Category: JavaScript

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.

How to display data labels vertically and support Chinese，As shown in Fig

Hi,

I have added a data series and also a custom box annotation which is overlapping the data series.
But the question is I am trying to move the box annotation which drag and drop but have to clip on the data series as well.
May I know if is scichart js able to do so? Or best if I just convert it into svg and make it drag and drop will do?

Error from chart in div instrument_candle_chart_2
RuntimeError: call_indirect to a signature that does not match (evaluating ‘invoker(fn, thisWired, arg0Wired, arg1Wired, arg2Wired, arg3Wired, arg4Wired, arg5Wired, arg6Wired, arg7Wired, arg8Wired)

error here: OhlcSeriesDrawingProvider.prototype.draw:

this.nativeDrawingProvider.DrawPointsVec(nativeContext, xDrawValues, openValues, highValues, lowValues, closeValues, renderPassData.xCoordinateCalculator.nativeCalculator, renderPassData.yCoordinateCalculator.nativeCalculator, this.args);

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

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?

Hi there,

Wow this library has come along way in ten years. My question is related to interaction between RS and the legend that is rendered by the chartmodifier.

I declare the legend something like this during the initial bootstrapping of the plot view:

        const legend = new LegendModifier({placementDivId: "legend-goes-here", id:"legend"});
        sciChartSurface.chartModifiers.add(legend);

After that, I have a custom interface available for users to change things, which eventually results in visibility or color changes, updating an RS something like this:

        const thisRs = surface.renderableSeries.getById(`${s.fileId}-${s.name}`);
        if (thisRs) {
            thisRs.isVisible = s.isVisible;
            thisRs.stroke = s.visualInfo?.colorCode ?? "#FFFFFF";
        } 

These changes do not appear to be propagated to the legend despite the series on the plot changing. I guess my questions are:

1) What’s the expected behavior/is there something obvious I’m missing about the model?
2) Any suggestions?

It may very well be somewhere lost in my fairly complex React app, but I first wanted to confirm that I’m not missing something in the api.

Thanks!
Dan

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

Hello,

I found an issue with very high memory usage by the application. after some tests I found the problem and moved it to a separate example(https://codepen.io/PodaRocheK/pen/PoVmzvP?editors=0011). Please check this code and observe the memory usage on this page. With prolonged use (after 10 minutes), it is clear that more and more memory is used. After hours, the memory used may already be more than several gigabytes. Tell me what the problem is, maybe I’m doing something wrong. Maybe I’m somehow storing old data incorrectly or adding it incorrectly.

This example is not a working example, it has been sped up in order to quickly identify the problem. In our example, an unnecessary data update will occur once every few seconds and after a night of inactivity, the entire page will die. Please tell me what the problem is.

Thank you!

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.

The project is developed on SciChart JS.

The x axis is date time numeric and y axis is numeric.

There is a option for the user to select the x axis interval. The interval values are 5 Min, 10 Min, 15 Min, 30 Min, 1 Hour, 6 Hour, 12 Hour, Days, Weeks, Months & Years.

When the user the selects a interval in the select option, the x axis should be updated with the selected interval.

For Example, If the user selects the 5 Min in the select option, then the x axis interval should be 5 Min.

For 5 Min X Axis Interval

16-Jan-2023 07:00
16-Jan-2023 07:05
16-Jan-2023 07:10
16-Jan-2023 07:15
16-Jan-2023 07:20
16-Jan-2023 07:25
16-Jan-2023 07:30

For 1 Hour X Axis Interval

16-Jan-2023 07:00
16-Jan-2023 08:00
16-Jan-2023 09:00
16-Jan-2023 10:00
16-Jan-2023 11:00
16-Jan-2023 12:00
16-Jan-2023 13:00
16-Jan-2023 14:00

So let me know how to change the interval in the x axis (date time numeric) based on the selection.

I have attached the zip file which contains the HTML file.

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

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!

Greetings,
i have three Series in a SciChart.js (Community-Version) Surface.
The Legend i added shows me all three of them and their names and checkboxes do hide or show the series.

Here is my problem: Is there a way to hide one Series (a FastCandlestickRenderableSeries) from the Legend? I only want to show the other two Series (FastLinerenderableSeries).

Somethin like a Parameter “showInLegend: false,”? I did not find something like this in the documentation(https://www.scichart.com/documentation/js/current/typedoc/classes/legendmodifier.html).

Thank you

Hi Folks,

Wanted to ensure I’m working in the right direction here. Requirement is to add inline series labels on the plot surface. It’s an awkward requirement at times, but it keeps coming up with because other providers do this sometimes.

I’ve been playing with the examples of using data labels ( https://github.com/ABTSoftware/SciChart.JS.Examples/blob/master/Examples/src/components/Examples/Charts2D/TooltipsAndHittest/UsingVerticalSliceModifier/index.tsx ).

This might work. It’s a little strange since I only need to show at most one label per series. So I use the data label provider I assume and have to manually space them along the index range.

The only alternative I’m aware of is the annotations api, which of course is quite robust and probably a little too fancy for this case.

Appreciate any thoughts on the approach here — thanks!

EDIT: Attached very contrived example. The idea is to supply a label to name the series inline (apparently a legend is not sufficient), but in a way that is reasonably useful visually (similar to the spacing capabilities in the data labels api). The text would be some piece of metadata that is derived from the series (or at least has a 1:1 relationship with the series).

