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POHow to capture streaming results with Prototype Ajax.request
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<p>High Level Overview:</p> <p>I have a nodejs expressjs server that makes use of the PostgreSQL nodejs driver called pg. I have a html file served to the client browser that when you click a button invokes a expressjs route on my expressjs server. This route will select data out of a PostgreSQL database and return it to the client html file. The problem is the route emits a response for every row selected in the query to the database. All the client (html browser) gets is the first row. I can write to the nodejs console server side and get all the rows to be displayed, but obviously that does me know good on my webpage.</p> <p>Question: How do I get my client html file to write to console on the client for every row emitted out of my expressjs route /pg? My assumption was on the client that the onSuccess would be fired for every row emitted out of my expressJS route.</p> <p>NodeJS\ExpressJS Server File:</p> <pre><code>var express = require('express'); var pg = require('pg'); var app = express(); var MemoryStore = express.session.MemoryStore; var conString = "postgres://joe_user:password@localhost/dev_db"; var client = new pg.Client(conString); client.connect(); app.get('/home', function(req,res){ res.sendfile(__dirname + '/views/index.html'); }); app.use(express.bodyParser()); app.use(express.cookieParser()); app.use ( express.session ( { key: 'some-key', secret: 'some-We1rD sEEEEEcret!', cookie: { secure: true }, store: new MemoryStore({ reapInterval: 60000 * 10 }) } ) ); app.use ( function(err, req, res, next) { // logic console.error(err.stack); res.send(500, 'Something broke!'); } ); app.get('/pg', function(req, res) { var query = client.query("SELECT * FROM junk_data;"); //Returns 7000 rows with 8 columns total query.on('row', function(row) { res.send(row); console.log(row); } ); } ); process.on('uncaughtException', function (err) { console.log(err); }); app.listen(4000); </code></pre> <p>HTML File:</p> <pre><code><!DOCTYPE HTML> <html lang="en"> <head> <meta charset="utf-8"> <title>Demo: dojo/request/xhr</title>   </head> <body> <h1>Demo: dojo/request/xhr</h1> <p>Click the button below to see dojo/request/xhr in action.</p> <div> <button id="textButton2" onclick="SubmitPGRequest();">Call Express Route For PostgreSQL</button>  </div> <br /><br /> <div id="resultDiv"> </div>  <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/prototype/1.7/prototype.js"></script> <script> function SubmitPGRequest() { new Ajax.Request( '/pg', { method: 'get', onSuccess: function(response){  if(response.done) { alert('Done!'); }else { console.log(response.responseText);} }, onFailure: function(){ alert('ERROR'); } }); } </script> < </code></pre> <p>/body> </p>
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<node.js><prototypejs><prototype>
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