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Bokeh hover date. plotting import figure from bokeh.
- Bokeh hover date. We can hide the desirable glyph by simply clicking on an entry in a legend. This example displays a hoverful scatter plot of random data points showing how the hover widget works. For example, the time is “23:04:12”, I would see some random number having value “5. (default: None) x_axis_label (Nullable (TextLike)): A label for the x-axis. These modes are activated by setting the click_policy property on a Legend to either "hide" or "mute". to_pydatetime (), top=data_df Jun 1, 2020 · This question seems to address my exact question, but I do not see how the answer relates to the actual custom html: bokeh hover tool - format date variable in custom html The data is passed to bokeh as a pandas data frame then use ColumnDataSource within Bokeh. ColumnDataSource, :class:``,, Keywords, hover Jul 23, 2025 · Adding tooltips to a timeseries chart in Bokeh is a straightforward process that can greatly enhance the interactivity and usability of your visualizations. . I have not been able to make the 2nd figure pop up when a point is hovered over, so I’ve made it part of th… Configuring plot tools ¶ Bokeh comes with a number of interactive tools that you can use to report information, to change plot parameters such as zoom level or range extents, or to add, edit, or delete glyphs. models. Kindly run the “Test. vbar (x=data_df ['date']. plotting import figure, show, Mar 1, 2016 · The tool tip does not show the date in the correct format in the line chart. S. Adding jitter # To avoid overlap between numerous scatter points for a single category, use the jitter() function to give each point a random offset. Apr 16, 2018 · Hi, I create a hover tool like so: hover = HoverTool(names=[‘a’,‘b’,‘c’]) hover. plotting import show, figure from bokeh. Dec 9, 2019 · I'm trying to format my tool tip to Month Year format but it doesn't seems to work? Here's my code: import numpy as np # linear algebra import pandas as pd from bokeh. It supports various types of data, including datetime, which allows you to create plots with time-based axes. import numpy as np from bokeh. My issue came when I tried to add a hover that shows the concrete value at some point of the plot. Inste Sep 24, 2014 · hover. datetime64) source = ColumnDataSource(data={ 'date' : datetime(AAPL['date'][::10]), 'adj close' : AAPL['adj_close'][::10], 'volume' : AAPL['volume Since this answer was originally posted, new work has gone into Bokeh to make things simpler. I found some answers to this problem, but unfortunately I can't adapt it to my Mar 8, 2021 · The hover needs to stay so that users can click on it (and may be select/copy stuff) Im rendering bokeh json from client side using Bokehe. Screen Shot 2020-12-14 at 7. io import output_file, show, output_notebook figure creating library from bokeh. 6. The types of gesture tools are: Pan/Drag tools Click/Tap tools Aug 9, 2022 · I am new with Bokeh and try to make data in the tooltips clickable hyperlink to a website. It allows users to create ready-to-use appealing plots Bokeh comes with a number of interactive tools that you can use to report information, to change plot parameters such as zoom level or range extents, or to add, edit, or delete glyphs. formatters = {'Time': "datetime"} hover. By integrating hover tools, you enhance the practical approach to time series visualization, making it easier for users to interact with and understand complex data sets. from bokeh. I set hover_on_line_alpha=1. Below i have given my code, kindly point out me where i am going wrong? from bokeh. I am plotting multiple lines on the same plot using the below: from bokeh. sx, sy Im plotting a heatmap Jun 25, 2025 · This demo demonstrates how to build custom hover tooltips using HTML. By default the tool will display information for all the dimensions specified on the element: Nov 23, 2015 · I'm using bokeh with an ipython notebook. embed. plotting import figure import numpy as np x =np. random. But I import numpy as np from bokeh. Maybe someone can help? 1. Mar 8, 2024 · Method 2: Adding Hover Tool for Interactive Data Display To enhance the functionality of our candlestick plot, Bokeh’s Hover Tool can be integrated to display additional information such as date and exact price values when hovering over a candlestick. layouts import column, row from bokeh. 