Chartjs ticks callback example graphOptions = { ///Boolean - Whether grid protected function getData(): array { return [ 'datasets' => [ [ 'label' => 'Blog posts created', 'data' => [0, 10, 5, 2, 21, 32, 45, 74, 65, 45, 77, 89 Aug 27, 2021 · I also want to change the value of context. 4, 0. The documentation has a list of all the possible customizable callback fields. View the main QuickChart repository here. Jan 20, 2023 · Hi there, I couldn’t get tickformat to work properly with ChartJs v4. In this case, the Y axis grid lines are colored based on their value. callback method in the axis configuration. If you return null or undefined the grid line will also be hidden Jul 24, 2018 · Removing radar chart ticks in ChartJS If you’ve worked with ChartJS, you will know that it provides a kind of chart called Radar Chart. Dec 15, 2021 · Steps to Reproduce Set suggestedMin, suggestedMax, and data as shown in example. You can format numbers, dates, and other data types within these callbacks. This is fixed. We’ll provide a callback function that would be called to format each tick value. For time scale, it is a timestamp Creating Custom Tick Formats It is also common to want to change the tick marks to include information about the data type. Upgraded your chart to Chart. See callback. Setting the range Minimum and maximum values To set the range of chart values, use axis. Oct 13, 2025 · Axes Axes are an integral part of a chart. 5, 3, 3. I don't want the x-axis ticks to mirror the data labels, i want Oct 13, 2025 · Cartesian Axes Axes that follow a cartesian grid are known as 'Cartesian Axes'. js config: Oct 10, 2017 · This worked for me: I've converted string to bold unicode characters and passed them to tooltip inside label callback. width. Depending on your use case, you may want to call the default formatter and then modify its output. drawBorder has been renamed to scales[id]. borderColor has been renamed to scales[id]. display. To make sure we have full control we will need to use a callback for the scales and control the tick labels based on a certain condition. callbacks. 2. Apr 28, 2025 · Approach 2: By Custom Tick Callback In this approach, we have defined a function to generate desired ticks that is 0. Jul 23, 2025 · Output: Approach 2: Using Callback In this approach, we are using the callback property within the options configuration. scale. 2 per gridline you have just under 16 major ticks. label worked to let me remove commas in the tooltips, but when I use options. Aug 21, 2024 · In this approach, we are using the ticks. If not set, the ticks are labeled automatically using the nice numbers algorithm. use options. Head over to the gallery to see some examples of custom axes and scales. max. ticks May 27, 2020 · I have a chart. js line chart where the x axis labels are plain old numbers, e. We are controlling the x-axis labels in the Line chart according to the user input in the input box. This gives the output that looks like: Oct 13, 2025 · When the chart data or options are changed, Chart. Hover Mode: The hover option is set to nearest, ensuring the nearest data point is highlighted when hovered over. Oct 13, 2025 · Creating Custom Tick Formats It is also common to want to change the tick marks to include information about the data type. major, it defines options for the major tick marks that are generated by the axis. js by default. log statement in their ever being printed so it seems it's not even Sep 28, 2023 · We can make creating charts on a web page easy with Chart. For time scale, it is a timestamp I've just started working with Chart. Ticks code examples. It works with v2 though, but there I can’t get enough spacing between chart and legend…anybody a valid example of using tick format? { type: 'pie'… Oct 19, 2018 · 7 I have a chart, using chart. Cartesian axes are used for line, bar, and bubble charts. Since version 4. scaleLabel Oct 13, 2025 · Docs Line Data structures (labels) Axes scales Common options to all axes (min, max) Linear Axis Linear Axis specific tick options (stepSize) Step Size Oct 13, 2025 · Creating Custom Tick Formats It is also common to want to change the tick marks to include information about the data type. Example I use a callback to localize the number format of the y-axis ticks on a line chart. ts:1133 Dec 2, 2021 · I see several examples where people are using chart. The example below puts a '$' before every row. Oct 22, 2019 · I cannot figure out how to set custom major ticks on a logarithmic x-Axis on charts. In this article, we’ll look at how to create charts with Chart. In the below example, I set the "title" to show the label name, "label" to show the value, and added the percentage to "afterLabel". json file with I am using line chart from http://www. Here's the part below I'm confused: Simple