Read A Server Side File Using JavaScript

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情书的邮戳
情书的邮戳 2021-02-04 03:11

I have on my web server a JS script that I want to be able to read files. My filesystem is like this:

> Root
index.html
read.js
> files
    file.txt
         


        
5条回答
  •  醉梦人生
    2021-02-04 03:55

    Here's a sample web page for you:

    http://sealevel.info/test_file_read.html

    Here's the javascript code:

    // Synchronously read a text file from the web server with Ajax
    //
    // The filePath is relative to the web page folder.
    // Example:   myStuff = loadFile("Chuuk_data.txt");
    //
    // You can also pass a full URL, like http://sealevel.info/Chuuk1_data.json, but there
    // might be Access-Control-Allow-Origin issues. I found it works okay in Firefox, Edge,
    // or Opera, and works in IE 11 if the server is configured properly, but in Chrome it only
    // works if the domains exactly match (and note that "xyz.com" & "www.xyz.com" don't match).
    // Otherwise Chrome reports an error:
    //
    //   No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://sealevel.info' is therefore not allowed access.
    //
    // That happens even when "Access-Control-Allow-Origin *" is configured in .htaccess,
    // and even though I verified the headers returned (you can use a header-checker site like
    // http://www.webconfs.com/http-header-check.php to check it). I think it's a Chrome bug.
    function loadFile(filePath) {
      var result = null;
      var xmlhttp = new XMLHttpRequest();
      xmlhttp.open("GET", filePath, false);
      xmlhttp.send();
      if (xmlhttp.status==200) {
        result = xmlhttp.responseText;
      }
      return result;
    }
    

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