How to use jQuery to achieve some simple chart effects

jQuery is a very popular JavaScript library that most web developers are accustomed to using to handle DOM operations and event handling.

In addition, it also has a very powerful function-chart function.

In this article, we will see how to use jQuery to achieve some simple chart effects.

1. Create basic HTML code

Before we start writing jQuery code, we need to create some basic HTML code first.

First, we need to create an HTML page that contains a div element to display the chart.

<title>jQuery图表功能实现</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>

<div id="chart"></div>

Here, we introduce the jQuery and Chart.js libraries.

Next, we will write some jQuery code to create the chart.

2. Create a column chart

We will first create a column chart. We will generate some random data and display it in a column chart.

To create a column chart, we need to define an object that contains the labels and data to be displayed.

var data = {

labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
datasets: [
    {
        label: 'My First Dataset',
        backgroundColor: 'rgba(255, 99, 132, 0.2)',
        borderColor: 'rgba(255, 99, 132, 1)',
        borderWidth: 1,
        hoverBackgroundColor: 'rgba(255, 99, 132, 0.4)',
        hoverBorderColor: 'rgba(255, 99, 132, 1)',
        data: [random(), random(), random(), random(), random(), random(), random()]
    }
]

};

Here we use a random() function to generate a random value for each data point.

Next, we will use jQuery selectors to select the div element containing the chart and create a canvas element within it.

var ctx = $('#chart');
ctx.append('');

Finally , we will use the Chart.js library to create a column chart.

new Chart($('#barChart'), {

type: 'bar',
data: data,
options: {
    responsive: true,
    legend: {
        position: 'top',
    },
    title: {
        display: true,
        text: 'Bar Chart'
    }
}

});

Here we use a type attribute to specify the type of chart - column shape diagram.

3. Create a line chart

Next, we will create a line chart. Similar to the column chart, we will generate some random data and display it in a line chart.

var data = {

labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
datasets: [
    {
        label: 'My Second Dataset',
        fill: false,
        lineTension: 0.1,
        backgroundColor: 'rgba(75,192,192,0.4)',
        borderColor: 'rgba(75,192,192,1)',
        borderCapStyle: 'butt',
        borderDash: [],
        borderDashOffset: 0.0,
        borderJoinStyle: 'miter',
        pointBorderColor: 'rgba(75,192,192,1)',
        pointBackgroundColor: '#fff',
        pointBorderWidth: 1,
        pointHoverRadius: 5,
        pointHoverBackgroundColor: 'rgba(75,192,192,1)',
        pointHoverBorderColor: 'rgba(220,220,220,1)',
        pointHoverBorderWidth: 2,
        pointRadius: 1,
        pointHitRadius: 10,
        data: [random(), random(), random(), random(), random(), random(), random()]
    }
]

};

Here we use another random() function to generate random values ​​for each data point.

Next, we will use the same method to create the canvas element and select the div element that contains the chart.

var ctx = $('#chart');
ctx.append('');

Finally , we will use the Chart.js library to create a line chart.

new Chart($('#lineChart'), {

type: 'line',
data: data,
options: {
    responsive: true,
    legend: {
        position: 'top',
    },
    title: {
        display: true,
        text: 'Line Chart'
    }
}

});

Here we use a type attribute to specify the type of chart - polyline picture.

Conclusion

In this article, we have successfully created column and line charts using jQuery and Chart.js library and displayed them on an HTML page.

These examples are just the tip of the iceberg of jQuery charting capabilities. Using jQuery and the Chart.js library, you can create various different types of charts, such as pie charts, radar charts, and more.

Let’s learn more in the next article!

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