HTML5 Charts using the <canvas> tag. This example chart uses the labels attribute to control the X axis display. org/docs/latest/axes/#tick-configuration it is not mentioned!? Oct 13, 2025 · When the chart data or options are changed, Chart. For example, adding a dollar sign ('$'). Axes should always derive from Chart. Oct 13, 2025 · Open source HTML5 Charts for your websiteGrid Configuration This sample shows how to use scriptable grid options for an axis to control styling. callbacks: For tooltips, customize the content using callback functions. Find guides, explainers and how to's for every popular function in JavaScript. These components are: border grid lines tick tick Sep 16, 2025 · I have a Chart. Jun 29, 2021 · I'm trying to build a bar chart with custom caret and position on Char JS 3. Sep 12, 2024 · In this example: Zoom and Pan: The chartjs-plugin-zoom plugin is used to add zooming and panning capabilities. Jul 26, 2024 · Creating Custom Tick Formats We can customize the appearance of tick marks on the axis and include additional information. Oct 13, 2025 · Docs Animations animation (delay) Animation Callbacks Bar Stacked Bar Chart Options Scriptable Options Last Updated: 10/13/2025, 5:37:11 AM ← Radar Chart Drop → Jun 29, 2022 · Nice solution, where did you find it? Under chartjs. callback and options. The goal will be showing at an interval of every 6 hours. xticks. 5, 5. io, a web service for generating static charts. callbacks property with the labelColor method to return an object with the borderColor and the backgroundColor properties. In a radial chart, such as a radar chart or a polar area chart, there is a single axis that maps points in the angular and Oct 13, 2025 · Open source HTML5 Charts for your websiteCommon tick options to all cartesian axes Namespace: options. Is there a way to define a minimum amount of ticks? Jan 18, 2018 · I'm trying to implement a hover callback in the chart I made using Chartjs. Oct 13, 2025 · Step Size If set, the scale ticks will be enumerated by multiple of stepSize, having one tick per increment. js In a new folder, create the package. 2, 0. I have tried latest version scales option. They include many options like the colors, radius, width, text direction, alignment, and more. ts:1166 New Axes Axes in Chart. 1)', }, title: { display: true, text: (ctx) => ctx. borderColor has the border color of the tooltip. js: chart types and elements, datasets, customization, plugins, components, and tree-shaking. x, but since the callback above is already return ing a value, I'm a little confused as to how to accomplish that. 5, 2, 2. Interface: Tooltip Hierarchy Plugin ↳ Tooltip Properties defaults • Optional defaults: Partial <AnyObject> Default options used in the plugin Inherited from Plugin. plugins. js, and I am getting very frustrated very quickly. parsed. . Jul 1, 2022 · The third one is the array of ticks items and using the index you can get the item and the label. Sep 15, 2020 · I've set up the following callback function which (crudely) grabs the month from the set of labels, checks to see whether it already exists and if not, returns it as an axis label Oct 13, 2025 · This sample shows how to use different tick features to control how tick labels are shown on the X axis. callbacks • callbacks: TooltipCallbacks <TType, TooltipModel <TType>, TooltipItem <TType>> Defined in types/index. Oct 13, 2025 · Custom Tooltip Content This sample shows how to use the tooltip callbacks to add additional content to the tooltip. This example sets up a chart with a y-axis that creates ticks at 0, 0. 1, 0. The chart adjusts the label intervals dynamically according to the user input. datasets[0]. yAxes. js Bar chart to present the data related to GeeksforGeeks. Probably going to have to go with moment for now even though it is legacy. Scale but this is not a mandatory requirement. json file with May 18, 2021 · The ticks and point labels configurations have got a callback property in order to format the tick or point label. plugins: { beforeDraw: () => { console Nov 30, 2016 · Wow, actually did not expect a reply this fast. myBar. JS in a Blazor project and seem to have run into a limitation, there seems to be no obvious way to pass a callback, for example a callback for the tick to modify the tick text disp Brings Chart. grid. value <= 100 ? ctx. Please take a look at below runnable code and see how it works. chart. I have implemented ticks callbacks for both x- and y-axis. In addition, booleans are provided to toggle different parts of the X axis grid visibility. But how do you make a multiple x-axes label in chart. tooltipFormat, but I can't seem to do it for the x-axis tick lables. x. json file with Oct 13, 2025 · The scriptable context is described in Options section. js chart, an equivalent of matplotlib's