Question

I’m looking for a way to read from an external text file map.txt (allocated in my own server, not in the client’s computer) and to store the data contained in it in a bi-dimensional array map[][] using Javascript.

The map.txt file would be filled with numbers and each of it’s rows has a fixed length:

21123301201200
12030201303321
22321321021312
12312310001230
12312321221220

So, I want it to store it in the bi-dimensional array map in such a way that map[0][0] = 2 and map[13][4] = 0 -in this example-. Is this even possible to do? And if so, how is it done?

Thanks!

Answer 1

You could use XMLHttpRequest to get the file. Have a look at: http://www.quirksmode.org/js/xmlhttp.html

And use this function to create the array:

function handleRequest(req){
    var a=req.responseText.split('\n');
    var len=a.length;
    for(var i=0;i<len;i++){
        a[i]=a[i].split('');
    }
    return a;
}

This function should return:

[["2","1","1","2","3","3","0","1","2","0","1","2","0","0"],
["1","2","0","3","0","2","0","1","3","0","3","3","2","1"],
["2","2","3","2","1","3","2","1","0","2","1","3","1","2"],
["1","2","3","1","2","3","1","0","0","0","1","2","3","0"],
["1","2","3","1","2","3","2","1","2","2","1","2","2","0"]]

Use map[4][13] instead of map[13][4] to get the last element in your example