Stepped line
Show values that remain constant between categories.
Chart ID: steppedLine. Independent import: @revolist/charts/stepped-line.
Live example
Section titled “Live example”Loading chart…
Reading the chart
Section titled “Reading the chart”Show values that hold until the next observation, such as a tariff or inventory level. Horizontal segments emphasize discrete changes rather than continuous interpolation.
Data requirements
Section titled “Data requirements”Use one category per row and one or more numeric series. Values are finite numbers or explicit nulls; the row mapper does not group or aggregate repeated keys.
The roles below describe the chart's data contract. Generic category/value roles resolve from the dataset; explicitly bind specialized numeric roles as shown in the complete example.
| Data role | Field count |
|---|---|
category | 1 or more |
value | 1 or more |
series | 1 or more |
Download the complete sample data and settings (JSON). See Data & Configuration for mapping, null values, updates and lifecycle rules.
Create this chart
Section titled “Create this chart”Install the package using the installation guide, give the host an explicit height, and call createSteppedLineChart after the host mounts. This factory fixes the chart type to steppedLine.
<div id="chart" style="width: 100%; height: 450px;"></div>Complete runnable TypeScript example with sample data
import { createSteppedLineChart } from '@revolist/charts/stepped-line';
const container = document.getElementById('chart')!;const chart = await createSteppedLineChart({ container, "dataset": { "revision": 0, "source": "client", "categories": [ { "id": "preview-category-0", "label": "Jan", "path": [ "Jan" ], "labels": [ "Jan" ], "depth": 1, "kind": "leaf" }, { "id": "preview-category-1", "label": "Feb", "path": [ "Feb" ], "labels": [ "Feb" ], "depth": 1, "kind": "leaf" }, { "id": "preview-category-2", "label": "Mar", "path": [ "Mar" ], "labels": [ "Mar" ], "depth": 1, "kind": "leaf" }, { "id": "preview-category-3", "label": "Apr", "path": [ "Apr" ], "labels": [ "Apr" ], "depth": 1, "kind": "leaf" } ], "series": [ { "id": "preview-series-0", "label": "Current", "columnPath": [ "Current" ], "labels": [ "Current" ], "kind": "leaf", "prop": "preview-0" }, { "id": "preview-series-1", "label": "Previous", "columnPath": [ "Previous" ], "labels": [ "Previous" ], "kind": "leaf", "prop": "preview-1" } ], "values": [ [ 18, 29 ], [ 44, 27 ], [ 31, 45 ], [ 62, 50 ] ], "analyticalFrame": { "fields": [ { "id": "pivot:category", "label": "pivot:category", "role": "dimension", "semanticType": "category" }, { "id": "pivot:series", "label": "pivot:series", "role": "dimension", "semanticType": "category" }, { "id": "preview-series-0", "label": "Current", "role": "measure", "semanticType": "number", "sourceField": "preview-0" }, { "id": "preview-series-1", "label": "Previous", "role": "measure", "semanticType": "number", "sourceField": "preview-1" } ], "observations": [ { "id": "[\"preview-category-0\",\"preview-series-0\"]", "dimensions": { "pivot:category": { "value": "Jan", "label": "Jan", "path": [ "Jan" ], "labels": [ "Jan" ] }, "pivot:series": { "value": "Current", "label": "Current", "path": [ "Current" ], "labels": [ "Current" ] } }, "measures": { "preview-series-0": 18 } }, { "id": "[\"preview-category-0\",\"preview-series-1\"]", "dimensions": { "pivot:category": { "value": "Jan", "label": "Jan", "path": [ "Jan" ], "labels": [ "Jan" ] }, "pivot:series": { "value": "Previous", "label": "Previous", "path": [ "Previous" ], "labels": [ "Previous" ] } }, "measures": { "preview-series-1": 29 } }, { "id": "[\"preview-category-1\",\"preview-series-0\"]", "dimensions": { "pivot:category": { "value": "Feb", "label": "Feb", "path": [ "Feb" ], "labels": [ "Feb" ] }, "pivot:series": { "value": "Current", "label": "Current", "path": [ "Current" ], "labels": [ "Current" ] } }, "measures": { "preview-series-0": 44 } }, { "id": "[\"preview-category-1\",\"preview-series-1\"]", "dimensions": { "pivot:category": { "value": "Feb", "label": "Feb", "path": [ "Feb" ], "labels": [ "Feb" ] }, "pivot:series": { "value": "Previous", "label": "Previous", "path": [ "Previous" ], "labels": [ "Previous" ] } }, "measures": { "preview-series-1": 27 } }, { "id": "[\"preview-category-2\",\"preview-series-0\"]", "dimensions": { "pivot:category": { "value": "Mar", "label": "Mar", "path": [ "Mar" ], "labels": [ "Mar" ] }, "pivot:series": { "value": "Current", "label": "Current", "path": [ "Current" ], "labels": [ "Current" ] } }, "measures": { "preview-series-0": 31 } }, { "id": "[\"preview-category-2\",\"preview-series-1\"]", "dimensions": { "pivot:category": { "value": "Mar", "label": "Mar", "path": [ "Mar" ], "labels": [ "Mar" ] }, "pivot:series": { "value": "Previous", "label": "Previous", "path": [ "Previous" ], "labels": [ "Previous" ] } }, "measures": { "preview-series-1": 45 } }, { "id": "[\"preview-category-3\",\"preview-series-0\"]", "dimensions": { "pivot:category": { "value": "Apr", "label": "Apr", "path": [ "Apr" ], "labels": [ "Apr" ] }, "pivot:series": { "value": "Current", "label": "Current", "path": [ "Current" ], "labels": [ "Current" ] } }, "measures": { "preview-series-0": 62 } }, { "id": "[\"preview-category-3\",\"preview-series-1\"]", "dimensions": { "pivot:category": { "value": "Apr", "label": "Apr", "path": [ "Apr" ], "labels": [ "Apr" ] }, "pivot:series": { "value": "Previous", "label": "Previous", "path": [ "Previous" ], "labels": [ "Previous" ] } }, "measures": { "preview-series-1": 50 } } ], "matrixCells": [ { "categoryId": "preview-category-0", "seriesId": "preview-series-0", "observationId": "[\"preview-category-0\",\"preview-series-0\"]", "measureFieldId": "preview-series-0" }, { "categoryId": "preview-category-0", "seriesId": "preview-series-1", "observationId": "[\"preview-category-0\",\"preview-series-1\"]", "measureFieldId": "preview-series-1" }, { "categoryId": "preview-category-1", "seriesId": "preview-series-0", "observationId": "[\"preview-category-1\",\"preview-series-0\"]", "measureFieldId": "preview-series-0" }, { "categoryId": "preview-category-1", "seriesId": "preview-series-1", "observationId": "[\"preview-category-1\",\"preview-series-1\"]", "measureFieldId": "preview-series-1" }, { "categoryId": "preview-category-2", "seriesId": "preview-series-0", "observationId": "[\"preview-category-2\",\"preview-series-0\"]", "measureFieldId": "preview-series-0" }, { "categoryId": "preview-category-2", "seriesId": "preview-series-1", "observationId": "[\"preview-category-2\",\"preview-series-1\"]", "measureFieldId": "preview-series-1" }, { "categoryId": "preview-category-3", "seriesId": "preview-series-0", "observationId": "[\"preview-category-3\",\"preview-series-0\"]", "measureFieldId": "preview-series-0" }, { "categoryId": "preview-category-3", "seriesId": "preview-series-1", "observationId": "[\"preview-category-3\",\"preview-series-1\"]", "measureFieldId": "preview-series-1" } ] } }, "bindings": {}, "presentation": { "dataLabels": false }});
// When the host unmounts:// chart.destroy();Await updates before reading a snapshot or exporting. Call chart.destroy() when the host unmounts. See the live catalog to interact with this type.
Supported options
Section titled “Supported options”Set these fields in chartOptions. The option schema validates supported keys, ranges and choices; updating chartOptions replaces that authored object.
| Option | Default | Accepted values |
|---|---|---|
showGridLines | true | true or false |
markOpacity | 1 | 0.2 to 1; step 0.05 |
strokeWidth | 2 | 1 to 6; step 0.5 |
Titles, legends, theme and labels belong to presentation or the corresponding top-level setting. Axis, color, navigation and interaction support depends on the selected chart; see Data & Configuration.
Related charts
Section titled “Related charts”- Line — Show change and trends across an ordered axis.
- Smooth line — Show trends with a smooth curve through each value.
- Small multiples — Compare series in aligned panels with independent scales.
- Annotated time series — Highlight notable points along an ordered time trend.