matplotlib. callback function in the y-axis configuration of Chart. In a cartesian chart, there is 1 or more X-axis and 1 or more Y-axis to map points onto the 2-dimensional canvas. Help? :) You can see in this screenshot that I have already applied a format to the ticks in the x axis. Callback - just operate with values. Currently I'm using Chartjs 3. Installation If you are using npm: npm install quickchart-js Usage This library provides a QuickChart object. But, when I run the Chart. ticks. May 24, 2020 · I am looking for a way to manually specify x/y ticks locations on a chart. Because a wide variety of customizations are possible, we've prepared a number of examples. scales[id]. Set a null callback for the Y axis ticks, and note extra digits in Y axis tick labels. Aug 17, 2020 · We have the options. Adjusted the callback to compute the tick label based on index. Remove callback, and note change in tick labels. Nov 30, 2016 · Wow, actually did not expect a reply this fast. This example sets up a chart with a y axis that creates ticks at 0, 0. floor () to the tick values, we ensure that only whole numbers are displayed. scaleLabel Aug 21, 2024 · In this approach, we are using the ticks. Here's the part below I'm confused: Oct 10, 2023 · I presume you are using chartjs 4 since ticks in chartjs 3 are configured in the options. In my case i needed only numbers 0123456789 -> 𝟬𝟭𝟮𝟯𝟰𝟱𝟲𝟳𝟴𝟵 [these are unicode bold chars], so i created simple map or you can use library for conversion example: conversion library i've found (not tested Apr 25, 2017 · If you want to add the percentage to the tooltip display, you can use tooltip callbacks. This hook is called separately for each scale in the chart. chartjs. Blazor development by creating an account on GitHub. jsv3 asked Jun 18, 2022 at 21:22 DKage 18817 1 Mar 7, 2017 · The commented out callback on the ticks is for the situation where (like me) you do not want the tick values shown in scientific notation on the log scale. These are great for visualising the extent to which a set Jul 25, 2024 · This method allows for more granular control over which labels are shown and which are hidden based on custom conditions defined in the callback function. Jul 23, 2024 · Example 1: In the below example, we have used the Chart. js In my example, I want ticks on x= {0. Adding or Removing Data Adding and removing data is supported by changing the data array. js data visualization with a couple of charts from scratch: Build a new application with Chart. x? Spent the whole day trying many things and don't look I'm getting closer to make it work. In my opinion, callback is a generic name and not really explain the goal of this property. Don't hesitate to follow the links in the text. graphOptions = { ///Boolean - Whether grid Apr 7, 2023 · For instance: Example chart In this sample, the X axis displays only the hour-portion of the tick, which makes it hard (er) for the user to understand on what day a tick occurs. borderWidth has been renamed to scales[id]. Oct 13, 2025 · Open source HTML5 Charts for your websiteconst config = { type: 'line', data: data, options: { responsive: true, interaction: { intersect: false, axis: 'x' }, plugins An undocumented feature of the ChartJS library is that if you pass in a function instead of a string, it will use your function to render the y-axis's scaleLabel. We do not know the range of the data in an individual log in advance, so in order to maximize the dynamic range of the plot, we compute suggestedMin and suggestedMax from the data. On the y axis I need to have fixed values, for example: Fault and Healthy, but chart. Syntax: scales:{ x:{ ticks:{ // Callback function } } } Example: The below example implements the callback function approach to hide the x-axis labels in chart. data = newData; and update the chart window. js development by creating an account on GitHub. tooltips. Oct 13, 2025 · Open source HTML5 Charts for your websiteOption Context The option context is used to give contextual information when resolving options and currently only applies to scriptable options. For time scale, it is a timestamp Tick Configuration Note These are only the common tick options supported by all axes. In the example above, that would look like: Dec 15, 2021 · We use a tick callback to add those units to the Y axis tick labels. options. 