How can I use the browser module to adapt the xml2js node module for the browser?
I am learning nodejs with Noodcook 2nd edition book.
In Chapter 3, Sending Serialized Data from Client to Server,
I ran into an obstacle.
below is the add_profile_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('add_profile_index.html');
var clientXml2js = fs.readFileSync('./xml2js.js');
var routes, mimes = {
js: "application/javascript",
json: "application/json",
xml: "application/xml"
};
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 = routes = {
'profiles': function (format) {
return output(Object.keys(profiles), format);
},
'/profile': function (format, basename) {
return output(profiles[basename], format, basename);
},
'xml2js' : function(ext) {
if (ext === 'js') { return clientXml2js; }
}
};
function updateProfiles(profile, type, cb) {
var name = Object.keys(profile).pop();
profiles[name] = profile[name];
cb(output(profiles[name], type, name));
}
function addProfile(request, cb) {
var pD = ''; //post data
request
.on('data', function (chunk) { pD += chunk; })
.on('end',function() {
var contentType = request.headers['content-type'];
if (contentType === 'application/json') {
updateProfiles(JSON.parse(pD), 'json', cb);
}
if (contentType === 'application/xml') {
xml2js.parseString(pD, {
explicitRoot: false,
explicitArray: false
}, function(err, obj) {
updateProfiles(obj, 'xml', cb);
});
}
});
}
http.createServer(function (request, response) {
var dirname = path.dirname(request.url),
extname = path.extname(request.url),
// Return the last portion of a path. (optional-extname: return only file name on mattached ext)
basename = path.basename(request.url, extname);
console.log("URL: "+request.url);
console.log("dirname:"+dirname);
console.log("extname:"+extname);
console.log("basename:"+basename);
console.log("");
extname = extname.replace('.', ''); //remove period
if (request.method === 'POST') {
addProfile(request, function(output) {
response.end(output);
});
return;
}
response.setHeader("Content-Type", mimes[extname] ||'text/html');
// If the subroute exists in the routes object, we call the method stored at that namespace passing in basenameand extname
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);
and below is the add_profile_index.html file
<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<style>
#frm, #raw {display:block; float:left; width:210px}
#raw {height:150px; width:310px; margin-left:0.5em}
#add {display:block; float:left; margin-left:1.5em}
#add div {display:table-row}
#add label {float:left; width:5.5em}
div button {float:right}
</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>
<form id="add">
<div><label>profile name</label><input name="profileName"> </input></div>
<div><label>name</label><input name="name"></input></div>
<div><label>irc</label><input name="irc"></input></div>
<div><label>twitter</label><input name="twitter"></input></div>
<div><label>github</label><input name="github"></input></div>
<div><label>location</label><input name="location"></input></div>
<div><label>description</label><input name="description"></input></div>
<div><button>Add</button></div>
</form>
<script src="xml2js.js"></script>
</body>
<script>
function load(done) {
$.get('http://localhost:8080/profiles',
function (profile_names) {
$.each(profile_names, function (i, pname) {
$('#profiles').append('<option>' + pname + '</option>');
});
done && done();
},
'json');
}
load();
$('#add').submit(function(e) {
var output, obj = {}, format = $('#formats').val(), profileName;
e.preventDefault();
$.each($(this).serializeArray(), function(i, nameValPair) {
obj[nameValPair.name] = nameValPair.value; //form an object
});
profileName = obj.profileName;
delete obj.profileName;
obj = {_: obj};
obj[profileName] = obj._;
delete obj._;
output = (format === 'json') ? JSON.stringify(obj) :
(new xml2js.Builder({rootName: profileName})).buildObject(obj);
$.ajax({
type: 'POST',
url: '/', data: output,
contentType: 'application/' + format, dataType: 'text',
success: function(response) {
$('#raw').val(response);
$('#profiles').html('<option></option>');
load(function () {
$('#profiles').val(profileName);
});
}
});
});
</script>
</html>
Before starting the server, we need to enter the command below
npm -g install browser
browse node_modules / xml2js -s xml2js -o xml2js.js
I think I am just following the book to generate the example code, but
the above code doesn't work, especially when working with XML format. I think the problem is with the browser.
I have looked at https://www.npmjs.org/package/browserify to understand the browser, but I find it very difficult to understand and use the module correctly.
Can you tell me what the problem is?
Thank!
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I found the answer myself.
The main problem was browsing node_modules / xml2js -s xml2js -o xml2js.js
He did not work.
So, we need to adapt the new browser module.
First make any javascript file (xml2jsM.js) containing below code. 'use strict';
var _ = require('xml2js');
var logUnderscoreVersion = function() {
console.log(_.VERSION);
}
module.exports = logUnderscoreVersion;
and then install the underline module. (npm set underscore)
and then create a package file. (rename xml2jsM.js> bundle.js)
and then include in add_profile_index.html
(You can link these steps at http://lincolnloop.com/blog/untangle-your-javascript-browserify/ )
If you have any questions, please let me know.
Thank you ~
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I managed to find some examples here http://opennodes.arecord.us/md/xml2js.md to see if the examples are helpful to you.
Try something like this?
Instead
(new xml2js.Builder({rootName: profileName})).buildObject(obj);
Try:
var xml2js = require('xml2js');
var builder = new xml2js.Builder({rootName: profileName}));
builder.buildObject(obj);
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