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我正在关注有关如何使用进度 (%) 指示器制作 javascript/ajax 上传系统的教程。我已成功为其添加了一个 CSS 进度条指示器。但是我有一个我无法解决的问题是如何设置上传条件，例如：类型，文件大小，文件设置，....这是我的代码（upload.php）

<?php
foreach($_FILES['file']['name'] as $key => $name){
        if ($_FILES['file']['error'][$key] == 0 && move_uploaded_file($_FILES['file']['tmp_name'][$key], "files/{$name}")){
            $uploaded[] = $name;
        }
    }
    if(!empty($_POST['ajax'])){
        die(json_encode($uploaded));
    }
?>

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <script type="text/javascript" src="upload.js"></script>
</head>
<body>
        <div id="uploaded">
            <?php

            if (!empty($uploaded)){
                foreach ($uploaded as $name){
                    echo '<div><a href="files/',$name,'">',$name,'</a></div>';
                }
            }

            ?>
             </div>
<div id="upload_progress"></div>
        <div>
            <form action="" method="post" enctype="multipart/form-data">
<input type="file" id="file" name="file[]" />
<input type="submit" id="submit" value="upload" />
</form>

这是javascript文件（upload.js）：

var handleUpload = function(event){
    event.preventDefault();
    event.stopPropagation();

    var fileInput = document.getElementById('file');

    var data = new FormData();

    data.append('ajax', true);
    for (var i = 0; i < fileInput.files.length; ++i){
        data.append('file[]', fileInput.files[i]);
    }   

    var request = new XMLHttpRequest();

    request.upload.addEventListener('progress', function(event){
        if(event.lengthComputable){
            var percent = event.loaded / event.total;
            var progress = document.getElementById('upload_progress');

            while (progress.hasChildNodes()){
                progress.removeChild(progress.firstChild);
            }
            progress.appendChild(document.createTextNode(Math.round(percent * 100) +' %'));
            document.getElementById("loading-progress-17").style.width= Math.round(percent * 100) +'%';
        }
    });
    request.upload.addEventListener('load', function(event){
        document.getElementById('upload_progress').style.display = 'none';
    });
    request.upload.addEventListener('error', function(event){
        alert('Upload failed');
    });
    request.addEventListener('readystatechange', function(event){
        if (this.readyState == 4){
            if(this.status == 200){
                var links = document.getElementById('uploaded');
                var uploaded = eval(this.response);
                var div, a;
                for (var i = 0; i < uploaded.length; ++i){
                    div = document.createElement('div');
                    a = document.createElement('a');
                    a.setAttribute('href', 'files/' + uploaded[i]);
                    a.appendChild(document.createTextNode(uploaded[i]));
                    div.appendChild(a);
                    links.appendChild(div);
                }
            }else{
                console.log('server replied with HTTP status ' + this.status);
            }
        }
    });
    request.open('POST', 'upload.php');
    request.setRequestHeader('Cache-Control', 'no-cache');
    document.getElementById('upload_progress').style.display = 'block';
    request.send(data);

}

window.addEventListener('load', function(event){

    var submit = document.getElementById('submit');
    submit.addEventListener('click', handleUpload);
});

我只需要和如何检查文件大小小于 50MB 的示例，我可以自己进行其他检查，我只是不知道如何检查此上传系统中的条件。提前致谢

4

1 回答 1

1

如果你想检查大小之类的东西，你可以用你的代码很容易地实现它：

看看你的代码中的这些行：

for (var i = 0; i < fileInput.files.length; ++i){
    data.append('file[]', fileInput.files[i]);
}

这是将文件添加到 FormData 的位置，然后将其提交给服务器。您可以在此处添加条件，例如尺寸检查：

for (var i = 0; i < fileInput.files.length; ++i){
    //file.size is given in bytes
    if(fileInput.files[i].size <= MAX_FILESIZE_IN_BYTES){
        data.append('file[]', fileInput.files[i]);
    }
}

我希望这有帮助。

于 2013-09-14T05:00:15.530 回答