input type file with file path - javascript

I want to import data from a path in an input type file.
It is in use in the kendo UI, and when I wrote the article, I uploaded the data to the spreadsheet by using the file upload window and saved the data to the server.
Therefore, the file is stored in the server-specified path, and DB contains basic information such as file path, file name, and extension.
When I read a post using this, it was successful to retrieve the information of the file from the DB, but it is not in the reading part of the file.
So, I do not upload the file from the input type file that I used at the time of writing, but I want to read the file information from fromfile.
If you know how to do it, please let me know.
This is the code I used to write.
<input class="icon_input_file" type="file" id="insertFile" name="insertFile"/>
$("#insertFile").on("change", function(){
var spreadsheet = $("#spreadsheet").data("kendoSpreadsheet");
spreadsheet.fromFile(this.files[0]);
});

Related

Android webview - how to fetch a file from external storage

I have a mobile app that wraps around the web-app, using webview.
The web-app has a button to open a large .zip file (e.g. 100 MB).
The user clicks a button, and selects a .zip file.
This triggers an onChange function with a variable of type File (Blob), which includes attributes like:
file name
file size
file type (application/zip)
The javascript code then parses the .zip file, extracts specific data within it and uses it within the web-app.
This works well within the web-app, when the app is called via the Chrome browser.
For example when operated in chrome browser on an Android phone, I can pull the .zip file and open it in the web-app.
I want to do the same but using the mobile app.
I am able to pick up the .zip file using a File Chooser, and pass it to Webview but I have problems to fetch the file from the Javascript code.
For reference, I am able to pass an image, by creating a data_uri using stringBuilder and passing the content (as data:image/jpeg;base64).
But the zip file is much larger.
When calling fetch(fileUri) from the Javascript side I'm getting errors.
I'm using the following uri
/storage/emulated/0/Android/data/com.example/files/Download/file2.zip
The fetch succeeds but returns a blob with size of 165 (i.e. not the actual size of the file) which hosts the error message:
{
"error": "Not Found",
"message": "The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again."
}
The program flow is like so:
I select a .zip file via FileChooser.
In onActivityResult, the uri value is /document/msf:12858 (seen via uri = intent.getData();)
The uri needs to be mapped into a real path file url, such that the fileUrl will be passed to webview.
Webview will then fetch the file using the fileUrl.
I searched how to get the real path file url when selecting a file with FileChooser, and found
this, and this links.
I wasn't able to get the real file path, so I decided to read the file and write it to another location, so I can get a file path. (this is not efficient and done just to check the functionality).
I create the new file using the following code:
InputStream stream = context.getContentResolver().openInputStream(uri);
File file2 = new File(context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS), "file2.zip");
writeBytesToFile(stream, file2);
I don't see any errors when creating the file, and when creating the file, the number of bytes that are read and written to the new file are as expected.
For file2, I get a value of:
/storage/emulated/0/Android/data/com.example/files/Download/file2.zip
Then, within the Javascript code I fetch this file path.
But I'm getting a Blob with the "file-not-found" content as above.
So:
How can I verify that the file is indeed created and that the path can be fetched from webview?
How can I get the real file path of the original selected file, so I don't have to read and write the original file to new location just to get the file path?
Thanks
I was able to get the file from external storage by doing the following steps:
create an initial uri (uri1)
The uri is created by:
creating a temporary file (file1) in the storage dir via
context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)
I'm not sure why a temporary file need to be created but if I don't create a file I cannot get the uri.
createFile3
get the uri via
Uri uri1 = FileProvider.getUriForFile(context, "com.example.android.fileprovider", file1);
create an intent with the following attributes:
Intent.ACTION_OPEN_DOCUMENT
category: Intent.CATEGORY_OPENABLE
type: "application/zip"
extra attribute: fileIntent.putExtra(DocumentsContract.EXTRA_INITIAL_URI, uri1);
this opens a dialog box for selecting openable zip files in the Downloads directory,
after the file is selected, a new uri (uri2) is created that includes the name of the selected file.
extract the name of the file via
String fileName = getFileName(context, uri2);
create the dirPath by appending the filename
dirPath = "/data/user/0/com.example/" + fileName;
if the dirPath does not exist (first time), write the file to its dirPath location.
on successive ocassions dirPath exists, so there is no need to re-write the file.
open the file with regular Java means, e.g. via
ZipFile zip = new ZipFile(dirPath);

