我使用iframe构建了一个照片提交。问题是如何知道文件是否由于新网络延迟或断开连接而无法提交。这样的事情有活动吗？或者，如果时间太长，如果有办法取消，我就取消它。我知道什么时候完成，因为来自服务器的回复是一个javascript函数，它被加载为recevied，但如果我没有收到任何东西该怎么办！
<form action="iframe.php" target="my-iframe" method="post">
<label for="text">Some text:</label>
<input type="file" name="file" id="file">
<input type="submit" value="post">
</form>
<iframe name="my-iframe" src="iframe.php"></iframe>
<script>
function img_upload_done(opn,img,photo_number){ // opn holds boolen if img uploaded succefully
//do something
}
</script>
<?php
//getting the directory of the this file
$destination_path = getcwd().DIRECTORY_SEPARATOR;
$name = rand (100,1000);
$result = 0;
$filename=$_FILES['file']['name'];
$ext = pathinfo($filename, PATHINFO_EXTENSION) ;
// setting up the directory of the file uploaded
$target_path = $destination_path . $name .".". $ext;
//making sure the file has been uploaded in the specified directory
if(@move_uploaded_file($_FILES['file']['tmp_name'], $target_path)) {
$result = 1;
}
sleep(0);
?>
<script language="javascript" type="text/javascript">
window.top.window.img_upload_done(<?php echo $result.",'"".$name .".". $ext."'",".$_POST["photo-number"]; ?>);
</script>
<?php
//This function separates the extension from the rest of the file name and returns it
function findexts ($filename) {
$filename = strtolower($filename) ;
$exts = split("[/''.]", $filename) ;
$n = count($exts)-1;
$exts = $exts[$n];
return $exts;
}
//This applies the function to our file
?>
您可以使用window.postMessage（）函数向页面发送失败或成功消息。
在你的主页上，它可能看起来像这样：
window.addEventListener("message", receiveMessage, false);
function receiveMessage(event)
{
var origin = event.origin || event.originalEvent.origin; // For Chrome, the origin property is in the event.originalEvent object.
if (origin !== "http://www.your-url.com")
return;
// ...
}
在iFrame中，在文件保存（或失败）后，您可以执行以下操作：
// where to send messages with postMessage
var target_origin = 'http://www.your-url.com';
parent.postMessage( {'success': 'true'}, target_origin );
更多信息：https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage