Category: JavaScript

Hi,

In my application I am using two charts for represent different values. I am using LegendModifier on the first chart. Is it possible when i uncheck the series on first chart and the same color series on second chart also need to hide from the second chart. Any event callback function available in LegendModifier ?

Hi,

We use SciChart extensively in our WPF applications and make use of CustomRenderableSeries, writing all kinds of different lines and bitmaps directly to the IRenderContext2D depending on the point metadata.

We’re now looking at doing something similar in JavaScript, but can’t find any examples of this kind of customisation in the documentation. In the JavaScript library, is it possible to draw directly to a ‘canvas’ in the same way as in the WPF version? If so, could you please point to an example?

Many thanks,

Graham.

Hi, I wanted to make a multiple Y-Axis scale with multiple series plot into their respective Y scale. Like this,

Series A plot to 1st Y-axis Scale
Series B plot to 2nd Y-axis Scale
Series C plot to 3rd Y-axis Scale
Series D plot to 4th Y-axis Scale

and all those series are not overlapping each other. I want to do like the picture attached but with the series are not overlapping to each other.

Hi,
I’m trying to implement a market footprint with SciChart framework, I mean is possible create like a plugin for implement in the framework?
My idea was set body color of all the candles invisible and than for every candle set two volume series in horizontal like in the image.

Hi,

I just registered here.
I want to use your tool to create one graph. But licence is too expensive for me. May I create graph during trial mode and use it?
What if trial licence expired? Already created graph will still working or not?

Thanks

I have a color heatmap legend that need to update the yAxis range on the fly. The colorMap doesn’t update as expected. Here’s my codes to update the y axis and colorMap min/max of the heatmap legend:

const newRange = new NumberRange(newMin, newMax);
const yAxis = heatmapLegendRef.current.sciChartSurface.yAxes.items[0];
yAxis.majorDelta = newScale;
yAxis.minorDelta = newScale / 5;        
yAxis.visibleRange = newRange;
yAxis.visibleRangeLimit = newRange;
yAxis.zoomExtentsRange = newRange;

colorMapRef.current.minimum = newMin;
colorMapRef.current.maximum = newMax;
heatmapLegendRef.current.colorMap = colorMapRef.current;

The y axis range has been updated. But the colorMap didn’t. It seems that the colorMap of the heatmap legend cannot be changed. Is it true that I can only recreate the heatmap legend if I want to change the colorMap?

I’m looking on https://demo.scichart.com/javascript-multi-pane-stock-charts-sync-technique
I have a q react application. Can I add/remove subcharts(indicator panes) dynamically?

I’m looking for some direction on how to implement a modifier that reacts to interaction (mouse up/down etc) with a charts axis

• User clicks on axis
• Provide callback for side effect when clicked

Thanks

I am trying to add an axis annotation to a heatmap legend. When this annotation is dragged, the color mapping of the heatmap series and the heatmap legend will be changed. How can I modify the colorMap.gradientStops of the heatmap series and the heatmap legend while the chart is running?

Hi –

I could not find an example in the various examples your provide

I have several charts in different components

When a component is closed I want to ensure the chart is destroyed and there is not potential for memory leak

What is this best way of doing this?

Thanks

I have a chart with multiple series, left and right y-axes and one x-axis, some series are assign to left y-axis and some are right y-axis and they all have the same x-axis.

But there is one specific serie that need to be control on its own. I consider adding another y-axis either on the left or right axis, but the issue with that is that both the left and right axes are vertically stacked with some other y-axes. So, if I add another y-axis, it will just be stacked, but I need this y-axis to be on its own and not stacked.

The image below show my current chart, and the white line serie is the one that need a y-axis of its own. Currently it is attach to the right y-axis.

I have been working with the new Overview Chart feature available in the new 2.0.0-beta.2084 release, and ran into an issue where I can remove lines from the overview surface no problem, but then I always receive an error whenever I try to add one.

I was just wondering if there is a recommended flow for when a parent chart’s renderable series array has traces added or removed. One thing I did try to circumvent this issue was to delete the old overview and add a new one, but I receive either a separate error or the overview would draw without any traces.

I have attached a file with example code that should display the error I receive when you add a line to an overview component. I have also attached an image of the error that appears in the console.

We are using JavaScript Chart Editable Annotations but we need some more modificaions in that which can enhance this feature in terms of user experience.
Currently when the anonations are loaded they are havinng a fixed shape but we want the annotations to be draggable as soon as they are loaded in the charts whitout any extra clicks,this feature is provided by tradingView charts and we also want to provide the same to our users.
I have attached images and videos for better understanding of the issue.
Hope we can get the solution of this issue asap.

