call a variable that is declared within a function

Question

I have used message passing in my chrome extension to move data from the background.js to the content.js file.

Within the function below when I output the variable to the console within the function I get the data I expect. When I try the same outside of the function I get null (as defined in the global variable).

Does anyone have an idea how I can pull the data out of the function so I can post it with my AJAX call.

Code

var capturedData = "url=" + window.location.href;
var localHash = "localhash=" + CryptoJS.MD5(capturedData);
var email = null;

chrome.extension.sendMessage({greeting: "hello"}, function(response) {
    email = response;
    console.log(JSON.stringify(email));
    return true;
});
console.log(JSON.stringify(email));


$.ajax({
    type: 'post',
    url: 'url',
    data: {"url":capturedData, "localhash":localHash},
    dataType: 'json',
    success : function (data) {
        if(data.url)
        {
            console.log(data.url);
        }  
    }
});

Output

null content.js:10 {"email":"[email protected]"} content.js:7

Thanks!

You can't (or you really don't want to). You should make the AJAX call from inside the first callback. Just throw your AJAX call in a function, then invoke it in the callback. — Lye Fish
– Lye Fish, Commented Apr 3, 2015 at 23:10

Carorus · Accepted Answer · 2015-04-03 23:10:09Z

1

You need to make your ajax call after you get some value on email:

var capturedData = "url=" + window.location.href;
var localHash = "localhash=" + CryptoJS.MD5(capturedData);
var email = null;

chrome.extension.sendMessage({greeting: "hello"}, function(response) {
    email = response;
    console.log(JSON.stringify(email));


$.ajax({
    type: 'post',
    url: 'url',
    data: {"url":capturedData, "localhash":localHash},
    dataType: 'json',
    success : function (data) {
       if(data.url)
       {
        console.log(data.url);
       }  
    }
 });

return true;
});

 console.log(JSON.stringify(email));

answered Apr 3, 2015 at 23:10

Carorus

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