Get server URL from file input in Javascript

I need to manage some files who are uploaded to my server, but I need to get the URL of the selected file. I know you can't do this with javascript with files outside the server, but I wanna know if there's a way to get the URL from files in the server. For example I got this image from my file input with a selected file (LTAIPBCS75FI.xls) who is hosted in "xls/ITAI2016/Fraccion01/" in my home directory. I get this URL from php:
URL IN FILE INPUT
I need then to get the full directory when I select a file in my server.

post a file using javascript

I need to read a local file and post it to the server, we do not need to choose the file. The path of the file is given.
uploading a file when user manually selects works but in the above scenario we need to read an existing file and post it.
I generally just require the file and upload it.
var file = require('path');

Questions about extract.autodesk.io - taking a file path instead of choosing with the file chooser

I'm trying to modify the project so I could plug in a file path or a file as a variable instead of the user choosing the model file. So I'm looking for where the actual upload happens.
In submitProject():
https://github.com/cyrillef/extract.autodesk.io/blob/master/www/js/app.js#L129
I see that it just sends (with an ajax request) an object that holds the file name and unique identifier but not the actual binary file.
In here:
https://github.com/cyrillef/extract.autodesk.io/blob/master/www/js/upload-flow.js#L34
there's r.upload(), is this the actual upload of the model?
Does it start to upload the file right as you press ok in the file chooser?
Is there a way to give it a file path to upload instead of uploading with the form and file chooser?
The author of this sample should be on Christmas vacation, I just downloaded and setup the extractor sample on my machine, with a little debug into the code, let me try to answer as much as I can.
In general, I think some of your understanding is correct, but let me explain a little more:
For a local file to be uploaded and translated, there are actually 2 steps of actual “upload”.
As you mentioned, when you press ok in the file chooser, yes, the file will be first uploaded to the "extractor" server as you noticed by some methods like r.upload(), it’s actually using a JavaScript library call “flow.js", which provides multiple simultaneous, stable, fault-tolerant and resumable/restartable file uploads via the HTML5 File API. I am not expert on this, but you can check that module about how to use it to upload a file.
By now, your file is uploaded from client to the "extractor" server, but if you want to translate the file to "svf", the file is required to be uploaded to Autodesk Server(OSS), that is done by clicking “submit my project” buton, when you click this button, as you mentioned, from client, it will call the method submitProject() in https://github.com/cyrillef/extract.autodesk.io/blob/master/www/js/app.js, this method will send a post request of “/api/projects” to the "extractor" server, if you check the code at server side https://github.com/cyrillef/extract.autodesk.io/blob/master/server/projects.js , you can see the extractor server actually upload the file to Autodesk OSS, and then triggers the translation service.
This feature (passing a URL string vs a file binary) is already implemented. You can use the uri: edit box and paste your file URL there. It supports http(s) or S3 uri with access token.
The physical upload happens in this file, whereas the SubmitProject() code sends only information as JSON. The JSON object only contains a reference to the file which was uploaded using flow.js. But would contain the uri string if you had choose that method.

Get file content from file input field

So, I have an input field, I have the file list object containing the files, but I can't see how to get at the file content. What I want to do is use crypto-js to generate an md5 hash of the file.
I want to use the hash as a reference to the file (i.e. asrjq38w94r5yh8hrqw9.jpg) and also so I can veryfy file integrity to insure the file got uploaded correctly.
Is the only way to do this by getting the file path from the file input field and then using the FileReader object to get the file content?

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