# \#question **URL:** https://community.plotly.com/tag/question/8.md [Latest](https://community.plotly.com/latest.md) · [Categories](https://community.plotly.com/categories.md) · [Tags](https://community.plotly.com/tags.md) --- ## [Dash DMC RadarChart Custom Tick Headers](https://community.plotly.com/t/dash-dmc-radarchart-custom-tick-headers/97850)
**Author:** [@Polly\_Ruhnke](https://community.plotly.com/u/Polly_Ruhnke)\ **Replies:** 7\ **Last updated:** [October 22, 2026, 6:36pm UTC](https://community.plotly.com/t/dash-dmc-radarchart-custom-tick-headers/97850 "2026-10-22T18:36:22Z")
I have DMC and Dash. I have been using the new RadarChart, and, for a specific usecase, I need to reate a custom Tick header for each category; and, for some reason, this Javascript function is just not registering, no m… --- ## [\`hoverlabel\_align="right",\` is not honored in \`hovermode="x unified"\`](https://community.plotly.com/t/hoverlabel-align-right-is-not-honored-in-hovermode-x-unified/97717)
**Author:** [@stdedos](https://community.plotly.com/u/stdedos)\ **Replies:** 8\ **Last updated:** [October 5, 2026, 6:08pm UTC](https://community.plotly.com/t/hoverlabel-align-right-is-not-honored-in-hovermode-x-unified/97717 "2026-10-05T18:08:46Z")
I have a hovermode="x unified" stacked bar graph (with a second y-axis scatter-plot with a connecting line if it makes a difference). Because the graph renders numbers, I would like to align them all to right for easier… --- ## [Different behavior of a Dash app depending on the use of the embedded web server or of gunicorn](https://community.plotly.com/t/different-behavior-of-a-dash-app-depending-on-the-use-of-the-embedded-web-server-or-of-gunicorn/97763)
**Author:** [@jfh999](https://community.plotly.com/u/jfh999)\ **Replies:** 1\ **Last updated:** [October 1, 2026, 12:20am UTC](https://community.plotly.com/t/different-behavior-of-a-dash-app-depending-on-the-use-of-the-embedded-web-server-or-of-gunicorn/97763 "2026-10-01T00:20:32Z")
Hi, I am quite new to Dash. I work on a Raspberry Pi cm5 running Trixie to develop a motion detection camera and also have the possibility of live streaming the camera data. I use Dash 4.4.0 and Python 3.13.5. I also … --- ## [3D figure initially getting cut off at the bottom in browser environment](https://community.plotly.com/t/3d-figure-initially-getting-cut-off-at-the-bottom-in-browser-environment/97778)
**Author:** [@Wiodicazu](https://community.plotly.com/u/Wiodicazu)\ **Replies:** 2\ **Last updated:** [September 30, 2026, 10:34pm UTC](https://community.plotly.com/t/3d-figure-initially-getting-cut-off-at-the-bottom-in-browser-environment/97778 "2026-09-30T22:34:17Z")
plotly.py version: 7.1.0 I’m currently faced with the issue that every time when I try to generate a 3D plot with Plotly and display it in a browser environment, a part of the figure at the bottom is initially always cu… --- ## [Plotly chart becomes slow with a large dataset](https://community.plotly.com/t/plotly-chart-becomes-slow-with-a-large-dataset/97675)
**Author:** [@lilyhazel265](https://community.plotly.com/u/lilyhazel265)\ **Replies:** 2\ **Last updated:** [September 20, 2026, 10:24am UTC](https://community.plotly.com/t/plotly-chart-becomes-slow-with-a-large-dataset/97675 "2026-09-20T10:24:31Z")
Hi, I’m using Plotly to display a dataset with a lot of points, and the chart becomes noticeably slow when zooming or panning. Is there a recommended way to improve the performance, without reducing too much of the data? … --- ## [Is the Dash Framework in Trouble?](https://community.plotly.com/t/is-the-dash-framework-in-trouble/97531)
