My Javascript code that is run in client-side needs to read a binary file that is stored in the server. How can I do it for all browsers?
I have found solutions with ActiveXObject - FileSystemObject that are only working in Internet Explorer.
Thanks
-
1Are you sure the javascript is server-side? If it is, then why do you care about the browser? Client-side javascipt runs on the browser. Not server-side.Eric– Eric2012-05-23 11:15:59 +00:00Commented May 23, 2012 at 11:15
-
What do you need to parse out of the binary file?Eric– Eric2012-05-23 11:17:16 +00:00Commented May 23, 2012 at 11:17
-
1server side javascript.. you mean classic .asp with javascript (pages started with @Language="JavaScript" or server language default to javascript)?neu-rah– neu-rah2012-05-23 11:20:29 +00:00Commented May 23, 2012 at 11:20
-
1If it is server side, then the browser is irrelevant.Quentin– Quentin2012-05-23 11:28:04 +00:00Commented May 23, 2012 at 11:28
-
Apologies. This was not server-side but client-side. I was confused but what I wanted to say is that the file to be read is in the server, not local.user411103– user4111032012-05-23 11:35:57 +00:00Commented May 23, 2012 at 11:35
|
Show 1 more comment
2 Answers
function getXHR(){
var xhr;
try{
xhr = new XMLHttpRequest();
}catch(e){
try{
xhr = new ActiveXObject("MSXML2.XMLHTTP.6.0");
}catch(e2){
try{
xhr = new ActiveXObject("MSXML2.XMLHTTP");
}catch(e3){}
}
}
return xhr;
}
function getBinaryData(url, callback){
var xhr = getXHR();
xhr.open("GET", url, !!callback);
if(callback){
xhr.onload = function(){callback(xhr, true)};
xhr.onerror = function(){callback(xhr, false)};
}
xhr.send();
return callback ? undefined : xhr.responseText;
}
You would then use getBinaryData to get the file. with asynchronous, it will call the callback with arguments the xhr object itself (you would read the responseText property), and whether it was successful. Synchronously, it returns the binary data.
2 Comments
pbfy0
Yes, the ActiveXObject is only used in IE. It first tries just doing
new XMLHttpRequest(), which is the W3C standardfor classic asp server side javascript (from an old document server i have)
as it is server side all browser will download the file, in this case this piece of code was not to give direct access to file and was used after user login check.
Server.ScriptTimeout=500;//this might take some time
var docs_type="application/pdf";
var filename="...";//put your filename here (relative path)
var objStream = Server.CreateObject("ADODB.Stream");
try {
objStream.Open();
objStream.Type=1;//binary
objStream.LoadFromFile(Server.MapPath(filename));
Response.AddHeader("Content-Length", objStream.Size);
Response.ContentType=docs_type;//the type of document you are serving
Response.AddHeader("Content-Disposition", "attachment; filename=your_filename.pdf");
while(!objStream.EOS&&Response.IsClientConnected) {
Response.BinaryWrite(objStream.Read(4*1024*256));
Response.Flush();
}
objStream.Close();
Response.End();
} catch(e) {
Response.Write("Error serving document<br>");
Response.End();
}
}
