StackOverflow2013

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plurals

PO
primarykey
Id
11679179
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-07-26T22:52:25.203
FavoriteCount
0
LastActivityDate
2012-07-26T22:52:25.203
LastEditDate
2017-05-23T11:48:14.160
LastEditorUserId
-1
OwnerUserId
1350193
ParentId
11672469
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
You can't stop the loading of images, however it is possible to cancel an ordinary AJAX request (<a href="https://stackoverflow.com/questions/446594/abort-ajax-requests-using-jquery">see this solution on SO</a>). Usually images aren't loaded via AJAX for good reasons, but you can work around this by sending the image as a base64 encoded string. So you let PHP read the image and convert it to base64. This string can be sent to JS via AJAX and "directly" drawn to your canvas (<a href="https://stackoverflow.com/questions/4773966/drawing-an-image-from-a-data-url-to-a-canvas">solution on SO</a>). I really don't know if this is the best way to do this... Anyways, see if this works for you: HTML: <pre><code><canvas id="background" width="800" height="600"></canvas> </code></pre> JavaScript: (using jQuery) <pre><code>function drawBackgroundImage(src) { var image = $("<img/>").load(function(){ $("canvas#background")[0].getContext("2d").drawImage(image[0], 0, 0); }).attr("src", src); } function loadImage(highres, lowres) { var t; var xhr = $.ajax({ type: "POST", url: "load_image.php", data: "image=" + highres, success: function(imgbinary){ if (imgbinary != "") { clearTimeout(t); drawBackgroundImage(imgbinary); } } }); t = setTimeout(function(){ xhr.abort(); drawBackgroundImage(lowres); }, 5000); } loadImage("path/to/highres.png", "path/to/low_res.png"); </code></pre> PHP: (load_image.php) (This uses part of a <a href="http://www.php.net/manual/de/function.base64-encode.php#107705" rel="nofollow noreferrer">function from the PHP manual</a>.) <pre><code><?php $result = ""; @ob_start(); if (isset($_POST["image"])) { $filename = $_POST["image"]; if (file_exists($filename)) { $filetype = pathinfo($filename, PATHINFO_EXTENSION); $imgbinary = fread(fopen($filename, "r"), filesize($filename)); $result = "data:image/".$filetype.";base64,".base64_encode($imgbinary); } } @ob_end_clean(); echo $result; ?> </code></pre>
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Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POHow to load an other image, if the current image loads slow?
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USCommunity
UserOwnerUserId
1. USAletheios
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PostLinksRelatedPostIdPostId
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PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

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