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html delete file
- WBOYOriginal
- 2023-05-15 17:55:38960browse
Speaking of HTML deleting files, we need to first understand what HTML is.
HTML, or Hypertext Markup Language, is a standard markup language used to create web pages and other web applications. It is used to describe the structure and content of a document, contains various text and images, and can link to other web pages or resources.
When we upload files on the web page, we also need a function to delete the file so that the file can be deleted if it is not needed or uploaded incorrectly. Next, we'll discuss ways to implement file deletion in HTML.
First of all, what we need to understand is that HTML itself does not have a built-in function to delete files. But we can use some other technologies and languages to achieve it, such as server-side scripting languages such as JavaScript and PHP.
In JavaScript, we can use the 3525558f8f338d4ea90ebf22e5cde2bc element to upload files, and use the bb9345e55eb71822850ff156dfde57c8 element to add and delete files. Button:
<!DOCTYPE html>
<html>
<head>
<title>文件上传与删除</title>
</head>
<body>
<input type="file" id="fileInput">
<button onclick="deleteFile()">删除文件</button>
<script>
function deleteFile() {
var file = document.getElementById('fileInput').value;
if (file != "") {
document.getElementById('fileInput').value = "";
alert("文件已删除");
} else {
alert("没有选中文件");
}
}
</script>
</body>
</html>The above code defines an 3525558f8f338d4ea90ebf22e5cde2bc element, and the deleteFile() function is triggered by clicking the button to delete the selection. document. This function takes the file name selected in the d5fd7aea971a85678ba271703566ebfd element and removes it by modifying its value value.
When we upload a file, the uploaded content needs to be stored on the server, such as using PHP to store the file. Therefore, we can use PHP’s unlink() function to delete files on the server. The following is a PHP sample code to delete a file on the server:
<?php
$file = "filename.txt"; // 需要删除的文件名称
if (!unlink($file)) {
echo ("文件未删除");
} else {
echo ("文件已删除");
}
?>This code uses the unlink() function to delete the specified file. If the file is deleted successfully, the function will return true, otherwise it will return false.
In general, implementing the file deletion function in HTML code requires the cooperation of other technologies and languages. Files on the front end can be deleted through JavaScript, and files on the backend server can be deleted through PHP. In this way, we can easily implement the function of deleting files.
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