<input type="file" id="file-id" name="file_name" onchange="theimage();">
This is my upload button.
<input type="text" name="file_path" id="file-path">
This is the text field where I have to show the full path of the file.
function theimage(){
var filename = document.getElementById('file-id').value;
document.getElementById('file-path').value = filename;
alert(filename);
}
This is the JavaScript which solve my problem. But in the alert value gives me
C:\fakepath\test.csv
and Mozilla gives me:
test.csv
But I want the local fully qualified file path. How to resolve this issue?
If this is due to browser security issue then what should be the alternate way to do this?
Some browsers have a security feature that prevents JavaScript from knowing your file's local full path. It makes sense - as a client, you don't want the server to know your local machine's filesystem. It would be nice if all browsers did this.
Use
document.getElementById("file-id").files[0].name;
instead of
document.getElementById('file-id').value
I use the object FileReader on the input onchange event for your input file type! This example uses the readAsDataURL function and for that reason you should have an tag. The FileReader object also has readAsBinaryString to get the binary data, which can later be used to create the same file on your server
Example:
var input = document.getElementById("inputFile");
var fReader = new FileReader();
fReader.readAsDataURL(input.files[0]);
fReader.onloadend = function(event){
var img = document.getElementById("yourImgTag");
img.src = event.target.result;
}
If you go to Internet Explorer, Tools, Internet Option, Security, Custom, find the "Include local directory path When uploading files to a server" (it is quite a ways down) and click on "Enable" . This will work
I am happy that browsers care to save us from intrusive scripts and the like. I am not happy with IE putting something into the browser that makes a simple style-fix look like a hack-attack!
I've used a < span > to represent the file-input so that I could apply appropriate styling to the < div > instead of the < input > (once again, because of IE). Now due to this IE want's to show the User a path with a value that's just guaranteed to put them on guard and in the very least apprehensive (if not totally scare them off?!)... MORE IE-CRAP!
Anyhow, thanks to to those who posted the explanation here: IE Browser Security: Appending "fakepath" to file path in input[type="file"], I've put together a minor fixer-upper...
The code below does two things - it fixes a lte IE8 bug where the onChange event doesn't fire until the upload field's onBlur and it updates an element with a cleaned filepath that won't scare the User.
// self-calling lambda to for jQuery shorthand "$" namespace
(function($){
// document onReady wrapper
$().ready(function(){
// check for the nefarious IE
if($.browser.msie) {
// capture the file input fields
var fileInput = $('input[type="file"]');
// add presentational <span> tags "underneath" all file input fields for styling
fileInput.after(
$(document.createElement('span')).addClass('file-underlay')
);
// bind onClick to get the file-path and update the style <div>
fileInput.click(function(){
// need to capture $(this) because setTimeout() is on the
// Window keyword 'this' changes context in it
var fileContext = $(this);
// capture the timer as well as set setTimeout()
// we use setTimeout() because IE pauses timers when a file dialog opens
// in this manner we give ourselves a "pseudo-onChange" handler
var ieBugTimeout = setTimeout(function(){
// set vars
var filePath = fileContext.val(),
fileUnderlay = fileContext.siblings('.file-underlay');
// check for IE's lovely security speil
if(filePath.match(/fakepath/)) {
// update the file-path text using case-insensitive regex
filePath = filePath.replace(/C:\\fakepath\\/i, '');
}
// update the text in the file-underlay <span>
fileUnderlay.text(filePath);
// clear the timer var
clearTimeout(ieBugTimeout);
}, 10);
});
}
});
})(jQuery);
On Chrome/Chromium based apps like electron you can just use the target.files:
(I'm using React JS on this example)
const onChange = (event) => {
const value = event.target.value;
// this will return C:\fakepath\somefile.ext
console.log(value);
const files = event.target.files;
//this will return an ARRAY of File object
console.log(files);
}
return (
<input type="file" onChange={onChange} />
)
The File object I'm talking above looks like this:
{
fullName: "C:\Users\myname\Downloads\somefile.ext"
lastModified: 1593086858659
lastModifiedDate: (the date)
name: "somefile.ext"
size: 10235546
type: ""
webkitRelativePath: ""
}
So then you can just get the fullName if you wanna get the path.
Note that this would only work on chrome/chromium browsers, so if you don't have to support other browsers (like if you're building an electron project) you can use this.
I came accross the same problem. In IE8 it could be worked-around by creating a hidden input after the file input control. The fill this with the value of it's previous sibling. In IE9 this has been fixed aswell.
My reason in wanting to get to know the full path was to create an javascript image preview before uploading. Now I have to upload the file to create a preview of the selected image.
If you really need to send the full path of the uploded file, then you'd probably have to use something like a signed java applet as there isn't any way to get this information if the browser doesn't send it.
