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[英]How to implement Google Pie chart(with legend display and corresponding values)
[英]how to display label and values only on google pie chart legend with data from mysql db
我正在使用Google Charts API来显示饼图,并且我希望图例仅显示标签和值,但我遇到了麻烦,我搜索的大多数答案都包含百分比。 我怎样才能做到这一点?
我的代码如下:
PHP
$table = array();
$table['cols'] = array(
//Labels for the chart, these represent the column titles
array('id' => '', 'label' => 'Country', 'type' => 'string'),
array('id' => '', 'label' => 'Number of Devices', 'type' => 'number')
);
$rows = array();
foreach($exec as $row){
$temp = array();
//Values
$temp[] = array('v' => (string) $row['Country']);
$temp[] = array('v' => (int) $row['Number of Devices']);
$rows[] = array('c' => $temp);
}
$table['rows'] = $rows;
$jsonTable = json_encode($table);
echo $jsonTable
JavaScript的
google.charts.load('current', {'packages':['corechart']});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var PieChart_options = {
title: 'Number of Devices per country',
pieSliceText: 'value',
width: 900,
height: 500
};
var data = new google.visualization.DataTable(<?=$jsonTable?>);
var chart = new google.visualization.PieChart(document.getElementById('pie_div'));
chart.draw(data, PieChart_options);
}
我想创建一个像这样的图 : 饼图带有图例标签和值
一旦'ready'
事件触发,便可以修改图表
在绘制图表之前,请务必设置事件监听器
图例标签的显示顺序应与提供的数据相同
以下代码段通过检查属性值来找到图例标签
然后将数据中的值相加...
google.charts.load('current', { callback: function () { var data = new google.visualization.DataTable({ "cols": [ {"label": "Country", "type": "string"}, {"label": "# of Devices", "type": "number"} ], "rows": [ {"c": [{"v": "Canada"}, {"v": 33}]}, {"c": [{"v": "Mexico"}, {"v": 33}]}, {"c": [{"v": "USA"}, {"v": 34}]} ] }); var container = document.getElementById('chart_div'); var chart = new google.visualization.PieChart(container); google.visualization.events.addListener(chart, 'ready', function () { var rowIndex = 0; Array.prototype.forEach.call(container.getElementsByTagName('text'), function(label) { // find legend labels if ((label.getAttribute('text-anchor') === 'start') && (label.getAttribute('fill') !== '#ffffff')) { label.innerHTML += ' (' + data.getValue(rowIndex++, 1) + ')'; } }); }); chart.draw(data, { height: 400, width: 600 }); }, packages:['corechart'] });
<script src="https://www.gstatic.com/charts/loader.js"></script> <div id="chart_div"></div>
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