315, 0. js charts to Blazor. For example, we can write: Labels There are several different types of labels: axis labels, tick labels, and data labels. Fonts are used as objects now. However, for the time series scale, each data point is spread equidistant. x[0]. options. Y axis tick labels are automatically generated based on values unless you are using a categorical axis. js 4. js work dynamically and add values. json file with Oct 13, 2025 · Step-by-step guide Follow this guide to get familiar with all major concepts of Chart. d. 5, 4, 4. org/docs/latest/axes/#callbacks My problem was too much labels generated, so some of them chartjs not showed. May 18, 2020 · Is it possible to separate styles in ticks for xAxes or draw by some other function near. ticks property instead of options. Below is the screenshot for the same and the working sample code. 5, 1, 1. For a logarithmic scale, it appears using a callback overrides the built-in autoSkip feature, and the ticks end up overlapping each other. js Oct 13, 2025 · {x, y} object This is a shorthand for defining left/right and top/bottom to the same values. xAxes. 4 bu May 13, 2016 · @gitaarik to filter the labels, you could change the callback function that generates the tick strings. By applying Math. linear logarithmic category time timeseries Visual Components A cartesian axis is composed of visual components that can be individually configured. However, I am not using Timescale. These components are: border grid lines tick tick Interface: Tick Properties label • Optional label: string | string [] Defined in types/index. For this, we need to override the ticks. Oct 13, 2025 · Great! Behold the updated chart: However, there’s one more nitpick: what are these numbers? It’s not very obvious that the units are centimetres. js to skip decimal points on the y-axis. There are multiple levels of context objects: chart dataset data scale tick pointLabel (only used in the radial linear options. js but not react-chartjs-2. ts:827 Methods afterBuildTicks Optional afterBuildTicks (chart, args, options): void Desc Called after scale has build its ticks. json file with Jun 27, 2023 · I'm creating a time series chart using Chart. Type declaration (this, tickValue, index, ticks): string | number | string [] | number [] Returns the string representation of the tick value as it should be displayed on the chart. 3. The function takes in a few arguments, and to make changes you Jan 18, 2018 · I'm trying to implement a hover callback in the chart I made using Chartjs. callback メソッドをオーバーライドする必要があります。 次の例では、Y軸のすべてのラベルが頭にドル記号を伴って表示されます。 コールバックが null または undefined を返す場合、関連するグリッド線は非表示になります。 Aug 10, 2015 · I am using Chartjs for showing diagrams and I need to set title of y axis, but there are no information about it in documentation. To do this, you need to override the ticks. data. callback means that you are responsible for all formatting of the label. I needed to make bold only part of label. time. For example, 10px left / right and 4px top / bottom padding on a Radial Linear Axis tick backdropPadding: Oct 13, 2025 · Step Size If set, the scale ticks will be enumerated by multiple of stepSize, having one tick per increment. Apr 7, 2023 · For instance: Example chart In this sample, the X axis displays only the hour-portion of the tick, which makes it hard (er) for the user to understand on what day a tick occurs. Some chart configs include Javascript functions. labels array. stepSize to control the increment of each tick mark. color. Simple HTML5 Charts using the <canvas> tag. datasets [0 I am able to format the tooltips when I hover over a datapoint on a line chart via options. The documentation explains how to create custom tick form Oct 13, 2025 · Ticks callback on time scale now receives timestamp instead of a formatted label. The method receives 3 arguments: value - the tick value in the internal data format of the associated scale. They are used to determine how data maps to a pixel value on the chart. Nov 26, 2019 · I have a chart that ticks are barely distinguishable. In the x axis: calculate your own ticks and assign the array to data. For example: Oct 1, 2021 · This can be done by defining an afterBuildTicks together with a ticks. tick. border. js will animate to the new data values and options. scales[scaleId]. May 15, 2023 · const config = { type: 'bar', data, options: { scales: { y: { beginAtZero: true, max: 130, min: 0, grid: { color: (ctx)=> ctx. update(); How can i also update the max scale of the yAxes?? I have to use a max scale so i cant use suggestedMax. min and axis. For every other label just return an empty string. js3 chart. defaults Defined in types/index. Oct 13, 2025 · Step-by-step guide Follow this guide to get familiar with all major concepts of Chart. Tooltips We can change the tooltips with the option. We'll build a Chart. [sample-code] Dec 8, 2021 · When i try to use a global variable in this function i always get undefined. You can find below an example of what I#m trying to do, I want Oct 13, 2025 · Open source HTML5 Charts for your websiteTime Series Axis The time series scale extends from the time scale and supports all the same options. Dec 5, 2020 · We have the options. callback: For axis labels, use callback functions to format the tick labels. js invokes the function with these three arguments: value, index, values. Adding the full date to every tick will make the chart too crowded. They are often useful for comparing the points of two or more different data sets. To add data, just add data into the data array as seen in this example, to remove it you can pop it again. In an attempt to make it more clear what I want to achieve: instead of rendering the X axis ticks as: Oct 13, 2025 · Cartesian Axes Axes that follow a cartesian grid are known as 'Cartesian Axes'. js chart that renders perfectly in a Chrome browser on my laptop. 