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 ?

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!

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 !

Hi,

I am getting console error and page is crashing and reloading the page.

Hi,

In my application I am hiding some of the line chart by changing the visibility. When changing the visibility the markers is not hiding from the chart. Its happening only the mouse pointer is inside the chart before the visibility change. I have created a sample application and created the video recording also. Please check the attached file for example code and video. On the video you can saw that 2 line visibility is changed and line are hidden from the chart and the markers not hiding from the chart.

This is my first time in this forum, and I am analyzing SCIChart. I am planning to use it in my software, but there are some questions I haven’t been able to answer yet.
My software is similar to an IDE, where the user can build their custom applications and run on windows environment, but we also provide an option to save all the interface in html and javascript. Since SCIChart provides not only WPF Charts but also javascript Charts, I would like to know the following:

1- Does the javascript charts have the same functionalities as the wpf charts? XY Charts or Pie charts for example, will they have the same functionalities in WPF and Javascript ?

2- Does the appearence of the charts in WPF and Javascript are the same? Do they look exatcly the same?

I believe these are my biggest doubts so far. Thanks in advance !!

Can I implement a feature in SciChart that allows me to pause and resume rendering activity on a SciChart renderable surface when a user clicks on the SciChart renderable surface?

Hi,

I have a uniform heatmap with multiple ’tiles’ of data loaded in, by using multiple UniformHeatmapDataSeries / UniformHeatmapRenderableSeries.

The user is allowed to pan around/zoom around the heatmap.

I want to build two charts to display the ‘visible heatmap average’, one for each axis. For example, I would display a line chart underneath the heatmap. The first point on this line chart would represent the average value of all cells in the first column of the heatmap – I need this to take into account all of the UniformHeatmapDataSeries that are currently in the viewport, treating them as a singular heatmap.

I’ve seen the NumericAxis.getCurrentCoordinateCalculator(), which looks promising, but I’ve not yet worked out if that can do what I need.

Any thoughts on the best approach?

Thanks
Joe

Hi,
I’m trying to synchronize the pie chart and the line chart in React. I’ve already done this for two line graphs.

They both use the same data table. And I want to know if it’s possible, if when I zoom in on the line chart, it updates the Pie chart with the new range.

Thanks, (sorry for my english ^^)

Dear Andrew,

Thank you for the past answers. I have a new question. I have a heatmap with 2 line charts at its left aand top position. the top line chart plot the horizontal values where the mouse if hovering and left chart displays vertical values from the mouse position.

This is working great, but the issue is the heatmap is not always square and I am trying the aligh the line charts with the heatmap dimensions

two issues,

1. the heatmap X/Y dimension are not always same, in fact I have a function which listens to the changing heatmap zoom factor and makes sure the X/Y are always “square” as we want to show the heatmap with square pixels. (see video #2) https://youtu.be/wXStF-7bWsw

2. As I dynamically chage the size of the plot the… the proportion of actual chart area to axis lable changes thus varying the overlap. (see video #1) https://youtu.be/loAVpYSRJ38

Let me know if you need more information,

Best,

Pramod

Hello,

Is there a way to render textbox as an annotation in the chart ? The workaround i could think of is to use CustomAnnotation and supply SVG (svgString) with HTML input tag enclosed. Please let me know if there is a better way to perform this.

Hello,

I want to render a base64 image in ScichartJS without actually rendering it in DOM. I saw that you have these guides in WPF:
https://support.scichart.com/index.php?/Knowledgebase/Article/View/17213/34/
https://www.scichart.com/documentation/win/current/webframe.html#Screenshots,_Printing_and_Export_to_XPS.html

However it is difficult to achieve it in Typescript. Is there a guide or any ideas on how to do it? I would appreciate any answer.

Imagine I have a chart with a RolloverModifier, such that I see the point marker, and also a CursorModifier so I see the axis labels with the exact value I’m hovering.
This chart has the axis title hidden, and also the labels hidden, so I can really only see them trough the CursorModifier axis labels.
Since the axis title and labels are hidden, the axis labels spawn inside the chart, and the point marker from the RolloverModifier may be drawn on top of the labels.

I’d like to properly control drawing order here, so my axis labels get prioritised.
Is there a way to do so?

