StackOverflow2013

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primarykey
Id
17644837
data
AcceptedAnswerId
0
AnswerCount
0
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CommentCount
2
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CreationDate
2013-07-14T23:30:51.640
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0
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2013-07-14T23:30:51.640
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0
OwnerUserId
201952
ParentId
10248944
PostTypeId
2
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0
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0
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text
Body
This is actually rather simple to accomplish. Make an AJAX request for the image with the <code>Cache-Control</code> header set to <code>max-age=0</code>. The server must respond with either the updated image (and a new set of cache headers), or with a 304 containing a <code>Cache-Control</code> header like <code>public, max-age=123</code>. The 304 with a <code>Cache-Control</code> header is very important because it instructs the browser to update the freshness information associated with the resource. When the request completes, remove the old <code><img></code> element from the DOM and reinsert a new one pointing to the same <code>src</code>. This works because the request <code>Cache-Control</code> header tells the browser to ignore its cache and go to the network. When the browser gets a response back, it updates its cache – even though you don't actually do anything with the AJAX results. Now when you remove the old element and insert a new one, the browser grabs the recently updated image directly from its cache. In Chrome's network inspector, you see two requests: the AJAX request, then the request generated by reinserting the <code><img></code> element. However, if the server has set the <code>Cache-Control</code> headers properly, the second "request" is fulfilled by the browser's cache, and nothing is actually sent over the wire. <pre><code>function updateImage(el) { el = $(el); var src = el.attr('src'); $.ajax({ url: src, headers: { 'Cache-Control': 'max-age=0' }, success: function() { var parent = el.parent(); el.remove(); // this assumes that the <img> has no siblings and no attributes/classes/etc... parent.append('<img>').attr('src',src); } }); } </code></pre>
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1. This table or related slice is empty.
PostParentId
1. POCause browser to revalidate (but not necessarily refetch) an image
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1. PTAnswer
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1. This table or related slice is empty.
UserOwnerUserId
1. USjosh3736
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