**Author:** [@PipInstallPython](https://community.plotly.com/u/PipInstallPython)\ **Replies:** 12\ **Last updated:** [September 18, 2026, 3:00pm UTC](https://community.plotly.com/t/is-the-dash-framework-in-trouble/97531 "2026-09-18T15:00:10Z")
I pulled that directly from the Discourse JSON API. New topics in the Dash Python category dropped from ~50/month in mid-2025 to ~11/month in mid-2026, and median views per new topic fell from ~140 to ~8… --- ## [dcc.Link Issue on my Website](https://community.plotly.com/t/dcc-link-issue-on-my-website/97054)
**Author:** [@akishira](https://community.plotly.com/u/akishira)\ **Replies:** 3\ **Last updated:** [September 6, 2026, 3:53pm UTC](https://community.plotly.com/t/dcc-link-issue-on-my-website/97054 "2026-09-06T15:53:48Z")
did anyone used dcc.Link refresh= False, and when you click something that will redirect to another page, it will scroll up first before changing the page? this is my recently hosted website: --- ## [Heroku Alternatives? Try Plotly Cloud](https://community.plotly.com/t/heroku-alternatives-try-plotly-cloud/67399)
**Author:** [@aestebanpl](https://community.plotly.com/u/aestebanpl)\ **Replies:** 8\ **Last updated:** [August 13, 2026, 7:33pm UTC](https://community.plotly.com/t/heroku-alternatives-try-plotly-cloud/67399 "2026-08-13T19:33:26Z")
Hi: Is there any heroku alternative to deploy dash apps in a free way ?. As we know Heroku free tiers will be deleted soon. As beginners we knew this famous tutorial Part 5. Publishing Your App | Dash for Python Docum… --- ## [dmc.DatePickerInput triggering callback when selecting first date but not the second](https://community.plotly.com/t/dmc-datepickerinput-triggering-callback-when-selecting-first-date-but-not-the-second/91493)
**Author:** [@bchurn](https://community.plotly.com/u/bchurn)\ **Replies:** 5\ **Last updated:** [August 3, 2026, 7:22pm UTC](https://community.plotly.com/t/dmc-datepickerinput-triggering-callback-when-selecting-first-date-but-not-the-second/91493 "2026-08-03T19:22:15Z")
Is there a way to prevent the dmc.DatePickerInput via dash-mantine-components from triggering callbacks upon selecting the first date but not the second? I am using the latest 1.1.0 build When using 0.12.1 I did not run… --- ## [Should I move backend logic out of Dash as the app scales?](https://community.plotly.com/t/should-i-move-backend-logic-out-of-dash-as-the-app-scales/97152)
**Author:** [@Marian\_Varga](https://community.plotly.com/u/Marian_Varga)\ **Replies:** 2\ **Last updated:** [June 19, 2026, 11:15am UTC](https://community.plotly.com/t/should-i-move-backend-logic-out-of-dash-as-the-app-scales/97152 "2026-06-19T11:15:36Z")
Hey everyone, I’m a big fan of Dash. I’ve been using it at our company to build an internal BI system, and honestly, it has ended up outperforming Power BI for our use case in pretty much every way — especially in terms… --- ## [Best option to build a plot like this](https://community.plotly.com/t/best-option-to-build-a-plot-like-this/97073)
**Author:** [@king\_o](https://community.plotly.com/u/king_o)\ **Replies:** 2\ **Last updated:** [June 12, 2026, 11:47am UTC](https://community.plotly.com/t/best-option-to-build-a-plot-like-this/97073 "2026-06-12T11:47:23Z")
Hi all, I’m new to using plotly and I’m looking to recreate a plot like this using plotly js. I’m curious to know if it’s possible with plotly and if so, what is the best option to build it? Thanks --- ## [Using variables instead of dates in Gantt Charts](https://community.plotly.com/t/using-variables-instead-of-dates-in-gantt-charts/97062)
**Author:** [@aupadhya](https://community.plotly.com/u/aupadhya)\ **Replies:** 1\ **Last updated:** [June 8, 2026, 7:35pm UTC](https://community.plotly.com/t/using-variables-instead-of-dates-in-gantt-charts/97062 "2026-06-08T19:35:56Z")
I want to assign a month as M0, and use notation like M1, M2, etc. on the Gantt chart and not rely on dates. How can I do it? --- ## [Does ds.read\_file() download the entire file into memory before returning, or does it return a handle that supports lazy row-group-level access](https://community.plotly.com/t/does-ds-read-file-download-the-entire-file-into-memory-before-returning-or-does-it-return-a-handle-that-supports-lazy-row-group-level-access/97071)
