I am building a simple editor-type application in react-redux, and I want to mimic the operation of downloading and uploading json files for saving and loading data - entirely client side. The server side does not need the data. Local storage may be too small, and it would be nice to provide the user the data in a portable file they could upload on a new machine. Is this even possible, and if so how?
Using a blob file.
You can set the content of a new file which is temp and local, then trigger a click event to download the file.
duplicate answer here and here
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I'm currently thinking of a concept for a react-native app where people add events over a period of time like a diary/log. These events need to be exported and for security and privacy reasons I don't want to use a database. I've read you can use JSON files as a storage method, too.
How can I store data from the app to a JSON file and load the data from the JSON file back in the app? Don't need any code, helpful articles or webpages are appreciated
Assuming that you already have all the app data into a json, its rather simple.
Decide where to store the appdata.json, lets call it APP_DATA_PATH
Find a library to read/write files (I've only used expo-file-system)
On app boot, check if APP_DATA_PATH exists, if it does read the file and load into app, if not assume its a new user
Whenever app data changes, write the changes to APP_DATA_PATH
Automatic JSON Files upload to Blob Storage.
Description:
We have a SSIS job which will generate JSON files with data at a server path. We are manually copying the JSON files and dropping them in BLOB storage in order to trigger our logic app.
Now, Could anyone help to provide information on how we can automate the process of copying JSON files to BLOB automatically? ( Like do we have any approach or code to copy the JSON files at a specific time and copy those JSON files in BLOB )
The solution is to listen to the file system change at your server path, then to use Azure Storage SDK to upload these files which be triggered by the file changed event.
As reference, here are some resources about the API or SO threads of file changes listener in different languages, because I don't know what language you want to use.
C# FileSystemWatcher Class
Python How do I watch a file for changes?
Node.js Observe file changes with node.js
For other languages, I think you can easily get their solution by searching. And to upload files to Azure Storage, you just need to refer to Azure offical getstarted tutorials in dfferent languages to write your code.
I need to load a large number of pictures (around 30) in a sequence as a short movie, each .png has the size 960X540.
I don't want the loader depend on the name of each picture as I will make changes frequently.
Is there any suggestions?
Are you trying to load images from a local file system, or a remote web server?
If you want to load images from a local file system folder, you can use AIR's File/getDirectoryListing().
If you want to load images from a remote server, and you do not want to rely on a pre-defined file naming pattern, the server will need to be able to provide directory information, for example a PHP script that reads the directory contents and outputs XML or JSON. There's no general way for a client to probe a web server for files in a directory. Some web servers do have a default web directory listing script that shows when there is no "default" file in a folder (index.html, etc), but that probably won't be quite good enough for what you're trying to do.
As a final note, if you don't mind manually updating a file on the server that lists all the files as XML or JSON, you could create a simple AIR app to process a local file directory and generate the necessary XML or JSON and upload that to your server.
I'm looking into uploading an XML file and then storing it's contents in database. It looks like upload method of flash.net.FileReference would do the job however it just gives you an option to upload it to server.
I could upload it to server, read it from that server and then delete that file but I would like to avoid extra work.
Is there a way to just load a file into memory without saving it on some remote location?
No this cannot be done, uploads can only be done to a server, probably for security reason.
If you need to store the content to a database anyway, why don't you make the server-side bakend handle it?
If this is just some data that you need then throw away after the program is complete, perhaps you could consider asking the user to copy and paste their data to some textfield. That might depend on your target audience thought: IT-types - no problem, non-IT types-problem :D
If you are trying to have the user select an XML file from their local machine, after your myFileReference.load(), in your Event.COMPLETE handler function you can use var myXML:XML = XML(myFileReference.data); to get the data of the file you selected.
yes you can load all content in to cache, just push it into an array, when ever you want it just call it out.
I am facing problem in HTML 5. I need to statically load data into web page from local saved files. Up to now, I have been only able to load data via < input type="file" id="fileinput" / > but I want to load data from static location, which never changes. How to do that? And is there any way how to determine, whether some local file was changed from previous version?
Thanks
no, this isn't possible if by 'local', you mean a file at /home/waypoint/somefile.txt. You can make a 'link' with the filesystem api (if you selected it in an input field, for instance), which is valid to do computations with it (to read it, write to it, display it in img,etc). But it is deleted/unvalid, as soon as the window closes. If you could just magically "read" any local file via javascript which resides on the file system, who would stop google to read out your /etc/passwd file?
if your local computer is also your server and therefor your server-side code has access to the local file /home/waypoint/somefile.txt, your app can get it via ajax. Checking if the file exists, would be done the same way.