d3.js抛出错误:< g>的值无效属性transform ＝"null".在transition()上

问题描述

我正在使用 d3.v2.js 绘制饼图，并使用一个拨盘(位于中间)指向饼图的选定组件.拨号代码如下

i'm using d3.v2.js to render pie chart and a dial (in center) to point to the selected component of the pie. The code for dial is as below

function createDialIndicator(dialerData, subComponentId, subComponentsCount, group){
    var offsetAngle = (360/subComponentsCount)/2;
    var dialAngle = ((360/subComponentsCount)*(parseInt(subComponentId.charAt(subComponentId.length-1))))-offsetAngle;
    var dialGroup = group.append("g")
     .attr("class","dialGroup");
    dialGroup.append("path")
     .attr("class","dial")
     .attr("d",dialerData)
     .attr("fill","gold");
    d3.selectAll(".dialGroup")
     .transition()
     .duration(1000)
     .attr("transform", "rotate(" + dialAngle + ")");
}
function updateDialIndicator(subComponentId, subComponentsCount){
    var offsetAngle = (360/subComponentsCount)/2;
    var dialAngle = ((360/subComponentsCount)*(parseInt(subComponentId.charAt(subComponentId.length-1))))-offsetAngle;
    d3.selectAll(".dialGroup")
     .transition()
     .duration(1000)
     .attr("transform", "rotate(" + dialAngle + ")");
}

我在初始渲染和updateDialIndicator()上调用createDialIndicator()以将刻度盘更改为指向我单击的组件.问题是:d3旋转时在createDialIndicator()中引发以下错误，但在updateDialIndicator()中未引发以下错误.我可以知道会有什么问题吗?

I'm calling createDialIndicator() on initial render and updateDialIndicator() to change the dial to point to the component I click.The issue is:d3 is throwing following error in createDialIndicator() on rotate but not in updateDialIndicator(). May I know what would be the issue?

推荐答案

问题是没有设置初始的transform属性来用作过渡的开始.这就是错误消息的含义.要解决此问题，只需添加一个初始轮播:

The problem is that there's no initial transform attribute set to use as a start for the transition. This is what the error message means. To fix, simply add an initial rotation:

d3.selectAll(".dialGroup")
 .attr("transform", "rotate(0)")
 .transition()
 .duration(1000)
 .attr("transform", "rotate(" + dialAngle + ")");

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