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POXmlHttpRequest.responseText while loading (readyState==3) in Chrome
 

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  1. POXmlHttpRequest.responseText while loading (readyState==3) in Chrome
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    <p>I am trying to "streaming" (from server to client) in Javascript by ajax (by XmlHttpRequest (=xhr). I am using modified handleResponse function described in <a href="https://stackoverflow.com/questions/1112413/cross-browser-implementation-of-http-streaming-push-ajax-pattern">Cross-browser implementation of &quot;HTTP Streaming&quot; (push) AJAX pattern</a></p> <pre><code>function handleResponse() { if (http.readyState != 4 &amp;&amp; http.readyState != 3) return; if (http.readyState == 3 &amp;&amp; http.status != 200) return; if (http.readyState == 4 &amp;&amp; http.status != 200) { clearInterval(pollTimer); inProgress = false; } // In konqueror http.responseText is sometimes null here... if (http.responseText === null) return; while (prevDataLength != http.responseText.length) { if (http.readyState == 4 &amp;&amp; prevDataLength == http.responseText.length) break; prevDataLength = http.responseText.length; var response = http.responseText.substring(nextLine); var lines = response.split('\n'); nextLine = nextLine + response.lastIndexOf('\n') + 1; if (response[response.length-1] != '\n') lines.pop(); for (var i = 0; i &lt; lines.length; i++) { // ... } } if (http.readyState == 4 &amp;&amp; prevDataLength == http.responseText.length) clearInterval(pollTimer); inProgress = false; } </code></pre> <p>With php script, which flushes me data (without ajax it really flushes data to browser while progressing)</p> <p>I have no problem in Firefox, but Google Chrome and IE give me an empty responseText while xhr.readyState equals to 3. I found that problem described in the Internet, but it didn't give me any solution.</p> <p>Do you know, how to pass by this implementation problem in Chrome? (w3c says, that responseText can't be NULL in readyState==3 - Chrome implemented this rule, but gives only empty string)</p> <p>And if you don't know, do you know any working solution in some products? (opensource frameworks, librararies etc.)</p> <p>Thanks a lot for your ideas.</p> <p><strong>Edit:</strong> The workaround is in creating iframe, call the script to iframe and flush data here and grab data by javascript from iframe. But this is not ajax solution. I really would like to see pure ajax solution.</p>
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    1. USJaroslav Moravec
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    1. COAre you sure you're setting a "Content-Type" of "text/plain" or "application/x-javascript" when you start your response from the server? Apparently the Webkit browsers insist upon that, or they might.
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    2. COI set content-type to "application/x-www-form-urlencoded". I tried - as you said - application/x-javascript, but this is not working at all.
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