[jQuery] JSON: Cascading Dropdowns?

[paulinstl]

Does anyone have an example of a two step Cascading Dropdown working
from a single JSON object?

Here's an example of my JSON.  Product Size > Product Width

"productlist":[{
            "size":"XL",
            "details":[
                {
                    "id":"1",
                    "width":"40",
                    "quantityleft":"4"
                },
                {
                    "id":"2",
                    "width":"24",
                    "quantityleft":"6"
                },
                {
                    "id":"3",
                    "width":"22",
                    "quantityleft":"1"
                },
                "size":"S",
            "details":[
                {
                    "id":"11",
                    "width":"40",
                    "quantityleft":"4"
                },
                {
                    "id":"12",
                    "width":"24",
                    "quantityleft":"6"
                },
                {
                    "id":"13",
                    "width":"22",
                    "quantityleft":"1"
                }
            ]
        }]