Question

I’m reading Chrome’s extension localStorage in my content script. If I log the variable to console, everything works well. If I want to alert it, it says variable is undefined.

var data666;

chrome.extension.sendRequest({method: "getLocalStorage", key: "autoplay"}, function(response) {
  console.log(response.data); // works perfectly
  data666 = response.data;
});

alert(data666); // does not work

EDIT: I need to use the variable (data666 in this case) outside the asynchronous function.

Answer 1

note that sendRequest is an asynchronous function, data’s value will not be set until sendRequest executes the callback function.

Therefore, you need to move the alert statement into the callback function.

chrome.extension.sendRequest({method: "getLocalStorage", key: "autoplay"}, function(response) {
  console.log(response.data); // works perfectly
  data666 = response.data;
  alert(data666);
});