**Author:** [@insane](https://community.plotly.com/u/insane)\ **Replies:** 0\ **Last updated:** [June 5, 2026, 11:58am UTC](https://community.plotly.com/t/does-ds-read-file-download-the-entire-file-into-memory-before-returning-or-does-it-return-a-handle-that-supports-lazy-row-group-level-access/97071 "2026-06-05T11:58:23Z")
Hi, I’m experiencing Out of Memory (OOM) errors in my Dash Enterprise app when reading large Parquet files from an S3 data source. My current code looks like this: \*\*from dash\_enterprise\_libraries import data\_sources a… --- ## [Dash\_cytoscape with dcc.store, un-expected storage of position information](https://community.plotly.com/t/dash-cytoscape-with-dcc-store-un-expected-storage-of-position-information/97058)
**Author:** [@honky\_yau](https://community.plotly.com/u/honky_yau)\ **Replies:** 0\ **Last updated:** [June 3, 2026, 9:47am UTC](https://community.plotly.com/t/dash-cytoscape-with-dcc-store-un-expected-storage-of-position-information/97058 "2026-06-03T09:47:04Z")
I have using following code to conduct test, the interval callback will show the latest data of “stored-positions”. After the first time save cytoscape node position, the interval show the node latest location. However,… --- ## [On dbc/dcc components and inheritance](https://community.plotly.com/t/on-dbc-dcc-components-and-inheritance/97050)
**Author:** [@Zakary\_Bouchema](https://community.plotly.com/u/Zakary_Bouchema)\ **Replies:** 2\ **Last updated:** [June 3, 2026, 7:54am UTC](https://community.plotly.com/t/on-dbc-dcc-components-and-inheritance/97050 "2026-06-03T07:54:29Z")
Hello, I’m fairly new to Dahs Plotly but i’ve fallen into an issue that i’m not sure I can’t seem to answer by myself. The issue is the following, when should any of my component extend an already existing dbc dcc clas… --- ## [Issue with viewing pages when deployed with certain .py file names](https://community.plotly.com/t/issue-with-viewing-pages-when-deployed-with-certain-py-file-names/92057)
**Author:** [@jessieolough](https://community.plotly.com/u/jessieolough)\ **Replies:** 10\ **Last updated:** [May 26, 2026, 10:49am UTC](https://community.plotly.com/t/issue-with-viewing-pages-when-deployed-with-certain-py-file-names/92057 "2026-05-26T10:49:28Z")
Hi everyone, I have noticed an issue when deploying my multipage Dash app where sometimes a page will not be registered despite it being set up correctly. However, if I merely change the name of the page’s python script… --- ## [RangeSlider selection of a single value only works when sliding from the left](https://community.plotly.com/t/rangeslider-selection-of-a-single-value-only-works-when-sliding-from-the-left/96974)
**Author:** [@heartshime](https://community.plotly.com/u/heartshime)\ **Replies:** 4\ **Last updated:** [May 15, 2026, 3:58pm UTC](https://community.plotly.com/t/rangeslider-selection-of-a-single-value-only-works-when-sliding-from-the-left/96974 "2026-05-15T15:58:11Z")
If I want to select a single value on the range slider, it works when dragging the lower value to the same position as the higher value but not the other way around. This behaviour can even be observed on the examples p… --- ## [Ag-grid callback rowId returning index](https://community.plotly.com/t/ag-grid-callback-rowid-returning-index/96935)
**Author:** [@Winepr](https://community.plotly.com/u/Winepr)\ **Replies:** 1\ **Last updated:** [May 8, 2026, 1:40pm UTC](https://community.plotly.com/t/ag-grid-callback-rowid-returning-index/96935 "2026-05-08T13:40:13Z")
Hi, I have a ag-grid table and am trying to make a callback from the selected cell. I would like to return the information to another ag-grid, but with the colId and rowId information as the selection criteria. this is… --- ## [Inconsistent Dropdown focus behaviour in 4.0?](https://community.plotly.com/t/inconsistent-dropdown-focus-behaviour-in-4-0/96516)
