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Posted By

Twain on 10/28/07


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web


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robotoverlord
vali29


Read local file with XmlHttpRequest

Published in: JavaScript 

For a locally saved web app, this is a cross-browser way to read files (writing not implemented).

Plain TextExpand 
  1. /* Read a file  using xmlhttprequest 
  2.  
  3. If the HTML file with your javascript app has been saved to disk, 
  4. this is an easy way to read in a data file.  Writing out is 
  5. more complicated and requires either an ActiveX object (IE) 
  6. or XPCOM (Mozilla).
  7.  
  8. fname - relative path to the file
  9. callback - function to call with file text
  10. */
  11. function readFileHttp(fname, callback) {
  12.    xmlhttp = getXmlHttp();
  13.    xmlhttp.onreadystatechange = function() {
  14.       callback(xmlhttp.responseText);
  15.    }
  16.    xmlhttp.open("GET", fname, true);
  17.    xmlhttp.send(null);
  18. }
  19.  
  20. /*
  21. Return a cross-browser xmlhttp request object
  22. */
  23. function getXmlHttp() {
  24.    if (window.XMLHttpRequest) {
  25.       xmlhttp=new XMLHttpRequest();
  26.    } else if (window.ActiveXObject) {
  27.       xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  28.    }
  29.    if (xmlhttp == null) {
  30.       alert("Your browser does not support XMLHTTP.");
  31.    }
  32.    return xmlhttp;
  33. }

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