# Chart

Managing background charts is also a common requirement. The chart here only recommends ECharts, full-featured, community demo is also rich [gallery](http://gallery.echartsjs.com/explore.html)。

I still have that point of view. Most plug-ins recommend that use vue for packaging by yourself. It's really simple. ECharts supports the import of webpack, you can import the whole ECharts `var echarts = require ('echarts')` However, ECharts is not small, if you use only a small part of the features or chart type, then recommend on-demand import.

```js
// Import on demand -- import ECharts main module
var echarts = require('echarts/lib/echarts')
// Import bar
require('echarts/lib/chart/bar')
// Import tooltip&title
require('echarts/lib/component/tooltip')
require('echarts/lib/component/title')

// Import all ECharts module
var echarts = require('echarts')
```

[Use ECharts with webpack](https://ecomfe.github.io/echarts-doc/public/en/tutorial.html#Use%20ECharts%20with%20webpack)

[Include ECharts charts and components on demand](https://ecomfe.github.io/echarts-doc/public/en/tutorial.html#Use%20ECharts%20with%20webpack)

Next we will declare the initialization of ECharts in vue. Because ECharts initialization must be bound to dom, we can only initialize it during vue's mounted lifetime.

```js
mounted() {
  this.initCharts();
},
methods: {
  initCharts() {
    this.chart = echarts.init(this.$el);
    this.setOptions();
  },
  setOptions() {
    this.chart.setOption({
      title: {
        text: 'ECharts 入门示例'
      },
      tooltip: {},
      xAxis: {
        data: ["衬衫", "羊毛衫", "雪纺衫", "裤子", "高跟鞋", "袜子"]
      },
      yAxis: {},
      series: [{
        name: '销量',
        type: 'bar',
        data: [5, 20, 36, 10, 10, 20]
      }]
    })
  }
}
```

It's that simple, ECharts is configured, at this point you want to say that my data is obtained remotely, or how do I dynamically change the configuration of ECharts? We can trigger the setOptions method with watch

```js
// The first watch options change Using the depth of vue watcher, options are re-setOption
watch: {
  options: {
    handler(options) {
      this.chart.setOption(this.options)
    },
    deep: true
  },
}
// The second only watch data changes trigger ECharts only when the data changes
watch: {
  seriesData(val) {
    this.setOptions({series:val})
  }
}
```

In fact, they are all similar, or they must be combined with their own business. There is no difference between using ECharts in peacetime.

## Demo

![](https://adempiere-vue.gitee.io/gitee-cdn/adempiere-vue-site/137aeadd-ad0e-4b21-badd-c53f96b7482b.gif)

::: tip Code
`@/views/dashboard/admin/components`
:::

## ECharts chart width is displayed incorrectly?

Sometimes you put ECharts in `el-tab` or`el-dialog`, and you will find that the width of the chart will be displayed incorrectly. As shown below:

<img :src="$withBase('/images/ECharts-width.png')" alt="ECharts-width.png" width="500px">

Because ECharts itself is not adaptive, you need to manually call its `.resize ()` method when the width of your parent container changes.
For example, `el-tab`, you can listen to the`change` event, and call the `.resize ()` method after finding the chart when the change occurs.

```html
<template>
  <el-tabs v-model="active" @tab-click="handleClick">
    <el-tab-pane label="用户管理" name="first">
      <Chart ref="Chart" />
    </el-tab-pane>
    <el-tab-pane label="配置管理" name="second">配置管理</el-tab-pane>
    <el-tab-pane label="角色管理" name="third">角色管理</el-tab-pane>
    <el-tab-pane label="定时任务补偿" name="fourth">定时任务补偿</el-tab-pane>
  </el-tabs>
</template>

<script>
  export default {
    data() {
      return {
        active: 'second'
      };
    },
    watch: {
      active(val) {
        this.$nextTick(() => {
          this.$refs.Chart.resize();
        }
      }
    },
    methods: {
      handleClick(tab, event) {
        console.log(tab, event);
      }
    }
  };
</script>
```

It is relatively simple to put the chart in the `el-dialog`, as long as the init chart is displayed after the dialog appears.

## Others

Of course there are many other libraries in the community, such as [d3](https://github.com/d3/d3) , [Chart.js](https://github.com/chartjs/Chart.js) , [chartist-js](https://github.com/gionkunz/chartist-js). The packaging methods are almost the same, and they are no longer here.