html & javascript to use Python variables in GAE

Question

The code bellow is a part of a Google App Engine project I am building with Python. I am taking input of x and y(not seen here), and printing it here as a table with its x,y coordinate as the text in the table. Additionally, I need to make it so that when you click on a cell of the table, it calls a function which will return a string for it to pop up with. For simplicity at this time it's just the X and Y again.
So in short, I need a way to pass a variable from Python to HTML so it can be passed to javascript. How can I do that?

def testFunc(self, x, y):
        return str(x) + " , " + str(y)
    def drawTable(self, row , col):
        write = self.response.write
        write(row)
        write(col) 
        write("<html><body><script> function tableInfo() { alert(\""+ self.testFunc(x, y)+""\");}</script><table>")
        for y in range(row):
            write("<tr>")
            for x in range(col):
                cell = "<td bgcolor=\"#00FF00\" onclick = \"tableInfo(x, y)\">" + str(x) + " " + str(y) + "</td>"
                if x % 2 == 0:
                    cell = "<td bgcolor=\"#FF0000\" onclick = \"tableInfo(x, y)\">" + str(x) + " " + str(y) + "</td>"
                write(cell)
            write("</tr>")    
        write("</table></body></html>")

use a jinja template to create dynamic HTML. See getting started with Python on GAE and use jQuery to get the elements. — voscausa
– voscausa, Commented Jun 12, 2013 at 21:41
Is it wrong that in my 2ish months of learning GAE that I've never heard of jinja? — EasilyBaffled
– EasilyBaffled, Commented Jun 12, 2013 at 22:10
If you are new to GAE, the Python27 getting started quide is important, because of webapp2. Jinja2 is the preferred templating library for GAE with Python27. I can also recommend the udacity webdevelopment lessons. They also use GAE Python27. — voscausa
– voscausa, Commented Jun 13, 2013 at 10:46

Brent Washburne · Accepted Answer · 2013-06-12 21:41:30Z

1

You can write Javascript, substituting values from Python:

write("""<html><head>
    <script>
    var x = %d, y = %d;
    </script>
    </head>""" % (x, y))

Now you can use x and y in other Javascript code.

answered Jun 12, 2013 at 21:41

Brent Washburne

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1 Comment

Daniel Roseman Over a year ago

... but don't. Use a template language, like Jinja.

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