Codepen example: https://codepen.io/jrfv/full/VwqVBdo

This question is related to this.

I still see a problem with memory accumulation and I just can’t cope with it. For clarity, I created a simple example with the simplest graph, two axes, one line series and 10,000 values in this graph.

When the page loads, no code is executed and there is only a button that creates one graph, adds it, waits 3 seconds and deletes it.

I use this button to test the speed and the fact of memory accumulation. For the simplest test, it is enough to simply create a certain number of times and wait for the graph to be deleted. After which it is clear that after some time the memory will not return to its previous values.
Example: after loading the page, memory consumption was about 30-40 MB, after creating and deleting 15 graphs (one by one), the memory was already 105 MB

Thus, with each graph, memory leaks.

Also, to test and search for memory leaks, I used the three snapshot technique:
1) created, for example, 2-3 graphics one by one
2) took a snapshot
3) created an even number of charts (for example, 10 or 25)
4) took a snapshot
5) created one or two more graphs
6) took a snapshot

7) I opened the 3rd Snapshot and looked at the result of the objects distributed between Snapshots 1 and 2. Every time I see the same exact values of 10 or 25 or multiples of them.

Can you please look at the code, at creation and deletion, repeat this test to understand where this memory is leaking from.

Thanks in advance for your answer. I hope the problem will be found.

Zip file upload has been forbidden.
Link to GoogleDrive: https://drive.google.com/file/d/177QFurYZwnnd5Hp9a9jQV2z4nt6ULhkX/view?usp=sharing

I have a chart in the center of the page and the chart will resize according to the browser window size. When I expand the browser window, the chart will expand to fit the browser size. In this case, the chart grows downward gradually (with animation). How can I remove this animation effect when resizing the chart?

In case it’s related to my style. Here are my markup and style for reference:

//Markup

//Style
.contentPanel {
flex: 1 1 auto;
width: calc(100% – 335px);
max-height: calc(100vh – 108px);
display: flex;
flex-direction: column;
}

.chartContainer {
position: relative;
margin: 10px 0;
display: flex;
flex-direction: column;
flex: 1;
}

.scichart-root {
width: 100%;
height: 100%;
}

I am trying to implement the following functionality requested by our users:

Zoom:
– Only zoom the chart when using CTRL + MouseWheel key
– This is similar to how most browsers behave

Pan/Scroll:
– If no CTRL key is pressed, then pan/scroll
– This is similar to how most browsers behave

Given the above requirement, I started by creating custom modifier by extending YAxisDragModifier.

My code almost works:
– When using CTRL + Mouse Left & Drag, it Scales (zooms) — just like the user wants
– But using CTRL + Mouse Wheel does not do the same — it only Scales (Zooms).

I have uploaded the code at codesandbox.io:
https://codesandbox.io/s/amazing-shape-2ispt0?file=/src/customModifiers.ts

Note that I have not tried to implement this in ZoomPanModifier yet, but would be helpful if you could give me some pointers on getting this feature in there too.

I would appreciate any help I can get and thanks a bunch in advance.

Best Regards,
Sachin Patel.

I’m trying to add an AxisMarkerAnnotations for some line series on my chart.

I was following these questions answered here:
https://www.scichart.com/questions/js/adding-axis-markers-to-fastlinerenderableseries
https://www.scichart.com/questions/js/price-indicators-on-yaxis

I managed to render the axis marker for my series. Now I’m trying to the set the Y value of the marker annotation as the value where the line intersects the Y Axis.
I want the marker value to be the last value of the series, only if the xAxis.visibleRange.max > series.XdataRange.max.

The two attached images show the desired feature.
One shows the marker annotation with the Y1 being the one where the line intersects the YAxis.
The other shows the marker annotation with the Y1 being the last value of the line, because it is visible.

I read some answers here on the forum about using the HitTest API to do this, but I couldn’t make it work on my JS app

Hello everyone. A similar question has already been asked just below the forum, but there is no answer. I have dynamically added diagrams. However, I am interested in the possibility of adding buttons for closing and collapsing diagrams directly to the chart panel. I need the option to close any selected chart. How can this be implemented and written? Thank you.

stack overflow link : https://stackoverflow.com/questions/77781766/reactjs-sweep-line-optimizing-scichartjs-performance-reusing-wasmcontext-for-m

I have a performance problem with scichartjs, when initializing about 40 charts/surfaces the rendering state drops to 5-10 frames per second.

