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[英]Calling a function from another function JavaScript Google Maps API
[英]Running a JavaScript Function From QWebView *Google Maps API, PyQT*
我正在嘗試編寫一段代碼,該代碼從數據庫中讀取經度和緯度,並將其傳遞給JavaScript函數,然后將JavaScript標記與已從數據庫中讀取的坐標的經度和緯度相對應。
將HTML設置為QWebView后,我使用:evaluateJavaScript嘗試在JavaScript MarkersFromDatabase中運行該函數。
如您所見,我已修改QWebPage類以顯示控制台錯誤消息,當我運行該程序時,我收到此錯誤:
ReferenceError:找不到變量:MarkersFromDatabase 0 undefined
我不明白為什么我在運行一個函數時試圖找到一個變量。
我不明白為什么這不運行該功能。
任何幫助,將不勝感激。 對不起凌亂的JavaScript格式!
完整代碼:
from PyQt4.QtWebKit import *
import sqlite3
from PyQt4.QtSql import *
class CustomQWebPage(QWebPage):
def __init__(self):
super().__init__()
def javaScriptConsoleMessage(self,message,lineNumber,sourceID):
print(message,lineNumber,sourceID)
print("javascript console message^")
class ViewOnlyMap(QWebView):
def __init__(self, parent=None):
super().__init__()
self.settings().setAttribute(QWebSettings.JavascriptEnabled, True)
self.settings().setAttribute(QWebSettings.JavascriptCanOpenWindows, True)
self.settings().setAttribute(QWebSettings.JavascriptCanAccessClipboard, True)
self.settings().setAttribute(QWebSettings.DeveloperExtrasEnabled, True)
self.CustomPage=CustomQWebPage()
self.Coordinates=None
self.set_code()
self.get_marker_coordinates()
def get_marker_coordinates(self):
with sqlite3.connect("skateboard_progress_tracker.db") as db:
cursor=db.cursor()
sql="select SkateparkLongitude, SkateparkLatitude from Skatepark"
cursor.execute(sql)
self.Coordinates=cursor.fetchall()
for coordinate in self.Coordinates:
self.CustomPage.mainFrame().evaluateJavaScript('MarkersFromDatabase({0},{1})'.format(coordinate[0],coordinate[1]))
print("Marker added")
print(coordinate[0])
print(coordinate[1])
def set_code(self):
self.html='''<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Simple markers</title>
<style>
html, body, #map-canvas {
height: 100%;
width: 100%
margin: 0px;
padding: 0px
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<script>
var map;
var markers = [];
var results = [];
var coords = [];
var highestLevel;
function initialize() {
var Centre = new google.maps.LatLng(52.20255705185695,0.1373291015625);
var mapOptions = {
zoom: 8,
minZoom: 3,
center: Centre,
}
map = new google.maps.Map(document.getElementById('map-canvas'),mapOptions);
google.maps.event.addListener(map, 'click', function(event) {
AddMarker(event.latLng);
});
}
function MarkersFromDatabase(SkateparkLat,SkateparkLng) {
var Skatepark = new google.maps.LatLng(SkateparkLat,SkateparkLng);
//return Skatepark;
AddMarker(Skatepark); }
function AddMarker(location) {
var marker = new google.maps.Marker({
title: 'Test',
position: location,
animation: google.maps.Animation.DROP,
map: map
});
//markers.push(marker);
var lat = marker.getPosition().lat();
var lng = marker.getPosition().lng();
markers.push({"Object":marker,"Lat":lat,"Lng":lng});
var contentString = '<div id="content">'+
'<div id="siteNotice">'+
'</div>'+
'<h1 id="firstHeading" class="firstHeading">Skatepark</h1>'+
'<div id="bodyContent">'+
'<p>A skatepark description </p>'+
'</div>'+
'</div>';
var infowindow = new google.maps.InfoWindow({
content: contentString
});
google.maps.event.addListener(marker, 'rightclick', function(event) {
marker.setMap(null);
});
google.maps.event.addListener(marker, 'mouseover', function(event) {
infowindow.open(map,marker);
});
}
function GetMarkers(){
return markers;
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"></div>
</body>
</html> '''
self.setHtml(self.html)
在嘗試調用javascript函數之前,您需要為網頁提供加載的機會。 所以為loadFinished信號添加一個處理程序:
class ViewOnlyMap(QWebView):
def __init__(self, parent=None):
super().__init__()
...
self.setPage(self.CustomPage)
self.loadFinished.connect(self.handleLoadFinished)
self.set_code()
def handleLoadFinished(self, ok):
if ok:
print("Page loaded successfully")
self.get_marker_coordinates()
else:
print("Could not load page")
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