**Author:** [@jlayt](https://community.plotly.com/u/jlayt)\ **Replies:** 4\ **Last updated:** [May 5, 2026, 8:26pm UTC](https://community.plotly.com/t/inconsistent-dropdown-focus-behaviour-in-4-0/96516 "2026-05-05T20:26:30Z")
We’ve been testing the 4.0 release and while it’s largely been seamless, we’ve hit a problem with the behaviour of the new dcc.Dropdown. We use dropdowns in both single-select and multi-select mode for filtering dataset… --- ## [Modebar (visually) breaks after first render (Blazor)](https://community.plotly.com/t/modebar-visually-breaks-after-first-render-blazor/96924)
**Author:** [@mklin](https://community.plotly.com/u/mklin)\ **Replies:** 1\ **Last updated:** [May 5, 2026, 2:30pm UTC](https://community.plotly.com/t/modebar-visually-breaks-after-first-render-blazor/96924 "2026-05-05T14:30:04Z")
Hi all, I have been painstakingly troubleshooting this issue all day. I’m not super familiar with the library, but I found it was a good fit for a 3D surface chart I needed to make (with some bar charts as well). I’ve s… --- ## [Venn diagram does not show text after callback call](https://community.plotly.com/t/venn-diagram-does-not-show-text-after-callback-call/64906)
**Author:** [@Melinda](https://community.plotly.com/u/Melinda)\ **Replies:** 1\ **Last updated:** [May 2, 2026, 3:04am UTC](https://community.plotly.com/t/venn-diagram-does-not-show-text-after-callback-call/64906 "2026-05-02T03:04:36Z")
Hi, When the Venn diagram is first displayed after a callback call, the text displays correctly, but if the callback is called again and different data should be displayed on the diagram, the new text only appears when … --- ## [Dcc.Link(Refresh=False) scrolling up before changing the page](https://community.plotly.com/t/dcc-link-refresh-false-scrolling-up-before-changing-the-page/96821)
**Author:** [@akishira](https://community.plotly.com/u/akishira)\ **Replies:** 1\ **Last updated:** [April 20, 2026, 2:23pm UTC](https://community.plotly.com/t/dcc-link-refresh-false-scrolling-up-before-changing-the-page/96821 "2026-04-20T14:23:35Z")
Need help to find a solution in dcc.Link that scrolling up before it will change the url. this is the main issue i encounter so far when building website using dash framework. --- ## [Dash Mantine DatePicker - Update Year/Month with Callback](https://community.plotly.com/t/dash-mantine-datepicker-update-year-month-with-callback/96785)
**Author:** [@Arick](https://community.plotly.com/u/Arick)\ **Replies:** 1\ **Last updated:** [April 15, 2026, 9:49pm UTC](https://community.plotly.com/t/dash-mantine-datepicker-update-year-month-with-callback/96785 "2026-04-15T21:49:44Z")
Hello, I’m trying to create a calendar app using dmc.DatePicker components. I would like to be able to update displayed years / months with a select component. Initially my thought was to update the defaultDate property… --- ## [Dash Aggrid - custom grandTotalRow "footerValueGetter" or "totalValueGetter" not rendering or showing up](https://community.plotly.com/t/dash-aggrid-custom-grandtotalrow-footervaluegetter-or-totalvaluegetter-not-rendering-or-showing-up/96741)
**Author:** [@charity-g](https://community.plotly.com/u/charity-g)\ **Replies:** 1\ **Last updated:** [April 11, 2026, 8:24pm UTC](https://community.plotly.com/t/dash-aggrid-custom-grandtotalrow-footervaluegetter-or-totalvaluegetter-not-rendering-or-showing-up/96741 "2026-04-11T20:24:45Z")
Hi All, I am trying to implement the examples from the javascript AG Grid docs for customizing grandTotalRows. grandTotalRows works fine and innerRenderer but the customizations of “footerValueGetter” or “totalValueGett… --- ## [Prevent initial callbacks for pattern-matching callbacks](https://community.plotly.com/t/prevent-initial-callbacks-for-pattern-matching-callbacks/94154)
