How to include a range slider to transform Data in Vega? - vega

Question

What I have tried:
I included a range slider. This range slider is meant to change the way the data is filtered (see transform). (Almost like in this example https://vega.github.io/vega/examples/population-pyramid/)
The Issue:
When I change the slider's position on the graph, there is no change in the graph's input.
Question:
How could I change the code, so that my input parameters are changed through the user's interaction with the range slider?
{
"$schema": "https://vega.github.io/schema/vega/v5.json",
"width": 400,
"height": 200,
"padding": 20,
"signals": [
{
"name": "tooltip",
"value": {},
"on": [
{"events": "rect:mouseover", "update": "datum"},
{"events": "rect:mouseout", "update": "{}"}
]
},
{
"name": "Y_Value",
"bind":{"input": "range", "min": 0, "max": 100, "step": 1},
"value": 100
}
],
"data": [
{
"name": "table",
"values": [
{"category": "A", "amount": 28},
{"category": "B", "amount": 55},
{"category": "C", "amount": 43},
{"category": "D", "amount": 91},
{"category": "E", "amount": 81},
{"category": "F", "amount": 53},
{"category": "G", "amount": 19},
{"category": "H", "amount": 87}
]
},
{
"name": "range",
"source": "table",
"transform": [
{"type": "filter", "expr": "datum.amount <= Y_Value"}
]
}
],
"scales": [
{
"name": "xscale",
"type": "band",
"domain": {"data": "table", "field": "category"},
"range": "width",
"padding": 0.05,
"round": true
},
{
"name": "yscale",
"domain": {"data": "table", "field": "amount"},
"nice": true,
"range": "height"
}
],
"axes": [
{
"orient": "bottom",
"scale": "xscale",
"encode": {
"labels": {
"interactive": true,
"update": {
"tooltip": {"signal": "datum.label"}
}
}
}
},
{ "orient": "left", "scale": "yscale" }
],
"marks": [
{
"type": "rect",
"from": {"data":"table"},
"encode": {
"enter": {
"x": {"scale": "xscale", "field": "category"},
"width": {"scale": "xscale", "band": 1},
"y": {"scale": "yscale", "field": "amount"},
"y2": {"scale": "yscale", "value": 0}
},
"update": {
"fill": {"value": "steelblue"}
},
"hover": {
"fill": {"value": "red"}
}
}
},
{
"type": "text",
"encode": {
"enter": {
"align": {"value": "center"},
"baseline": {"value": "bottom"},
"fill": {"value": "#333"}
},
"update": {
"x": {"scale": "xscale", "signal": "tooltip.category", "band": 0.5},
"y": {"scale": "yscale", "signal": "tooltip.amount", "offset": -2},
"text": {"signal": "tooltip.amount"},
"fillOpacity": [
{"test": "datum === tooltip", "value": 0},
{"value": 1}
]
}
}
}
]
}

Answer 1

After some time I have figured this:
{
"$schema": "https://vega.github.io/schema/vega/v5.json",
"width": 400,
"height": 200,
"padding": 20,
"title": {"text":"A title", "anchor":"middle"},
"signals": [
{
"name": "tooltip",
"value": {},
"on": [
{"events": "rect:mouseover", "update": "datum"},
{"events": "rect:mouseout", "update": "{}"}
]
},
{
"name": "Threshold",
"bind":{"input": "range", "min": 0, "max": 100, "step": 1},
"value": 0
}
],
"data": [
{
"name": "table",
"values": [
{"category": "Mon", "amount": 28},
{"category": "Tue", "amount": 55},
{"category": "wed", "amount": 43},
{"category": "Thu", "amount": 91},
{"category": "Fri", "amount": 81},
{"category": "Sat", "amount": 53},
{"category": "Sun", "amount": 19}
]
},
{
"name": "range",
"source": "table",
"transform": [
{"type": "filter", "expr": "datum.amount >= Threshold"}
]
}
],
"scales": [
{
"name": "xscale",
"type": "band",
"domain": {"data": "table", "field": "category"},
"range": "width",
"padding": 0.05,
"round": true
},
{
"name": "yscale",
"domain": {"data": "table", "field": "amount"},
"nice": true,
"range": "height"
}
],
"axes": [
{
"orient": "bottom",
"scale": "xscale",
"encode": {
"labels": {
"interactive": true,
"update": {
"tooltip": {"signal": "datum.label"}
}
}
}
},
{ "orient": "left", "scale": "yscale", "title": "Y Title" }
],
"marks": [
{
"type": "rect",
"from": {"data":"range"},
"encode": {
"enter": {
"x": {"scale": "xscale", "field": "category"},
"width": {"scale": "xscale", "band": 1},
"y": {"scale": "yscale", "field": "amount"},
"y2": {"scale": "yscale", "value": 0}
},
"update": {
"fill": {"value": "steelblue"}
},
"hover": {
"fill": {"value": "red"}
}
}
},
{
"type": "text",
"encode": {
"enter": {
"align": {"value": "center"},
"baseline": {"value": "bottom"},
"fill": {"value": "#333"}
},
"update": {
"x": {"scale": "xscale", "signal": "tooltip.category", "band": 0.5},
"y": {"scale": "yscale", "signal": "tooltip.amount", "offset": -2},
"text": {"signal": "tooltip.amount"},
"fillOpacity": [
{"test": "datum === tooltip", "value": 0},
{"value": 1}
],
"align": {"value": "center"},
"baseline": {"value": "bottom"},
"fill": {"value": "#333"}
}
}
}
]
}