将数据从MYSQL数据库显示到Morris.js PHP AJAX

时间:2018-02-20 08:30:07

标签: javascript php ajax morris.js

我想将数据库中的数据显示到图表Morris.js中。我需要从我的下拉列表中选择一个分支,当我选择一个分支时,该分支的总销售额应该转移到Morris.js条形图。我在将数据传输到条形图时遇到问题。我正在使用AJAX,PHP和Morris.js。

下拉列表的PHP代码:

<select class="form-control" id="t-yearly">
    <option value="">Branch</option>
    <?php
        require_once "connect.php";

        $sql = "SELECT id,branch FROM tblLocation";
        $result = mysqli_query($conn,$sql);

        while ($row = mysqli_fetch_array($result)) {
            echo "<option value='".$row['id']."'>".$row['branch']."</option>";
        }
    ?>
</select>

用于图表显示的AJAX代码:

//Total Yearly Sales
$("#t-yearly").change(function(){
    var branch = $(this).val();
    $.ajax ({
        url:"fetch_yearly_sales.php",
        method: "POST",
        data: {branch:branch},
        success: function(branch_data){
             new Morris.Bar({
                element: 't-yearly-sales',
                data: branch_data,
                xkey: 'year',
                ykeys: ['sales'],
                labels: ['Total Sales'],
                hideHover: 'auto'
             });
             console.log(branch_data);
        }
    });
});

fetch_yearly_sales.php的PHP代码:

<?php 
require "connect.php";


$data = mysqli_real_escape_string($conn,$_POST["branch"]);

$ar = array();

if(!empty($data)){
    $sql = "SELECT year, SUM(sales) AS sales FROM tblSales WHERE branch_id=".$data." GROUP BY year";
    $result = mysqli_query($conn, $sql);

    while ($row = mysqli_fetch_array($result)) {
        $ar[] = array(
            'year' => $row['year'],
            'sales' => $row['sales']
        );
    }

    echo json_encode($ar);
} 
else if (empty($data)){
    $sql = "SELECT year, SUM(sales) AS sales FROM tblSales GROUP BY year";
    $result = mysqli_query($conn, $sql);
    while ($row = mysqli_fetch_array($result)) {
        $ar[] = array(
            'year' => $row['year'],
            'sales' => $row['sales']
        );
    }

    echo json_encode($ar);
}

2 个答案:

答案 0 :(得分:0)

您没有指定您遇到的问题,但是从代码中看起来您将JSON字符串传递给Morris,而实际上它需要一个JSON对象。因此,请尝试将data: branch_data更改为data: JSON.parse(branch_data)。我可能是错的,如果你指明了什么不起作用会有所帮助。

答案 1 :(得分:0)

我想您需要使用函数 setData(),而不是始终创建新图表。这将使用参数中给出的数据更新图表。你需要改成这样的东西:

var branch_data = [];
var my_chart = new Morris.Bar({
                element: 't-yearly-sales',
                data: branch_data,
                xkey: 'year',
                ykeys: ['sales'],
                labels: ['Total Sales'],
                hideHover: 'auto'
             });

$("#t-yearly").change(function(){
    var branch = $(this).val();
    $.ajax ({
        url:"fetch_yearly_sales.php",
        method: "POST",
        data: {branch:branch},
        dataType: "json",
        success: function(branch_data){
             my_chart.setData(branch_data);
        }
    });
});

顺便说一下,我在上面的代码中提到了dataType到JSON,这样你就不需要从服务器解析结果了。