Best practices for reading text files with HTML

Text files can be read through HTML using the <input type="file"> element and utilizing the FileReader API. Best practices include using the accept attribute to filter file types, leveraging the multiple attribute to select multiple files, and reading files through the onchange event handler. A practical case demonstrates how to read a text file and display its content, using the readAsText() method of FileReader to load the file content into a variable.

Reading text files with HTML: Best practices & practical cases

Reading text files with HTML can be done through<input type="file"> element implementation, which allows the user to select a file to read.

<input type="file" id="file-input">

Best Practice:

• Use the accept attribute to filter file types: For example, accept=".txt,.csv"
• Use the multiple attribute to select multiple files: multiple
• Handling files: Use the onchange event handler to obtain and read files.
• Use FileReader API: FileReader API provides methods to read file content, such as readAsText()
• Consider security: Read only known and trusted files that users upload to your server.

Practical case:

Read a text file and display its content:

<input type="file" id="file-input">

<script>
  const input = document.getElementById('file-input');

  input.addEventListener('change', function() {
    const file = input.files[0]; // 获取第一个文件
    const reader = new FileReader();

    reader.onload = function() {
      const text = reader.result; // 已读取的文件内容
      // 在此使用 `text` 变量
    };

    reader.readAsText(file);
  });
</script>

The above code allows the user to select a text file and Loads its contents into a text variable, which can be used for further processing (for example, display, parsing, or storage).

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