiple queries in a single transaction. I haven't tried calling the AJAX synchronously (using jQuery for example), maybe that would maintain the transaction object in a valid state.
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    2. COSee my edit above about holding the transaction open. I don't think jQuery supports synchronous AJAX; it freezes the page and (outside of Chrome) the whole browser until complete.
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      1. USKragen Javier Sitaker
 

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