12 bokeh 3. io import show, output_file, curdoc from bokeh. Tools can be Link two Bokeh model properties using JavaScript. How can I add? from math import pi import pandas as pd import numpy as np Load bokeh modules functions for creating outputs from bokeh. models import DataRange1d from bokeh Hover tool does not currently work with the following glyphs: . Tools can be Jul 29, 2016 · This shows me the time-series, with date-formatting on the x-axis and y-axis values that look like “ 200,000”, “$250,000”, etc. geometry. The x-axis of the plot has Timestamp values which are converted into ep import numpy as np from bokeh. If no hover tool is specified in the tools argument, then passing tooltips here will cause one to be created and added. This method elevates the interactivity of the plot, making it more informative and user Bokeh comes with a number of interactive tools that you can use to report information, to change plot parameters such as zoom level or range extents, or to add, edit, or delete glyphs. "date") and the reason for this is a label may correspond to several fields or special variables, and it may be desired to format all of them independently. I am new to Bokeh and I am trying to apply hover tool tips over the plot. datetime64) source = ColumnDataSource(data={ 'date' : datetime Bokeh comes with a number of interactive tools that you can use to report information, to change plot parameters such as zoom level or range extents, or to add, edit, or delete glyphs. Here is my code: This is the code for the data collection: import cv2 as cv from datetime import Apr 10, 2017 · That is because there seems to be an internal mechanism which produces an additonal column of the date string in the source and overwrites the tooltip (see holoviews. Details Bokeh APIs, figure. Is this a bug? Jun 20, 2023 · Hello all, Im trying to generate multiline chart with cycles in the points (example only with 2 lines) and let bokeh display multiple information from ColumnDataSource , but unfortuna telly Im not able to let display cycle “y Coordinates” for each line separatelly. Create informative and dynamic data visualizations with custom tooltips. attr Feb 24, 2022 · To quickly analyze the data in my charts, I need to see all the values of a multi-line chart at once. Also: in the future, please make sure to take "how do I" support-type questions to the Discourse, not the issue tracker: A rendering of the 2014 monthly calendar. plotting import figure, show from bokeh. In this blog, we will explore how to handle categorical data with Bokeh and provide some examples to illustrate the concepts. arange(1000) y =np. Unfortunately, I can’t get this to work with JavaScript. May 22, 2018 · I am trying to visualise this using Bokeh which I’ve managed to do successfully, however when implementing the hover-tool, it returns the number divided specifically by 2. 2. Example Configuring plot tools ¶ Bokeh comes with a number of interactive tools that you can use to report information, to change plot parameters such as zoom level or range extents, or to add, edit, or delete glyphs. stocks import AAPL output_file("tools_hover_tooltip_formatting. For more information about configuring a tooltip on a plot with the HoverTool, see the Basic Tooltips section for more information. models import ColumnDataSource, HoverTool from bokeh. What is Python Bokeh? Python Bokeh is a data visualization tool or we can also say Python Bokeh is used to plot various types of graphs May 3, 2016 · Hi, I'm making a 2D scatter plot in which every point corresponds to an image in a dataset. sampledata. To add a hover tool to a scatter plot in Bokeh, we need to create a HoverTool object and add it to the plot's tools list. Today we are going to see some Python Bokeh Examples. tooltips = tooltips My y-axis is in datetime format. Timeseries plots # Units # Bokeh can automatically handle many kinds of datetime types, for instance Numpy datetime arrays and Pandas datetime series, as well as Python built-in datetime types. dt. Internally, all datetime values are floating point values that represent milliseconds-since-epoch (specifically, “epoch Jun 28, 2017 · Hello, I want to use the datetime formatting for the hovertool, but I’m not sure how to get it working. element. Unless that's changed by now, then please let me know. The hover tool is available and active in the tool list but I can’t get any tooltip to show. Bokeh version: latest Python: 3. Jun 9, 2021 · I am trying to plot stock data. palettes import Greens as palette # from bokeh. mode=‘vline’ hover. g. from ~40 Meg to ~13 Meg However, I need ms accuracy in the final output, I can deal First steps 4: Customizing your plot # In the previous first steps guides, you generated different glyphs and added more information such as a title, legend, and annotations. To enable the hover tool, simply supply 'hover' as a list to the tools plot option. I can restrict names to contain only line ‘a’, but then if I hide line ‘a’ by clicking on the legend, none of the Link two Bokeh model properties using JavaScript. Donations help pay for cloud hosting costs, travel, and other project needs. Tools can be grouped into four basic categories: Gestures These tools respond to single gestures, such as a pan movement. I have a plot with beautifully formatted datetime on the x axis, but in the Hovertool the timestamp just comes up as a unix Epoch tim… Apr 18, 2021 · Generic helper class Generating a plot with bokeh involves quite a bit of boilerplate code which we likely want to re-use between plots: Instantiating the figure object with a datetime axis type Adding tooltips with HoverTool Formatting the date labels on the x-axis Let’s create a helper class that handles all of this for us. Jun 30, 2020 · One option is to use separate hover tools with left/right attachments for the two lines or above/below attachments for the two lines (if you know something about their vertical relationships relative to one another). 07. Handling Categorical Data with Bokeh In [ ]: from bokeh. Jan 2, 2025 · Learn how to enhance your Bokeh plots with interactive hover tooltips using HoverTool (). bokeh. stocks import AAPL def datetime(x): return np. it display only values of x-axis, for y-axis value it show “???”. Declare data # Apr 13, 2024 · Python Bokeh is one of the best Python packages for data visualization. hlist:: :columns: 3 * annulus * arc * bezier * image_url * oval * patch * quadratic * ray * step * text . io import show, output_notebook from bokeh. This in bokeh 3. select(dict(type=HoverTool)) hover. attr import numpy as np from bokeh. Categorical plots # Scatters # Sometimes there are many values associated with each category. So far I am adding and formatting my hovertool like this: #add hovertool tooltips = [ ('Time', '@height') ] hover = bar. In this case, you can visualize your data using a categorical scatter plot. ( the image below). _postprocess_hover). This auto-ranging is performed by the DataRange1d models that are the default values for a plot’s x_range and y_range properties. I have implemented a lot of fixes and I think what I have here should work. Jul 18, 2025 · Output Tooltip Hover Example 6: Highlighting Data using the Legend We have plotted a line graph with 'Date' as the x-axis and 'Close' as the y-axis. Is it possible to make a HoverTool display the image (preferably colormapped)? Thanks! Juan. In this section, you will customize the appearance of the plot as a whole. 0 but when I hover the alpha doesn’t change too. I was able to get the Bokeh hover tool working but, I am not able to pull and display the data. Interactive legends # Legends added to Bokeh plots can be made interactive so that clicking or tapping on the legend entries will hide or mute the corresponding glyph in a plot. The tooltips are displayed when the user hovers over a point in the plot. This should be supported and I have tried to obtain the intended behaviour in Aug 29, 2025 · Bokeh specific options for adding hover tools as well as other interactive tools like tap tool and box select tool: Bokeh is a fiscally sponsored project of NumFOCUS, a nonprofit dedicated to supporting the open-source scientific computing community. The x axis is a time axis. I dont know how to apply formatters to the default hover tool or how to make the custom hover work in top of datashader object. It’s pretty typical last mile issue with holoviews: when you get your plot defined properly up to 95% but the last 5% makes you drop it and move to native bokeh, matplotlib struggling. It covers various aspects such as adding hover tools, sliders, and dropdown menus to enhance the interactivity of the visualizations. models import HoverTool df Bokeh Multi-line with hover I have pandas dataframe which looks like this How do I convert this to columnDataSource ? How do I create a multi-line graph in bokeh