Use file readers:
$(document).ready(function() {
$("#input-file").change(function() {
var length = this.files.length;
if (!length) {
return false;
}
useImage(this);
});
});
// Creating the function
function useImage(img) {
var file = img.files[0];
var imagefile = file.type;
var match = ["image/jpeg", "image/png", "image/jpg"];
if (!((imagefile == match[0]) || (imagefile == match[1]) || (imagefile == match[2]))) {
alert("Invalid File Extension");
} else {
var reader = new FileReader();
reader.onload = imageIsLoaded;
reader.readAsDataURL(img.files[0]);
}
function imageIsLoaded(e) {
$('div.withBckImage').css({ 'background-image': "url(" + e.target.result + ")" });
}
}
seems you can't find the full path in you localhost by js, but you can hide the fakepath to just show the file name. Use jQuery to get the file input's selected filename without the path
The best solution for this, I've found, is to use a middleware like Multer. Here's a quick rundown:
npm i multer
Add enctype="multipart/form-data" to your html form.
In your backend dock where you're making your post request, require multer (const multer = require('multer'))
In the same dock, set your upload destination: const upload = multer({dest:'uploas/'}). This will automatically create a local folder called 'uploads' where your files will be added. The code I've included shows you how to upload to your local disk storage. If you're using cloud storage (e.g. AWS, Azure, Cloudinary etc.) you can check out the Multer docs to see how to manage that. There aren't too many extra steps though.
in your post request, add 'upload.single' (for one file) or 'upload.array' (for multiple files), like this:
router.post('/new', upload.single('image'), async function(req, res) { //'image' should be the name of the input you're sending in the req.body
console.log(req.file) //note, if you're using 'upload.array', this should be 'req.files'
});
the req.file will have a full path name that you can use in your post request. For more information, check out the Multer docs:
https://www.npmjs.com/package/multer
I hope this helps!
You would be able to get at least temporary created copy of the file path on your machine. The only condition here is your input element should be within a form
What you have to do else is putting in the form an attribute enctype, e.g.:
<form id="formid" enctype="multipart/form-data" method="post" action="{{url('/add_a_note' )}}">...</form>
you can find the path string at the bottom.
It opens stream to file and then deletes it.
Hy there , in my case i am using asp.net development environment, so i was want to upload those data in asynchronus ajax request , in [webMethod] you can not catch the file uploader since it is not static element ,
so i had to make a turnover for such solution by fixing the path , than convert the wanted image into bytes to save it in DB .
Here is my javascript function ,
hope it helps you:
function FixPath(Path)
{
var HiddenPath = Path.toString();
alert(HiddenPath.indexOf("FakePath"));
if (HiddenPath.indexOf("FakePath") > 1)
{
var UnwantedLength = HiddenPath.indexOf("FakePath") + 7;
MainStringLength = HiddenPath.length - UnwantedLength;
var thisArray =[];
var i = 0;
var FinalString= "";
while (i < MainStringLength)
{
thisArray[i] = HiddenPath[UnwantedLength + i + 1];
i++;
}
var j = 0;
while (j < MainStringLength-1)
{
if (thisArray[j] != ",")
{
FinalString += thisArray[j];
}
j++;
}
FinalString = "~" + FinalString;
alert(FinalString);
return FinalString;
}
else
{
return HiddenPath;
}
}
here only for testing :
$(document).ready(function () {
FixPath("hakounaMatata:/7ekmaTa3mahaLaziz/FakePath/EnsaLmadiLiYghiz");
});
// this will give you : ~/EnsaLmadiLiYghiz
I want to stop file upload event when I upload the file more than 5mb or if my file extension is not .jpg or .png. I found a code but when I try to upload the invalid file type then it only gives me alerts that I have uploaded the wrong file but it does not cancel the event.
Here is the code:
<script>
function checkFile(fieldObj)
{
var FileName = fieldObj.value;
var FileExt = FileName.substr(FileName.lastIndexOf('.')+1);
var FileSize = fieldObj.files[0].size;
var FileSizeMB = (FileSize/5485760).toFixed(2);
if ( (FileExt != "png" && FileExt != "jpg") || FileSize>5485760)
{
var error = "File type : "+ FileExt+"\n\n";
error += "Size: " + FileSizeMB + " MB \n\n";
error += "Please make sure your file is in png or jpg format and less than 5 MB.\n\n";
alert(error);
return false;
}
return true;
}
</script>
and here is html code:
<input type="file"onchange="checkFile(this)"name='sec_2_img'>
You need to clear the value of 'sec_2_img'. You do this by adding fieldObj.value = ""; after alert(error) and before return false;. This will remove the file name from sec_2_img and force user to select a new one while still showing the message so user knows what to do.
1.) Don't use alerts, they are annoying and the browsers will block them pretty fast, so your users won't get any message anymore.
Use a modal window or add a styled element with the error-message somewhere into your form.
