How to use PHP and Vue.js to implement data filtering and sorting functions on charts

How to use PHP and Vue.js to implement data filtering and sorting functions on charts

In web development, charts are a very common way of displaying data. Using PHP and Vue.js, you can easily implement data filtering and sorting functions on charts, allowing users to customize the viewing of data on charts, improving data visualization and user experience.

First, we need to prepare a set of data for chart use. Suppose we have a data table that contains three columns: name, age and grades. The data is as follows:

Name	Age	grade
张三	18	90
李四	20	80
王五	22	85
赵六	19	95

Next, we use PHP to pass the data to Vue.js and implement it on the front end Data filtering and sorting capabilities. First, in the back-end PHP file, we can use the following code to query the data and return it to the front-end:

<?php
// 连接数据库
$conn = new mysqli("localhost", "root", "password", "database");

// 查询数据
$sql = "SELECT * FROM students";
$result = $conn->query($sql);

// 将查询结果转化为JSON格式返回给前端
$data = [];
while ($row = $result->fetch_assoc()) {
    $data[] = $row;
}
echo json_encode($data);

// 关闭数据库连接
$conn->close();
?>

Using Vue.js in the front-end, we can get and bind the data to the chart through an ajax request On the required data variables:

new Vue({
    el: "#app",
    data: {
        students: [],
        filteredStudents: []
    },
    mounted() {
        // 发送ajax请求获取数据
        axios.get("data.php").then(response => {
            this.students = response.data;
            this.filteredStudents = response.data;
        });
    },
    methods: {
        filterData() {
            // 根据选择的筛选条件，过滤数据并更新到filteredStudents
        },
        sortData(fieldName, direction) {
            // 根据指定的字段和排序方向，对数据进行排序并更新到filteredStudents
        }
    }
});

In the front-end code, we created a Vue instance and defined two variables in the data attribute: students and filteredStudents, which store original data and filtered data respectively. Send an ajax request to obtain data in mounted(), and bind the data to the corresponding variable in the then() method.

Next, we can add interactive elements for filtering and sorting on the page. For example, in the drop-down list of filter conditions, we can add the following code:

<select v-model="ageFilter" @change="filterData">
    <option value="">全部年龄</option>
    <option value="18">18岁</option>
    <option value="19">19岁</option>
    <option value="20">20岁</option>
    <option value="21">21岁</option>
    <option value="22">22岁</option>
</select>

In the sortData() method, we can use JavaScript's array sorting method to sort the data. For example, the code for sorting by name in ascending order is as follows:

sortData(fieldName, direction) {
    this.filteredStudents.sort((a, b) => {
        return a[fieldName] > b[fieldName] ? 1 : -1;
    });
    if (direction === "desc") {
        this.filteredStudents.reverse();
    }
}

Finally, use Vue data binding in HTML to display the data on the chart:

<table>
    <tr v-for="student in filteredStudents">
        <td>{{ student.name }}</td>
        <td>{{ student.age }}</td>
        <td>{{ student.grade }}</td>
    </tr>
</table>

Through the above code example, we can use PHP and Vue.js implement data filtering and sorting functions on charts. Users can select specific data through filter conditions, and then sort the data through the sorting function, thereby improving the visualization of chart data and user experience.

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