how to pass function value

问题

I have created models called (user.js)

    module.exports.show_deatils = function(req,res,callback){   
      var resultArray=[];
      mongo.connect(url,function(err,db){
        assert.equal(null,err);
        var cursor=db.collection('users').find();
        cursor.forEach(function(doc,err){
          assert.equal(null,err);
          resultArray.push(doc);         
        });
      });
    }

    router.get('/restful', function(req, res){    
      User.show_deatils(function(req,res,resultArray){
        req.session.resultArray=resultArray;
        console.log(resultArray);
      });
      res.render('restful');
    });

I have created a method("show_details") in models user.js and I am calling that particular function in routes. whenever the page (restful) gets loaded I want the data resultArray to be displayed. But I am stuck here.

Can you please suggest me how to solve the issue?

回答1:

On your res object, you need to pass the variable resultArrayin your render function, so it becomes available to use in your template.

Something like:

res.render('restful', {var_in_ejs_template: resultArray});

This is thoroughly documented in express.js's documentation: link

Also, don't put the result in the res.session property. Looks dirty.

回答2:

you user module show_deatils takes two parameters, you are not passing any, and in callback you are not using,

user.js

module.exports.show_deatils = function(req,res,callback){   
      var resultArray=[];
      mongo.connect(url,function(err,db){
        assert.equal(null,err);
        var cursor=db.collection('users').find();
        cursor.forEach(function(doc,err){
          assert.equal(null,err);
          resultArray.push(doc);         
        });
        callback(resultArray);
      });
    }

route

 router.get('/restful', function(req, res){    
      User.show_deatils(req,res,function(resultArray){
        req.session.resultArray=resultArray;
        console.log(resultArray);
        res.render('restful');
      });

    });

来源：https://stackoverflow.com/questions/42486309/how-to-pass-function-value

标签

node.js

express

ejs