如何解决AJAX PHP脚本输出的连续响应
我的PHP脚本的AJAX响应有问题...
我创建了“ Status” div,我想在其中输出PHP脚本的响应。它运作良好,但是只有在整个脚本完成后才显示响应,我想输出每个“实时”回显。.
这是我的文件:
form.php
<!-- left column -->
<div class="col-md-6">
<!-- general form elements -->
<div class="card card-primary">
<div class="card-header">
<h3 class="card-title"><?php echo $xmlData->name ?></h3>
</div>
<!-- /.card-header -->
<!-- form start -->
<form id="upload_form" enctype="multipart/form-data" method="post">
<div class="card-body">
<div class="form-group">
<label for="debFile">Deb file</label>
<span id="debMSG"></span>
<div class="input-group">
<div class="custom-file">
<input name="debFile" type="file" class="custom-file-input" id="debFile">
<label class="custom-file-label" for="debFile">Choose .deb file</label>
</div>
</div>
</div>
<div class="form-group">
<label for="version">Version</label>
<input type="text" name="version" id="version" class="form-control" value="<?php echo ver_up($xmlData->changelogs->change->version); ?>">
</div>
<div class="form-group">
<label for="log">Log</label>
<input type="text" name="log" id="log" class="form-control" value="Bug fix">
</div>
<div class="form-check">
<input name="tweet" type="checkbox" class="form-check-input" id="tweet" value="1">
<label class="form-check-label" for="tweet">Auto-post on Twitter</label>
</div>
</div>
<!-- /.card-body -->
<div class="card-footer">
<button id="submit" name="upload" type="submit" class="btn btn-primary">Update</button>
</div>
</form>
</div>
<!-- /.card -->
</div>
<!-- Status -->
<div id="status" class="col-md-6" style="display:none;">
<div class="card card-default">
<div class="card-header">
<h3 class="card-title">Status:</h3>
</div>
<div class="alert alert-default">
<ul id="output" class="list-group"></ul>
</div>
</div>
</div>
<!--/.col (right) -->
form.php中的ajax
<script type="text/javascript">
$(document).ready(function () {
bsCustomFileInput.init();
const Toast = Swal.mixin({
toast: true,position: 'top-end',showConfirmButton: false,timer: 5000
});
$(document).on('submit','#upload_form',function(event){
event.preventDefault();
if($('#debFile').val() == '')
{
$('#debMSG').html('<div class="alert alert-danger">Enter .deb file!</div>');
$('#debMSG').show();
setTimeout(function() {
$('#debMSG').fadeOut('fast');
},5000);
return false;
}
else
{
$.ajax({
type: 'POST',url: 'scripts/test.php',data: new FormData(this),// async: true,cache: false,processData: false,contentType: false,beforeSend:function()
{
$('#debMSG').hide();
$('#submit').attr('disabled','disabled');
// $('#status').fadeIn('slow');
}
})
.done(function(data) {
// console.log(data);
$('#output').append(data);
$('#status').fadeIn('slow');
// if(!data.success){
// $('#submit').removeClass('btn-primary').addClass('btn-danger');
// $('#submit').attr('disabled',false);
// $('#submit').removeAttr('name type');
// $('#submit').attr('onClick','location.reload();');
// $('#submit').html('Reload');
// Toast.fire({
// icon: 'error',// title: 'There was an error while updating tweak!'
// })
// } else {
$('#submit').removeClass('btn-primary').addClass('btn-success');
$('#submit').attr('disabled',false);
$('#submit').removeAttr('name type');
$('#submit').attr('onClick','window.location.href = "manage-packages.php";');
$('#submit').html('Finish');
Toast.fire({
icon: 'success',title: 'Tweak has been successfully updated!'
})
// }
})
.fail(function(data) {
console.log(data);
$('#output').append("There was an error while updating tweak!");
// $('#output').removeClass('alert-success').addClass('alert-danger');
$('#status').fadeIn('slow');
$('#submit').removeClass('btn-primary').addClass('btn-danger');
$('#submit').attr('disabled',false);
$('#submit').removeAttr('name type');
$('#submit').attr('onClick','location.reload();');
$('#submit').html('Reload');
Toast.fire({
icon: 'error',title: 'There was an error while updating tweak!'
