Parsing JSON object using jQuery

Question

I am trying to parse the json object using jquery but it is giving me error that cannot get the length of a null object. I am not able to find the reason. Please help me in finding the issue. Here is what i am doing

            var slider_images = {
                "image": [
                            {"fname":"1", "caption":"this is 1"},
                            {"fname":"2", "caption":"this is 2"},
                            {"fname":"3", "caption":"this is 3"},
                            {"fname":"4", "caption":"this is 4"},
                            {"fname":"5", "caption":"this is 5"},
                            {"fname":"6", "caption":"this is 6"},
                            {"fname":"7", "caption":"this is 7"},
                            {"fname":"8", "caption":"this is 8"}
                        ]
            };

            var imageObj = $.parseJSON(slider_images.image);
            $.each(imageObj,function() {
                //alert("fname is::"+this['fname']);
                alert("1");
            });

I want to get the fname and caption for all the subobjects that fall under image. Please let me know where I am going wrong...

Thanks!

@Don: that does not work.... Andrew gave me the sol to it below... — unix_user
– unix_user, Commented Jan 13, 2013 at 5:10

Flash · Accepted Answer · 2013-01-13 05:04:11Z

4

Parsing JSON means converting a string into a JavaScript object. You already have an object so have nothing to 'parse'.

You can just use your object like this:

 $.each(slider_images.image, function() {
        console.log(this);
 });

answered Jan 13, 2013 at 5:04

Flash

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6 Comments

user34537 Over a year ago

I kind of notice that but my eyes went to the comma error first

Flash Over a year ago

The comma will also cause problems in some browsers :)

unix_user Over a year ago

@Andrew: In what case then i need to parse the JSON? Can you give me a small json object pointed so that I can understand when to parse it and when not...

user34537 Over a year ago

@unix_user: Well you parse strings to json such as {"Greeting": "Hi"} and stringify objects to jsonstrings var jsonobj={greating: HiVarOrLitereal}

Flash Over a year ago

@unix_user If you want to send your object over HTTP for example you would first convert the whole object to a string using JSON.stringify(obj). If you have a string and want it turned back into an object, use JSON.parse(str) or your jQuery version. The JSON string looks like an object '{"a":1,"b":2}', but it's a string until you parse it. JSON is useful because you can send objects as strings. Does that make sense?

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