PHP的Ajax上传进度条 [英] PHP Ajax Upload Progress Bar

问题描述

<form enctype="multipart/form-data" action="upload.php" method="POST">
<input name="uploaded" type="file" />
<input type="submit" value="Upload" />
</form>

<?php
if(isset($_REQUEST['submit'])){
   $target = "data/".basename( $_FILES['uploaded']['name']) ;
   move_uploaded_file($_FILES['uploaded']['tmp_name'], $target);
}
?>

我知道javascipt的，AJAX和JQuery的等得很好，我相信上传进度条可以使用PHP，Ajax和JavaScript等
创建  我很惊讶怎么去上传的大小（平均每个第二，我想知道，有多少文件被上传，有多少是剩余的，我认为它应该使用AJAX等有可能）上传过程中文件是过程

I know Javascipt, AJAX and JQuery etc very well and i believe upload progress bar can be created using PHP, AJAX and Javascript etc.
I am surprised how to get the size of upload (Mean in each second i want to know, how much file is uploaded and how much is remaining, i think it should be possible using AJAX etc) file during upload is in process.

下面是链接PHP手册，但我不明白，
<一href="http://php.net/manual/en/session.upload-progress.php">http://php.net/manual/en/session.upload-progress.php

here is link to PHP manual but i didn't understand that
http://php.net/manual/en/session.upload-progress.php

任何其他方法来使用PHP和AJAX，但不使用PHP的任何外部扩展显示上传进度条。我没有访问为php.ini

Any other method to show upload progress bar using PHP and AJAX but without use of any external extension of PHP. I don't have access to php.ini

推荐答案

PHP的文档是非常详细，它说

Introduction

The PHP Doc is very detailed it says

上传进度将在$ _SESSION全局可当上载过程中，并张贴了同名的变量时，作为session.upload_progress.name INI设置为。当PHP检测到此类POST请求，将填充在$ _SESSION数组，其中，该指数的session.upload_progress。preFIX和session.upload_progress.name INI选项连接的值。关键是典型的检索阅读这些INI设置，即

The upload progress will be available in the $_SESSION superglobal when an upload is in progress, and when POSTing a variable of the same name as the session.upload_progress.name INI setting is set to. When PHP detects such POST requests, it will populate an array in the $_SESSION, where the index is a concatenated value of the session.upload_progress.prefix and session.upload_progress.name INI options. The key is typically retrieved by reading these INI settings, i.e.

所有你所需要的信息是所有准备在PHP会话命名

All the information you require is all ready in the PHP session naming

• START_TIME
• CONTENT_LENGTH
• bytes_processed
• 文件信息（支持多种）

所有你需要的是这些信息提取出来，并在你的HTML表单中显示出来。

All you need is to extract this information and display it in your HTML form.

<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css"
rel="stylesheet" type="text/css" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>
<script type="text/javascript">
    var intval = null;
    var percentage = 0 ;
    function startMonitor() {
        $.getJSON('b.php',
        function (data) {
            if (data) {
                percentage = Math.round((data.bytes_processed / data.content_length) * 100);
                $("#progressbar").progressbar({value: percentage});
                $('#progress-txt').html('Uploading ' + percentage + '%');

            }
            if(!data || percentage == 100){
                $('#progress-txt').html('Complete');
                stopInterval();
            }
        });
    }

    function startInterval() {
        if (intval == null) {
            intval = window.setInterval(function () {startMonitor()}, 200)
        } else {
            stopInterval()
        }
    }

    function stopInterval() {
        if (intval != null) {
            window.clearInterval(intval)
            intval = null;
            $("#progressbar").hide();
            $('#progress-txt').html('Complete');
        }
    }

    startInterval();
</script>

b.php

session_start();
header('Content-type: application/json');
echo json_encode($_SESSION["upload_progress_upload"]);

示例使用PHP会议上传进度

下面是从 PHP会话上传进度更好的优化版本

Example with PHP Session Upload Progress

Here is a better optimized version from PHP Session Upload Progress

$('#fileupload').bind('fileuploadsend', function (e, data) {
    // This feature is only useful for browsers which rely on the iframe transport:
    if (data.dataType.substr(0, 6) === 'iframe') {
        // Set PHP's session.upload_progress.name value:
        var progressObj = {
            name: 'PHP_SESSION_UPLOAD_PROGRESS',
            value: (new Date()).getTime()  // pseudo unique ID
        };
        data.formData.push(progressObj);
        // Start the progress polling:
        data.context.data('interval', setInterval(function () {
            $.get('progress.php', $.param([progressObj]), function (result) {
                // Trigger a fileupload progress event,
                // using the result as progress data:
                e = document.createEvent('Event');
                e.initEvent('progress', false, true);
                $.extend(e, result);
                $('#fileupload').data('fileupload')._onProgress(e, data);
            }, 'json');
        }, 1000)); // poll every second
    }
}).bind('fileuploadalways', function (e, data) {
    clearInterval(data.context.data('interval'));
});

progress.php

$s = $_SESSION['upload_progress_'.intval($_GET['PHP_SESSION_UPLOAD_PROGRESS'])];
$progress = array(
        'lengthComputable' => true,
        'loaded' => $s['bytes_processed'],
        'total' => $s['content_length']
);
echo json_encode($progress);

其他实施例

• 用PHP跟踪上传进度和JavaScript
• <一个href="https://github.com/chemicaloliver/PHP-5.4-Upload-Progress-Example">PHP-5.4-Upload-Progress-Example

Other Examples

• Tracking Upload Progress with PHP and JavaScript
• PHP-5.4-Upload-Progress-Example

这篇关于PHP的Ajax上传进度条的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！