with hover tool. plotting import curdoc, figure, show from bokeh. Actions. Aug 3, 2021 · Currently the Bokeh hovertool spits out my date values as a 13-digit number. A hover tooltip displays the US holidays on the significant dates. palettes import YlOrRd as palette # from bokeh. A & B are two data frames. plotting import figure, output_file, show Interactivity tools from bokeh. Sketched very broadly: Add a JS callback to x-range updates that computes the appropriate y-min and -max based on the current x-range extents import numpy as np from bokeh. But the Hovertool still shows my time as Bokeh comes with a number of interactive tools that you can use to report information, to change plot parameters such as zoom level or range extents, or to add, edit, or delete glyphs. Learn this easy visualization tool and add it to your Python stack. : HoverTool(tooltips=[('label', '@datetime{%F}')], formatters={'datetime': 'datetime'}) It is no longer necessary to pre-format date fields in the data source as below (although it certainly Aug 9, 2022 · formating datetime in bokeh hover tool Asked 2 years, 6 months ago Modified 2 years, 6 months ago Viewed 87 times Feb 16, 2016 · Hi Can anyone please please tell me how to get a nice date time format in Hovertool. : HoverTool(tooltips=[('date', '@date_col{%F}')], formatters={'date_col': 'datetime'}) It is no longer necessary to pre-format date fields in the data source as below. models import CategoricalColorMapper, ColumnDataSource, FactorRange from bokeh. It’s most useful examples of interactivity include hover tools and the ability to instantly select Jun 4, 2019 · Hover tool is not working properly on vbar graphs. Mar 15, 2020 · This post provides a detailed guide on how to create interactive data visualizations using Bokeh in Python. random(100 Jul 27, 2018 · In this lesson you will learn how to visually explore and present data in Python by using the Bokeh and Pandas libraries. For example, a series of measurements on different days of the week. Scroll/Pinch. There are several plots in a page, so I need to get absolute page coordinates from cb_data. A datetime field can be formatted as a datetime directly by the hover tool, by specifying a formatter, e. 8373e7”. Thanks ! A rendering of the 2014 monthly calendar. array(x, dtype=np. I found OpenURL example, but this one is only for tapping a point on the map. X-axis as the date Imports: Here's the data as yo Sep 23, 2014 · It would be nice to make it easy to create a "hover" tooltip template that could do some simple conversions/formatting on "standard" data point information: x, y, size, color, etc. 2 Feb 3, 2017 · Bokeh Hover Tool, tooltips argument: issues with date and time format Asked 8 years, 5 months ago Modified 8 years, 4 months ago Viewed 600 times import numpy as np from bokeh. Jan 21, 2022 · Python: Bokeh hover date time python, bokeh asked by Yasir Azeem on 01:34PM - 29 Dec 16 UTC Bokeh comes with a number of interactive tools. May 14, 2018 · As for now I see Bokeh supports HoverTool for multi_line glyph. tooltips = [ (“date”, ‘@date’) (“a”,"@a") (“b”,"@b") (“c”,"@c") ] Now what I would like is to have one and only one box show up at a time. datetime64) source = ColumnDataSource(data={ 'date' : datetime(AAPL['date'][::10]), 'adj close' : AAPL['adj_close'][::10], 'volume' : AAPL['volume Jul 23, 2025 · Bokeh is designed to create interactive and visually appealing plots that can be easily integrated into web applications. In the example below, I would like to make the name of the period and capital clickable, so that a click opens a new tab in the browser to show a Wikipedia webpage. tooltip convenience function for 'datetime' info · Issue #1239 · bokeh/bokeh · GitHub Also, I am in the process of improving selections/inspections in a new PR selection manager and tools/events refactor by bryevdv · Pull Request #1244 · bokeh/bokeh · GitHub Models for controlling the text and visual formatting of tick labels on Bokeh plot axes. ipynb” code with the example “Dummy. The Mar 26, 2021 · Hi, I want to add hover to my candlestick. This prevents me from having to have both the raw date time object for the X axis and a human readable formatted string for hover tool in my column data source, and makes a huge difference to my final file size. D Apr 19, 2025 · I’m (still) working away at figuring out how to update a 2nd figure from a hover callback. Windowed auto-ranging # Sometimes, you may want auto-ranging on one axis to be be based P. Hover tools # Some Elements allow revealing additional data by hovering over the data. plotting import figure from bokeh. Dec 29, 2016 · I am trying to get a line plot via Bokeh in Python. So if you are asking about viewport-aware auto-ranging then you will need to roll a solution of your own. Inspectors. plotting import figure output_notebook() Jan 16, 2020 · in a bokeh server. I would like to see an example of how these values can be formatted. 