Top Item Chart
Top Item charts show information from the document with the greatest or smallest value for a specified field.
When you create a Top Item chart, you specify:
- The field by which to sort your collection.
- Whether you want to sort in ascending or descending order.
- The fields you want to display from the first document returned by your specified sort.
Top Item Chart Encoding Channels
Top Item charts utilize the following encoding channels:
Encoding Channel | Description |
|---|---|
Sort | The field by which to sort the collection. You can specify an
ascending or descending sort. |
Display | The fields to display from the top item in the collection after
sorting. |
You cannot perform aggregations on Display fields.
Use Cases
Use Top Item charts to show information about the most extreme or most recent instance of a particular field value. For example, you can use Top Item charts to show information on:
- The most recent reading from a collection of sensor data, such as temperature readings.
- The highest rated movie in a collection.
- The cheapest available room in a collection of available hotel listings.
- The largest sale recorded in the past month (when combining a Top Item chart with date filters).
Examples
The following chart uses a data source containing Sample AirBnB
Listing data and shows information on the
document with the highest monthly_price in the collection:
The chart sorts the documents based on monthly_price in
descending order, and returns the first document appearing in the sort.
The chart displays the following fields:
monthly_priceproperty_typecountrysuburb