我正在尝试创建一个JSON对象来保存数据以用于FLOT图表。 文档说数据格式应该是这样的点数组：
[ [1, 3], [2, 14.01], [3.5, 3.14] ]
我遇到的问题是我的 AJAX 调用返回了一个数据格式如下的 JSON 对象：
Rate: [96, 74, 73, 96, 124, 104]
Year: [2008, 2009, 2010, 2011, 2012, 2013]
有人可以解释一下我应该如何修改此代码，以便它创建 FLOT 图表所需的正确数据格式吗？ 谢谢。
function ajaxmuniChart1c(){
$muni = $this->input->POST('muni');
$q = $this->db->query("SELECT SaleYear AS Y, NewSaleType AS T, count(*) AS C, format((sum(SalePrice) / sum(Quantity1)),0) AS R FROM tblsales WHERE tblsales.SaleYear > 2007 AND tblsales.Quantity1 > 2000 AND (tblsales.NewSaleType = 'Industrial') AND tblsales.Municipality = '".$muni."' GROUP BY T,Y ORDER BY T,Y");
$json_SaleYear = array();
$json_AvrgRate = array();
foreach ($q->result_array() as $row){
$json_SaleYear[] = $row['Y'];
$json_AvrgRate[] = $row['R'];
}
$json['Year'] = $json_SaleYear;
$json['Rate'] = $json_AvrgRate;
echo json_encode($json);
exit;
}
在foreach结果循环期间将它们放入 PHP 数组时将它们放入同一行：
/**
* Bind the two on the
* same row whilst looping
* the results
**/
foreach ( $q->result_array() as $row ){
$JsonArray[] = array( $row['Y'] => $row['R'] );
}
/**
* Expected Array Result:
**/
print_r( $JsonArray );
Array
(
[0] => Array
(
[2008] => 96
)
[1] => Array
(
[2009] => 74
)
/**
* echo this out as an JSON String
**/
echo json_encode( $JsonArray );
这将为您提供：
[{"2008":96},{"2009":74},{"2010":73},{"2011":96},{"2012":124},{"2013":104}]
如文档中所述，您可以为数据提供标签。为此，您需要将其推送到一个多维数组中，该数组分支为：
- 标签
- 数据
在将其编码为 JSON 数组之前，我们可以将两者连接在一起：
/**
* Create a new variable
* two join the two
**/
$WithLabels = array(
"label" => "Sales by Years",
"data" => $JsonArray
);
echo json_encode( $WithLabels );
对此进行编码，最终为我们提供了以下内容：
{
"label" : "Sales by Years",
"data" : [{"2009":74},
{"2010":73},
{"2011":96},
{"2012":124},
{"2013":104}]
}
在 foreach 结果循环期间将它们放入 PHP 数组中
// PHP CODE
$data = array(); // empty array
foreach ($query as $k=>$row) {
$data[] = array($k, $row->total_price); // store data in array
}
echo json_encode($data); // json encode
阿贾克斯对成功的回应
success: function(msg) {
var d1 = msg;
console.log(d1);
$.plot($("#chart_lines_fill_nopoints"), [d1]); //chart_lines_fill_nopoints id name
}
// Data Should be in this format
//array(array(1,300),array(1,1300),array(1,200),array(1,500)); etc
// should be in json result
[[1, 7.8], [2, 7.8], [3, 20.0], [4, 7.8], [5, 7.8]]
就是这样