Steps to integrate the Save as PNG functionality in Vega using a customized menu

As I develop a data dashboard with Vega for visualizing outputs, I decided to customize the menu system by removing the actions dropdown. However, I still want to incorporate the "Save as PNG" option from the original dropdown (as shown in the image below) into my custom menu. This should be relatively simple since the image creation architecture already exists and works well. My main challenge lies in referencing those actions separately from the original menu.

Is there a way to link the functionality of saving as PNG to a button outside of the Vega actions dropdown?

https://i.sstatic.net/hgoFA.png

javascriptdata-visualizationvega

Answer â„–1

The Vega visualization API includes a method called toImageURL(), which allows users to easily download the chart image as a PNG file.

Learn more about image export here

In a dashboard, there might be multiple instances of Vega view objects for different charts. Below is an example JavaScript function that takes the Vega view object and desired download filename as arguments:

function vegaDownloadChartImage(vegaView, downloadFileName){
  vegaView.toImageURL('png').then(function(url) {
    var link = document.createElement('a');
    link.setAttribute('href', url);
    link.setAttribute('target', '_blank');
    link.setAttribute('download', downloadFileName);
    link.dispatchEvent(new MouseEvent('click'));
  }).catch(function(error) { /* handle errors */ });
}

An example HTML button can be used by users to download an image file named 'myVegaChart1.png':

<button onclick="vegaDownloadChartImage(view_1, 'myVegaChart1')">Download PNG file</button>

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