saving datas with HTML5 export

jimlev

Hello, I'm back with a question that I'm afraid to already know the answer...
Is there a tricky way to save small data (a highscore for example) locally with an html5 app? or do I need to connect my appp to a DB and blabla bla...
thanks !

hgy29

Yes you can, except if the user is browsing in private mode or similar scenario. |D| folder in gideros apps is backed with a browser side DB (indexdb)

jimlev

Nice ! Not sure that I understood every details but, now, as I know it's possible, I'm gonna make some tests and tries.

MoKaLux

there is this piece of code:

require "json"   function saveData(filepath, value) local contents = json.encode(value) local file = io.open("|D|"..filepath, "w") -- create file file:write(contents) -- save json string in file io.close(file) end   function getData(filepath) local value local file = io.open("|D|"..filepath, "r") if file then local contents = file:read("*a") -- read contents value = json.decode(contents) -- decode json io.close(file) end   return value end

And then at the start of your app:

g_myprefs = "|D|yourfilename.txt"

-- init prefs local mydata = getData(g_myprefs) -- try to read information from file -- if no prefs file, create it if not mydata then mydata = {} mydata.g_language = g_language mydata.g_iswarnings = g_iswarnings ... saveData(g_myprefs, mydata) -- create file and save datas else g_language = mydata.g_language g_iswarnings = mydata.g_iswarnings ... if g_iswarnings == nil then g_iswarnings = true end if g_isextrawarnings == nil then g_isextrawarnings = true end end

To save your data anywhere in your code you can do:

-- save prefs function mySavePrefs() mydata = {} mydata.g_language = g_language mydata.g_iswarnings = g_iswarnings ... saveData(g_myprefs, mydata) -- save new datas end

jimlev

thanks a lot ! I was on the road to that result using an old piece of code of my own.
I also found an example on the forum on that page: http://forum.giderosmobile.com/discussion/6105/html5-showcase-alpha-discussion/p3

I have a question. My own example is quite close to your snippet. But it doesn't use JSON formating. In my old project, I was using a ".txt" file to save the content of a table (the code I found is from a 6y old project). Do you use JSON for convenience or it is a necessity today with Gideros local saving system ?

MoKaLux

I don't use json, but I think you must include the plugin when you export your app/game otherwise that won't work. You need json for this line of code:

local contents = json.encode(value)

I save the data as plain text but you can change the extension to anything (eg: yourfilename.dat)