Support converting a Chart to a Vega editor URL

altair/vegalite/v5/api.py

@@ -1055,6 +1055,27 @@ def to_html(
             requirejs=requirejs,
         )
 
+    def to_url(self, fullscreen: bool = False):
+        """Convert a chart to a URL that opens the chart specification in the Vega chart editor
+
+        Convert a chart to a sharable URL that opens the chart in the online Vega chart editor.
+        The chart specification (including any inline data) is encoded in the URL.
+
+        This method requires the option vl-convert-python dependency
+
+        Parameters
+        ----------
+        fullscreen : bool
+            If True, editor will open chart in fullscreen mode. Default False
+        """
+        from ...utils._importers import import_vl_convert
+
+        vlc = import_vl_convert()
+        if _using_vegafusion():
+            return vlc.vega_to_url(self.to_dict(format="vega"), fullscreen=fullscreen)
+        else:
+            return vlc.vegalite_to_url(self.to_dict(), fullscreen=fullscreen)
+
     def save(
         self,
         fp: Union[str, IO],

doc/releases/changes.rst

@@ -8,6 +8,8 @@ Version 5.2.0 (unreleased month date, year)
 
 Enhancements
 ~~~~~~~~~~~~
+- Support saving charts as PDF files using the vl-convert export engine (#3244)
+- Support converting charts to sharable Vega editor URLs with ``chart.to_url()`` (#3252)
 
 Bug Fixes
 ~~~~~~~~~

doc/user_guide/saving_charts.rst

@@ -224,6 +224,26 @@ size at the default resolution of 72 ppi::
 
     chart.save('chart.png', scale_factor=2)
 
+Sharable URL
+~~~~~~~~~~~~
+The :meth:`Chart.to_url` method can be used to build a sharable URL that opens the chart
+specification in the online Vega editor_.
+
+.. altair-plot::
+    :output: repr
+
+    import altair as alt
+    from vega_datasets import data
+
+    chart = alt.Chart(data.cars.url).mark_point().encode(
+        x='Horsepower:Q',
+        y='Miles_per_Gallon:Q',
+        color='Origin:N'
+    )
+
+    chart.to_url()
+
 .. _vl-convert: https://github.com/vega/vl-convert
 .. _altair_saver: http://github.com/altair-viz/altair_saver/
 .. _vegaEmbed: https://github.com/vega/vega-embed
+.. _editor: https://vega.github.io/editor/

tests/vegalite/v5/test_api.py

@@ -380,6 +380,30 @@ def test_save_html(basic_chart, inline):
         assert 'src="https://cdn.jsdelivr.net/npm/vega-embed@6' in content
 
 
+def test_to_url(basic_chart):
+    share_url = basic_chart.to_url()
+    expected_vegalite_encoding = (
+        "N4Igxg9gdgZglgcxALlANzgUwO4tJKAFzigFcJSBnAd"
+        "TgBNCALFAZgAY2AacaYsiygAlMiRoVYcAvpO50AhoTl4QUOQFtMKEPMUBaMACY5LTAA4AnACM55ugFY6ARgBspgOz"
+        "2zh03Wfs5bCwsIDIganIATgDWyoQAngAOmsgg1hEh3JhQkHQkSKggAB7K8JgANnRaStzxSVpQEGokcmUZIHElWBVa"
+        "liA1ickgAI6kckRwisRomtLcACSUYIyY4VpihAmUyAD029MIcgB0CBOMpJaHcBDbi8vhe5gHumUTmHt2h44ALJ+HA"
+        "FaUaB9bQKOSUTCESjKHRyfRGEwWay2BwudyeUzeXz+QLBZAAbVAShSAEFgb1kAZTDJCVoAEJklB2OzUkBEkAAYQZy"
+        "C+LBZbIAIlzzI4+VoAKJc0wizg0lIAMS5dl5MtZWgA4lzHOZRSlBJK3DqQABJRUGSQAXWkQA"
+    )
+
+    assert (
+        share_url
+        == f"https://vega.github.io/editor/#/url/vega-lite/{expected_vegalite_encoding}"
+    )
+
+    # Check fullscreen
+    fullscreen_share_url = basic_chart.to_url(fullscreen=True)
+    assert (
+        fullscreen_share_url
+        == f"https://vega.github.io/editor/#/url/vega-lite/{expected_vegalite_encoding}/view"
+    )
+
+
 def test_facet_basic():
     # wrapped facet
     chart1 = (