node js - get url params from original base url

问题

In my node JS express app I have defined routes with path having regex expressions in my app.js file. i.e

var tableRoute = require('./routes/tables');
app.use('/keyspaces/(regex to match param)/tables',tableRoute);

Then in my routes/tables.js file I have following handler defined for this route

router.get('/', function(req, res, next) {
// need to access url param here
});

Now clearly I cannot access my url param via req.params.xzy because here handler is defined for '/' not for '/keyspaces/:xzy/tables', is there any way I can access this url param here from original base url.

回答1:

You can add a middleware to handle it. In your example :

var tableRoute = require('./routes/tables');
app.use('/keyspaces/:xzy/tables',function(req,res,next){
  req.xyz=req.params.xyz;
  next();
},tableRoute);

Then in routes table you can access it and set req.params by your own :

router.get('/', function(req, res, next) {
  req.params.xyz = req.xyz;
});

回答2:

refer to this comment.

for me its work only with call to the next middleware, else he will end in the first middleware call

like this:

var tableRoute = require('./routes/tables');
app.use('/keyspaces/:xzy/tables',function(req,res,next){
    req.xyz=req.params.xyz;
    next();
},tableRoute);

and then you can add:

router.get('/', function(req, res, next) {
   req.params.xyz = req.xyz;
});

来源：https://stackoverflow.com/questions/28612822/node-js-get-url-params-from-original-base-url