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June 28, 2017 09:31
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Live-Updating HTML-File using Node.js
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| <html> | |
| <head> | |
| <style> | |
| body { | |
| color: #000; | |
| font-family: Sans-serif, Helvetica; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h1>Hello World!</h1> | |
| <p> | |
| This is my first Node.js-Script! Cool right?<br> | |
| The HTML-File is automatically updating on changes!! Awesome!<br> | |
| You can try it by editing and saving the index.html-File! | |
| </p> | |
| <script type="text/javascript"> | |
| var source = new EventSource("checkReload"); | |
| source.onmessage = function(event) { | |
| console.log(event); | |
| if(event.data == 'reload') { | |
| window.location.reload(true); | |
| } | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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| var http = require('http'); | |
| var fs = require('fs'); | |
| var url = require('url'); | |
| var chokidar = require('chokidar'); | |
| var reload = false; | |
| var oldsize = 1; | |
| chokidar.watch('index.html') | |
| .on('change', function(file, stats){ | |
| if(stats.size != oldsize && stats.size !== 0 && oldsize !== 0){ | |
| reload = true; | |
| console.log('Change'); | |
| oldsize = stats.size; | |
| } | |
| }); | |
| http.createServer(function(request, response){ | |
| console.log(url.parse(request.url).pathname); | |
| if(url.parse(request.url).pathname == '/checkReload'){ | |
| response.writeHead(200, { | |
| 'Content-Type': 'text/event-stream', | |
| 'Cache-Control': 'no-cache', | |
| 'Connection': 'keep-alive' | |
| }); | |
| interval = setInterval(function() { | |
| if(reload) { | |
| response.write('data: reload\n\n'); | |
| console.log('Reload'); | |
| reload = false; | |
| } else { | |
| response.write('data: no-change\n\n'); | |
| } | |
| }, 1000); | |
| request.connection.addListener("close", function() { | |
| clearInterval(interval); | |
| }, false); | |
| } else { | |
| fs.readFile('index.html', function(err,data){ | |
| if(err){ | |
| response.writeHead(404, {'Content-Type': 'text/plain'}); | |
| console.error(err); | |
| } | |
| response.writeHead(200, {'Content-Type': 'text/html'}); | |
| response.end(data.toString()); | |
| }); | |
| } | |
| }).listen(8081); | |
| console.log('Server running at http://localhost:8081/') |
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