In this case, I have used the changeset insert() method with new tuples, and the remove() method with vega.truthy; things work as I expect. However, in another case, I used remove() with the existing tuple; it does not work.
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December 13, 2018 23:42
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vega-view changeset works as expected
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| license: mit | |
| height: 500 | |
| scrolling: yes | |
| border: yes | |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <!-- uploaded using vegawidget --> | |
| <script src="https://cdn.jsdelivr.net/npm/vega@4"></script> | |
| <script src="https://cdn.jsdelivr.net/npm/vega-lite@3.0.0-rc10"></script> | |
| <script src="https://cdn.jsdelivr.net/npm/vega-embed@3"></script> | |
| </head> | |
| <body> | |
| <div id="chart"></div> | |
| <script type="text/javascript"> | |
| const spec = "spec.json"; | |
| const opt = {"defaultStyle":true,"renderer":"canvas"}; | |
| vegaEmbed('#chart', spec, opt).then(result => { | |
| // access view as result.view | |
| let changeset = vega.changeset() | |
| .insert([{a: "b", b: 2}, {a: "c", b: 3}]) | |
| .remove(vega.truthy); | |
| result.view.change("source", changeset).run(); | |
| }).catch(console.error); | |
| </script> | |
| </body> | |
| </html> |
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| { | |
| "$schema": "https://vega.github.io/schema/vega-lite/v2.json", | |
| "datasets": { | |
| "source": [ | |
| { | |
| "a": "a", | |
| "b": 1 | |
| } | |
| ] | |
| }, | |
| "data": { | |
| "name": "source" | |
| }, | |
| "mark": "bar", | |
| "encoding": { | |
| "x": { | |
| "field": "a", | |
| "type": "ordinal" | |
| }, | |
| "y": { | |
| "field": "b", | |
| "type": "quantitative" | |
| } | |
| } | |
| } |
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