I am learning Nodejs with node cookbook 2nd edition.
I like this book because it is teaching us with explaining sample code which looks very practical.
The example code is part of Browser-server transmission via AJAX part
Anyway the main question is that below is in the EX code, below is index.html file
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<script>
$.get("http://localhost:8080/profiles",function (profile_names) {
$.each(profile_names, function (i, pname) {
$("#profiles").append("<option>" + pname + "</option>");
});
}, "json");
$("#formats, #profiles").change(function () {
alert("2");
var format = $("#formats").val();
$.get("http://localhost:8080/profile/" + $("#profiles").val() + "." + format,
function (profile, stat, jqXHR) {
var cT = jqXHR.getResponseHeader("Content-Type");
$("#raw").val(profile);
$("#output").html('');
if (cT === "application/json") {
$.each($.parseJSON(profile), function (k, v) {
$("#output").append("<b>" + k + "</b> : " + v + "<br>");
});
return;
}
if (cT === "application/xml") {
profile = jqXHR.responseXML.firstChild.childNodes;
$.each(profile, function (k, v) {
if (v && v.nodeType === 1) {
$("#output").append("<b>" + v.tagName + "</b> : " + v.textContent + "<br>");
}
});
}
},
"text");
});
</script>
<style>
#frm, #raw {display:block; float:left; width:210px},
#raw {height:150px; width:310px; margin-left:0.5em}
</style>
<title> INDEX </title>
</head>
<body>
<form id="frm">
Profile: <select id="profiles">
<option> </option>
</select>
<br></br>
Format:<select id="formats">
<option value="json"> JSON </option>
<option value="xml"> XML </option>
</select>
<br></br>
<div id="output"></div>
</form>
<textarea id="raw"></textarea>
</body>
</html>
Second, server.js file
var http = require('http');
var fs = require('fs');
var path = require('path');
var profiles = require('./profiles');
var xml2js = require('xml2js');
var index = fs.readFileSync('index.html');
var routes, mimes = {xml: "application/xml", json: "application/json"}
function output(content, format, rootNode) {
if (!format || format === 'json') {
return JSON.stringify(content);
}
if (format === 'xml') {
return (new xml2js.Builder({rootName: rootNode})).buildObject(content);
}
}
routes = {
'profiles': function (format) {
return output(Object.keys(profiles), format);
},
'/profile': function (format, basename) {
return output(profiles[basename], format, basename);
}
};
http.createServer(function (request, response) {
var dirname = path.dirname(request.url),
extname = path.extname(request.url),
// $.get('http://localhost:8080/profile/' + $('#profiles').val() + '.' + format
basename = path.basename(request.url, extname);
extname = extname.replace('.', ''); //remove period
response.setHeader("Content-Type", mimes[extname] ||'text/html');
if (routes.hasOwnProperty(dirname)) {
response.end(routes[dirname](extname, basename));
return;
}
if (routes.hasOwnProperty(basename)) {
response.end(routes[basename](extname));
return;
}
response.end(index);
}).listen(8080);
below is profiles.js file
module.exports = {
ryan: {
name: "Ryan Dahl",
irc: "ryah",
twitter: "ryah",
github: "ry",
location: "San Francisco, USA",
description: "Creator of node.js"
},
isaac: {
name: "Isaac Schlueter",
irc: "isaacs",
twitter: "izs",
github: "isaacs",
location: "San Francisco, USA",
description: "Former project gatekeeper, CTO npm, Inc."
}
};
I think at index file $("#formats, #profiles").change(function () { is not working.
I just input alert("2"); to test the code but I have never seen the alert.
I also tried to change code like
$("#formats").change(function () {,
$("#profiles").change(function () {
Both of them were not working neither.
Can you let me know what is the reason?
Either wrap your client-code in a DOM ready statement or move it to the end of the <body>. Your script is being executed before the page has rendered.