Vue.js Uncaught TypeError: _vueChartjs.Line.extend is not a function

Question

刚开始 Vue.js 和 webpack。我正在尝试将 vue-chartjs 功能添加到我的项目中。我收到以下错误：

Uncaught TypeError: _vueChartjs.Line.extend is not a function
at Object.defineProperty.value (..\..\CommodityChart.vue:5)
at __webpack_require__ (bootstrap 7040a42393b737f78245:659)
at fn (bootstrap 7040a42393b737f78245:85)
at Object.<anonymous> (CommodityChart.vue:3)
at __webpack_require__ (bootstrap 7040a42393b737f78245:659)
at fn (bootstrap 7040a42393b737f78245:85)
at Object.defineProperty.value (..\..\fetch-data.vue:36)
at __webpack_require__ (bootstrap 7040a42393b737f78245:659)
at fn (bootstrap 7040a42393b737f78245:85)
at Object.<anonymous> (fetch-data.vue:7)

在我的 package.json

"dependencies": {
"axios": "^0.15.3",
"bootstrap-vue": "^1.0.0-beta.9",
"chart.js": "^2.7.1",
"core-js": "^2.4.1",
"font-awesome": "^4.6.3",
"vue": "^2.1.8",
"vue-chartjs": "^3.0.0",
"vue-router": "^2.1.1",
"vue-server-renderer": "^2.1.8",
"vue-template-compiler": "^2.1.8",
"vuex": "^2.1.1",
"vuex-router-sync": "^4.0.1"

},

我可以在我的 node_modules 文件夹中看到依赖项（chart.js 和 vue-chartjs）。

我抛出错误的 .vue 文件如下所示：

<script>
  //Importing Line class from the vue-chartjs wrapper
  import { Line } from 'vue-chartjs'
  //Exporting this so it can be used in other components
  export default Line.extend({
    data () {
      return {
        datacollection: {
        //Data to be represented on x-axis
          labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
          datasets: [
            {
              label: 'Data One',
              backgroundColor: '#f87979',
              pointBackgroundColor: 'white',
              borderWidth: 1,
              pointBorderColor: '#249EBF',
              //Data to be represented on y-axis
              data: [40, 20, 30, 50, 90, 10, 20, 40, 50, 70, 90, 100]
            }
          ]
        },
        //Chart.js options that controls the appearance of the chart
        options: {
          scales: {
            yAxes: [{
              ticks: {
                beginAtZero: true
              },
              gridLines: {
                display: true
              }
            }],
            xAxes: [ {
              gridLines: {
                display: false
              }
            }]
          },
          legend: {
            display: true
          },
          responsive: true,
          maintainAspectRatio: false
        }
      }
    },
    mounted () {
    //renderChart function renders the chart with the datacollection and options object.
      this.renderChart(this.datacollection, this.options)
    }
  })
</script>

我是否需要 import/reference 入口 js 文件中其他地方的图表库？ Webpack 参考资料？项目在没有 chart.vue 文件的情况下工作正常。

Answer 1

vue-chartjs最新版本(3.0.0)修改了创建图表组件的语法，因此出现错误。

根据新语法，您应该按如下方式创建图表组件：

import { Line } from 'vue-chartjs';

export default {
   extends: Line,
   data() {
      return {
         datacollection: {
            //Data to be represented on x-axis
            labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
            datasets: [{
               label: 'Data One',
               backgroundColor: '#f87979',
               pointBackgroundColor: 'white',
               borderWidth: 1,
               pointBorderColor: '#249EBF',
               //Data to be represented on y-axis
               data: [40, 20, 30, 50, 90, 10, 20, 40, 50, 70, 90, 100]
            }]
         },
         //Chart.js options that controls the appearance of the chart
         options: {
            scales: {
               yAxes: [{
                  ticks: {
                     beginAtZero: true
                  },
                  gridLines: {
                     display: true
                  }
               }],
               xAxes: [{
                  gridLines: {
                     display: false
                  }
               }]
            },
            legend: {
               display: true
            },
            responsive: true,
            maintainAspectRatio: false
         }
      }
   },
   mounted() {
      //renderChart function renders the chart with the datacollection and options object.
      this.renderChart(this.datacollection, this.options)
   }
}

有关详细信息，请参阅 official documentation。

Answer 2

这就是我在 vue.js 和 laravel project.The 中添加折线图的方式我所做的工作是计算每个月的完成任务并在折线图中显示图。

首先，您必须在名为 LineChart.js 的组件 directory.Save 中为折线图设置组件。此文件夹将包含：

import { Line, mixins } from 'vue-chartjs'
const { reactiveProp } = mixins

export default {
extends: Line,
mixins: [reactiveProp],
props: ['options'],
mounted () {
    // this.chartData is created in the mixin.
    // If you want to pass options please create a local options object
    this.renderChart(this.chartData, this.options)
 }
}

然后你必须将代码写入你的vue文件。

<div class="display">
 <line-chart :chart-data="datacollection"></line-chart>

 mounted() {

        this.LoadCompleteTaskbyMonth();
    }

 data() {
        return {
            months: null,
            month_data: null,
            datacollection: null
        }
    }



methods:{
       LoadCompleteTaskbyMonth()
          {
           this.$Helpers.Get('task-complete', {},this.$store.state.token)
          .then((response) => {
           this.months = response.map(a => a.month);
           this.month_data = response.map(a => a.value);
           this.datacollection = {
           labels:this.months,
datasets: [
           {
             label: 'Completed Task',
             data:this.month_data
           }
          ]
   }
 })
}
}

这是查询函数：

 public function completeTask()
{
    $data = array();
    $data = DB::table('tasks')
        ->select(
            DB::raw("DATE_FORMAT(tasks.created_at,'%Y-%m') AS month2"),
            DB::raw("DATE_FORMAT(tasks.created_at,'%Y-%M') AS month"),
            DB::raw('count(*) AS value')
        )
        ->groupBy('month','month2')
        ->orderBy('month2','ASC')
        ->where('task_status_id', '=', 5)
        ->get();
    return response()->json($data);
}

注意：任务完成是 URL

Vue.js Uncaught TypeError: _vueChartjs.Line.extend is not a function

Vue.js Uncaught TypeError: _vueChartjs.Line.extend is not a function

webpack

vuejs2

vue-component

vue-chartjs