如何在浏览器中读取本地文本文件?

我试图通过创建一个函数来实现一个简单的文本文件阅读器，该函数接受文件的路径并将每行文本转换为字符数组，但它不起作用。

function readTextFile() {
  var rawFile = new XMLHttpRequest();
  rawFile.open("GET", "testing.txt", true);
  rawFile.onreadystatechange = function() {
    if (rawFile.readyState === 4) {
      var allText = rawFile.responseText;
      document.getElementById("textSection").innerHTML = allText;
    }
  }
  rawFile.send();
}

这里出了什么问题?

这似乎仍然不工作后，改变了代码一点点从以前的修订，现在它给我一个XMLHttpRequest异常101。

我已经在Firefox上测试过了，它可以工作，但在谷歌Chrome中，它不会工作，它一直给我一个101例外。我怎么能让它不仅在Firefox上工作，而且在其他浏览器(尤其是Chrome)上工作?

当前回答

尝试创建两个函数:

function getData(){       //this will read file and send information to other function
       var xmlhttp;

       if (window.XMLHttpRequest) {
           xmlhttp = new XMLHttpRequest();               
       }           
       else {               
           xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");               
       }

       xmlhttp.onreadystatechange = function () {               
           if (xmlhttp.readyState == 4) {                   
             var lines = xmlhttp.responseText;    //*here we get all lines from text file*

             intoArray(lines);     *//here we call function with parameter "lines*"                   
           }               
       }

       xmlhttp.open("GET", "motsim1.txt", true);
       xmlhttp.send();    
}

function intoArray (lines) {
   // splitting all text data into array "\n" is splitting data from each new line
   //and saving each new line as each element*

   var lineArr = lines.split('\n'); 

   //just to check if it works output lineArr[index] as below
   document.write(lineArr[2]);         
   document.write(lineArr[3]);
}

2013-10-16 23:29:49

其他回答

这可能会有帮助，

    var xmlhttp = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");

    xmlhttp.onreadystatechange = function () {
        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
            alert(xmlhttp.responseText);
        }
    }

    xmlhttp.open("GET", "sample.txt", true);
    xmlhttp.send();

2016-11-18 15:20:44

您需要检查状态0(当使用XMLHttpRequest在本地加载文件时，您不会返回状态，因为它不是来自web服务器)

function readTextFile(file)
{
    var rawFile = new XMLHttpRequest();
    rawFile.open("GET", file, false);
    rawFile.onreadystatechange = function ()
    {
        if(rawFile.readyState === 4)
        {
            if(rawFile.status === 200 || rawFile.status == 0)
            {
                var allText = rawFile.responseText;
                alert(allText);
            }
        }
    }
    rawFile.send(null);
}

在你的文件名中指定file://:

readTextFile("file:///C:/your/path/to/file.txt");

2013-01-21 20:20:34

尝试创建两个函数:

function getData(){       //this will read file and send information to other function
       var xmlhttp;

       if (window.XMLHttpRequest) {
           xmlhttp = new XMLHttpRequest();               
       }           
       else {               
           xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");               
       }

       xmlhttp.onreadystatechange = function () {               
           if (xmlhttp.readyState == 4) {                   
             var lines = xmlhttp.responseText;    //*here we get all lines from text file*

             intoArray(lines);     *//here we call function with parameter "lines*"                   
           }               
       }

       xmlhttp.open("GET", "motsim1.txt", true);
       xmlhttp.send();    
}

function intoArray (lines) {
   // splitting all text data into array "\n" is splitting data from each new line
   //and saving each new line as each element*

   var lineArr = lines.split('\n'); 

   //just to check if it works output lineArr[index] as below
   document.write(lineArr[2]);         
   document.write(lineArr[3]);
}

2013-10-16 23:29:49

在js(data.js) load中获取本地文件数据:

function loadMyFile(){
    console.log("ut:"+unixTimeSec());
    loadScript("data.js?"+unixTimeSec(), loadParse);
}
function loadParse(){
    var mA_=mSdata.split("\n");
    console.log(mA_.length);
}
function loadScript(url, callback){

    var script = document.createElement("script")
    script.type = "text/javascript";

    if (script.readyState){  //IE
        script.onreadystatechange = function(){
            if (script.readyState == "loaded" ||
                    script.readyState == "complete"){
                script.onreadystatechange = null;
                callback();
            }
        };
    } else {  //Others
        script.onload = function(){
            callback();
        };
    }

    script.src = url;
    document.getElementsByTagName("head")[0].appendChild(script);
}
function hereDoc(f) {
  return f.toString().
      replace(/^[^\/]+\/\*![^\r\n]*[\r\n]*/, "").
      replace(/[\r\n][^\r\n]*\*\/[^\/]+$/, "");
}
function unixTimeSec(){
    return Math.round( (new Date()).getTime()/1000);
}

data.js文件如下:

var mSdata = hereDoc(function() {/*!
17,399
1237,399
BLAHBLAH
BLAHBLAH
155,82
194,376
*/});

dynamic unixTime queryString阻止缓存。

AJ在网站http://.工作

2019-04-26 05:20:11

如果你想提示用户选择一个文件，那么读取它的内容:

// read the contents of a file input
const readInputFile = (inputElement, callback) => {
  const reader = new FileReader();
  reader.onload = () => {
    callback(reader.result)
  };
  reader.readAsText(inputElement.files[0]);
};
// create a file input and destroy it after reading it
const openFile = (callback) => {
  var el = document.createElement('input');
  el.setAttribute('type', 'file');
  el.style.display = 'none';
  document.body.appendChild(el);
  el.onchange = () => {readInputFile(el, (data) => {
    callback(data)
    document.body.removeChild(el);
  })}
  el.click();
}

用法:

// prompt the user to select a file and read it
openFile(data => {
    console.log(data)
  })

2020-12-16 15:13:31

如何在浏览器中读取本地文本文件?

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