I have a JSON file, and I have some audio file in each entry.
{
{
audio: '~/audios/1.mp3'
info: 'some other info'
},
{
audio: '~/audios/2.mp3'
info: 'some other info'
},
{
audio: '~/audios/3.mp3'
info: 'some other info'
}
}
Now I would like to put all of this stuff in my MongoDB database (instead of using this JSON). In the very end my app will be using some service to store the mp3 files on some super-efficient server I guess, so I would need to save their proper links in my MongoDB. So I guess I will have links like https://cdnjs.cloudflare.com/bla/data/audio1.mp3 (for example) - But how do I generate these links and pop them into my MongoDB database?
I'm not sure if I understand your question. Just upload your audio to your CDN. It should generate the links for you. You can save these to MongoDB by interfacing directly with the Mongo shell or using the Mongoose ORM. If users are going to be uploading music to your app directly, you will probably be using some external API to upload files. For example, if you wanted to upload Images to the Imgur API, you would send data to their API endpoints for image uploads and their API would automatically return a link to your image. You would need to write a callback function that checks whether the image upload went correctly - if all went well and you don't need to throw an error, you would have a method written in your callback to create a new document in MongoDB/Mongoose to save that link, following a schema that makes it logically possible to retrieve the location/uploader (also saving a reference to the user who uploaded it, for example)
You would also probably be using HTML's to handle this, if it's a web app
Alternatively, you can set up your own methods on your back-end server for storing and retrieving file uploads, hosting on Amazon will give you a lot of bandwidth to work with.
Related
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
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
I'm new to Scala and Scala.js and I want to experiment with handling JSON data. I'd like to simulate a server response by returning the content of a JSON file local to my Scala.js project, parse it and work with the data. What would be the best way to do so? Where should I place these files in my project tree, and how would I get their content?
Say that I have a file called myJSON.json containing something like
[
{
"ress": "AR",
"lastDate": "2017-10-27 09:19:18"
},
{
"ress": "JIM",
"lastDate": "2017-10-27 06:57:15"
},
{
"ress": "JOE",
"lastDate": "2017-09-29 11:57:39"
}
]
Can I place this file somewhere in my project so that I can read this file and then parse its content to use it somehow (could be displayed in the browser, logged to the console, etc...)? I guess I could use a tool such as scala-js or something similar for parsing, but accessing the file content in the first place is what I try to figure out.
Note that I'm using scala-js.
Thanks in advance!
Like others said above, Javascript that runs in the browser in general can't access the local filesystem. There are some exceptions:
The File API lets you access files that the user has selected in the UI using <input type="file" /> or drag-and-dropped into the browser window.
The Filesystem API lets you access files the way you seem to want, but it is non-standard and is not supported in most browsers. It also seems that Scala.js has no typings for it, but I'm not sure.
scala-js-dom has typings for the File API that you can use – search for File and FileList types in its source. Its API mirrors the Javascript API, so you will need to look for how exactly to do this in JS. Then translating it into Scala.js will be easy (or at least a different question).
If the File API does not work for your use case, another option is to use something like json-server to easily serve your JSON files on localhost via HTTP.
We run the offline viewer using the http-server command, how can we make it load more files other than the bubbles and to be able to send strings back to it to save as files on the file system?
Do we have to write a modified http-server for that? if so can we have some direction on how?
The Viewer is read-only, nothing is saved or changed on the model after the translation.
It's possible to get the current state, like zoom, perspective or position via Autodesk.Viewing.Viewer3D methods: getState() and restoreState(), but the state is not actually saved by default, you'll need to implement a JavaScript that communicate with your backend to POST and GET this information. This sample extends this state.
Another sample extend this to save changes on model back to server that comunicate to the original file. Again, everything is custom implemented.
In any case you'll need a back-end that store the changes and a JavaScript that read and restore it.
Recently I've found that I can use pure HTML, CSS and JS to build Android app (and iOS also maybe), by using PhoneGap. I guess it converts HTML pages to Android web views. So basically I'll have ~10 HTML files, calling each other, get data from Server (it's Java and Tomcat) via Ajax and JSONP.
And my problem is about storing user data with these static local HTML files.
As they are local files, I can't use Cookie. But somehow Session's still working, so with each HTML page, I can set an onload event that sends an Ajax request, then get data. But it's very inconvenient, I have to do that for the same data each time I switch to another HTML file. So, is there any solution I can load all data when the first HTML file is loaded, store data somewhere, then reuse these data in others HTML files ? Thank you so much for reading my question.