jQuery

Question

Is there are a way to recursively loop over all the nested properties of a JS/jQuery object?

For example, given this object

var x = {
    'name': 'a',
    'level': 1,
    'children': [{
        'name': 'b',
        'level': 2,
        'children': [{
            'name': 'c',
            'level': 3,
            'children': [{
            ...
            }]
        }]},
        ...
    }]
}

how could I loop over the objects named 'a' and their children, 'b' and their children, 'c' and their children, ad infinitum?

Asciiom · Accepted Answer

A recursive approach seems best, something like this:

function recursiveIteration(object) {
    for (var property in object) {
        if (object.hasOwnProperty(property)) {
            if (typeof object[property] == "object"){
                recursiveIteration(object[property]);
            }else{
                //found a property which is not an object, check for your conditions here
            }
        }
    }
}

This is a working fiddle

Ungureanu Liviu · Answer

Your JSON is not well formatted but you can "visit" each item as below:

<html>
<head>
    <title>test</title>
    <script type="text/javascript">
        var x = {
                "name": "a",
                "level": 1,
                "children": [
                    {
                        "name": "b",
                        "level": 2,
                        "children": [
                            {
                                "name": "c",
                                "level": 3,
                                "children": [
                                    {
                                        "sss": 23
                                    }
                                ]
                            }
                        ]
                    }
                ]
            };

         function visit(obj){
            for(var prop in obj){
                if(typeof(obj[prop]) == 'object'){
                    if(Object.prototype.toString.call(obj[prop]) == '[object Array]'){
                        for(var i = 0; i < obj[prop].length; i++){
                            document.write("<br />the element " + prop + " (array) was visited");
                            visit(obj[prop][i]);                                
                        }
                    }else{
                        document.write("<br />the element " + prop + " (object) was visited");
                        visit(obj[prop]);
                    }
                }else{
                    document.write("<br />the element " + prop + " = " + obj[prop] + " was visited");
                }
            }
        }

        visit(x);

    </script>
</head>
<body>

</body>

jQuery - How to recursively loop over an object's nested properties?

Tags:

developarvin

2 Answers

Asciiom

Ungureanu Liviu

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