有人知道是否可以在谷歌图表中添加实时更新功能吗？我不想使用按钮来更新数据；相反，我希望图形在数据库数据发生更改时自动更改。这是我用来显示折线图的代码，它的工作原理是正确的。
index.php
<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript" src="jquery-1.9.1.min.js"></script>
<script type="text/javascript">
google.load('visualization', '1', {'packages':['corechart']});
google.setOnLoadCallback(drawChart);
function drawChart() {
var jsonData = $.ajax({
url: "getData.php",
dataType:"json",
async: false
}).responseText;
var data = new google.visualization.DataTable(jsonData);
var options = {
width: '100%',
height: 500,
legend: 'none',
colors: ['orange','red','green'],
vAxis: {textStyle: {color: 'white'}},
hAxis: {textStyle: {color: 'white'}}
};
var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="chart_div"></div>
</body>
getData.php我以以下格式从数据库中获取数据：
$db_conn_pyr = connect();
function getOrderrader($datum){
// gets order rows ...
}
$pastDate = date('Ymd', strtotime("-1 month"));
$sqlTrans = "SELECT DISTINCT D3611 FROM PUPROTRA WHERE D3625 = 'U' AND D3601 = 'O' AND
D3611 >= $pastDate ORDER BY D3611 ASC";
$resultTrans = odbc_exec($db_conn_pyr, $sqlTrans)or die(odbc_errormsg());
$data = array(
'cols' => array(
array('id' => '', 'label' => 'datum', 'type' => 'string'),
array('id' => '', 'label' => 'Target', 'type' => 'number'),
array('id' => '', 'label' => 'Target', 'type' => 'number'),
array('id' => '', 'label' => 'Orderrader', 'type' => 'number')
)
);
while($row = odbc_fetch_array($resultTrans)){
$datum = utf8_encode($row['D3611']);
$ordernr = getOrderrader($datum);
$data['rows'][] = array(
'c' => array(
array('v' => $datum),
array('v' => 240),
array('v' => 160),
array('v' => $ordernr)
)
);
}
$string = json_encode($data);
echo $string;
非常感谢Linda
使用javascript计时器在xxx秒后调用图形创建函数，它应该对您有效。