Hello, thanks in advance for your help.
I get the concept of callbacks, and I can see how to use them with the
node api. But, I'm having trouble fitting them into my own code.
Below is a sample of what I'm talking about.
I'm writing a small api for myself, so that I can use information from
tumblr on my own site. Here is the line from my app.js file. This
particular method retrieves the avatar url from tumblr.
//This line would return the host name, I can't figure out how to add
a callback into this.
tumblr.avatar('#some host name', 64);
The next piece of code is out of my tumblr.js file that I created.
exports.avatar = function(hostName, size) {
var obj;
if (typeof size === Number) size = 64;
//create an options for http.get()
var options = {
host: 'api.tumblr.com',
port: 80,
path: '/v2/blog/' + hostName +
'.tumblr.com/avatar/' + size
};
//retrieve the url of the avatar
var req = http.get(options, function(res) {
var data = '';
res.on('data', function(chunk) {
data += chunk;
});
res.on('end', function(err) {
obj = JSON.parse(data);
obj = obj.response.avatar_url;
});
});
};
I already have the call back within the http.get() method, but I can't
figure out where to put a call back into my avatar function, to return
the URL of the avatar back to the app.js file.
So my question is how would I go about adding a callback to this
function, so that I don't block node?
A point in the right direction would be much appreciated.
Thanks.
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