How to send the value of a Python variable to JavaScript in HTML -


i using google app engine display google map on web page.

i want bring latitude , longitude in database , display on map. this, need pass imported latitude , longitude javascript in html. have tried several ways useless. (ex. {{variable}} useless.)

how best debug or otherwise proceed on this?

class map(webapp2.requesthandler):      db = connect_to_cloudsql()     cursor = db.cursor()     cursor.execute("""select latitude,longitude user;""")      data=cursor.fetchone()      lat=data[0]     lng=data[1]      formstring = """     <!doctype html>      <html lang="ko-kr">     <head>     <meta charset="utf-8"/>         <meta name="google-site-verification" content="9eqlgizcmwfo7xacse4sbnz_t0guladyef9bco0dy3k"/>     </head>     <body class>     <style>      #map {         width: 80%;         height: 400px;         background-color: grey;       }     </style>     <div style="position:relative;width:1080px;margin:0 auto;z-index:11">     <div class="container" role="main">     <div id="map"></div>     <br><br>     <script async defer     src="https://maps.googleapis.com/maps/api/js?key=mykey&callback=initmap">     </script>      <script>       function initmap() {          var uluru = {lat: {lat} , lng: {lng} };         var map = new google.maps.map(document.getelementbyid('map'), {           zoom: 4,           center: uluru         });         var marker = new google.maps.marker({           position: uluru,           map: map         });       }     </script>      </div>     </div>     </body>     </html>         """

take @ string formatters. grow web app, you'll want switch using templates because more robust. webapp2 provides support jinja2 templates, used , make life easier in long run.

but in short run, use string formatters:

formstring = """ <!doctype html>  ...      var uluru = {lat: %f , lng: %f };     var map = new google.maps.map(document.getelementbyid('map'), { ... """ % (lat, lng)  # assuming lat/lng floats, use %s instead of %f strings

alternatively, use "new way":

formstring = """<html.......{lat: {:f}, lng: {:f}...""".format(lat, lng)

again, @ string formatters.


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