I have a use case for a chart, that is a heatmap, which may also contain multiple series drawn on top, with multiple internal axis as well.
I can’t transform the data I receive, because that would be too slow, and it needs to maintain a speedy feeling, even when appending more data.

For this reason, when building the chart, I just flip the axis. The bottom axis is the Y axis, and the left axis it the X axis.

The multiple series that can be added (XyDataSeries), provide one extra axis each, and use one of the main axis.
We can think of them as horizontal or vertical series, depending if they use the main X axis, or the main Y axis.

When hovering over the chart, I want to show a tooltip, that shows for each series, their own axis value.

The issue — The normal CursorModifier, can’t correctly present a tooltip, for this case of mixed horizontal/vertical series. I’m not sure if there are configurations I’m missing, or if it is an actual uncovered edge case, hoping to get an answer on this.

To show what the issue is, and how I’m currently fixing it, please have a look at the codepen I made -> https://codepen.io/jrfv/full/zYMjEzP

Any tips on this, is it something scichart will fix eventually?

Hello, how do I remove the shadow from tooltips, generated by the VerticalSliceModifier?

Thanks!

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.

Posting again because on latest version also the same issue not resolved.
https://www.scichart.com/questions/js/rollovermodifier-in-multiple-chart-line-missing-on-some-areas

Hello All,

I was trying to set the visual range property on a numeric axis but i get the error that the “equals” is not a function of NumerixAxis. This happens when i try the following.

export function setXAxisVisibleRange(element, visibleRange) {
     const { sciChartSurface } = resolveContext(element);
     var axis = sciChartSurface.xAxes.get(0);
     axis.visibleRange = visibleRange; **//error here**
}

attached is a picture of a more detailed error. Ultimately what I am trying to do is to sync up the visual range of two charts x axis like in the following tutorial

https://www.scichart.com/documentation/js/current/webframe.html#Tutorial%2009%20-%20Linking%20Multiple%20Charts.html

Thanks for your help in advance.

UPDATE

So my issue was that I had a serialization issue with the NumberRange class. I can now sync up the charts just like in the tutorial. The problem now is that if I scroll or zoom very fast eventually the charts start to flicker in an endless loop. Has anyone ever seen this behavior? One thing I notice is that the min and max value have over 10 decimal points.

Here is a quick printout of the value change events between the two charts when the flickering starts.

Any ideas?

–> CH.1 Min: 0.532180460735786 Max: 3.457511660735786
–> CH.2 Min: -0.17488026755852848 Max: 4.339519732441472
–> CH.2 Min: 0.025927491638795958 Max: 4.088887491638796
–> CH.2 Min: 0.38738145819397996 Max: 3.63774945819398
–> CH.1 Min: 0.5319630448160535 Max: 3.4572942448160537
–> CH.2 Min: 0.532180460735786 Max: 3.457511660735786
–> CH.1 Min: -0.17488026755852848 Max: 4.339519732441472
–> CH.1 Min: 0.025927491638795958 Max: 4.088887491638796
–> CH.1 Min: 0.38738145819397996 Max: 3.63774945819398
–> CH.2 Min: 0.5319630448160535 Max: 3.4572942448160537
–> CH.1 Min: 0.532180460735786 Max: 3.457511660735786
–> CH.2 Min: -0.17488026755852848 Max: 4.339519732441472
–> CH.2 Min: 0.025927491638795958 Max: 4.088887491638796
–> CH.2 Min: 0.38738145819397996 Max: 3.63774945819398
–> CH.1 Min: 0.5319630448160535 Max: 3.4572942448160537
–> CH.2 Min: 0.532180460735786 Max: 3.457511660735786
–> CH.1 Min: -0.17488026755852848 Max: 4.339519732441472
–> CH.1 Min: 0.025927491638795958 Max: 4.088887491638796
–> CH.1 Min: 0.38738145819397996 Max: 3.63774945819398
–> CH.2 Min: 0.5319630448160535 Max: 3.4572942448160537
–> CH.1 Min: 0.532180460735786 Max: 3.457511660735786
–> CH.2 Min: -0.17488026755852848 Max: 4.339519732441472
–> CH.2 Min: 0.025927491638795958 Max: 4.088887491638796
–> CH.2 Min: 0.38738145819397996 Max: 3.63774945819398
–> CH.1 Min: 0.5319630448160535 Max: 3.4572942448160537
–> CH.2 Min: 0.532180460735786 Max: 3.457511660735786
–> CH.1 Min: -0.17488026755852848 Max: 4.339519732441472
–> CH.1 Min: 0.025927491638795958 Max: 4.088887491638796
–> CH.1 Min: 0.38738145819397996 Max: 3.63774945819398
–> CH.2 Min: 0.5319630448160535 Max: 3.4572942448160537
–> CH.1 Min: 0.532180460735786 Max: 3.457511660735786
–> CH.2 Min: -0.17488026755852848 Max: 4.339519732441472

When hardware acceleration is not enabled from the client side i am getting the follwong error in the console and the chart becomes empty.
Can we have a caetain fallback ui for this error so that when hardware acceleration is disabled we can show some error in the client side instead of frozen screen

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?