Comments (2)
By avoiding the popular arrow function syntax in ES6 components and using the good old function() {}
syntax instead, the problem was solved. The arrow functions change the game, because within these called functions it turns out that this
is not reduced to the called context of the function, but that the context extends globally till the class level.
Solution:
private drawPoints(points: Point[]) {
points.forEach(point => {
this.svg.append('circle')
.attr('r', point.color ? 20 : 10)
.attr('cx', point.x)
.attr('cy', point.y)
.attr('fill', point.color ? point.color : 'lightgray')
.attr('stroke-width', !point.color ? 2 : 0)
.attr('stroke', !point.color ? 'gray' : '')
.call(Drag.drag()
.on('drag', function() {
console.log(this);
}));
});
}
Further reading:
[...] and ES2015 [ES6] introduced arrow functions which don't provide their own this binding (it retains the this value of the enclosing lexical context).
rwaldron, abasao, martian2049 et. al, this, MDN web docs
from d3-drag.
@nextlevelshit thank you so much for posting your solution and explanation here. You just saved me a ton of debugging time.
from d3-drag.
Related Issues (20)
- Possible typo in README HOT 2
- What are the perposes of functions yesdrag and nodrag?
- Drag event on Chrome 72 HOT 3
- d3 mouseup event not firing HOT 1
- Drag Event Issue on Windows Chrome 74, related to solution for #47 HOT 1
- The default filter should return false if event.ctrlKey. HOT 5
- drag start event is don't send when Ctrl-key is press HOT 1
- drag.on("init") ? HOT 7
- Click event not firing if drag enables with simulation HOT 1
- Non-cancelable event HOT 3
- remove drag.container? HOT 1
- Use native events (*element*.dispatchEvent) instead of d3-dispatch? HOT 1
- remove dragEvent.on?
- d3.event is not available in version 6.1.1 HOT 1
- DragEvent missing event.currentTarget for arrow function node selection HOT 1
- Make event listeners non-passive. HOT 2
- d3.drag() causes error in testing mousedown event via jsdom HOT 4
- d3.pointer() could use event.touches[0] HOT 2
- Add event.currentTarget
- Support d3.drag in testing environments
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