Please refer to the below video link for beter understanding.
https://www.loom.com/share/213b66eb21db44f9ac2457a89563a21a

Can SciChart be used in Qt? If so, is there a demo available for reference, or can you provide guidance on how to use it?

I am considering applying server-side licensing for my javerScript application.

In the document below, there is a phrase “Our server-side licensing component is written in C++.”
(https://support.scichart.com/index.php?/Knowledgebase/Article/View/17256/42/)

However, there is only asp.net sample code on the provided github.
(https://github.com/ABTSoftware/SciChart.JS.Examples/tree/master/Sandbox/demo-dotnet-server-licensing)

I wonder if there is a sample code implemented in C++ for server-side licensing.

Can you provide c++ sample code?
Also, are there any examples to run on Ubuntu?

I am getting the alert message on our application and now I got the same message on the https://demo.scichart.com/javascript-line-chart also. It’s not happening all the time. But it’s happening sometimes only on the application.

A client responded that the line diagram drawn by scient.js on the mobile phone could not be seen.
We follow the user’s log and find that there is such content

2022/09/21 07:02:27.981 exception thrown: RuntimeError: function signature mismatch,RuntimeError: function signature mismatch
            at <anonymous>:wasm-function[2101]:0x5fc72
            at <anonymous>:wasm-function[1355]:0x2a029
            at <anonymous>:wasm-function[2409]:0x7ef3a
            at Ch (<anonymous>:wasm-function[4028]:0x12f27f)
            at r._main (<anonymous>:16:687711)
            at Object.Ma [as callMain] (<anonymous>:16:688823)
            at <anonymous>:16:565075

2022/09/21 07:02:27.981 Could not load SciChart WebAssembly module.
            Check your build process and ensure that your scichart2d.wasm, scichart2d.data and scichart2d.js files are from the same version

.
We try to reproduce many different devices. At present, it seems that only the device will happen. The following is the information of the device

Hi,

I’ve been trying to customize the RolloverModifier tooltip content with a vertical chart but am at a loss to try to get the format I need. I’d like to take in all the series info and display them in a tooltip together with a small icon and the y-value next to this.

I was able to do this in the CursorModifier content but unable to do so in the RolloverModifier which is what I really want to use.

I’ve included a CodeSandbox link below showing the custom SVG template and output on the CursorModifier I’d like to use for the RolloverModifier. Is this type of output template possible?

Thanks in advance!

Hi, I have an issue where I am trying to create multiple xAxes where one is normal and the rest are horizontally stacked. Then I calculate the stacked length of each stacked axes, but the issue comes when I change the width of the chart or inspect element, which would alter the width of the chart somehow, I got error saying the total width of the stacked axes is bigger than available size.

I have a codesanbox example of it:
https://codesandbox.io/s/scichart-stacked-xaxis-stacked-length-issue-3knt23?file=/src/App.tsx

I am using percentage for the stacked xAxes length and then I added them up to be 100% total, but somehow it is saying that it is more than available size.

So, my question is, how can I listen or get the width/size changes event of the chart/xAxis, so that I can calculate accordingly?

https://stackoverflow.com/questions/77752586/reactjs-sweep-line-demo-issue-with-multiple-surfaces-not-updating-simultaneousl

I need to make a demo of a sweep line with multiple surfaces with reactjs, but The problem is that when I choose to show more than 1 surface it only plays on the data on the latest created surface and stops drawing data on the old surfaces.

you can see the example here with the code: https://28zf6p.csb.app/

this is a GIF for the problem:
[in the stack overflow link]

note: the reason I need multiple surfaces is that I want to have the charts draggable with sortableJS to follow the design I got.

Looking to try and “link” two timeseries charts when either one is zoomed. The link aspect would be updating the other chart to have the same visible range as the zoomed chart.

Each chart has its visibleRange property updated in response to separate socket events, that happen at similar intervals but different.

Originally, was hoping to have something similar to the onZoomExtents method that fires a callback that would allow me to grab the latest min/max of the visibleRangeProperty of the xAxes to then update the other chart.

Any suggestions on how I could go about doing this?

And if it is not clear what I am talking about I can provide some code snippets.

Hi. I’m trying to add 3DChart to my vue project. And I have a question about the configuration. Can I download .data and .wasm files from the CDN.

For 2D charts , I’ve used recomendation of your release v.2.2:
SciChartSurface.useWasmFromCDN()
It works for me. How I can use CDN for SciChart3DSurface?

Hello, I need to use tooltips to display information to users. However, after using the tooltip, there will be a jam after the tooltip appears and when zooming. How can I optimize the performance.

