97 lines
2.4 KiB
JavaScript
97 lines
2.4 KiB
JavaScript
(function() {
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var DE = window.DiscourseEmbed || {};
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var comments = document.getElementById('discourse-comments');
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var iframe = document.createElement('iframe');
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['discourseUrl', 'discourseEmbedUrl', 'discourseUserName', 'discourseReferrerPolicy'].forEach(function(i) {
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if (window[i]) { DE[i] = DE[i] || window[i]; }
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});
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var queryParams = {};
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if (DE.discourseEmbedUrl) {
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if (DE.discourseEmbedUrl.indexOf('/') === 0) {
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console.error("discourseEmbedUrl must be a full URL, not a relative path");
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}
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queryParams.embed_url = encodeURIComponent(DE.discourseEmbedUrl);
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}
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if (DE.discourseUserName) {
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queryParams.discourse_username = DE.discourseUserName;
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}
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if (DE.topicId) {
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queryParams.topic_id = DE.topicId;
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}
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var src = DE.discourseUrl + 'embed/comments';
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var keys = Object.keys(queryParams);
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if (keys.length > 0) {
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src += "?";
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for (var i=0; i<keys.length; i++) {
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if (i > 0) { src += "&"; }
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var k = keys[i];
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src += k + "=" + queryParams[k];
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}
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}
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iframe.src = src;
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iframe.id = 'discourse-embed-frame';
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iframe.width = "100%";
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iframe.frameBorder = "0";
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iframe.scrolling = "no";
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if (DE.discourseReferrerPolicy) {
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// See https://www.w3.org/TR/html5/semantics-embedded-content.html#the-iframe-element
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iframe.referrerPolicy = DE.discourseReferrerPolicy;
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}
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comments.appendChild(iframe);
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// Thanks http://amendsoft-javascript.blogspot.ca/2010/04/find-x-and-y-coordinate-of-html-control.html
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function findPosY(obj)
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{
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var top = 0;
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if(obj.offsetParent)
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{
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while(1)
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{
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top += obj.offsetTop;
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if(!obj.offsetParent)
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break;
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obj = obj.offsetParent;
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}
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}
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else if(obj.y)
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{
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top += obj.y;
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}
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return top;
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}
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function normalizeUrl(url) {
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return url.replace(/^https?(\:\/\/)?/, '');
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}
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function postMessageReceived(e) {
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if (!e) { return; }
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if (normalizeUrl(DE.discourseUrl).indexOf(normalizeUrl(e.origin)) === -1) { return; }
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if (e.data) {
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if (e.data.type === 'discourse-resize' && e.data.height) {
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iframe.height = e.data.height + "px";
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}
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if (e.data.type === 'discourse-scroll' && e.data.top) {
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// find iframe offset
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var destY = findPosY(iframe) + e.data.top;
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window.scrollTo(0, destY);
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}
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}
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}
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window.addEventListener('message', postMessageReceived, false);
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})();
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