CODEWITHSUNDEEP
javascriptjqueryjson
RoverK
RoverK

Reputation: 43

each within each within each

I'm new working with JSON and the getJSON function etc and I'm trying to get data from a JSON that goes down several levels and can have multiple children. At the minute I can see the values I want by using .each with another .each such as:

$.each(data, function(i, value1) {
    $.each(value1, function(i, value2) {
        $.each(value2, function(i, value3) {
            $.each(value3, function(i, value4) {
                $.each(value4, function(i, value5) {
                    $.each(value5, function(i, value6) {
                        alert ("we got "+i);
                    });

The only problem is, I won't always know what is in the JSON and it could have unlimited children. So how would I go about making it dynamic as such?

Basically what I'm looking for is something to keep checking for children until it gets to the lowest level.

Also, I know the value i at the very end is the index for whatever value is in the JSON,

Is there any way to automate this also so that I could check for say, 'name' in the JSON and it would return the value of 'name'?

Here is a sample of the JSON i'm trying to work with:

[
 {
   "children": [
    {
      "children": [
       {
        "children": [
          {
            "children": [
              {
                "bucketPath": "AUDIO\\audio0.mp3",
                "id": 305,
                "modified": "2012-08-02T10:06:52",
                "name": "audio0.mp3",
                "state": "closed"
              }

Upvotes: 3

Views: 261

Answers (3)

Bergi
Bergi

Reputation: 665574

Use recursion:

function recurse(name, obj) {
    if (!obj || typeof obj != "object")
        alert("found leaf '"+name+"': "+obj);
    else
        $.each(obj, recurse);
}
recurse("root", data);

EDIT: Based on your JSON, one could make it more specific:

function recurse(arr) {
   for (var i=0; i<arr.length; i++)
       for (var prop in arr[i])
           if (prop == "children") // && arr[i].children instanceof Array
               recurse(arr[i].children);
           else
               alert("we got "+prop+": "+arr[i][prop]);
}
recurse(data);

Upvotes: 9

Zach Shipley
Zach Shipley

Reputation: 1092

When JSON gets somewhat complex like this, I think dojo's JSONQuery is a good solution. It's analogous to XPath if you're familiar with that. Queries can get quite complex, but here's an example of a query to search for a property with a given name at any depth:

var results = dojox.json.query("..property_name", json_data);

There's a good article detailing the use of dojo's JSONQuery here: http://www.sitepen.com/blog/2008/07/16/jsonquery-data-querying-beyond-jsonpath/

Upvotes: 0

Alnitak
Alnitak

Reputation: 340055

This sounds like it needs JPath or JSONPath

var name = jpath(data, '//name');

Upvotes: 3

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