我正试图在谷歌图表的帮助下生成折线图。但是,我看到“表没有列”。我尝试在谷歌网站上给出的例子,并观察相同。以下是我的代码:
<html>
<head>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load('current', {'packages':['corechart']});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var jsonDataString = "{\"cols:\":{\"Time\":\"\",\"Sensor-1\":\"\",\"Sensor-2\":\"\",\"Sensor-3\":\"\",\"Sensor-4\":\"\"},\"rows\":[{\"1\":[{\"Sensor-1\":1024,\"Sensor-2\":1024,\"Sensor-3\":1024,\"Sensor-4\":1024}]},{\"2\":[{\"Sensor-1\":1024,\"Sensor-2\":1024,\"Sensor-3\":1024,\"Sensor-4\":1024}]},{\"3\":[{\"Sensor-1\":1024,\"Sensor-2\":1024,\"Sensor-3\":1024,\"Sensor-4\":1024}]},{\"4\":[{\"Sensor-1\":1024,\"Sensor-2\":1024,\"Sensor-3\":1024,\"Sensor-4\":1024}]},{\"5\":[{\"Sensor-1\":1024,\"Sensor-2\":1024,\"Sensor-3\":1024,\"Sensor-4\":1024}]},{\"6\":[{\"Sensor-1\":1024,\"Sensor-2\":1024,\"Sensor-3\":1024,\"Sensor-4\":1024}]},{\"7\":[{\"Sensor-1\":1024,\"Sensor-2\":1024,\"Sensor-3\":1024,\"Sensor-4\":1024}]},{\"8\":[{\"Sensor-1\":1024,\"Sensor-2\":1024,\"Sensor-3\":1024,\"Sensor-4\":1024}]},{\"9\":[{\"Sensor-1\":1024,\"Sensor-2\":1024,\"Sensor-3\":1024,\"Sensor-4\":1024}]},{\"10\":[{\"Sensor-1\":1024,\"Sensor-2\":1024,\"Sensor-3\":1024,\"Sensor-4\":1024}]}]}";
var jsonData = JSON.parse(jsonDataString);
console.log(jsonData);
var data = new google.visualization.DataTable(jsonData);
var options = {
title: 'time - temp',
curveType: 'function',
legend: { position: 'bottom' }
};
var chart = new google.visualization.LineChart(document.getElementById('curve_chart'));
chart.draw(data, options);
}
</script>
</head>
<body>
<div id="curve_chart" style="width: 900px; height: 500px"></div>
</body>
</html>
任何想法,我哪里出错了? 感谢。
答案 0 :(得分:0)
您的JSON对象格式不正确,无法直接从中生成数据表。接受的JSON格式为:
{
"cols": [
{"label":"Topping","type":"string"},
{"label":"Slices","type":"number"}
],
"rows": [
{"c":[{"v":"Mushrooms"},{"v":3}]},
{"c":[{"v":"Onions"},{"v":1}]},
{"c":[{"v":"Olives"},{"v":1}]},
{"c":[{"v":"Zucchini"},{"v":1}]},
{"c":[{"v":"Pepperoni"},{"v":2]}
]
}
一个嵌套的JSON对象,其中'cols'数组包含X个对象,其中X =您的列数;'rows'数组,包含Y个'c'个节点,其中Y =您的行数在每个'c'节点内,Z个'v'节点,其中Z =你的列数。
您应该在此处查看Google文档:
P.S尝试用我的示例中提供的JSON字符串替换你的JSON字符串,你会看到你的折线图将被绘制,因为我没有在你的代码中看到任何错误。