javascript - How do I ensure robust notification of mouseup? -

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the goal reliably notified of mouseup events. concrete example, when left-click cloud should turn red , when release button should return blue.

this fiddle works:

canvas.addeventlistener("mousedown", function(e) {     if (e.button === 0) {         drawshape("#ff69b4", "red");     } }); canvas.addeventlistener("mouseup", function(e) {     if (e.button === 0) {         drawshape("#8ed6ff", "blue");     } }); window.addeventlistener("mouseup", function(e) {     if (e.button === 0) {         drawshape("#8ed6ff", "blue");     } }, true);

https://jsfiddle.net/f1x6vc0c/1/

the great evil remains context menu. if click cloud, drag anywhere like, , right-click context menu , release left mouse button while context menu present mouseup forever lost. sure, disable context menu, on pages control - note same aberrant behavior occurs if activate context-menu in other app outside browser window. so, how ensure notified in case? in cross-browser manner?

(feel free ignore ie prior 9 , elder browsers)


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