stuck with nodejs callback

Question

getDbFiles(store, function(files){
require('ms-db').connect("DBname", function (db) {
    db.collection('collectionName').find().toArray(function (err, data) {
        console.log(data);
        store = data;
    })
});
      getCdnFiles(store, function(files1) {

      });});

I want to call this getDbFiles func make query, whose result should be accessible by getCdnFiles(), but it is showing error that 'store ' is not defined. so pls help me with this, how to achieve this using node js and callbacks...

Answer 1

If you want the result of getDbFiles to be accessible by getCdnFiles you need to move the call to getCdnFiles into the callback function of db.collection

getDbFiles(store, function(files){
  require('ms-db').connect("DBname", function (db) {
    db.collection('collectionName').find().toArray(function (err, data) {
      console.log(data);
      store = data;

      getCdnFiles(store, function(files1) {

      });
    });
  });
});

You can also use async.waterfall to help minimize the callback levels.