I think it might be related to the fact that I run the create function each time and not reusing the wasmContext maybe?
but I am not sure how to reuse the wasmContext or what is the best performance for this kind of type

demo : https://9669tv.csb.app/

(sorry for the low quality of the Giff due to 2 MB max size of upload)

this is my init function

export const initScichart = async (divElementId) => {
  SciChartSurface.UseCommunityLicense();
  //console.log(divElementId.id);
  const { sciChartSurface, wasmContext } = await SciChartSurface.create(
    divElementId,
    {
      theme: new SciChartJsNavyTheme(),
    }
  );

  sciChartSurface.xAxes.add(
    new NumericAxis(wasmContext, {
      visibleRange: new NumberRange(0, 5),
    })
  );
  sciChartSurface.yAxes.add(
    new NumericAxis(wasmContext, {
      autoRange: EAutoRange.Always,
    })
  );

  const xyDataSeries = new XyDataSeries(wasmContext, {
    fifoCapacity: 220_000, // set fifoCapacity. Requires scichart.js v3.2 or later
    fifoSweeping: true,
    fifoSweepingGap: 2_200,
    containsNaN: false,
    isSorted: true,
  });

  sciChartSurface.renderableSeries.add(
    new FastLineRenderableSeries(wasmContext, {
      dataSeries: xyDataSeries,
      strokeThickness: 1,
      stroke: "#50C7E0",
    })
  );

  xyDataSeries.sciChartSurfaceToDelete = sciChartSurface;

  return xyDataSeries;
};

the reason I need the charts on different surfaces is that I need to wrap them in SortableJS (to be able to drag them across the website)

Good afternoon. My team and I are looking at your library to create a depth chart, like here, but have run into a few problems:
1. if we have, for example, a “buySeries” array larger than the “sellSeries” array, the graph is not drawn very nicely.
2. the labels are not drawn correctly when we have too small numbers, I tried to solve the problem with xAxis.textFormatting = ‘0.#####’ or ‘0.00###’, but that doesn’t work for some reason.
3. If we want to add labels while hovering over the chart with showLabel = true , then we get 4 labels, two on yAxis. is it possible to make the buySeries label appear only on the left, for example, and the sellSeries label only on the right? (second screenshot)

I am trying to build my application with Electron. When the Electron application is run, it will open the UI in the browser (not opened with chromium). I created two Electron applications with same codes but with different versions of SciChart (i.e. version 2 and version 3). When I run with the Electron application with SciChart v2, the SciChart can be loaded properly. When when I run the Electron application with SciChart v3, I got error (please refer to the screenshot) and the SciChart cannot be loaded. I am not sure what’s wrong. Do you have any idea?

Please tell me, is it possible to make sure that there is no empty space between records on those days when there is no trading on the stock exchange? It appears that the X-axis is linear and not transactional. How can I make it transactional?

Hi,

I am facing a issue with RolloverModifier. I have multiple charts in single window. For some points the lines over the chart are missing.

Please find the attached images for some examples and the code for reproduce the issue. on the attachment you can see that the line on some chart is missing when mouse on left and right corner area of the chart

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?

Hello. I noticed that a canvas appears in the DOM tree, which completely duplicates the main chart, but it is set to display: none.

can i ask what it is used for? does it affect performance? and can i remove 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/support/solutions/articles/101000515345-scichart-js-domain-licensing-faq)

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?

Hi,

Gauges (linear and radial) are not part of scicharts components…
These controls are helpfull to do some dashboards

Is scichart can do that?
Examples exists?

circular samples
like https://apexcharts.com/javascript-chart-demos/radialbar-charts/
like https://nivo.rocks/radial-bar/
like https://antoniolago.github.io/react-gauge-component/
like https://codepen.io/naikus/pen/BzZoLL

linear samples
https://docs.anychart.com/Gauges/Linear_Gauge

Regards.

I am trying to subscribe to Visible Range changes on a DateTimeNumericAxis, it is not working, am I doing something wrong?

How to setup SciChart.js in React native frame work?