I would like to use a variable for the ChildSnapshot but it does not work. This is how it works.
firebase.database(CustomerDatabase).ref('Customer').once('value', function (snapshot) {
snapshot.forEach(function (ChildSnapshot) {
console.log(ChildSnapshot.val().Firstname);
}
This is how I would like it to work. But that throws an error.
let child_var = "Firstname";
firebase.database(CustomerDatabase).ref('Customer').once('value', function (snapshot) {
snapshot.forEach(function (ChildSnapshot) {
console.log(ChildSnapshot.val().child_var);
}
Help appreciated.
You'll want to use [] notation for that:
console.log(ChildSnapshot.val()[child_var]);
This is a common JavaScript problem. What you are actually doing in the second code block is attempting to access the property named "child_var" instead of the one named "Firstname". Use bracketed property access to use a variable to access properties:
ChildSnapshot.val()[child_var]
Further reading: JavaScript property access: dot notation vs. brackets?