Tooltips for Images in Vega Charts

As a developer skilled in d3, I am navigating the world of VEGA charts and seeking guidance on how to incorporate an image in a tooltip. Do you have any suggestions for me?

For example, considering this particular scenario:

If we assume there is an additional variable in the data containing a URL:

{"category": "A", "amount": 28, "image_url": "http://www.mywebsite.com/myimage.png"}

Implementing this feature in d3 is straightforward, but I am encountering some difficulty achieving the same in Vega. Any assistance would be greatly valued.

javascriptvega

Answer №1

If you happen to stumble upon the same issue, fear not because I have discovered a solution!

The key is to utilize the view within the vegaEmbed function.

vegaEmbed('#vis', spec).then(function(result) {
     // access view as result.view
     var view = result.view;
     
     view.addEventListener('mouseover', function(event, item) {

           ////catch the data here:  item.datum.my_field_name.
           ////now you can select and populate your tooltip div

     });


}).catch(console.error);

After implementing this, feel free to create a div tooltip in the usual manner outside of this function call and select and populate it using either the id or class.

Mastering this technique makes everything seem simple!

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