在Firefox中显示"ReferenceError:未定义事件"的D3事件 [英] D3 event showing 'ReferenceError: event is not defined' in Firefox

问题描述

我正在d3地图中使用鼠标滚轮缩放.以下代码正在使用.

I am using mouse wheel zoom in my d3 Map.Following Code am using.

.on("wheel.zoom", function() {
    var currScale = projection41039.scale();
    var newScale = currScale - 1 * event.deltaY;
    if (newScale >= 150) {
        var currTranslate = projection41039.translate();
        var coords = projection41039.invert([event.offsetX, event.offsetY]);
        projection41039.scale(newScale);
        var newPos = projection41039(coords);
        projection41039.translate([currTranslate[0] + (event.offsetX - newPos[0]),
            currTranslate[1] + (event.offsetY - newPos[1])
        ]);
        updateContents();
    }
})

这在Chrome上正常运行，但在Firefox中引发错误:

This works fine for Chrome, but throws an error in Firefox:

ReferenceError:未定义事件

ReferenceError: event is not defined

推荐答案

此处的问题是Chrome浏览器遵循

The issue here is that Chrome follows the Internet Explorer feature of Window.event, while Firefox doesn't:

例如，给定一个按钮或任何其他元素，以下代码段将在Chrome上运行，但不适用于Firefox:

For instance, given a button or any other element, the following snippet will work on Chrome, but not on Firefox:

d3.select("button").on("click", function() {
  console.log(event)
})

在这里尝试: https://jsfiddle.net/b9h4ntn0/(我通常使用堆栈片段，但该代码段将在该特定示例中冻结).

Try it here: https://jsfiddle.net/b9h4ntn0/ (I normally use Stack Snippets, but the snippet will freeze in that particular example)

解决方案

使用d3.event.这样，您就不必依赖Window.event:

Use d3.event. That way, you don't rely on Window.event:

d3.select("button").on("click", function() {
  console.log(d3.event)
})

以下代码在Chrome和Firefox上均可使用: https://jsfiddle.net/qj787zmj/

The following code works both on Chrome and Firefox: https://jsfiddle.net/qj787zmj/

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