The following is the code. I use the js example: “Load 500 Series x 500 Points Performance Demo” for transformation

import { NumericAxis } from "scichart/Charting/Visuals/Axis/NumericAxis";
import { FastLineRenderableSeries } from "scichart/Charting/Visuals/RenderableSeries/FastLineRenderableSeries";
import { EllipsePointMarker } from "scichart/Charting/Visuals/PointMarkers/EllipsePointMarker";
import {
  RolloverModifier,
  TRolloverTooltipDataTemplate
} from "scichart/Charting/ChartModifiers/RolloverModifier";
import { ZoomPanModifier } from "scichart/Charting/ChartModifiers/ZoomPanModifier";
import { ZoomExtentsModifier } from "scichart/Charting/ChartModifiers/ZoomExtentsModifier";
import { MouseWheelZoomModifier } from "scichart/Charting/ChartModifiers/MouseWheelZoomModifier";
import { SciChartSurface } from "scichart";
import {
  IXyDataSeriesOptions,
  XyDataSeries
} from "scichart/Charting/Model/XyDataSeries";
import { NumberRange } from "scichart/Core/NumberRange";
import { EAutoRange } from "scichart/types/AutoRange";
import { convertRgbToHexColor } from "scichart/utils/convertColor";
// eslint-disable-next-line
SciChartSurface.useWasmFromCDN();

const divElementId = "scichart-root";

const color = "#368BC1";

const SERIES = 1500;
const POINTS = 188;


const drawExample = async (updateTimeSpans) => {
  const { sciChartSurface, wasmContext } = await SciChartSurface.create(
    divElementId,{ widthAspect: 3, heightAspect: 2}
  );
  const xAxis = new NumericAxis(wasmContext, {
    visibleRange: new NumberRange(0, POINTS),
    autoRange: EAutoRange.Never
});
sciChartSurface.xAxes.add(xAxis);
const dataSeriesArray= new Array(SERIES);;
const rendSeriesArray=new Array(SERIES);
const yAxis = new NumericAxis(wasmContext, {
    visibleRange: new NumberRange(-5000, 5000),
    autoRange: EAutoRange.Never
});
// yAxis.labelProvider.numericFormat = ENumericFormat.Decimal_0;
sciChartSurface.yAxes.add(yAxis);
for (let i = 0; i < SERIES; i++) {
  const dataSeries= new XyDataSeries(wasmContext);
  const rendSeries= new FastLineRenderableSeries(wasmContext, {
      dataSeries,
     stroke: color,
      strokeThickness: 3,
      pointMarker: new EllipsePointMarker(wasmContext, {
        width: 5,
        height: 5,
        strokeThickness: 2,
        fill: "white",
        stroke: color
      })
  });
  dataSeriesArray[i] = dataSeries;
  rendSeriesArray[i] = rendSeries;
sciChartSurface.renderableSeries.add(rendSeries);
}
sciChartSurface.chartModifiers.add(new ZoomExtentsModifier(), new ZoomPanModifier(), new MouseWheelZoomModifier(),new RolloverModifier(wasmContext));
const loadPoints = () => {
  const newTimeSpans=[];

  // Start counting Points generation time
  const generateTimestamp = Date.now();

  const xValuesArray = new Array(SERIES);
  const yValuesArray = new Array(SERIES);
  const strokeArray =  new Array(SERIES);
  for (let i = 0; i < SERIES; i++) {
      // Allocate data arrays
      xValuesArray[i] = new Array(POINTS);
      yValuesArray[i] = new Array(POINTS);

      // Clear data, if any
      dataSeriesArray[i].clear();

      // Generate stroke
      const r = Math.random();
      const g = Math.random();
      const b = Math.random();
      strokeArray[i] = convertRgbToHexColor(r, g, b);

      // Generate points
      let prevYValue = 0;
      for (let j = 0; j < POINTS; j++) {
          const curYValue = Math.random() * 10 - 5;

          xValuesArray[i][j] = j;
          yValuesArray[i][j] = prevYValue + curYValue;

          prevYValue += curYValue;
      }
  }

  // Add the first time span: Generating 1M data points
  newTimeSpans.push({
      title: "Generate 500x500 Data Points",
      durationMs: Date.now() - generateTimestamp
  });

  // Start counting batch append time
  const appendTimestamp = Date.now();
  for (let i = 0; i < SERIES; i++) {
      dataSeriesArray[i].appendRange(xValuesArray[i], yValuesArray[i]);
      rendSeriesArray[i].stroke = strokeArray[i];
  }

  // Add the second time span: Generation of data point
  newTimeSpans.push({
      title: "Append 500x500 Data Points",
      durationMs: Date.now() - appendTimestamp
  });

