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Add initial timestamp parameter to TimeSliderChoropleth #1435

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merged 6 commits into from
Nov 10, 2022
Merged

Add initial timestamp parameter to TimeSliderChoropleth #1435

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29c3892
added optional inital position
jjbenes Jan 11, 2021
c0a2513
Update time_slider_choropleth.py
jjbenes Jan 15, 2021
3c2b969
Update folium/plugins/time_slider_choropleth.py
jjbenes Apr 26, 2021
6bd85d5
fix implementation
Conengmo Nov 10, 2022
da5eeef
Add entry to example notebook
Conengmo Nov 10, 2022
56fb920
Merge remote-tracking branch 'upstream/main' into pr/1435
Conengmo Nov 10, 2022
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18 changes: 13 additions & 5 deletions folium/plugins/time_slider_choropleth.py
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Original file line number Diff line number Diff line change
Expand Up @@ -26,21 +26,25 @@ class TimeSliderChoropleth(JSCSSMixin, Layer):
Whether the Layer will be included in LayerControls.
show: bool, default True
Whether the layer will be shown on opening (only for overlays).

init_timestamp: int, default 0
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Initial time-stamp index on the slider. Must be in the range
`[-L, L-1]`, where `L` is the maximum number of time stamps in
`styledict`. For example, use `-1` to initialize the slider to the
latest timestamp.
"""
_template = Template(u"""
{% macro script(this, kwargs) %}
var timestamps = {{ this.timestamps|tojson }};
var styledict = {{ this.styledict|tojson }};
var current_timestamp = timestamps[0];

var current_timestamp = timestamps[
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(timestamps.length+{{ this.init_timestamp}}) % timestamps.length];
// insert time slider
d3.select("body").insert("p", ":first-child").append("input")
.attr("type", "range")
.attr("width", "100px")
.attr("min", 0)
.attr("max", timestamps.length - 1)
.attr("value", 0)
.attr("value", current_timestamp)
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.attr("id", "slider")
.attr("step", "1")
.style('align', 'center');
Expand Down Expand Up @@ -137,7 +141,7 @@ class TimeSliderChoropleth(JSCSSMixin, Layer):
]

def __init__(self, data, styledict, name=None, overlay=True, control=True,
show=True):
show=True, init_timestamp=0):
super(TimeSliderChoropleth, self).__init__(name=name, overlay=overlay,
control=control, show=show)
self.data = GeoJson.process_data(GeoJson({}), data)
Expand All @@ -156,3 +160,7 @@ def __init__(self, data, styledict, name=None, overlay=True, control=True,

self.timestamps = timestamps
self.styledict = styledict
assert -len(timestamps) <= init_timestamp < len(timestamps), (
'init_timestamp must be in the range [-{}, {}) but got {}'.format(
len(timestamps), len(timestamps), init_timestamp))
self.init_timestamp = init_timestamp