How to loop through JSON Data?

Question

I have an ashx page that returns the following JSON data that I would like to be able to loop through and add to values to a bunch of li's in a ul.

My question is how do I loop through to retrieve the values.

The data that is returned from the ashx look slike this

{"ImageCollection":
    {
        "Images":
            [
                {
                    "ImageID":"62",
                    "CatID":"1",
                    "Location":"/Images/62.gif",
                    "FullHeight":"466","FullWidth":"606"
                },
                {
                    "ImageID":"63",
                    "CatID":"1",
                    "Location":"/Images/63.gif",
                    "FullHeight":"205",
                    "FullWidth":"751"
                }
            ]
    }
}

and if I try this

<script type="text/javascript">
    $.getJSON("/Service/GetJson.ashx?data=images", function(data) {
        var jsObjectData = eval(data);
        $.each(data, function(i, item) {
            alert(data[i].ImageID);
        });
    });
</script>

I get a single alert that says undefined. What am I doing wrong?

Answer 1

There's no need to eval in this case, you can just do this:

$.getJSON("/Service/GetJson.ashx?data=images", function(data) {
    var jsObjectData = data.ImageCollection.Images;
    $.each(jsObjectData, function(i, item) {
        alert(item.ImageID);
    });
});

$.getJSON() already converts it to an object, so just treat it like that, data is the overall object, and inside you want to loop though the ImageCollection.Images, so pass that to your $.each() call.