routing parameter is once equal to undefined and nex to "undefined"

[NadjibBELLOUNDJA]

Hi,

I have a route in my symfony project that I wrote below:

at_platform_update_towns_list:
    path: /updatetownslist/{regionRealName}/{index}
    defaults: {_controller: ATPlatformBundle:CreateSession:updateTownsList, regionRealName: null , index: 1}

And in my javascript, I have got this function:

function getTownsList(regionName)
{
    var updateTownsListRoute = Routing.generate('at_platform_update_towns_list', {'regionRealName': undefined, 'index': 1});
    console.log(updateTownsListRoute);

    var updateTownsListRoute = Routing.generate('at_platform_update_towns_list', {'regionRealName': undefined, 'index': 2});
    console.log(updateTownsListRoute);
}

And this is what my console prints:

/app_dev.php/platform/updatetownslist
default-functions.js:223 /app_dev.php/platform/updatetownslist/undefined/2

I have two questions/issues about theses facts.

1. How come in the first console.log, the undefined parameter has no value and the second has literally the "undefined" string value? I would like my second generated rule to be the same as the first one, how can I do it?

2. Why is the index parameter ignored in the routing generation when the first parameter is undefined? Can someone help me to add the second routing paramater even if the first is undefined?

Thanks.

[stof]

The index parameter is not ignored in the routing when the first parameter is undefined. It is removed from the generated URL when it is equal to its default value, which is the behavior of the Symfony router too (which is why the JS does it).
The URL generated with index = 2 cannot be the same than the first one, because you would get index = 1 on the PHP side when matching the URL.

And regarding the first parameter, you see undefined in the second case, because this is what casting undefined to string produces in JS. In the first case, you don't have it, because it seems like the JS code considers that undefined is equal to the null default value, and so skips the optional parameter (because all optional parameters after it are skipped).

[NadjibBELLOUNDJA]

Ok, it is clearer now.

Thanks @stof