2D JSON String Array Deserialized into JavaScript objects

Question

Hi I have a JSON string that looks like this:

{"2000":["1", "2", "3"],"2001":["1", "2", "3"],"2002":["1", "2", "3"]}

The string above comes from the "backend" and my JavaScript function receives the JSON string as a parameter, which is called backendData.

Looping through the parameter as below, gives the following result.

for (key in backendData) {
    alert(key);
}

Three alertboxes with the values: 2000, 2001 and 2002.

The problem is that I can't figure out how to access the string array for each of the "parent" elements. Using syntax key[0] etc. gives me the character at index 0 in the string which in all three cases are "2".

Help needed.

/Michael

Answer 1

This loops over all the values. Remember backendData is just a javascript object.

for (key in backendData) {
   for (x in backendData[key])
    alert(backendData[key][x]);
}

or in your example data this would work

for (key in backendData) {
   alert(backendData[key][0];
   alert(backendData[key][1];
   alert(backendData[key][2];
}

Answer 2

I think you want

backendData[key]

since you want to look up a mapping within the backendData map. key[0] indexes something inside of key (as a character array), which isn't what you're after as you discovered.