  // Subscribe to sciChartSurface.rendered event,
  // and calculate time duration between the append and
  // the first frame after it
  const firstFrameTimestamp = Date.now();
  let frameIndex = 0;
  let nextFramesTimestamp;
  const handler = () => {
      if (frameIndex === 0) {
          // Add the third time span: Render the first frame
          newTimeSpans.push({
              title: "Render the frame",
              durationMs: Date.now() - firstFrameTimestamp
          });
          nextFramesTimestamp = Date.now();
      } else {
          // Unsubscribe from sciChartSurface.rendered
          updateTimeSpans(newTimeSpans);
          sciChartSurface.rendered.unsubscribe(handler);

          // Zoom extents at the end of performance measurement
          sciChartSurface.zoomExtents();
      }
      setTimeout(sciChartSurface.invalidateElement, 0);
      // Increment frame index
      frameIndex++;
  };
  sciChartSurface.rendered.subscribe(handler);
};
  loadPoints()
};

drawExample();

How to update the text Annotation in JavaScript. I can add the new Text annotation but I can’t update the old text Annotation. whether we have any option in sci chart for JavaScript.

I’m a C# developer looking to evaluate working with SciChartJS for a possible future project.

I’ve created a .NET Blazor Project working with JavaScript Interop and I would like to extend the CustomChartModifier2D in TypeScript.

I’ve not used npm to install SciChart into the project, rather I’m using the CDN approach in my _Host.cshtml file.

<script src="https://cdn.jsdelivr.net/npm/[email protected]/index.min.js" crossorigin="anonymous"></script>

I’ve been searching online for a SciChartJS TypeScript definition file so that I can leverage TS Strongly Typed system in my test project.

Is there one? Or do I need to build my own, or even is there an already made example of extending SciChart with TypeScript somewhere I’ve missed?

Thank you

The chart is only showing 3 of 4 Tooltips, is there a way to avoid this?

Hi all,

Today, I follow the Tutorial 01, but I can not set up the SciChart.js project,
I am sure that I do the same step like Tutorial,
some one can help me to realize the error messages?
Thanks a lot.

PS:error messages is attached file

Sincerely,

Alec

It’s possible to implements something like WPF ‘s SciChartOverview in SciChart JS ?

Hi,

We found that the part of our project that uses scichart does not work correctly on iOS12, and then we tried to open a browser on iOS12 to the scichart javascript demo webpage, and found that it did not work.

What is the minimum iOS version supported by javscript scichart?

The SciChart Legend and Cursor Tooltip (Showed only Y axis value) are not display after changing the graph layout.
I need to show the graph legend and Tooltip for all the Y axis.

The chart should also show the x axis value and y axis value on the Tooltip for more clarity.

Before changing the layout the legend was showing the five series vertically one below the other. But i need to show the five legends in horizontally (One after the another).

I have added the chart definition code. The data is added though Ajax call and code for that ajax call is not added.

I have attached the image for your reference.

I have attached the zip file with the html file.

Hello, I am using SciChartJS and have a new requirement from our users as follows that I need help with the implementation. Any pointers from anyone would be a great help.

**Requirements: **

• Assume that x-axis is Time and y-axis is prices.
• There are multiple series in the chart (e.g., Bid Price, Ask Price)
• Allow user to select a time on xAxis using CTRL + CLICK
• When the user selects the time, show the rollover line and the tooltip for all series at the selected time
• This rollover line and tooltip should remain visible until the user selects a new time on the x-axis at which point the rollover tooltip should display the tooltip for the new point.

I started inheriting the RolloverModifier but couldn’t find an appropriate method to show the tooltip.

So, I started implementing the above feature using CustomModifierBase2d and adding a VerticalLineAnnotation for the rollover line. But again, struggling with the tooltip.

If someone could help me out or give me pointers, that would be highly appreciated.

Best Regards,
Sachin Patel.

I am new to scichart javascript library and trying to run the provided examples locally. I was working on this example
https://www.scichart.com/documentation/js/current/The%20Candlestick%20Series%20type.html

I am able to run this example locally. now I want to add cursor snapping in it. An example would be tradingview candlestick charts. in those charts cursor snaps to nearest candles.
I am trying to achieve similar. I looked into the docs but couldn’t find the answer.

Thanks !

I am considering applying server-side licensing for my javerScript application.

In the document below, there is a phrase “Our server-side licensing component is written in C++.”
(https://support.scichart.com/index.php?/Knowledgebase/Article/View/17256/42/)

However, there is only asp.net sample code on the provided github.
(https://github.com/ABTSoftware/SciChart.JS.Examples/tree/master/Sandbox/demo-dotnet-server-licensing)

I wonder if there is a sample code implemented in C++ for server-side licensing.

Can you provide c++ sample code?
Also, are there any examples to run on Ubuntu?

From what I’ve read into chrome’s roadmap, everything seems on track for a webgpu release in May.
Is scichart taking this into account and planning to add webgpu support?
I suspect this would make quite an impact on performance, so it would be a great addition.

Thanks!