docs(examples): Bar Chart with Full-Height Hover Targets for Tooltip

examples/compiled/interactive_histogram_full_height_hover.vg.json

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+{
+  "$schema": "https://vega.github.io/schema/vega/v5.json",
+  "background": "white",
+  "padding": 5,
+  "width": 200,
+  "height": 200,
+  "style": "cell",
+  "data": [
+    {
+      "name": "hover_store",
+      "transform": [{"type": "collect", "sort": {"field": "_vgsid_"}}]
+    },
+    {
+      "name": "source_0",
+      "url": "data/movies.json",
+      "format": {"type": "json"},
+      "transform": [
+        {"type": "identifier", "as": "_vgsid_"},
+        {
+          "type": "extent",
+          "field": "IMDB Rating",
+          "signal": "layer_1_bin_maxbins_10_IMDB_Rating_extent"
+        },
+        {
+          "type": "bin",
+          "field": "IMDB Rating",
+          "as": [
+            "bin_maxbins_10_IMDB Rating",
+            "bin_maxbins_10_IMDB Rating_end"
+          ],
+          "signal": "layer_1_bin_maxbins_10_IMDB_Rating_bins",
+          "extent": {"signal": "layer_1_bin_maxbins_10_IMDB_Rating_extent"},
+          "maxbins": 10
+        },
+        {
+          "type": "aggregate",
+          "groupby": [
+            "bin_maxbins_10_IMDB Rating",
+            "bin_maxbins_10_IMDB Rating_end"
+          ],
+          "ops": ["count"],
+          "fields": [null],
+          "as": ["__count"]
+        }
+      ]
+    },
+    {
+      "name": "data_0",
+      "source": "source_0",
+      "transform": [
+        {"type": "identifier", "as": "_vgsid_"},
+        {
+          "type": "filter",
+          "expr": "isValid(datum[\"bin_maxbins_10_IMDB Rating\"]) && isFinite(+datum[\"bin_maxbins_10_IMDB Rating\"])"
+        }
+      ]
+    },
+    {
+      "name": "data_1",
+      "source": "source_0",
+      "transform": [
+        {
+          "type": "filter",
+          "expr": "isValid(datum[\"bin_maxbins_10_IMDB Rating\"]) && isFinite(+datum[\"bin_maxbins_10_IMDB Rating\"])"
+        }
+      ]
+    }
+  ],
+  "signals": [
+    {
+      "name": "unit",
+      "value": {},
+      "on": [
+        {"events": "mousemove", "update": "isTuple(group()) ? group() : unit"}
+      ]
+    },
+    {
+      "name": "hover",
+      "update": "vlSelectionResolve(\"hover_store\", \"union\", true, true)"
+    },
+    {
+      "name": "hover_tuple",
+      "on": [
+        {
+          "events": [{"source": "scope", "type": "mouseover"}],
+          "update": "datum && item().mark.marktype !== 'group' ? {unit: \"layer_0\", _vgsid_: (item().isVoronoi ? datum.datum : datum)[\"_vgsid_\"]} : null",
+          "force": true
+        },
+        {"events": [{"source": "view", "type": "mouseout"}], "update": "null"}
+      ]
+    },
+    {
+      "name": "hover_toggle",
+      "value": false,
+      "on": [
+        {
+          "events": [{"source": "scope", "type": "mouseover"}],
+          "update": "event.shiftKey"
+        },
+        {"events": [{"source": "view", "type": "mouseout"}], "update": "false"}
+      ]
+    },
+    {
+      "name": "hover_modify",
+      "on": [
+        {
+          "events": {"signal": "hover_tuple"},
+          "update": "modify(\"hover_store\", hover_toggle ? null : hover_tuple, hover_toggle ? null : true, hover_toggle ? hover_tuple : null)"
+        }
+      ]
+    }
+  ],
+  "marks": [
+    {
+      "name": "layer_0_marks",
+      "type": "rect",
+      "style": ["bar"],
+      "interactive": true,
+      "from": {"data": "data_0"},
+      "encode": {
+        "update": {
+          "tooltip": {
+            "signal": "{\"IMDB Rating (binned)\": !isValid(datum[\"bin_maxbins_10_IMDB Rating\"]) || !isFinite(+datum[\"bin_maxbins_10_IMDB Rating\"]) ? \"null\" : format(datum[\"bin_maxbins_10_IMDB Rating\"], \"\") + \" – \" + format(datum[\"bin_maxbins_10_IMDB Rating_end\"], \"\"), \"Count of Records\": format(datum[\"__count\"], \"\")}"
+          },
+          "fill": {"value": "#eee"},
+          "opacity": [
+            {
+              "test": "length(data(\"hover_store\")) && vlSelectionIdTest(\"hover_store\", datum)",
+              "value": 0.5
+            },
+            {"value": 0}
+          ],
+          "ariaRoleDescription": {"value": "bar"},
+          "description": {
+            "signal": "\"IMDB Rating (binned): \" + (!isValid(datum[\"bin_maxbins_10_IMDB Rating\"]) || !isFinite(+datum[\"bin_maxbins_10_IMDB Rating\"]) ? \"null\" : format(datum[\"bin_maxbins_10_IMDB Rating\"], \"\") + \" – \" + format(datum[\"bin_maxbins_10_IMDB Rating_end\"], \"\")) + \"; Count of Records: \" + (format(datum[\"__count\"], \"\"))"
+          },
+          "x2": {
+            "scale": "x",
+            "field": "bin_maxbins_10_IMDB Rating",
+            "offset": 1
+          },
+          "x": {"scale": "x", "field": "bin_maxbins_10_IMDB Rating_end"},
+          "y": {"value": 0},
+          "y2": {"field": {"group": "height"}}
+        }
+      }
+    },
+    {
+      "name": "layer_1_marks",
+      "type": "rect",
+      "style": ["bar"],
+      "interactive": false,
+      "from": {"data": "data_1"},
+      "encode": {
+        "update": {
+          "fill": {"value": "#4c78a8"},
+          "ariaRoleDescription": {"value": "bar"},
+          "description": {
+            "signal": "\"IMDB Rating (binned): \" + (!isValid(datum[\"bin_maxbins_10_IMDB Rating\"]) || !isFinite(+datum[\"bin_maxbins_10_IMDB Rating\"]) ? \"null\" : format(datum[\"bin_maxbins_10_IMDB Rating\"], \"\") + \" – \" + format(datum[\"bin_maxbins_10_IMDB Rating_end\"], \"\")) + \"; Count of Records: \" + (format(datum[\"__count\"], \"\"))"
+          },
+          "x2": {
+            "scale": "x",
+            "field": "bin_maxbins_10_IMDB Rating",
+            "offset": 1
+          },
+          "x": {"scale": "x", "field": "bin_maxbins_10_IMDB Rating_end"},
+          "y": {"scale": "y", "field": "__count"},
+          "y2": {"scale": "y", "value": 0}
+        }
+      }
+    }
+  ],
+  "scales": [
+    {
+      "name": "x",
+      "type": "linear",
+      "domain": {
+        "signal": "[layer_1_bin_maxbins_10_IMDB_Rating_bins.start, layer_1_bin_maxbins_10_IMDB_Rating_bins.stop]"
+      },
+      "range": [0, {"signal": "width"}],
+      "bins": {"signal": "layer_1_bin_maxbins_10_IMDB_Rating_bins"},
+      "zero": false
+    },
+    {
+      "name": "y",
+      "type": "linear",
+      "domain": {"data": "data_1", "field": "__count"},
+      "range": [{"signal": "height"}, 0],
+      "nice": true,
+      "zero": true
+    }
+  ],
+  "axes": [
+    {
+      "scale": "y",
+      "orient": "left",
+      "gridScale": "x",
+      "grid": true,
+      "tickCount": {"signal": "ceil(height/40)"},
+      "domain": false,
+      "labels": false,
+      "aria": false,
+      "maxExtent": 0,
+      "minExtent": 0,
+      "ticks": false,
+      "zindex": 0
+    },
+    {
+      "scale": "x",
+      "orient": "bottom",
+      "grid": false,
+      "title": "IMDB Rating (binned)",
+      "labelFlush": true,
+      "labelOverlap": true,
+      "tickCount": {"signal": "ceil(width/10)"},
+      "zindex": 0
+    },
+    {
+      "scale": "y",
+      "orient": "left",
+      "grid": false,
+      "title": "Count of Records",
+      "labelOverlap": true,
+      "tickCount": {"signal": "ceil(height/40)"},
+      "zindex": 0
+    }
+  ]
+}

