JSONP allows for bypassing the same origin policy in JavaScript by using <script> tags to load third party data. However, I am uncertain about how JSONP is utilized together with AJAX.
My assumption is that:
When an AJAX call is initiated, a <script> tag is dynamically added to the document to fetch external data, which is then immediately processed.
Could you please provide a clear explanation along with a simple example to help me understand this better?
Thank you in advance.
It's functioning exactly as you envisioned:
https://i.sstatic.net/k7UWl.gif
The code inserts an asynchronous script tag into the head section, and promptly removes it after executing the callback function.
Update
Just a quick note, the example above utilized the JSONP flickr API:
setTimeout(function() {
$.getJSON('http://api.flickr.com/services/feeds/photos_public.gne?jsoncallback=?', {
tags: 'jquery',
tagmode: 'any',
format: 'json'
},
function(data) {
$.each(data.items, function(i, item) {
$('<img />').attr('src', item.media.m).appendTo('#images');
});
});
}, 2000);
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