jQuery 上传进度和 AJAX 文件上传

本文介绍了jQuery 上传进度和 AJAX 文件上传的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

好像我没有清楚地传达我的问题.我需要发送一个文件(使用 AJAX)，我需要使用 Nginx HttpUploadProgressModule.我需要一个很好的解决方案来解决这个问题.我曾尝试使用 jquery.uploadprogress 插件，但我发现自己必须重写其中的大部分内容才能使其在所有浏览器中工作并使用 AJAX 发送文件.

It seems like I have not clearly communicated my problem. I need to send a file (using AJAX) and I need to get the upload progress of the file using the Nginx HttpUploadProgressModule. I need a good solution to this problem. I have tried with the jquery.uploadprogress plugin, but I am finding myself having to rewrite much of it to get it to work in all browsers and to send the file using AJAX.

我需要的只是执行此操作的代码，并且它需要在所有主要浏览器(Chrome、Safari、FireFox 和 IE)中运行.如果我能得到一个可以处理多个文件上传的解决方案就更好了.

All I need is the code to do this and it needs to work in all major browsers (Chrome, Safari, FireFox, and IE). It would be even better If I could get a solution that will handle multiple file uploads.

Uploading files is actually possible with AJAX these days. Yes, AJAX, not some crappy AJAX wannabes like swf or java.

这个例子可能对你有帮助:https://webblocks.nl/tests/ajax/file-drag-drop.html

This example might help you out: https://webblocks.nl/tests/ajax/file-drag-drop.html

(它还包括拖放界面，但很容易被忽略.)

(It also includes the drag/drop interface but that's easily ignored.)

基本上归结为:

<input id="files" type="file" />

<script>
document.getElementById('files').addEventListener('change', function(e) {
    var file = this.files[0];
    var xhr = new XMLHttpRequest();
    (xhr.upload || xhr).addEventListener('progress', function(e) {
        var done = e.position || e.loaded
        var total = e.totalSize || e.total;
        console.log('xhr progress: ' + Math.round(done/total*100) + '%');
    });
    xhr.addEventListener('load', function(e) {
        console.log('xhr upload complete', e, this.responseText);
    });
    xhr.open('post', '/URL-HERE', true);
    xhr.send(file);
});
</script>

(演示:http://jsfiddle.net/rudiedirkx/jzxmro8r/)

所以基本上归结为这个 =)

So basically what it comes down to is this =)

xhr.send(file);

其中 file 是 Blob 的类型:http://www.w3.org/TR/FileAPI/

Where file is typeof Blob: http://www.w3.org/TR/FileAPI/

另一种(更好的 IMO)方法是使用 FormData.这允许您 1) 命名文件，例如在表单中；2) 发送其他内容(也包括文件)，例如在表单中.

Another (better IMO) way is to use FormData. This allows you to 1) name a file, like in a form and 2) send other stuff (files too), like in a form.

var fd = new FormData;
fd.append('photo1', file);
fd.append('photo2', file2);
fd.append('other_data', 'foo bar');
xhr.send(fd);

FormData 使服务器代码更清晰，更向后兼容(因为请求现在具有与普通表单完全相同的格式).

FormData makes the server code cleaner and more backward compatible (since the request now has the exact same format as normal forms).

所有这些都不是实验性的，而是非常现代的.Chrome 8+ 和 Firefox 4+ 知道该做什么，但我不知道其他人.

All of it is not experimental, but very modern. Chrome 8+ and Firefox 4+ know what to do, but I don't know about any others.

这是我在 PHP 中处理请求(每个请求 1 张图像)的方式:

This is how I handled the request (1 image per request) in PHP:

if ( isset($_FILES['file']) ) {
    $filename = basename($_FILES['file']['name']);
    $error = true;

    // Only upload if on my home win dev machine
    if ( isset($_SERVER['WINDIR']) ) {
        $path = 'uploads/'.$filename;
        $error = !move_uploaded_file($_FILES['file']['tmp_name'], $path);
    }

    $rsp = array(
        'error' => $error, // Used in JS
        'filename' => $filename,
        'filepath' => '/tests/uploads/' . $filename, // Web accessible
    );
    echo json_encode($rsp);
    exit;
}

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上传进度和

jQuery 上传进度和 AJAX 文件上传

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