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我在做一个反映动态数量变化的饼图。我可以统计项目的数量，但是在更新项目之后，我将存储数据的重点放在饼图中。更新项目并动态更改饼图。 React.js + D3
我提到了这个问题：How to change states for making dynamic pie chart?
我遵循同样的方式，但我的数据是不是在我的饼图更新。
饼图的图像
有5个问题的类别。项目
图片
用户可以添加和删除项目。项目的数量应该动态地反映在饼图中。我现在只做了问题1类。
代码
export default class List extends React.Component {
constructor(props){
super(props);
this.state={
questionItem,
pieData : [{label: "question1", value: 4}, {label: "question2", value: 10}, {label: "question3", value: 25 },{label: "question4", value: 5 },{label: "question5", value: 12 }]
}
}
createItem(item){
this.state.questionItem.unshift({
item : item,
});
this.setState({
questionItem : this.state.questionItem
});
}
findItem(item) {
return this.state.questionItem.filter((element) => element.item === item)[0];
}
toggleComplete(item){
let selectedItem = this.findItem(item);
selectedItem.completed = !selectedItem.completed;
this.setState({ questionItem : this.state.questionItem });
}
saveItem(oldItem, newItem) {
let selectedItem = this.findItem(oldItem);
selectedItem.item = newItem;
let length1 = questionItem.length;
var array = [
{label : "question1" ,value : length1 },
{label : "question2" , value : length1 },
{label : "question3" , value : length1 },
{label : "question4" , value : length1 },
{label : "question5" , value : length1 } ]
this.setState({ questionItem : this.state.questionItem,
pieData : array });
}
deleteItem(item) {
let index = this.state.questionItem.map(element => element.item).indexOf(item);
this.state.questionItem.splice(index, 1);
this.setState({ questionItem : this.state.questionItem });
}
render() {
const { questionItem } = this.state
return (
<div>
<Chart data = { this.state.pieData} />
<div className="list" style={{"display" : "flex"}}>
<div className="titleElement" style={{"flex": "1", "backgroundColor" : "orange"}}>Advice + FAQ </div>
<div style={{"flex": "5", "display": "flex", "flex-direction": "column"}}>
<QuestionList questionItem={this.state.questionItem} deleteItem={this.deleteItem.bind(this)} saveItem={this.saveItem.bind(this)} toggleComplete={this.toggleComplete.bind(this)} />
<CreateItem questionItem={this.state.questionItem} createItem={this.createItem.bind(this)} />
</div>
</div>
</div>);
}
}
class Chart extends React.Component {
render(){
var PieChart = rd3.PieChart
var pieData = [{label: "question1", value: 4}, {label: "question2", value: 10}, {label: "question3", value: 25 },{label: "question4", value: 5 },{label: "question5", value: 12 }];
return (
<PieChart
data={this.props.data}
width={450}
height={400}
radius={110}
innerRadius={20}
sectorBorderColor="white"
title="Pie Chart" />
)}
}
感谢您抽出时间来阅读我的问题。