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

Question

我正在使用d3.v2.js渲染饼图和一个表盘(位于中心)以指向饼图的选定组件.拨号代码如下

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()来将刻度盘更改为指向我单击的组件. 问题是: d3在旋转时在createDialIndicator()中抛出以下错误,但在updateDialIndicator()中没有.我可以知道会出现什么问题吗？

错误:属性变换的值无效="null"

Answer 1

问题是没有初始transform属性设置用作转换的开始.这是错误消息的含义.要修复,只需添加初始旋转:

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