I need help with making a 3-dimensional array, my objective is e.g:
Just for graphic illustration :-), see row below
[category: 1[subcategories: 1[subsubcategories: 1,2],2[subsubcategories: 3,4]]
In scenario above the user has selected:
category 1
subcategories: 1
subsubcategories: 1,2
subcategories: 2
subsubcategories: 3,4
I can then with these values create a string like: 1^1:1,2^2:3,4
Hope anyone understands :)
Use objects instead of arrays. When you use string indexes on array elements the array gets turned into an object and some of the array methods might not work properly afterwards. Why not just use an object from the beginning then.
WARNING !! If you use named indexes, JavaScript will redefine the array to a standard object. After that, some array methods and properties will produce incorrect results.
this is taken from https://www.w3schools.com.
Here is an example of how to use it:
// Object = {} instead of array = []
var myObject = {};
myObject['category'] = {1: {subcategories: {1:[1,2], 2: [3,4] }} };
// For example
var anotherObject = {};
anotherObject['category'] = {1: {}, 2: {}};
anotherObject['category'][1] = [1,2];
anotherObject['category'][2] = [3,4];
// Edit: example 3
// ---------------
// result from database JSON format
var resultFromDB = {"category": {"1": {"subcategories": {"1": {"subsubcategories": [1,2]}, "2": {"subsubcategories": [3,4] }}}} };
// example of building new object from input
var myNewObject = {};
var type;
// go through the first level
for(var index in resultFromDB)
{
// in case you needed this is how you would check type of input
type = typeof resultFromDB[index];
if((type === "object") && (type !== null)) // check if its an object
{
// set myNewObject[index] to new object
myNewObject[index] = {};
// go through second level
for(var subIndex in resultFromDB[index])
{
// set myNewObject[index][subIndex] as new object
myNewObject[index][subIndex] = {};
// go through third level
for(var subSubIndex in resultFromDB[index][subIndex])
{
// simply use an '=' to get all from that level
myNewObject[index][subIndex][subSubIndex] = resultFromDB[index][subIndex][subSubIndex];
}
}
}
}
console.log("This is the new object");
console.log(myNewObject);
console.log("\n");
console.log("This is the original object");
console.log(myNewObject);
// If you need to extract in multiple places you could make a function for quick access
function returnObject(incomingObject)
{
var myNewObject = {};
var type;
// ... copy paste here all the above code from example 3 except resultFromDB
return myNewObject;
}
// then just call it from anywhere
var theNewestObject = returnObject(resultFromDB);
// Example 3, that's it. If your incoming results from the database are in JSON format (they should be), this should work for you exactly as it is. Tell me if it works, if not post your incoming (from the db) data so I can see exactly what it looks like and then I can tweak the function.