[Vuejs]-Onclick handler in custom exporting button in highcharts-vue fails with 'Cannot read property 'call' of undefined'

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The problem is that the onclick function is defined outside of your customButton object, and so Highcharts are not able to find event function to call your handler. Just need to move the function into the customButton, and then it should work well.

Live demo: https://jsfiddle.net/981nbkur/
API Reference: https://api.highcharts.com/highcharts/exporting.buttons.contextButton.onclick

Kind regards!

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