如何从PyQT调用JavaScript函数 [英] How to call javascript function from PyQT
问题描述
我正在尝试使用python与Google地图进行互动。我使用QWebView在PyQT中构建了一个应用程序。所述QWebView加载一个本地HTML页面，如下所示：
I'm trying to interact with a google map using python. I've built an application in PyQT with a QWebView. The QWebView loads a local html page as shown here:
browser = QwebView()
browser.load(QUrl("file:///c:/main.html"))
frame = browser.page().currentFrame()
frame.evaluateJavaScript(QString("addMarker(-33.89, 151.275)"))
html页面如下：
The html page is as follows:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0px; padding: 0px }
#map_canvas { height: 100% }
</style>
<script type="text/javascript"
src="http://maps.google.com/maps/api/js?sensor=false">
</script>
<script type="text/javascript">
var map;
function initialize() {
var latlng = new google.maps.LatLng(-34.397, 150.644);
var myOptions = {
zoom: 8,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
}
function addMarker(lat, lng) {
var myLatLng = new google.maps.LatLng(lat, lng);
var beachMarker = new google.maps.Marker({position: myLatLng,
map: map
});
}
</script>
</head>
<body onload="initialize();">
<div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>
如何从Python中调用 addMarker ？
How can I call addMarker from Python?
我试着从HTML调用addMarker（将调用添加到 onload 调用中），然后尝试使用来自python的简单javascript表达式（ frame.evaluateJavaScript（alert（5）））。这两个工作，所以我知道 addMarker 和 evaluateJavaScript 可以工作，我只是不知道如何。
I have tried calling addMarker from the HTML (added the call to the onload call) and I tried using a simple javascript expression from the python (frame.evaluateJavaScript("alert(5)")). Both of those worked, so I know that addMarker and evaluateJavaScript can work, I just don't know how.
我还试图调用 evaluateJavaScript（ addMarker（-33.89,151.275））上的 frame.documentElement（）对象和也不能工作。
I also tried calling evaluateJavaScript("addMarker(-33.89,151.275)") on the frame.documentElement() object and that didn't work either.
推荐答案
在错误是我需要等待页面加载。我添加了一个连接到 evaluateJavaScript（addMarker（-33.89,151.275））调用的按钮。当我点击按钮（加载页面后）时，标记按预期添加。
The error was that I needed to wait for the page to load. I added a button that was connected to the evaluateJavaScript("addMarker(-33.89,151.275)") call. When I clicked the button (after the page loaded), the marker was added as expected.
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