Google app engine: getting javascript variable(client side) to python string(server side)

Question

1)i have printed links after processing on the screen as follows-

for i in index:
   self.response.out.write('<a id="w3s" href="' + i + '">' +i+' class="testClick" </a><br>')

where index is list of processed urls. The url where results are displayed is like mysite.com/sign

2)i want to get which link user clicked. This is what i tried to do-

<script>
var addressValue;
$(document).ready(function(){
  $("a").click(function(){
    addressValue = $(this).attr("href");
  });    
});
</script>

I have got the clicked url in addressValue variable but what should i do next. I could not get how to use GET or POST methods to get the variable server side; and then how to get the string in my python variable.

Using GET/POST:(Not Working)

<script>

var addressValue;

$(document).ready(function(){
  $("a").click(function(){
    addressValue = $(this).attr("href");

//Method-I
    $.post("https://mysite.com/sign",
    {
        fooParameter: addressValue,
    },
    function(data,status){
        alert("Data: " + data + "\nStatus: " + status);
    });
  });    
});


//Method-II
$.ajax({
    url: "https://mysite.com/sign",
    method: "POST",
    data: {fooParameter: addressValue},
});

</script>

And then accessing variable in python string through following command

selectedlink=self.request.get('fooParameter')

Where am i mistaking or is there any other way? Note: I am using Google App engine

I am not sure I understnad you but what you are looking for is pure Javascript. If you use the jQuery library, you can capture the clicked urls and post it to the server in JSON format. api.jquery.com/click api.jquery.com/jQuery.post — James King
– James King, Commented Mar 18, 2014 at 17:07
api.jquery.com/click: this i have implemented successfully but api.jquery.com/jQuery.post -> for GET/POST, i have problem implementing this. i have pasted the code above. Please check if u could help — user1465710
– user1465710, Commented Mar 18, 2014 at 17:47
Could it be a CORS issue (en.wikipedia.org/wiki/Cross-origin_resource_sharing)? You would have to allow Cross-Origin Requests by returning a Access-Control-Allow-Origin header from python backend. — Yano
– Yano, Commented Mar 18, 2014 at 18:05

voscausa · Accepted Answer · 2014-03-18 18:04:50Z

1

There is another solution, which does not need javascript. Create a link to your own handler, which redirects to the query string.

Example:

<a target="_blank" href="/redir_url?http://www.example.com/address.html">Example address</a>

The Handler:

class RedirUrl(webapp2.RequestHandler):

    def get(self):

        url = self.request.query_string
        logging.info('user clicked ' + url)
        self.redirect(url)

answered Mar 18, 2014 at 18:04

voscausa

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2 Comments

user1465710 Over a year ago

thank you very much! its working. is there any other way also. redirection is quite slow and visible.

voscausa Over a year ago

Redirection Visible? Slow?

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