解决google chart使用服务器端代码获取填充数据--json格式

可以使用服务器端代码获取你的图表数据。服务器端代码可以加载本地文件，查询数据库或者以其他方式获取数据。以下这个php例子展示了当页面被请求时如何从本地的text文件读取图表数据。

exampleUsingPHP.html file

此文件中，drawChart()调用jquery的ajax（）函数发送url请求并得到返回的json字符串。url请求的是本地文件getData.php。返回数据实际上是本地文件sampleData.json中定义的一个DataTable。这个DataTable就是用来产生展示在页面上的饼图数据。

type="text/javascript"src="https://www.google.com/jsapi">
type="text/javascript"src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js">
type="text/javascript">

// Load the Visualization API and the piechart package.
  google.load('visualization','1',{'packages':['corechart']});

// Set a callback to run when the Google Visualization API is loaded.
  google.setOnLoadCallback(drawChart);

function drawChart(){
var jsonData = $.ajax({
     url:"getData.php",
     dataType:"json",
     async:false
}).responseText;

// Create our data table out of JSON data loaded from server.
var data =new google.visualization.DataTable(jsonData);

// Instantiate and draw our chart, passing in some options.
var chart =new google.visualization.PieChart(document.getElementById('chart_div'));
   chart.draw(data,{width:400, height:240});
}






id="chart_div">

getData.php

当此文件收到请求时，返回本地sampleData.json文件的一份拷贝。

php 

// This is just an example of reading server side data and sending it to the client.
// It reads a json formatted text file and outputs it.

$string = file_get_contents("sampleData.json");
echo $string;

// Instead you can query your database and parse into JSON etc etc

?>

sampleData.json file

{
"cols":[
{"id":"","label":"Topping","pattern":"","type":"string"},
{"id":"","label":"Slices","pattern":"","type":"number"}
],
"rows":[
{"c":[{"v":"Mushrooms","f":null},{"v":3,"f":null}]},
{"c":[{"v":"Onions","f":null},{"v":1,"f":null}]},
{"c":[{"v":"Olives","f":null},{"v":1,"f":null}]},
{"c":[{"v":"Zucchini","f":null},{"v":1,"f":null}]},
{"c":[{"v":"Pepperoni","f":null},{"v":2,"f":null}]}
]

}

link:

• DataTable JSON format

https://developers.google.com/chart/interactive/docs/reference#dataparam

尝试了一下，成功！！！