discourse/public/javascripts/embed.js

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JavaScript
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/* global discourseUrl */
/* global discourseEmbedUrl */
(function() {
var comments = document.getElementById('discourse-comments'),
iframe = document.createElement('iframe');
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iframe.src = discourseUrl + "embed/comments?embed_url=" + encodeURIComponent(discourseEmbedUrl);
iframe.id = 'discourse-embed-frame';
iframe.width = "100%";
iframe.frameBorder = "0";
iframe.scrolling = "no";
comments.appendChild(iframe);
// Thanks http://amendsoft-javascript.blogspot.ca/2010/04/find-x-and-y-coordinate-of-html-control.html
function findPosY(obj)
{
var top = 0;
if(obj.offsetParent)
{
while(1)
{
top += obj.offsetTop;
if(!obj.offsetParent)
break;
obj = obj.offsetParent;
}
}
else if(obj.y)
{
top += obj.y;
}
return top;
}
function postMessageReceived(e) {
if (!e) { return; }
if (discourseUrl.indexOf(e.origin) === -1) { return; }
if (e.data) {
if (e.data.type === 'discourse-resize' && e.data.height) {
iframe.height = e.data.height + "px";
}
if (e.data.type === 'discourse-scroll' && e.data.top) {
// find iframe offset
var destY = findPosY(iframe) + e.data.top;
window.scrollTo(0, destY);
}
}
}
window.addEventListener('message', postMessageReceived, false);
})();