React - React.createElement：type不应为null，undefined，boolean

Question

我有新的反应和渲染元素的问题。我有一个热图组件，我从外部脚本获取代码，并从我的主组件调用它。看起来我错过了一些要传递的参数或错误的方式我返回元素。

我有一个热图组件：

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var React = require("react");
var ReactDOM = require("react-dom");
var AmCharts = require("amcharts3-react");

// Generate random data
function generateData() {
  var firstDate = new Date();

  var dataProvider = [];

  for (var i = 0; i < 100; ++i) {
    var date = new Date(firstDate.getTime());

    date.setDate(i);

    dataProvider.push({
      date: date,
      value: Math.floor(Math.random() * 100)
    });
  }

  return dataProvider;
}


// Component which contains the dynamic state for the chart
var Chart = React.createClass({
  getInitialState: function () {
    return {
      dataProvider: generateData(),
      timer: null
    };
  },

  componentDidMount: function () {
    var self = this;

    self.setState({
      // Update the chart dataProvider every 3 seconds
      timer: setInterval(function () {
        self.setState({
          dataProvider: generateData()
        });
      }, 3000)
    });
  },

  componentWillUnmount: function () {
    clearInterval(this.state.timer);
  },

  render: function () {
    // Render the chart
    return React.createElement(AmCharts, {
      "path": "node_modules/amcharts3/amcharts",
      "type": "serial",
      "theme": "light",
      "marginRight": 40,
      "marginLeft": 40,
      "autoMarginOffset": 20,
      "mouseWheelZoomEnabled": true,
      "valueAxes": [{
        "id": "v1",
        "axisAlpha": 0,
        "position": "left",
        "ignoreAxisWidth": true
      }],
      "balloon": {
        "borderThickness": 1,
        "shadowAlpha": 0
      },
      "graphs": [{
        "id": "g1",
        "balloon":{
          "drop": true,
          "adjustBorderColor": false,
          "color":"#ffffff"
        },
        "bullet": "round",
        "bulletBorderAlpha": 1,
        "bulletColor": "#FFFFFF",
        "bulletSize": 5,
        "hideBulletsCount": 50,
        "lineThickness": 2,
        "title": "red line",
        "useLineColorForBulletBorder": true,
        "valueField": "value",
        "balloonText": "<span style='font-size:18px;'>[[value]]</span>"
      }],
      "chartScrollbar": {
        "graph": "g1",
        "oppositeAxis": false,
        "offset":30,
        "scrollbarHeight": 80,
        "backgroundAlpha": 0,
        "selectedBackgroundAlpha": 0.1,
        "selectedBackgroundColor": "#888888",
        "graphFillAlpha": 0,
        "graphLineAlpha": 0.5,
        "selectedGraphFillAlpha": 0,
        "selectedGraphLineAlpha": 1,
        "autoGridCount": true,
        "color":"#AAAAAA"
      },
      "chartCursor": {
        "pan": true,
        "valueLineEnabled": true,
        "valueLineBalloonEnabled": true,
        "cursorAlpha":1,
        "cursorColor":"#258cbb",
        "limitToGraph":"g1",
        "valueLineAlpha":0.2,
        "valueZoomable": true
      },
      "valueScrollbar":{
        "oppositeAxis": false,
        "offset":50,
        "scrollbarHeight":10
      },
      "categoryField": "date",
      "categoryAxis": {
        "parseDates": true,
        "dashLength": 1,
        "minorGridEnabled": true
      },
      "dataProvider": this.state.dataProvider
    });
  }
});

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我是从我的主要组件调用它：

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import React from "react"
import Heatmap from "../../Elements/AmCharts/Heatmap"

...

export default class Stats extends React.Component {

  render() {
      return (
        ....
        <Heatmap />
        ....
      )
  }
}

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我收到错误warning.js:45 Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components). Check the render method of Stats.

以及

Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object. Check the render method of Stats.

有没有办法解决它？

Answer 1

您需要导出组件：

export default Chart = React.createClass({