**Author:** [@Consto](https://community.plotly.com/u/Consto)\ **Replies:** 5\ **Last updated:** [April 10, 2026, 4:39pm UTC](https://community.plotly.com/t/prevent-initial-callbacks-for-pattern-matching-callbacks/94154 "2026-04-10T16:39:53Z")
When having a pattern-matching callback with two different types as input and output like @app.callback( Output({“type”: “input”, “index”: MATCH}, “value”), Input({“type”: “button”, “index”: MATCH}, “n\_clicks”), ) def a… --- ## [Plotly charts in Streamlit rendering “undefined” between title and y-axis](https://community.plotly.com/t/plotly-charts-in-streamlit-rendering-undefined-between-title-and-y-axis/96720)
**Author:** [@dannyphantom](https://community.plotly.com/u/dannyphantom)\ **Replies:** 1\ **Last updated:** [April 10, 2026, 2:00pm UTC](https://community.plotly.com/t/plotly-charts-in-streamlit-rendering-undefined-between-title-and-y-axis/96720 "2026-04-10T14:00:39Z")
I’m building a Streamlit dashboard using Plotly and one of my charts is rendering the word undefined between the chart title and the y-axis. It appears where the axis title would normally be. I apply a common layout … --- ## [Dash Aggrid- how huge volume of data can aggrid handle?](https://community.plotly.com/t/dash-aggrid-how-huge-volume-of-data-can-aggrid-handle/96717)
**Author:** [@insane](https://community.plotly.com/u/insane)\ **Replies:** 3\ **Last updated:** [April 10, 2026, 10:35am UTC](https://community.plotly.com/t/dash-aggrid-how-huge-volume-of-data-can-aggrid-handle/96717 "2026-04-10T10:35:39Z")
Hi All, I am using dash aggrid a feature to render table with excel kind of filtering and sorting capabilities. One quick question how huge volume of data aggrid can handle? I have data in s3 bucket as parquet file, I… --- ## [Ploty Candlesticks - draw them cleaner](https://community.plotly.com/t/ploty-candlesticks-draw-them-cleaner/96673)
**Author:** [@Zangief](https://community.plotly.com/u/Zangief)\ **Replies:** 2\ **Last updated:** [April 6, 2026, 5:40pm UTC](https://community.plotly.com/t/ploty-candlesticks-draw-them-cleaner/96673 "2026-04-06T17:40:48Z")
Hi, I’d like plotly to draw candlesticks with sharp borders, like the “Tradingview” candles you see on the right side. Is it possible to make this adjustment and how? Maybe by modifying the plotly scource code? Setting… --- ## [Reverse loop links not working properly](https://community.plotly.com/t/reverse-loop-links-not-working-properly/96667)
**Author:** [@VincMy](https://community.plotly.com/u/VincMy)\ **Replies:** 2\ **Last updated:** [April 6, 2026, 1:56pm UTC](https://community.plotly.com/t/reverse-loop-links-not-working-properly/96667 "2026-04-06T13:56:10Z")
Hi everyone, I am building a Sankey diagram in Plotly for a material flow analysis and I am struggling with reverse flows. My issue is that some flows go from a node on the right side of the diagram (Waste) back to nod… --- ## [Whay was my plolty community account deleted?](https://community.plotly.com/t/whay-was-my-plolty-community-account-deleted/96640)
**Author:** [@fergcd](https://community.plotly.com/u/fergcd)\ **Replies:** 1\ **Last updated:** [March 30, 2026, 7:09pm UTC](https://community.plotly.com/t/whay-was-my-plolty-community-account-deleted/96640 "2026-03-30T19:09:45Z")
Hello, I created account with gmail and posted a new topic about box/violin chart today morning. But after few hours, I got an e-mail saying that my account was deleted by staff. So I created another account with other… [Next page](https://community.plotly.com/tag/question/8.md?match_all_tags=true&page=1&tags%5B%5D=question)