CODEWITHSUNDEEP
javascriptarraysangularjsfirebase
Shakirullahi Logico
Shakirullahi Logico

Reputation: 259

array not updating within firebase once()

I have an array customers declared outside of firebase ref.once() function.

var customers = [];

I am changing the value of the array within ref.once() and trying to access the modified value out of ref.once(). But it returns the initial value [].

Here is my code

  var customers = [];
  var nameRef = new Firebase(FBURL+'/customerNames/');
  nameRef.once("value",function(snap){
      customers.push("test");
  });
  console.log(customers); // returns []

Upvotes: 2

Views: 600

Answers (1)

sch
sch

Reputation: 27506

The problem is that the once callback is executed asynchronously and that the log statement is actually called before customers.push("test");. Try the following code to see the order in which the code is executed:

var customers = [];
var nameRef = new Firebase(FBURL+'/customerNames/');
nameRef.once("value",function(snap){
    customers.push("test");
    console.log("Inside of callback: " + customers); // returns [test]

    // At this point, you can call another function that uses the new value.
    // For example:
    countCustomers();
});
console.log("Outside of callback: " + customers); // returns []

function countCustomers() {
    console.log("Number of customers: " + customers.length);
}

Upvotes: 5

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