Question

我正在尝试显示到目前为止使用javascript和php上传文件时的进度。下面的代码有效，文件已上载，但是进度条不显示进度，到目前为止，总数为ID为load_n_total的p标签未显示任何内容。我已经测试了小文件和大至800MB的文件。

html
<!DOCTYPE html>
<html>
    <head>
        <script>
            function _(el) {
                return document.getElementById(el);
            }
            function uploadFile() {
                var file = _("file1").files[0];
                //alert(file.name+" | "+file.size+" | "+file.type);
                var formdata = new FormData();
                formdata.append("file1", file);
                var ajax = new XMLHttpRequest();
                ajax.upload.addEventListener("process", progressHandler, false);
                ajax.addEventListener("load", completeHander, false);
                ajax.addEventListener("error", errorHandler, false);
                ajax.addEventListener("abort", abortHandler, false);
                ajax.open("POST", "file_upload_parser.php");
                ajax.send(formdata);
            }
            function progressHandler(event) {
                _("loaded_n_total").innerHTML = "Uploaded "+event.loaded+" bytes of "+event.total;
                var percent = (event.loaded / event.total) * 100;
                _("progressBar").value = Math.round(percent);
                _("status").innerHTML = Math.round(percent)+"% uploaded... please wait";
            }
            function completeHandler(event) {
                _("status").innerHTML = event.target.responseText;
                _("progressBar").value = 0;
            }
            function errorHandler(event) {
                _("status").innerHTML = "Upload Failed";
            }
            function abortHandler(event) {
                _("status").innerHTML = "Upload Aborted";
            }
        </script>
    </head>
    <body>
        <h2>HTML5 File Upload Progress Bar Tutorial</h2>
        <form id="upload_form" enctype="multipart/form-data" method="post">
            <input type="file" name="file1" id="file1"><br>
            <input type="button" value="Upload File" onclick="uploadFile()">
            <progress id="progressBar" value="0" max="100" style="width: 300px;"></progress>
            <h3 id="status"></h3>
            <p id="loaded_n_total"></p>
        </form>
    </body>
</html>

php

<?php
$fileName = $_FILES["file1"]["name"]; // The file name
$fileTmpLoc = $_FILES["file1"]["tmp_name"]; // File in the PHP tmp folder
$fileType = $_FILES["file1"]["type"]; // The type of file it is
$fileSize = $_FILES["file1"]["error"]; // 0 for false... and 1 for true
if (!$fileTmpLoc) { // if file not chosen
    echo "ERROR: Please browse for a file before clicking the upload button.";
    exit();
}
if(move_uploaded_file($fileTmpLoc, "test_uploads/$fileName")) {
    echo "$fileName upload is complete";
} else {
    echo "move_uploaded_file function failed";
}
?>

Answer 1

将事件从“过程”更改为“进度”。

ajax.upload.addEventListener("progress", progressHandler, false);

进度条和总数到目前为止未显示

1 个答案: