javascriptd3drag 030quotCannot r

javascript - d3-drag 0.3.0 - "Cannot read property 'button' of null" - Stack Overflow
I'm trying to use d3-drag with a canvas a such:select(canvas).call(drag().container(canvas).subje
javascriptd3drag 030quotCannot read property 39button39 of nullquotStack Overflow
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