Deneb: dynamically change the definition of a tooltip

[Sergiy]

Hi,

Here is my Deneb code:

{
  "data": {"name": "dataset"},
  "layer": [
    {
      "mark": {
        "type": "bar",
        "opacity": 0.3
      },
      "encoding": {
        "x": {"field": "b"},
        "tooltip": [
          {"field": "a"},
          {"field": "b"},
          {"field": "b__highlight", "title": "Highlighted"}
        ]
      }
    },
    {
      "mark": {
        "type": "bar",
        "tooltip": true
      },
      "encoding": {
        "x": {
          "field": "b__highlight"
        },
        "tooltip": [
          {"field": "a"},
          {"field": "b"},
          {"field": "b__highlight", "title": "Highlighted"}
        ],
        "opacity": {
          "condition": {
            "test": {
              "field": "__selected__",
              "equal": "off"
            },
            "value": 0
          },
          "value": 1
        }
      }
    }
  ],
  "encoding": {
    "y": {
      "field": "a",
      "type": "nominal"
    },
    "x": {
      "type": "quantitative",
      "axis": {"title": "b"}
    }
  }
}

There are two layers. Each layer has its own tooltip definition.

What I'd like is to have the ability to dynamically change the definition of the tooltip in the 2d layer.

For example, if "b_highlightStatus" = "on" then the definition should be as following:

"tooltip": [
  {"field": "a"},
  {"field": "b"},
  {"field": "b__highlight", "title": "Highlighted"}
]

... and if "b_highlightStatus" <> "on" then the definition should read as:

"tooltip": [
  {"field": "a"},
  {"field": "b"}
]

I tried to use exp & params but could not succeed.

I would be grateful for a short example of how to solve the issue.

Thanks

[TomMartens]

Hey @Sergiy ,

please prepare a pbix that contains sample data, but still represents your data model (tables, relationships, calculated columns, and measures). Upload the pbix to OneDrive, Google Drive, or Dropbox, and share the link.

Regards,

Tom

[Sergiy]

Hi @TomMartens .

I uploaded a sample file:

https://www.dropbox.com/scl/fi/l7qs306bklj0fc2lnr0tq/deneb_tooltip.pbix?rlkey=rx2pk9mopvwqhp7bq1fp08... 

The code is a bit different, but the idea is the same.

There are two layers. Each layer has its own tooltip definition.

What I'd like is to have the ability to dynamically change the definition of the tooltip in the 2d layer.

For example, if "b_highlightStatus" = "on" then the definition should be as following:

"tooltip": [
  {"field": "a"},
  {"field": "b"},
  {"field": "b__highlight", "title": "Highlighted"}
]

... and if "b_highlightStatus" <> "on" then the definition should read as:

"tooltip": [
  {"field": "a"},
  {"field": "b"}
]

[Sergiy · Accepted solution]

the code I was looking for looks like the following

{
  "data": {"name": "dataset"},
  "layer": [
    {
      "mark": {
        "type": "bar",
        "opacity": 0.3, 
        "tooltip": {
          "expr": "datum.b__highlight==null? {'a':datum['a'],'b':datum.b}:{'a':datum.a,'b':datum.b,'Highlighted':datum.b__highlight}"
        }
      },
      "encoding": {"x": {"field": "b"}}
    },
    {
      "mark": {
        "type": "bar",
        "tooltip": {
          "expr": "datum.b__highlightStatus=='on'? {'a':datum.a,'b':datum.b,'Highlighted':datum.b__highlight}:{'a':datum.a,'b':datum.b}"
        }
      },
      "encoding": {
        "x": {"field": "b__highlight"},
        "opacity": {
          "condition": {
            "test": {
              "field": "__selected__",
              "equal": "off"
            },
            "value": 0
          },
          "value": 1
        }
      }
    }
  ],
  "encoding": {
    "y": {
      "field": "a",
      "type": "nominal"
    },
    "x": {
      "type": "quantitative",
      "axis": {"title": "b"}
    }
  }
}