softwords opened a new issue #12636:
URL: https://github.com/apache/incubator-echarts/issues/12636
### Version
4.7.0
### Steps to reproduce
A piecewise visual map that specifies categories cannot be applied to
dimension 0 of data.
This option works, specifying dimension 2:
```
option = {
"series": [
{
"encode": {
"itemId": 0,
"itemName": 0,
"value": "value",
"y": "value",
"x": "rowID"
},
"type": "bar",
"color": "#1f77b4"
}
],
"dataset": {
"dimensions": [
"rowID",
"value",
"id2"
],
source: [
["A", 1087,"A" ],
[ "B", 244,"B" ],
[ "C", 653,"C" ],
]
},
"xAxis": {
"type": "category",
},
"yAxis": {
"type": "value"
},
"visualMap": {
"id": "highlighter",
"type": "piecewise",
"show": false,
dimension: 2,
"categories": [
"A"
],
"inRange": {},
"outOfRange": {
"opacity": 0.4
}
}
}
```
This also, works: when dimension is omitted, it uses the last dimension as
documented:
```
option = {
"series": [
{
"encode": {
"itemId": 0,
"itemName": 0,
"value": "value",
"y": "value",
"x": "rowID"
},
"type": "bar",
"color": "#1f77b4"
}
],
"dataset": {
"dimensions": [
"rowID",
"value",
"id2"
],
source: [
["A", 1087,"A" ],
[ "B", 244,"B" ],
[ "C", 653,"C" ],
]
},
"xAxis": {
"type": "category",
},
"yAxis": {
"type": "value"
},
"visualMap": {
"id": "highlighter",
"type": "piecewise",
"show": false,
"categories": [
"B"
],
"inRange": {},
"outOfRange": {
"opacity": 0.4
}
}
}
```
But this does not work: all values are "out of range":
```
option = {
"series": [
{
"encode": {
"itemId": 0,
"itemName": 0,
"value": "value",
"y": "value",
"x": "rowID"
},
"type": "bar",
"color": "#1f77b4"
}
],
"dataset": {
"dimensions": [
"rowID",
"value",
"id2"
],
source: [
["A", 1087,"A" ],
[ "B", 244,"B" ],
[ "C", 653,"C" ],
]
},
"xAxis": {
"type": "category",
},
"yAxis": {
"type": "value"
},
"visualMap": {
"id": "highlighter",
"type": "piecewise",
"show": false,
dimension: 0,
"categories": [
"C"
],
"inRange": {},
"outOfRange": {
"opacity": 0.4
}
}
}
```
### What is expected?
The outputs from each of these options should show 1 highlighted bar
### What is actually happening?
The third option , using dimension 0, does nothing. Same behaviour when
using the dimension name rather than dimension offset.
---
Want to be able to track when a particular category is "selected" by the
user. This "selection" may occur through clicking on the series, or through
other activity on the page.
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