})
});
}
});
});
</script>
test.php
<?php
header('Content-type: text/html; charset=utf-8');
require_once("../../src/config-ssh.php");
require_once("../../src/functions.php");
$deb_dir = "/var/www/html/debs/";
$repo_dir = "/var/www/html/";
function output($val) {
echo nl2br ($val);
flush();
ob_flush();
sleep(1);
}
try {
if (isset($_FILES["debFile"]["name"])) {
$debFile = $_FILES["debFile"]["tmp_name"];
$deb_file = $deb_dir . basename($_FILES["debFile"]["name"]);
if (!file_exists($deb_file)) {
output("<li class=\"list-group-item list-group-item-success\">DEB file \"". basename( $_FILES["debFile"]["name"]). "\" has been uploaded.</li>");
} else {
throw new Exception("<li class=\"list-group-item list-group-item-danger\">DEB file \"". basename( $_FILES["debFile"]["name"]). "\" already exists!</li>");
}
} else {
throw new Exception("<li class=\"list-group-item list-group-item-danger\">You didn't choose any DEB file!</li>");
}
preg_match('/(.*)_(.*)_(.*)\.deb/',basename($_FILES["debFile"]["name"]),$deb_reg);
$dirname = $deb_reg[1];
$prev_ver = ver_down($deb_reg[2]);
$exten = $deb_reg[3] . ".deb";
$prev_deb_name = $dirname."_".$prev_ver."_".$exten;
$prev_deb = $deb_dir . $prev_deb_name;
if (isset($_POST['version']) && isset($_POST['log'])) {
output("<li class=\"list-group-item list-group-item-success\">Values were added to XML!</li>");
}
if (file_exists($prev_deb)) {
output("<li class=\"list-group-item list-group-item-success\">Previous version of DEB file (\"". $prev_deb_name . "\") was deleted!</li>");
} else {
throw new Exception("<li class=\"list-group-item list-group-item-danger\">DEB file \"". $prev_deb_name . "\" wasn't deleted!</li>");
}
// Run a command
output("<li class=\"list-group-item list-group-item-info\">Running Repo update script...</li>");
output("<li class=\"list-group-item list-group-item-success\">Script finished successfully.</li>");
// Auto-post Tweet
if (isset($_POST['tweet'])) {
output("$msg");
output("<li class=\"list-group-item list-group-item-success\">Tweet has been successfully posted.</li>");
}
exit();
}
catch( Exception $e ) {
$message = $e->getMessage();
die( "ERROR: " . $message );
}
?>
我已经尝试过一些教程,但是没有一个正在为此工作...
感谢您的建议!
解决方法
您需要将处理程序绑定到XmlHttpRequest对象的progress
事件。 jQuery不提供执行此操作的本机接口,但是如果您仍想使用jQuery而不是直接使用XmlHttpRequest对象来进行AJAX调用,则可以使用xhr
回调函数来更改基础XmlHttpRequest对象,并添加处理程序这样:
$.ajax({
...
xhr: function() {
// get the native XmlHttpRequest object
const xhr = $.ajaxSettings.xhr();
// set the onprogress event handler
xhr.onprogress = function() {
// replace the '#output' element inner HTML with the received part of the response
$('#output').html(xhr.responseText);
}
return xhr;
}
})
.done(function(data) {
...
})
.fail(function(data) {
...
});
很难从XMLHttpRequest标准的current version中弄清楚,但是archived one说此事件大约每50毫秒或接收到的每个字节触发一次,以频率最低的那个为准。>
您应该对JavaScript代码进行的其他更改是
- 取消注释
$('#status').fadeIn('slow');
函数中的beforeSend
行并将其从其他函数中删除; - 从
$('#output').append(data);
事件处理函数中删除done
行,应该已经通过onprogress
处理函数注入了所有接收到的数据。
最后但并非最不重要的部分是关于缓冲。我假定您将nginx与PHP-FPM结合使用,因为您将nginx
标记添加到了问题中。您已经使用了flush()
和ob_flush()
PHP函数,并且正确的是,您需要同时使用这两个函数才能刷新PHP缓冲区。但是,还有另外一种缓冲机制-nginx本身。您可以使用fastcgi_buffering off;
指令完全关闭nginx FastCGI缓冲,但这似乎不是一个好主意。幸运的是,nginx允许通过特殊的X-Accel-Buffering
标头关闭响应缓冲,因此您的AJAX PHP处理程序应以
<?php
header('Content-type: text/html; charset=utf-8');
header('X-Accel-Buffering: no');
...
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