Creating multilevel hierarchies
Using the mapping object for JSON, you can create multilevel hierarchies from fields of any type.
In this guide, we’ll create a Food hierarchy with Category, Item, and Serving Size levels based on the data below:
[
{
"Category": "Breakfast",
"Item": "Frittata",
"Serving Size": "4.8 oz (136 g)",
"Calories": 300
},
{
"Category": "Breakfast",
"Item": "Boiled eggs",
"Serving Size": "4.8 oz (135 g)",
"Calories": 250
}
]
Step 1. In the mapping object, set the type of Category, Item, and Serving Size fields as "level":
[
{
"Category": {
type: "level"
},
"Item": {
type: "level"
},
"Serving Size": {
type: "level"
},
"Calories": {
type: "number"
}
},
{
"Category": "Breakfast",
"Item": "Frittata",
"Serving Size": "4.8 oz (136 g)",
"Calories": 300
},
{
"Category": "Breakfast",
"Item": "Boiled eggs",
"Serving Size": "4.8 oz (135 g)",
"Calories": 250
}
]
Step 2. Use the hierarchy, parent, and level properties of the mapping object to create the Food hierarchy:
[
{
"Category": {
type: "level",
hierarchy: "Food"
},
"Item": {
type: "level",
hierarchy: "Food",
level: "Dish",
parent: "Category"
},
"Serving Size": {
type: "level",
hierarchy: "Food",
level: "Size",
parent: "Dish"
},
"Calories": {
type: "number"
}
},
{
"Category": "Breakfast",
"Item": "Frittata",
"Serving Size": "4.8 oz (136 g)",
"Calories": 300
},
{
"Category": "Breakfast",
"Item": "Boiled eggs",
"Serving Size": "4.8 oz (135 g)",
"Calories": 250
}
]
See how this dataset will be visualized in WebDataRocks:
Check out a live demo on CodePen.