interactive_stocks_nearest_index.vg.json

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    {
      "name": "source_0",
      "url": "data/stocks.csv",
      "format": {"type": "csv", "parse": {"date": "date"}}
    },
    {
      "name": "data_0",
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      "name": "unit",
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      ]
    },
    {
      "name": "index",
      "update": "vlSelectionResolve(\"index_store\", \"union\", true, true)"
    },
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              "source": "scope",
              "type": "mousemove",
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            }
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          "force": true
        },
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    },
    {
      "name": "index_tuple_fields",
      "value": [{"field": "date", "channel": "x", "type": "E"}]
    },
    {
      "name": "index_toggle",
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    },
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      "name": "index_modify",
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          "events": {"signal": "index_tuple"},
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          "groupby": ["symbol"]
        }
      },
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      },
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              "stroke": {"scale": "color", "field": "symbol"},
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              },
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              "y": {"scale": "y", "field": "price"},
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                "signal": "isValid(datum[\"date\"]) && isFinite(+datum[\"date\"]) && isValid(datum[\"price\"]) && isFinite(+datum[\"price\"])"
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        }
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          "fill": {"value": "transparent"},
          "stroke": {"value": "#4c78a8"},
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}