3. It can sometimes be helpful to understand how Bokeh represents these values. I want to show a Apr 12, 2020 · The goal was to have my mouse hover over the candlesticks and have the data appear while I do so. ohlc without missing-date gaps wanted to fix Hover (add Date in the right format, and add Volume info) packages: python 3. For more information see Dec 30, 2024 · Learn how to enhance your data visualizations by customizing hover tools in Bokeh, with practical guides and industry examples. datetime64) source = ColumnDataSource(data={ 'date' : datetime(AAPL['date'][::10]), 'adj close' : AAPL['adj_close'][::10], 'volume' : AAPL['volume Sep 13, 2017 · I have a Date Range Slider widget hooked up to change the x-axis date range to 7 days. Using Themes # With Bokeh’s themes, you can Use the hover tool in case you want to display tooltips on hover over certain areas of a plot. csv”, both given Sep 13, 2021 · Bokeh is a Python library for creating interactive visualizations for modern web browsers including Jupyter Notebook and Refinitiv CodeBook. svg :height: 24px :alt: Icon of a popup tooltip with abstract lines of text representing the hover tool in the toolbar Dec 14, 2020 · if you hover over the lines the year is shown in scientific notation. Parameters: attr (str) – The name of a Bokeh property on this model other (Model) – A Bokeh model to link to self. Sep 24, 2014 · Although it is not a grey solution, a current workaround until that feature is implemented, is to add a new column to the data source with the dates pre formatted and display that in the hover tool. I have also provided the Python Bokeh project source code GitHub. This includes resizing your plot, changing its lines and colors, and customizing the axes and tools. plotting import figure, show TOOLS="crosshair,pan,wheel_zoom,box_zoom,reset,hover,save" TOOLTIPS = [ ("index", "$index Dec 9, 2023 · I have an simple example, run in jupyter notebook: hvplot. Jul 23, 2025 · Adding a Hover Tool to a Scatter Plot The hover tool allows users to see additional information about the data points on a plot by hovering their mouse over the point. legend. This tool uses Bokeh’s generic tooltip object behind the scenes, but contains many additional, topics features. It’s also a challenge with the hover tool. import itertools import numpy as np from bokeh. io import output_file, show from bokeh. But the problem is that if I want to display particular value for point - it shows all the list of values instead of it. Bokeh provides a feature to do so by setting the legend click_policy property to Feb 26, 2024 · Hi there I just got the plot I wanted with some help and tweaks here and there using bokeh; however, I can't figure out how to add information of interest to my tooltips navigation/hover tool. io Apr 25, 2024 · Whenever I plot any graph having the time in the “hh:mm:ss” format and use hover tool for seeing the timestamp in the same format at any point in the plot, I see a decimal number having an exponential degree. Jul 19, 2015 · Is it possible to add Tooltips to a Timeseries chart? In the simplified code example below, I want to see a single column name ('a','b' or 'c') when the mouse hovers over the relevant line. This example demonstrates the usage of plotting several plots together using gridplot. For the first three comprise the category of gestu Apr 17, 2019 · I have datetime on x-axis and I was trying to plot it as a datetime, but apparently, according to this Bokeh can only have number axes. I want to plot a line graph in bokeh using a pandas DataFrame containing datetimes: import pandas as pd from datetime import datetime as dt from bokeh. 59 AM1972×1434 185 KB 1 Like ea42gh December 14, 2020, 2:32pm 2 Aug 24, 2016 · Like the title says I have data I want to display in my hover for both violin and stacked bar charts. datetime64) source = ColumnDataSource(data={ 'date' : datetime Jan 22, 2025 · @songdg The built-in DataRange1d option always auto-ranges over the entire dataset, regardless of what happens to be just in the current viewport. 