将Json数据加载到jqPlot中

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问题描述

我在使用JSON和jqPlot时遇到问题.

I've problem with JSON and jqPlot.

jQuery脚本:

var line = [ ];
$(function(){
    $.getJSON('bin/gielda.php', function(data) {
        $.each(data, function (index, value) {
            line.push(["'"+data[index].data+"'",data[index].kurs_odn]);
        });
        console.log(line);
    });
    $.jqplot('chartdiv', [line], {
        title :' Giełda',
        axes : {
            xaxis : {
                renderer : $.jqplot.DateAxisRenderer
            }
        },
        series : [{
            lineWidth : 4,
            markerOptions : {
                style : 'square'
            }
        }]
    });
});

来自gielda.php的php:

php from gielda.php:

$pdo = new PDO('mysql:host=localhost;dbname=gielda', 'root', '');
$pdo -> setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = $pdo -> prepare("SELECT  data,kurs_odn FROM template WHERE nazwa=?");
$sql -> execute(array("ASSECOPOL"));
$gielda = $sql->fetchAll(PDO::FETCH_ASSOC);
echo json_encode($gielda);

php文件的结果如下:

Result from php file is like this:

[{"data":"2010-08-19","kurs_odn":"55.75"},{"data":"2010-08-19","kurs_odn":"55.75"},{"data":"2010-08-19","kurs_odn":"55.75"},{"data":"2010-08-20","kurs_odn":"56.2"},{"data":"2010-08-20","kurs_odn":"56.2"},{"data":"2010-08-20","kurs_odn":"56.2"}]

Console.log来自可变行:

Console.log from variable line:

[["'2010-08-19'", "55.75"], ["'2010-08-19'", "55.75"], ["'2010-08-19'", "55.75"], ["'2010-08-20'", "56.2"], ["'2010-08-20'", "56.2"], ["'2010-08-20'", "56.2"]]

和错误:uncaught exception: [object Object]

推荐答案

我可能找到了解决方案.首先，$.jqplot必须位于$ .getJSON内-我忘记了JavaScript中的异步调用代码.

I probably found the solution.At first $.jqplot have to be inside $.getJSON - I forgot about asynchronous invocation code in JavaScript.

我不必要在data [index] .data中添加了引号

I unnecessarily added quote mark to data[index].data

line.push(["'"+data[index].data+"'",data[index].kurs_odn]);

但是我不得不添加Number(data [index] .kurs_odn)，因为默认情况下它是字符串.现在看来一切正常.

But I had to add Number(data[index].kurs_odn) becouse that was string by default.Now it seems working fine.

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