1. This requires special treatment if you're sending a POST request. I have found a comment on G Oct 13, 2025 · Step-by-step guide Follow this guide to get familiar with all major concepts of Chart. 63}, but so far it only works with 0. In callback, you can pass your date and the desired format it will return the formatted date. Oct 13, 2025 · Label Callback The label callback can change the text that displays for a given data point. scales. Parameters QuickChart for Javascript This is a Javascript client for quickchart. tooltips properties. Parameters Returns string | number | string [] | number [] Defined in types/index. Here’s the updated axes configuration: Oct 13, 2025 · Radar Chart A radar chart is a way of showing multiple data points and the variation between them. org/ As you can see max value (130) and min value (60) for Y axis are chosen automatically , I want max value = 500 and May 3, 2016 · I have a Bar Chart with this Option scales: { yAxes: [{ ticks: { display:false, beginAtZero:true, max: 1150 } }] } now i change the values of my only dataset barChartData. js, and I see there is an option maxTicksLimit, but that isn't enough, because my data on the X-Axis can range between 5 (so in this case I would need 5 ticks at 1 stepSize) but can go as high as 320, in this case I would need 5 or 8 ticks with 20 or 25 stepSize. 0 you can can have a method in the scale to get all label items (see #10966) Keep in mind that overriding ticks. It needs to display 06/2020 instead. length - 1 ? null : val, }, grid: { borderColor: Utils. These features include: See full list on quickchart. callback function on the y-axis. Tick Configuration Note These are only the common tick options supported by all axes. Link to modified example Step Size If set, the scale ticks will be enumerated by multiple of stepSize, having one tick per increment. So, for displaying the label of each data on the Y-axis, this callback function will be executed, and it will transform each value as you have encoded it. Oct 5, 2020 · Expected Behavior We can specify a callback for the ticks of an axis in the form ticks: { callback: function (value, index, values) { return value; } } The callback function should receive the default tick label as first argument and a nu Oct 13, 2025 · Step Size If set, the scale ticks will be enumerated by multiple of stepSize, having one tick per increment. These axes are known as 'cartesian axes'. ts:3085 Oct 13, 2025 · Step-by-step guide Follow this guide to get familiar with all major concepts of Chart. Please see specific axis documentation for all the available tick options for that axis. Nov 16, 2021 · const scaleOpts = { reverse: true, ticks: { callback: (val, index, ticks) => index === 0 || index === ticks. plugin. js chart. labels as the source of information for ticks. Use axis. I have my stacked bar chart working, but I can't get the click "events" to work. Jan 15, 2023 · v4 version ticks collback return timestamp, v3 returned time in string #11062 Feb 15, 2025 · const scaleOpts = { reverse: true, ticks: { callback: (val, index, ticks) => index === 0 || index === ticks. axis + ' axis', } } const scales = { x: { position: 'top', }, y: { position: 'right Mar 29, 2022 · I am currently trying to show a text stocked in the data in the tooltip, I can#t figure how to make it work, I have tried many things. The arguments for this method are given below: value: This is the tick value in the internal fat format. io The most comprehensive JavaScript chart. tooltip. y. Users can zoom in and out using the mouse wheel or pan by dragging. pyplot. 2020-06). Contribute to chartjs/Chart. These features include: Simple HTML5 Charts using the <canvas> tag. Oct 13, 2025 · const config = { type: 'line', data: data, options: { responsive: true, plugins: { title: { display: true, text: (ctx) => 'Point Style: ' + ctx. Dec 8, 2021 · For example, how can I bind/add a JavaScript function at runtime? Another nice thing I found is the user can click on the legend to exclude a category for the chart. 