2.) If you need to have a valid file to submit this form, you have to add a event-handler to the submit-event of the form and stop the trasmission.
3.) your check for file-extension is case-sensitive, this might give you problems on windows, and your calculation of the fileSize is wrong.
When we click on choose file. It opens dialog window to choose a file to upload, but I want to know what really happens when we click on choose file and how does that diolog window appears.
Thanks in advance.
there should be some event which gets trigger when we click on choose
file. I need to know what that event is.
See GlobalEventHandlers.onchange , Using files from web applications , 4.10.5.1.18 File Upload state (type=file)
var input = document.querySelector("input[type=file]");
input.onchange = function(event) {
console.log(event.target.files)
}
<input type="file" />
HTML5 defines a files property for all controls. This collection is a FileList, which is an array-like structure called FileList containing File objects for each selected file in the control (remember, HTML5 allows multiple file selection in these controls). So at any point in time, you can get access to the files a user has selected using code similar to this:
<input type="file" id="your-files" multiple>
<script>
var control = document.getElementById("your-files");
control.addEventListener("change", function(event) {
// When the control has changed, there are new files
var i = 0,
files = control.files,
len = files.length;
for (; i < len; i++) {
console.log("Filename: " + files[i].name);
console.log("Type: " + files[i].type);
console.log("Size: " + files[i].size + " bytes");
}
}, false);
</script></code>
This relatively simple code listens for the change event on the file control. When the event fires, it signifies that the file selection has changed, and the code iterates through each File object and outputs its information. Keep in mind that the files property is always accessible from JavaScript, so you don’t have to wait for change to try to read it.
For more information please check the below URLs.
https://www.nczonline.net/blog/2012/05/08/working-with-files-in-javascript-part-1/
https://en.wikipedia.org/wiki/File_select
Could you tell me (for example, Google could not), if I can set the default file format for file upload.
Currently it allows to upload all files (please refer to the file image *.*), however I would like to limit to a specific file format.
All help is appreciated.
Environment:
NO HTML5
Backend: Struts
FrontEnd: jQuery-1.6.1
File upload plugin uses iframe to upload files.
you can use this
<input type="file" id="myfile" accept="image/gif, image/jpeg, image/png, image/jpeg" />
but using this. user can anytime change the filter.
additionally you should use
javascript or jquery to validate.
<script type ="text/javascript">
var validFiles=["bmp","gif","png","jpg","jpeg"];//array of allowed extensions
function OnUpload()
{
var obj = document.getElementById("myfile");
var source=obj.value;
var ext=source.substring(source.lastIndexOf(".")+1,source.length).toLowerCase();
for (var i=0; i<validFiles.length; i++)
{
if (validFiles[i]==ext)
break;
}
if (i>=validFiles.length)
{
alert("This not a valid file upload file with an extention of one of the following:\n\n"+validFiles.join(", "));
return false;
}
return true;
}
</script>
I give user the option of uploading a file like this
<form action="#" onsubmit="return Checkfiles(this);">
<center><input type="file" id="filename">
<input type="submit" value="Go!"></center>
</form>
When user uploads the file, I validate the file using the following javascript function
<script type="text/javascript">
function Checkfiles()
{
var fup = document.getElementById('filename');
var fileName = fup.value;
var ext = fileName.substring(fileName.lastIndexOf('.') + 1);
if(ext == "pdf" )
{
return true;
}
else
{
alert("Upload pdf files only");
fup.focus();
return false;
}
}
</script>
Evertything is working fine with it.
But I want to validate file by some other means and not just by its extension
I will give reason for doing this. I renamed an image file to image.pdf and now its in pdf format but couldnt be opened.
So I want to validate a pdf file in exact way. Is there any other way to check other than by its extension?
Edit
I want to do validation at server end using jsp page. So what should I do for that?
Thanks in ADVANCE :)
To validate a filetype on javascript, here are some ways:
// Your way: getting the extension and checking it.
// I suggest this way instead of using indexOf:
var ext = fileName.split('.').reverse()[0]
// Splits by '.', reverse the array, and returns the first element
// Another way: checking the type of the file
if ( fup.files[0].type === 'application/pdf' ) {
console.log( 'It is validated!' )
}
Live example: http://jsbin.com/akati3/2 thanks to https://stackoverflow.com/a/4581316/851498
But then, you should really validate this on the server side as others said.
Any kind of javascript validation is only for users comfort. Everything should be validated on serverside too. User can easily disable or modify any javascript code.
Anyway. you can't check file contents in javascript.
In PHP, you can use http://www.php.net/manual/en/function.finfo-file.php to detect file type by it's contents. Most of other languages should have similar functionality.
As far as I know, checking if a pdf actually is a pdf can only be done on server side. You could try and open it with IText or something similar; I bet it throws some sort of exception when you try opening or modifying something else then a PDF.