11 from bokeh. I have two questions about HoverTool behavior: Oct 25, 2020 · Bokeh: X-axis Date format and Candle Stick graph Hover Date issues Asked 4 years, 6 months ago Modified 4 years, 6 months ago Viewed 2k times Apr 28, 2020 · In the other side when I add the default ‘hover’ (tools=['hover]) to the tools I actually see the values but the Date appears as a number. There are five types of tool interactions: Pan/Drag. Tools can be Dec 29, 2024 · This code snippet demonstrates adding a hover tool that displays the date, value, and status when you hover over a data point in the plot. circle, bokeh. |hover_icon| image:: /_images/icons/hover. Jul 18, 2018 · I want to create a multiline Bokeh plot with datetime axis and a hover tool that shows the datetime of the data point. With the hover line segments working, if I use the slider to change to a 7 day view and then hover the mouse back over the plot, the x-range snaps back to the original 24-hr date range. palettes import Cividis as palette If a hover tool is specified in the tools argument, this value will override that hover tools tooltips value. Click/Tap. models import (ColumnDataSource, ColorBar, LinearColorMapper, HoverTool, BoxAnnotation, Label, Range1d, Title, Span) from bokeh. try: One hovertool for each line in the Jul 23, 2025 · One way to visualize and analyze categorical data is through the use of Bokeh, a powerful Python library for creating interactive visualizations. While I know bokeh doesn’t support showing data other than the x or y axis innately, I came across a solution for this… Ranges and axes # Axis Ranges # Default auto-ranging # By default, Bokeh attempts to automatically set the data bounds of plots to fit snugly around all the data available. My first idea (and preferred solution) was to display the values of the current cursor position (vline) next to the labels. This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value. plotting. The types of gesture tools are: Pan/Drag tools Click/Tap tools Use the hover tool in case you want to display tooltips on hover over certain areas of a plot. datetime64) source = ColumnDataSource(data={ 'date' : datetime(AAPL['date'][::10]), 'adj close' : AAPL['adj_close'][::10], 'volume' : AAPL['volume Jul 4, 2022 · I can not get the Hover tool in Bokeh to display the Date and Time correctly, I get ???, I understand this to mean that the Hover cannot read the column in my Dataframe. This action is a result of adding the code for linked line segments. By following the steps outlined in this article, you can create informative and engaging plots that allow users to explore data in more depth. How do I change the format of how it's displayed? Below is my codealso I've specified which line of code the date/tim May 12, 2022 · My code for the bokeh HoverTool is the following: p = figure ( plot_height=250, x_axis_type='datetime', ) p. Tools can be Feb 1, 2016 · Since this answer was originally posted, new work has gone into Bokeh to make things simpler. Current code looks like below and I would like to make Capital Feb 15, 2019 · It is not the label from the hover tooltip (e. click_policy to "hide" in order to hide the desirable glyph. Further, we have set p. D May 10, 2021 · I try to make a dashboard with bokeh but my hover tool got broken, since I tried to plot the data in a single diagram. However the data was displayed in the correct format in the table below. datetime64) source = ColumnDataSource(data={ 'date' : datetime Feb 3, 2020 · The true value of Bokeh belongs to its interactivity, and the simplicity of its documentation. X - axis has date values and Y - axis has a numeric value. models import ColumnDataSource, FactorRange from bokeh. Generate data Nov 13, 2018 · I am using the formatter option of hover tools to display a datetime object in a formatted string. (default: ‘’) Apr 9, 2020 · I would like to create a categorial scatter plot with these functions using bokeh: Hover Tooltips Legend outside the plot area with click policy = "hide" After numerous searches, I can implement the Aug 21, 2018 · I'm trying to plot some values respect to the time using a line plot with Bokeh. html") def datetime(x): return np. Concepts: Jan 21, 2025 · Hi, A heatmap calendar in Bokeh 😍. e1 s1jk wfb bxuiz q2oce as ztr 13rld ixln ifn