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Editorial Team
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Asked: 2026-05-30T09:07:29+00:00

Do any one have a sample code of how to read and write from/into

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Do any one have a sample code of how to read and write from/into text file using javascript

What i tried is like created a iframe and load text file into it from iframe i read the content and using string operation make some changes, and i have no idea how to write back to text file.
and also on ie browser this code is not working.

My text.txt file contain
First line
second Line
Third Line
Fourth Line

<html>

<head>
  <title></title>
</head>

<body>
<script language="JavaScript" type="text/javascript">
<!--


var srcFrame;

function loadOuter(doc) {
 srcFrame = document.getElementById("hiddenContent");
 srcFrame.src = doc;



 transferHTML();

}

function transferHTML(){
 srcContent='';
 if (srcFrame.contentDocument){
 alert("document");
  srcContent=srcFrame.contentDocument.getElementsByTagName("BODY")[0].innerHTML;
 }
 else if (srcFrame.contentWindow){
  alert("window");
  srcContent=srcFrame.contentWindow.document.body.innerHTML;
 }

srcContent.length;
alert(" before push "+srcContent);
var arrayText="Last Line";
var lines = srcContent.split('\n');
lines=lines.slice(0, -1);
lines.push(arrayText,"</pre>");
lines = lines.join('\n');
srcContent=lines;
alert(srcContent);
document.getElementById("outerDisplay").innerHTML = srcContent;
}

</script>

<INPUT TYPE="button" VALUE="Test.txt" onClick="loadOuter('Test.txt')" >

<div id="outerDisplay"></div>

<iframe  id="hiddenContent" width="200" height="200" style="position:absolute;visibility:hidden;" ></iframe>

</body>

</html>
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1 Answer

  1. Editorial Team

    In IE this is possible using ActiveXObject and HTA. These, however, are recommended to use local only, not in the WEB. Look at: http://msdn.microsoft.com/en-us/library/ms536471%28v=vs.85%29.aspx

    More info for file operations: http://msdn.microsoft.com/en-us/library/bstcxhf7%28v=vs.84%29.aspx

    Basic functions below:

    ActiveXObject definition:

    fso=new ActiveXObject('Scripting.FileSystemObject');

    Reading file:

    iStream=fso.OpenTextFile('filePath',1,false);
iStream.ReadAll();
/* or looped iStream.ReadLine() */
iStream.Close();

    Writing file:

    oStream=fso.OpenTextFile('filePath',2,true);
oStream.WriteLine(/*your_data*/);// This usually is looped according to your data
oStream.Close();

    fso-object can also be used in regular HTM-page, but you’re asked to accept use of the ActiveXObject very often.

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