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要實(shí)現(xiàn)文件上傳進(jìn)度提示,我們可以使用PHP、HTML、JavaScript和后端腳本(如Apache或Nginx服務(wù)器)來完成。以下是實(shí)現(xiàn)文件上傳進(jìn)度提示的步驟:
在HTML文件中創(chuàng)建一個(gè)表單,用于上傳文件。同時(shí),添加一個(gè)用于顯示上傳進(jìn)度的<progress>
元素和一個(gè)用于觸發(fā)文件上傳的<input type="file">
元素。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>File Upload with Progress</title>
</head>
<body>
<form action="upload.php" method="post" enctype="multipart/form-data">
<input type="file" name="fileToUpload" id="fileToUpload">
<br><br>
<progress id="uploadProgress" value="0" max="100"></progress>
<br><br>
<input type="submit" value="Upload File" name="submit">
</form>
<script src="upload.js"></script>
</body>
</html>
創(chuàng)建一個(gè)名為upload.php
的PHP文件,用于處理文件上傳。在這個(gè)文件中,我們將使用$_FILES
全局變量來獲取上傳的文件信息,并使用move_uploaded_file()
函數(shù)將文件移動到指定的目錄。
<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));
// Check if file already exists
if (file_exists($target_file)) {
echo "Sorry, file already exists.";
$uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
echo "The file " . htmlspecialchars(basename($_FILES["fileToUpload"]["name"])) . " has been uploaded.";
} else {
echo "Sorry, there was an error uploading your file.";
}
}
?>
創(chuàng)建一個(gè)名為upload.js
的JavaScript文件,用于處理文件上傳和進(jìn)度提示。在這個(gè)文件中,我們將使用XMLHttpRequest
對象來發(fā)送文件到服務(wù)器,并監(jiān)聽上傳進(jìn)度事件。
document.getElementById("uploadForm").addEventListener("submit", function(event) {
event.preventDefault();
var formData = new FormData(this);
var xhr = new XMLHttpRequest();
xhr.open("POST", "upload.php", true);
// Monitor upload progress
xhr.upload.addEventListener("progress", function(event) {
if (event.lengthComputable) {
var progress = Math.round((event.loaded / event.total) * 100);
document.getElementById("uploadProgress").setAttribute("value", progress);
}
});
// Handle upload completion
xhr.addEventListener("load", function() {
if (xhr.status === 200) {
console.log(xhr.responseText);
} else {
console.error("Upload failed with status " + xhr.status);
}
});
// Send the request
xhr.send(formData);
});
現(xiàn)在,當(dāng)用戶選擇一個(gè)文件并點(diǎn)擊上傳按鈕時(shí),文件上傳進(jìn)度提示將顯示在<progress>
元素中。請注意,這個(gè)示例僅用于演示目的,實(shí)際應(yīng)用中可能需要根據(jù)需求進(jìn)行調(diào)整。
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