Category: JavaScript

Hello,

I need to customize the text for some points on a XyScatterRenderableSeries graph. The problem is that the dataLabelProvider available for XyScatterRenderableSeries is BaseDataLabelProvider, but it doesn’t have a metaDataSelector method and I can’t do it with it. Interestingly, using LineSeriesDataLabelProvider I was able to add text for the points I needed using metadata, but another problem arose. In this case, if there is only one point on the graph, the text will not be drawn.

Here is a small example of how text is drawn for different numbers of points. https://codepen.io/PodaRocheK/pen/jOXYGMJ?editors=0011

Can you advise me on how to display text near points more correctly in the case when I use XyScatterRenderableSeries and often this text should disappear or appear near some points. Thanks a lot!

Hi,

EDataLabelSkipMode Customization is possible with some time range limit?
When i checked the documentation saw the options to skip the label for overlaping. Is it possible can add some index to skip the values. Eg: for Time chart One value is displayed in the chart at 10:30:00. So if i add some index value to skip the next 1 min data. So based on skip index next available value can ba displayed in chart. (10:31:00 or next available value). Can you implement this option to skip ?

Hi!
Currently, I’m using Axis Layout – vertically stacked axes。When I use vertically stacked axes, click on a certain area, can I get on that axis? It’s from click on a certain area, not the series. I know the series can it.
can you give me some help?

Good afternoon. Please tell me how can I change the Z index of the annotations so that the box annotation can overlap the text. Now no matter how I try to do it, the text is always above the rectangles. Does the JS version have some layers with annotations that can be changed by they Z like in this question – https://www.scichart.com/questions/wpf/changing-an-annotations-z-index

Unfortunately, I did not find this functionality in the JS version.

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?

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

Hi,
the Tooltip from the rolloverModifier shows for the Open-Values the Label “Open”.

I would like to be able to change that. There might be serveral reasons for that. Maybe the shown data are not “openValues” or the word “open” needs to be translated into another language.

I managed to edit the title of a FastCandlestickRenderableSeries by setting a title and get it into the variable like this:

rolloverTitle = newtitle;
renderableSeries0.rolloverModifierProps.tooltipTitle = rolloverTitle;

unfortunately i did not find a way to set the name/label for the open-,low-,close-, or high-values of this Series.

Can someone give ma a hint how to do this?

In our app we have a feature by which user can add indicators. These indicators can consist of 2 or a maximum of 4 lines.

We don’t want to render svg tooltips(which setted up by the default) with data for each line, instead of that we get point data and pass it to our app inner service that can render indicator legend.

To prevent default tooltips from being displayed we set for each renderable series of an indicator the following values.

rolloverModifierProps.width = 0; rolloverModifierProps.height = 0;

But of course tooltips are still rendered in the DOM and this leads to performance issues when we have 3 or more indicators of this type.

My question is the following

How we can render only circles svg for rollover modifier and completely dont render svg for tooltips in the DOM?

This is what the indicators look like

Hi,

I am facing a issue with latest version of SciChart. Because of this type error not able to build the project. Can you check this error.

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.

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

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,
tell me please, how can I add such indicators on yAxis. Maybe you have some example on sandbox for JS.

Thank you!

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?

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?

Hi,

I am creating an application where, we fetch data and display it in multiple heatmaps. The user can manipulate the heatmaps with changing colormap or changing ranges on the colormap.

Data from these multiple heatmaps is composited to another chart for visualization.

I was able to get a reference to the series, but adding the series to another chart errors with a message:

Invalid operation in sciChartSurface.attachSeries, this series has already been attached to a SciChartSurface. Please detach it from a SciChartSurface before attaching to another
at BaseRenderableSeries.onAttach (BaseRenderableSeries.js:634:1)
at __webpack_modules__../node_modules/scichart/Charting/Visuals/SciChartSurface.js.SciChartSurface.attachSeries (SciChartSurface.js:1385:1)

of course this means we cannot attach the same series to two different charts, but is there a way around this such as deepcloning?

renderable series: attached image

sample code: attached image

I’m trying to add a axis label/marker to the yAxis of my chart.
This label should follow the intersection between a FastLineRenderableSeries (that i’m using to render a moving average filtered dataSeries) and the yAxis.

I tried to extend the “draw” method of the FastLineRenderableSeries to draw a label ontop of the yAXis, using the “drawModifiersAxisLabel” helper function. Like:

class CustomFastLineRenderableSeries extends FastLineRenderableSeries {
draw(renderContext: WebGlRenderContext2D, renderPassData: RenderPassData) {
    super.draw(renderContext, renderPassData)
    const yAxis = getYAxis(this.parentSurface);
    drawModifiersAxisLabel(
        yAxis,
        renderContext,
        150, // testing values
        "#00ff00", // testing values
        "#00ff00", // testing values
    );
}

but the label don’t get drawn.

The attached image shows the desired feature (image from another charting lib)

How can I implement this?

Hi Scichart Team.

I am working on the MouseWheelZoomModifier (EActionType.Pan).
But my users are using a trackpad (apple magic trackpad).
Currently, they are using 2 fingers and move up or down (vertically) to pan the chart. But they are asked to pan the chart by using 2 fingers and move left or right (horizontally) instead.

Do we have any setting for MouseWheelZoomModifier that help me pan the chart by that way?

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

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.

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?

Hello,

When annotations and the rollover modifiers are displayed on the very left side of a chart they align with the center of the candlesticks on the chart. However, as they get displayed toward the right side of the chart they get more and more offset to the right side of the candlestick.

Can anyone point me in the right direction to figure out how to fix this issue seemingly with my xAxis?

See attached screenshots,

Hello,

We have a heatmap where we can zoom in using the MouseWheelZoomModifier. Essentially we want to stop zooming at a certain visibleRange level and we cannot achieve it. Currently we have a heatmap that’s about 1500 pixels in width (with 1500 datapoints, 1-to-1), but the user can zoom so far you essentially see just 1 data point spread over the 1500 pixels.

We want to be able to zoom, but up to a certain limit, let’s say 100 datapoints visible. When visibleRange.max – visibleRange.min <= 100 we want to stop zooming.

We’ve tried suspendUpdates() and manually setting the visibleRange, but this doesn’t produce the desired results because suspendUpdates stops everything (including zooming out again) and resetting visibleRange solves it for a second, but the user is able to zoom in again. We also tried a custom mouseWheelModifier class and just removing the zoom in functionality at the treshold but that does not seem to work because scichart gives an error of having different mouseWheelModifiers.

I hope that this problem was expressed sufficiently. Please let us know if you have any questions.

Hello All,

Is there a way to have a cursor modifier display on a mouse left/center/right click instead of automatically showing when the mouse is over the chart? I tried setting the ExecuteOn property but had no effect.

Thanks in advance,
Sergio.

I am using a axis line chart from the js scichart. I want to change the font size of a legend. How do I change the font size of a legend?

Currently, I am creating a line chart and appending a lot of fetched data to the data series. The problem is that I have to recreate the chart when I move to another page that is using the same chart from the previous page. Therefore, I have to fetch the data and append it to the chart data series again.

Is there any way to reuse the chart itself without recreating the whole chart on another page?