| function go() { | |
| var userId = prompt('Username?', 'Guest'); | |
| checkIfUserExists(userId); | |
| } | |
| var USERS_LOCATION = 'https://SampleChat.firebaseIO-demo.com/users'; | |
| function userExistsCallback(userId, exists) { | |
| if (exists) { | |
| alert('user ' + userId + ' exists!'); |
| function copyFbRecord(oldRef, newRef) { | |
| oldRef.once('value', function(snap) { | |
| newRef.set( snap.value(), function(error) { | |
| if( error && typeof(console) !== 'undefined' && console.error ) { console.error(error); } | |
| }); | |
| }); | |
| } |
| // assumes you add a timestamp field to each record (see Firebase.ServerValue.TIMESTAMP) | |
| // pros: fast and done server-side (less bandwidth, faster response), simple | |
| // cons: a few bytes on each record for the timestamp | |
| var ref = new Firebase(...); | |
| ref.orderByChild('timestamp').startAt(Date.now()).on('child_added', function(snapshot) { | |
| console.log('new record', snap.key()); | |
| }); |
| /*************************************************** | |
| * Simple and elegant, no code complexity | |
| * Disadvantages: Requires warming all data into server memory (could take a long time for MBs of data or millions of records) | |
| * (This disadvantage should go away as we add optimizations to the core product) | |
| ***************************************************/ | |
| var fb = firebase.database.ref(); | |
| /** | |
| * @param {string} emailAddress |
| // Determine if an element is in the visible viewport | |
| function isInViewport(element) { | |
| var rect = element.getBoundingClientRect(); | |
| var html = document.documentElement; | |
| return ( | |
| rect.top >= 0 && | |
| rect.left >= 0 && | |
| rect.bottom <= (window.innerHeight || html.clientHeight) && | |
| rect.right <= (window.innerWidth || html.clientWidth) | |
| ); |
Visit the new improved script here! Smooth scroll to top of page (Improved!)
If you need a plain JavaScript function to add a smooth scrolling back to the top of the page, you can use this script.
<body> tag. Like this: <body id="top">onclick function to the link. Like this: <a href="#top" onclick="scrollToTop(); return false">Back to Top ↑</a>
| def fragmention(self, bookmark): | |
| # Normalize whitespace and encode text as UTF8 | |
| text = ' '.join(self.text.split()).encode('utf-8') | |
| url_parts = urlparse(bookmark.url) | |
| # If the URL has no path (i.e. http://google.com) add a "/" then append fragmention | |
| formatter = '%s/##%s' if not len(url_parts.path) else '%s##%s' | |
| fragmention_url = formatter % (url_parts.geturl(), urllib.quote_plus(text)) | |
| mkfifo $pipe | |
| cat $pipe | ffmpeg -y | |
| -loop 1 -i cover.png | |
| -i pipe:0 | |
| -c:v libx264 -preset ultrafast -pix_fmt yuv420p -minrate 6000k -maxrate 6000k -bufsize 12000k -b:v 6000k | |
| -r 30 -g 30 -keyint_min 60 -x264opts "keyint=60:min-keyint=60:no-scenecut" | |
| -s 1920x1080 -tune zerolatency | |
| -b:a 128k -c:a aac -ar 48000 | |
| -strict experimental | |
| -f flv rtmp://a.rtmp.youtube.com/live2/$broadcast_id |
| 'use strict'; | |
| /** | |
| * The default alphabet is 25 numbers and lowercase letters. | |
| * Any numbers that look like letters and vice versa are removed: | |
| * 1 l, 0 o. | |
| * Also the following letters are not present, to prevent any | |
| * expletives: cfhistu | |
| */ | |
| var ALPHABET = |
| /** | |
| * Fancy ID generator that creates 20-character string identifiers with the following properties: | |
| * | |
| * 1. They're based on timestamp so that they sort *after* any existing ids. | |
| * 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs. | |
| * 3. They sort *lexicographically* (so the timestamp is converted to characters that will sort properly). | |
| * 4. They're monotonically increasing. Even if you generate more than one in the same timestamp, the | |
| * latter ones will sort after the former ones. We do this by using the previous random bits | |
| * but "incrementing" them by 1 (only in the case of a timestamp collision). | |
| */ |
