使用jQuery循环遍历嵌套对象

Question

Hey everyone I am trying t find the most dynamic way to loop through an array and return specific values return specific values... The json is deeply structured and may change, could there be a $.each() formula that can help?

Example:

var myobj = {
    obj1: { key1: 'val1', key2: 'val2' },
    obj2: { key1: '2val1', 
           key2: { nest1: 'val1', nest2: 'val2', nest3: 'val3' }, 
           key3: { nest1: 'K3val1', nest2: 'K3val2', 
                 nest3: [
                         { nest1: 'val1', nest2: 'val2', nest3: 'val3' }, 
                         { nest1: 'val1', nest2: 'val2', nest3: 'val3' }
                        ]
                 }
          },
    obj3: { key1: 'dddddval1', key2: 'val2' }
    }

now lets say i want to retrieve " K3val2 " value but instead of hardcoding it like so: myobj.obj2.key3.nest2 is there a dynamic way I do this with $.each() mybe?

Answer 1

You can simply nest calls to $.each :

Live Example | Live Source

// Loop the top level
$.each(myobj, walker);

function walker(key, value) {
    // ...do what you like with `key` and `value`

    if (value !== null && typeof value === "object") {
        // Recurse into children
        $.each(value, walker);
    }
}

If you want to know how deep you are, you can do that too:

Live Example | Live Source

var path = "";

// Loop the top level
$.each(myobj, walker);

function walker(key, value) {
    var savepath = path;

    path = path ? (path + "." + key) : key;

    // ...do what you like with `key` and `value`

    if (value !== null && typeof value === "object") {
        // Recurse into children
        $.each(value, walker);
    }

    path = savepath;
}