我正在使用新发布的注释图表 https://developers.google.com/chart/interactive/docs/gallery/annotationchart在 gwt 中通过调用本机 javascript，到目前为止我得到的是让它按原样显示示例图表，但我遇到的问题是它根本不具有交互性。它看起来更像是一个图像。有人知道我如何才能使其正常工作吗？
这是我正在使用的代码：
public void onModuleLoad() {
createChart();
}
private native void createChart()
/*-{
$wnd.google.setOnLoadCallback(drawChart);
function drawChart() {
var data = new $wnd.google.visualization.DataTable();
data.addColumn('date', 'Date');
data.addColumn('number', 'Kepler-22b mission');
data.addColumn('string', 'Kepler title');
data.addColumn('string', 'Kepler text');
data.addColumn('number', 'Gliese 163 mission');
data.addColumn('string', 'Gliese title');
data.addColumn('string', 'Gliese text');
data.addRows([
[new Date(2314, 2, 15), 12400, undefined, undefined,
10645, undefined, undefined],
[new Date(2314, 2, 16), 24045, 'Lalibertines', 'First encounter',
12374, undefined, undefined],
[new Date(2314, 2, 17), 35022, 'Lalibertines', 'They are very tall',
15766, 'Gallantors', 'First Encounter'],
[new Date(2314, 2, 18), 12284, 'Lalibertines', 'Attack on our crew!',
34334, 'Gallantors', 'Statement of shared principles'],
[new Date(2314, 2, 19), 8476, 'Lalibertines', 'Heavy casualties',
66467, 'Gallantors', 'Mysteries revealed'],
[new Date(2314, 2, 20), 0, 'Lalibertines', 'All crew lost',
79463, 'Gallantors', 'Omniscience achieved']
]);
var chart = new $wnd.google.visualization.AnnotationChart($wnd.document.getElementById('chart_div'));
var options = {
displayAnnotations: true,
};
chart.draw(data, options);
}
}-*/;
我正在 HTML 文件中加载库：
<!doctype html>
<!-- The DOCTYPE declaration above will set the -->
<!-- browser's rendering engine into -->
<!-- "Standards Mode". Replacing this declaration -->
<!-- with a "Quirks Mode" doctype is not supported. -->
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<!-- -->
<!-- Consider inlining CSS to reduce the number of requested files -->
<!-- -->
<link type="text/css" rel="stylesheet" href="GUI.css">
<!-- -->
<!-- Any title is fine -->
<!-- -->
<title>Analytics</title>
<!-- -->
<!-- This script loads your compiled module. -->
<!-- If you add any GWT meta tags, they must -->
<!-- be added before this line. -->
<!-- -->
<script type="text/javascript" language="javascript" src="gui/gui.nocache.js"></script>
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load("visualization", "1.1", {'packages' : ["annotationchart"] });
</script>
</head>
<!-- -->
<!-- The body can have arbitrary html, or -->
<!-- you can leave the body empty if you want -->
<!-- to create a completely dynamic UI. -->
<!-- -->
<body>
<!-- OPTIONAL: include this if you want history support -->
<iframe src="javascript:''" id="__gwt_historyFrame" tabIndex='-1' style="position:absolute;width:0;height:0;border:0"></iframe>
<!-- RECOMMENDED if your web app will not function without JavaScript enabled -->
<noscript>
<div style="width: 22em; position: absolute; left: 50%; margin-left: -11em; color: red; background-color: white; border: 1px solid red; padding: 4px; font-family: sans-serif">
Your web browser must have JavaScript enabled
in order for this application to display correctly.
</div>
</noscript>
<div id="chart_div" style="width: 900px; height: 500px;"></div>
</body>
</html>
