Deep dive: Do I need to rely on jQuery when using ECharts?

Do I have to introduce jQuery when using ECharts? This is a relatively common question, because ECharts itself does not have a hard dependence on jQuery, but is an independent JavaScript charting library. However, in actual projects, we often find that people habitually use ECharts with jQuery. Why is this? This article will analyze this issue in depth and provide specific code examples to explain it.

First of all, we need to make it clear that ECharts is an independent chart library. Its main function is to draw various types of charts, including line charts, bar charts, pie charts, etc. The bottom layer of ECharts is based on Canvas drawing, so it does not rely on jQuery. Therefore, in theory, it is not necessary to introduce jQuery when using ECharts.

However, why do many developers still habitually use ECharts with jQuery? This is mainly because in actual projects, we usually need to process data, DOM operations, event binding, etc., and jQuery is a powerful JavaScript library that provides convenient operation methods and cross-browser compatibility. , which can greatly simplify our development work.

Specifically, we can use jQuery to easily obtain DOM elements, bind events, send Ajax requests and other operations. These operations may occur frequently when using ECharts. For example, if we want to display dynamic data in a chart, we can send an Ajax request through jQuery to obtain the data, and then pass the data to ECharts to update the chart. At this time, jQuery can very well assist us in completing this series of operations.

Next, let’s look at a specific code example to show how to use jQuery to assist operations when using ECharts:

First, we need to introduce the ECharts and jQuery libraries into HTML File:

<script src="https://cdn.bootcdn.net/ajax/libs/echarts/5.2.1/echarts.min.js"></script>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>

Then, we create a DOM element containing the chart:

<div id="chart" style="width: 600px; height: 400px;"></div>

Next, we write JavaScript code, use jQuery to send an Ajax request to get the data, and use ECharts to draw the line chart:

$(document).ready(function() {
    $.ajax({
        url: 'https://api.example.com/data',
        success: function(data) {
            // 数据处理
            let xAxisData = data.map(item => item.date);
            let seriesData = data.map(item => item.value);

            // 绘制图表
            let myChart = echarts.init(document.getElementById('chart'));
            let option = {
                xAxis: {
                    type: 'category',
                    data: xAxisData
                },
                yAxis: {
                    type: 'value'
                },
                series: [{
                    data: seriesData,
                    type: 'line'
                }]
            };
            myChart.setOption(option);
        }
    });
});

In this code, we first send an Ajax request through jQuery to obtain data, then process the data, and use ECharts to draw a simple line chart. It can be seen that jQuery plays a role in obtaining data and DOM operations in this process, which greatly simplifies our code writing process.

To sum up, it is not necessary to introduce jQuery when using ECharts, but in actual projects, combining jQuery can improve development efficiency and make the code more concise and easy to read. Therefore, based on specific needs and project conditions, we can flexibly choose whether to introduce jQuery to assist in the use of ECharts.

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