0 has changed. We have used the styling axe configuration options like ticks, grid, and border to style the x and y axes of the Bar Chart with various colors and other options. Complete HTML Example Jun 29, 2022 · Nice solution, where did you find it? Under chartjs. Oct 13, 2025 · The scriptable context is described in Options section. g. chart. js? eg: example as in this picture: How to group (two-level) axis labels Tick Configuration Note These are only the common tick options supported by all axes. We have two datasets with differing units in the same chart and want to have the horizontal Dec 22, 2022 · I am using Chart. color : undefined }, ticks: { callback: (value) => value > 100 ? '' : value } } }, plugins: { annotation: { annotations: { annotation1, annotation2, annotation3 } } } } }; Aug 21, 2018 · We have values which can vary when the site is loaded and we want to dynamically set the tick step size. id • id: string Defined in types/index. Is there a way to target a specific ticks and change the color, font-size or background, to appear more visible? Solution I could also set for, Oct 13, 2025 · Open source HTML5 Charts for your websiteconst config = { type: 'line', data: data, options: { responsive: true, plugins: { title: { display: true, text: 'Chart. Four cartesian axes are included in Chart. Taking DataLabels plugin as example, maybe the property could be renamed in formatter, aligned with the format option for tick as well. axis + ' axis', } }; const scales = { x: { position: 'top', }, y: { position Jun 15, 2022 · After some digging, I used the callbacks. I need y axis to be set like on picture, or on top of y axis so Jun 20, 2016 · here is my code. Syntax: options: { scales: { y: { ticks: { callback: function(value) { return value >= 0 ? value : ""; } } } } Example: This example shows the implementation of the above-explained approach. Context Our project plots values in engineering units (psi, kPa, V, °C, etc. js. ) logged from our controllers. Import it, instantiate it, and set your Chart. ts:2926 Dec 2, 2021 · I see several examples where people are using chart. Really appreciate it! I also started using the tick callback now. The object is preserved, so it can be used to store and pass information between calls. Tried the chartjs-adapter-luxon but could not get that working either. callback to try to fix the labels on the bottom, not only does it not work, but I don't see the console. Currently, it looks likes this: but I only want the x-axis to be labeled every 15 seconds. So in this example, there would be 3 ticks, at 12:38 Oct 13, 2025 · Step-by-step guide Follow this guide to get familiar with all major concepts of Chart. The tooltip, however, is still showing the unformatted string (e. Major Tick Configuration Namespace: options. A common example to show a unit. js can be individually extended. Nov 16, 2021 · Here are all callbacks in chartjs doc https://www. js v3 (make sure to set version=3 in your request) You have a little under 80 datapoints in your data series, so at 0. Can someone help me make this on v3. I just added beforeDraw callback in plugin but it's not called ever. Details 81 Configuration options and properties for chartjs 3. Jun 16, 2023 · The callback function can process three arguments because chart. js application on a tablet only This sample shows how to use different tick features to control how tick labels are shown on the X axis. Scale labels The axis. org/docs/latest/axes/#tick-configuration it is not mentioned!? Jun 18, 2022 · I also tried putting the ticks callback inside the options on the chart creation on options: scales: x: ticks but it did not work either way. randomColor (1), color: 'rgba ( 0, 0, 0, 0. i need to set initial value as "0" in both x and y axis scales. Contribute to mariusmuntean/ChartJs. In order to change font size of x axis ticks you have to use following configuration. In an attempt to make it more clear what I want to achieve: instead of rendering the X axis ticks as: Aug 15, 2017 · The first key is ‘ticks’, which points to yet another object, which has a key ‘callback’ which points to a callback function. Let’s apply a custom tick format to both axes to make things clear. Jun 20, 2016 · here is my code. Dec 22, 2016 · 15 I have solved this problem by using ticks callback method and by setting autoSkip false. [2,4,15,45,90], which represent days on this chart. Nov 21, 2022 · This was overriding your other gridline settings. これを行うには、軸設定の ticks. Customizing axis labels X axis tick labels are controlled by the data. I suspect react-chartjs-2 may behave slightly differently when it comes to options. autoSkip: false to ensure the ticks aren't reduced Adding your own ticks in the y axis is slightly Tick Configuration Note These are only the common tick options supported by all axes. Mar 21, 2017 · There is a way to create two label for y-axes. wdpytdw fjfz iwforjzz uunali xpken auyzikftg tfnwms fhuvrk bixxp ydoridm haingsj nnbxmsx mxrrwvf zqv xezx