可以用vue-chartjs打印图表吗？

Question

我正在使用 vue-chartjs 在网络应用程序上渲染图表。我知道如果您使用原始库，您可以打印图表。但是我不知道如何使用 vue 版本的库来做到这一点。

我的图表变量位于外部charts.js 文件中

import {Bar, mixins } from 'vue-chartjs'
Chart.defaults.global
let chartOptions = Chart.defaults.global;   
const { reactiveProp } = mixins
export default {
   extends: Bar,
   mixins: [reactiveProp],
   props: ['options'],

   mounted () {
    let that = this;
    that.chartOptions = {
      scales: {
        yAxes: [{
            ticks: {
                suggestedMin: 0,  
                fontFamily: "'Overpass_Mono', 'Monaco', monospace",
                fontColor: "rgba(254, 255, 248, 0.5)"
            },
            gridLines: {
                color: 'rgba(255, 80, 248, 0.08)',
                zeroLineColor: 'rgb(168, 119, 181)',
                 zeroLineWidth: 2
            },
        }],
        xAxes: [{
            ticks: {
                suggestedMin: 0,    
                 fontColor: "rgb(168, 119, 181)"

            },
            gridLines: {
                color: 'rgba(255, 80, 248, 0.08)',
                zeroLineColor: 'transparent',
            }
        }],
    },
    legend: {
        labels: {
            fontColor: 'rgb(168, 119, 181)',
        }
    }
  },
    this.renderChart(this.chartData, that.chartOptions)
  }
}

然后在我的组件模板上有：

<template>
    <div class="report">
        <charts v-if="todaySelected"
                :chart-id="'total_visits_chart_bar'" 
                :height="chartsHeight" 
                :options="chartOptions"
                :chart-data="datacollection" 
        ></charts>
        <div v-if="todaySelected">
        <button @click="printChart(charts)">Print chart</button>
    </div>
</template>
<script>
import charts from './chart_0.js'
    components: {
       charts,
    },
    data() {
        return{
             datacollection: {"datasets":[{"label":"Entries Today","data":[15,15,15,0]},{"label":"Currently Inside","data":[2,2,2,0]}],"labels":[]}
        }
     }.
 methods: {
     printChart(charts) {
        charts.print();
     },
  }
</script>

任何帮助，将不胜感激。

Answer 1

答案是：是的。组件脚本中的打印方法可以是：

methods:{
  printChart() {
    var canvasEle = document.getElementById('total_visits_chart_bar');
    var win = window.open('', 'Print', 'height=600,width=800');
    win.document.write("<br><img src='" + canvasEle.toDataURL() + "' />");
    setTimeout(function(){ //giving it 200 milliseconds time to load
            win.document.close();
            win.focus()
            win.print();
            win.location.reload()
    }, 200);  
  },
}

您还可以将其添加到组件的样式中：

@media print{
    @page {
        size: landscape
        }
}