discourse/public/javascripts/embed.js

97 lines
2.4 KiB
JavaScript

(function() {
var DE = window.DiscourseEmbed || {};
var comments = document.getElementById('discourse-comments');
var iframe = document.createElement('iframe');
['discourseUrl', 'discourseEmbedUrl', 'discourseUserName', 'discourseReferrerPolicy'].forEach(function(i) {
if (window[i]) { DE[i] = DE[i] || window[i]; }
});
var queryParams = {};
if (DE.discourseEmbedUrl) {
if (DE.discourseEmbedUrl.indexOf('/') === 0) {
console.error("discourseEmbedUrl must be a full URL, not a relative path");
}
queryParams.embed_url = encodeURIComponent(DE.discourseEmbedUrl);
}
if (DE.discourseUserName) {
queryParams.discourse_username = DE.discourseUserName;
}
if (DE.topicId) {
queryParams.topic_id = DE.topicId;
}
var src = DE.discourseUrl + 'embed/comments';
var keys = Object.keys(queryParams);
if (keys.length > 0) {
src += "?";
for (var i=0; i<keys.length; i++) {
if (i > 0) { src += "&"; }
var k = keys[i];
src += k + "=" + queryParams[k];
}
}
iframe.src = src;
iframe.id = 'discourse-embed-frame';
iframe.width = "100%";
iframe.frameBorder = "0";
iframe.scrolling = "no";
if (DE.discourseReferrerPolicy) {
// See https://www.w3.org/TR/html5/semantics-embedded-content.html#the-iframe-element
iframe.referrerPolicy = DE.discourseReferrerPolicy;
}
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 normalizeUrl(url) {
return url.replace(/^https?(\:\/\/)?/, '');
}
function postMessageReceived(e) {
if (!e) { return; }
if (normalizeUrl(DE.discourseUrl).indexOf(normalizeUrl(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);
})();