我要循环显示Google图表。没有循环我的图表工作正常,但当我尝试在循环中添加它我得到它只为第一次迭代,我如何解决它,请查看此
<script type="text/javascript">
google.load("visualization", "1", {packages:["corechart"]});
google.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable([
['Task', 'Daily Report'],
['Points Achieved', <?php echo $points_achieved?>],
['Points Left', <?php echo $points_left?>]
]);
var options = {
backgroundColor: 'transparent',
title: '' ,
chartArea:{right:0,top:0,width:"90%",height:"100%" }
,height: 150
,width: 200,
};
var chart = new google.visualization.PieChart(document.getElementById('piechart'));
chart.draw(data, options);
}
</script>
<?php
$sql= "SELECT * FROM employees";
$query= mysqli_query($connection, $sql);
while($res= mysqli_fetch_assoc($query)): ?>
<div id='piechart'></div>
//other data from database comes here
<?php endwhile;?>
答案 0 :(得分:1)
由于您正在绘制多个图表,我建议修改drawChart
函数以接受图表ID和数据作为参数:
function drawChart(chartId,data) {
var dataTable = google.visualization.arrayToDataTable(data);
var options = {
backgroundColor: 'transparent',
title: '' ,
chartArea:{right:0,top:0,width:"90%",height:"100%" },
height: 150
,width: 200,
};
var chart = new google.visualization.PieChart(document.getElementById(chartId));
chart.draw(dataTable, options);
}
然后你可以迭代PHP数组并调用drawChart
函数:
<?php
foreach ($reports as $key => $report) {
$chartId = "piechart_$key";
//prepare chart data
$chartData = array(
array("Task", "Daily Report"),
array("Points Achieved" , $report["Points Achieved"]),
array("Points Left" , $report["Points Left"])
);
?>
<div id='<?php echo $chartId; ?>'></div>
<script type="text/javascript">drawChart('<?php echo $chartId; ?>',<?php echo json_encode($chartData); ?>)</script>
<?php
}
?>
假设$reports
数组具有以下结构:
//input data example ( replace it with data retrieved from DB)
$reports = array(
"R1" => array("Points Achieved" => 20, "Points Left" => 4),
"R2" => array("Points Achieved" => 40, "Points Left" => 14),
"R3" => array("Points Achieved" => 10, "Points Left" => 0)
);