D3 鼠标事件——点击&拖尾 [英] D3 Mouse Events -- Click & DragEnd

问题描述

在 D3 中，如果您定义了这样的拖动功能:

In D3, if you defined a drag function like this:

var drag = d3.behavior.drag()
        .on("drag", function () {alert("drag")})
        .on("dragend", function () {alert("dragEnd")});

你真的不能做以下事情:

You really cannot do the following:

d3.select("#text1")
.on("click", function(d,i) {alert("clicked")})
.call(drag);

原因是在dragend"将触发之后点击将被触发.我认为应该有一个单独的点击事件，因为我发现 dragend 和 click 之间存在巨大差异.

Reason is that the click will get fired after that the "dragend" will fire . In my opinion there should be a separate event for clicking because I see a huge difference between dragend and click.

要区分 SVG 元素中的单击和拖动事件的结束，有什么解决方案?

To differentiate between clicking and end of a dragging event in an SVG element, what would be the solution?

推荐答案

文档对此有一些明确的例子:

The documentation has some explicit examples for this:

在可拖动元素上注册自己的点击监听器时，可以通过如下方式检查点击事件是否被抑制:

When registering your own click listener on draggable elements, you can check whether the click event was suppressed as follows:

selection.on("click", function() {
  if (d3.event.defaultPrevented) return; // click suppressed
  console.log("clicked!");
});

这与紧随其后的 stopPropagation() 示例一起，允许您控制触发和处理哪些事件.

This, along with the stopPropagation() example immediately afterwards, allows you to control which events are fired and handled.

需要明确的是，区分拖动结束和点击事件完全取决于您.最简单的方法可能是在拖动发生时设置一个标志，并使用该标志来确定是否应该处理 dragend 或 click 事件.

To be clear, differentiating between a drag end and click event is entirely down to you. The easiest way to do this is probably to set a flag when dragging takes place and use that flag to determine whether a dragend or click event should be handled.

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