Clever Geek Handbook

Iterating through nested firebase objects - Javascript

How to iterate through nested firebase objects.

Publications-
            |
            |-Folder1------
            |             |-hdgjg76675e6r-
            |             |               |-Name
            |             |               |-Author
            |             |
            |             |+-hdgjdsf3275e6k
            |             |+-hd345454575e6f
            |+-Folder2

In publications I have folders and in folders I have objects (containing properties like. Name, Author)

I've been going through the folders so far.

snapshot.forEach(function (snapshot) {
    var key = snapshot.key();
    var obj = snapshot.val();
    console.log(key);
    //output => Folder1 , Folder2 etc
});

When I type obj

console.log(obj);

Displayed

enter image description here

How do I iterate through the obj variable as it contains hdgjg76675e6r

, hdgjdsf3275e6k

etc. and further?

+2


source to share


3 answers


You obj

are a regular javascript object, you can just use a simple loop:

for(var key in obj) {
    console.log(obj[key]);
}


or you can use again forEach

in your snapshot:

folderSnapshot.forEach(function (objSnapshot) {
    objSnapshot.forEach(function (snapshot) {
        var val = snapshot.val();
        console.log(val); // Should print your object
    });
});
+3


source


Will the tree go deeper? If not, the best solution here would be to just do a double loop.

snapshot.forEach(function (snapshot) {
    var key = snapshot.key();
    var obj = snapshot.val();
    console.log(key);
    //output => Folder1 , Folder2 etc

    obj.forEach(function (book) {
        var title = book.title;
        var author = book.author;
    });
});


I don't need to overestimate things in my opinion.

+2


source


Here is a simple way how you can get an object of objects into an array of objects:

var myObject = {key1: {name: 'hello'}, key2: {name: 'hello2'}}; 
var myArrayOfObject = Object.values(myObject);

console.log(myArrayOfObject);
// Result: (2) [Object, Object]
+1


source






More articles:


All Articles