examples/specs/interactive_histogram_full_height_hover.vl.json

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+{
+  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
+  "data": {"url": "data/movies.json"},
+  "layer": [
+    {
+      "params": [
+        {
+          "name": "hover",
+          "select": {"type": "point", "on": "mouseover", "clear": "mouseout"}
+        }
+      ],
+      "mark": {"type": "bar", "color": "#eee", "tooltip": true},
+      "encoding": {
+        "x": {"bin": true, "field": "IMDB Rating"},
+        "opacity": {
+          "condition": {"test": {"param": "hover", "empty": false}, "value": 0.5},
+          "value": 0
+        },
+        "detail": [{"aggregate": "count"}]
+      }
+    },
+    {
+      "mark": "bar",
+      "encoding": {
+        "x": {"bin": true, "field": "IMDB Rating"},
+        "y": {"aggregate": "count"}
+      }
+    }
+  ]
+}

site/_data/examples.json

@@ -791,6 +791,10 @@
         "name": "interactive_bar_select_highlight",
         "title": "Bar Chart with Highlighting on Hover and Selection on Click"
       },
+      {
+        "name": "interactive_histogram_full_height_hover",
+        "title": "Histogram with Full-Height Hover Targets for Tooltip"
+      },
       {
         "name": "interactive_legend",
         "title": "Interactive Legend"