Vue and ECharts4Taro3 Advanced Guide: How to implement real-time filtering and sorting of data visualization

Vue and ECharts4Taro3 Advanced Guide: How to implement real-time filtering and sorting of data visualization

[Introduction]
In modern web application development, data visualization has become a very important technology. Through data visualization, we can better understand and analyze large amounts of data, thereby helping us make correct decisions. This article will introduce how to use Vue and ECharts4Taro3 framework to implement real-time filtering and sorting of data visualization, and explain the specific implementation method in detail through code examples.

[Background introduction]
Vue is a lightweight JavaScript framework used to build user interfaces. It adopts the idea of ​​componentization to enable developers to build complex applications more efficiently. ECharts is a JavaScript-based visualization library that can be used to draw a variety of charts. Taro is a multi-terminal applet development framework based on React, which can implement a set of codes to run on multiple terminals.

[Implementation Method]
In this article, we will use Vue and ECharts4Taro3 to implement real-time filtering and sorting of data visualization. First, we need to prepare some basic code and data. In this example, we will use a data table containing students' names, ages, and grades as our sample data. The sample code is as follows:

<template>
  <div>
    <input v-model="keyword" placeholder="输入关键词进行筛选">
    <select v-model="sortBy">
      <option value="age">按年龄排序</option>
      <option value="score">按成绩排序</option>
    </select>
    <div ref="chart" style="width: 400px; height: 400px;"></div>
  </div>
</template>

<script>
import * as echarts from 'echarts'
export default {
  data() {
    return {
      keyword: '',
      sortBy: 'age',
      students: [
        { name: '小明', age: 18, score: 90 },
        { name: '小红', age: 20, score: 80 },
        { name: '小刚', age: 22, score: 85 },
        { name: '小强', age: 25, score: 95 },
      ]
    }
  },
  watch: {
    keyword() {
      this.updateChart()
    },
    sortBy() {
      this.updateChart()
    }
  },
  mounted() {
    this.updateChart()
  },
  methods: {
    updateChart() {
      const filteredStudents = this.students.filter(student => {
        return student.name.includes(this.keyword)
      })
      const sortedStudents = filteredStudents.sort((a, b) => {
        return a[this.sortBy] - b[this.sortBy]
      })
      const xAxisData = sortedStudents.map(student => student.name)
      const seriesData = sortedStudents.map(student => student[this.sortBy])
      const option = {
        xAxis: {
          data: xAxisData
        },
        yAxis: {},
        series: [{
          name: '成绩',
          type: 'bar',
          data: seriesData
        }]
      }
      const chart = echarts.init(this.$refs.chart)
      chart.setOption(option)
    }
  }
}
</script>

In the above code, we first define a Vue component that contains an input box, a drop-down box and a chart. In the input box, we use the v-model directive to bind a data named keyword to receive keywords entered by the user. In the drop-down box, we use the v-model directive to bind a data named sortBy to receive the sorting method selected by the user. Next, we define an array named students in the component's data attribute to store sample data. Then, we listen for changes in keyword and sortBy data in the component's watch attribute, and call the updateChart method to update the chart when it changes. Finally, we call the updateChart method in the component's mounted method to initialize the chart. In the updateChart method, we first filter the student data according to keywords, then sort the filtered data according to the sorting method, and finally generate ECharts configuration items based on the sorted data, through the echarts.init method and the $refs attribute Obtain the DOM element of the chart container, and finally call the chart.setOption method to apply the configuration item to the chart.

[Summary]
Through the above code examples, we show how to use Vue and ECharts4Taro3 to implement real-time filtering and sorting of data visualization. By entering keywords and selecting sorting methods, users can filter and sort data in real time, and display the results through charts. Such real-time filtering and sorting functions can help users better understand and analyze data and improve the accuracy of decision-making.

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