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Fast and Real-time extraction of web pages information using node-dom (html,text,etc) based on given criterias


Node.js implementation of Extract Widget bot using, and

Real-time extraction of web pages information (html, text, etc) based on given criterias.

It can be used as a server or an API, then parameters are passed in the URL, or directly as an independant node.js module.

The difference with node-gadgets is that for performances reasons it does not return the full gadgets, only the relevant information (shopbot example : seeking for "nike lebron 9" will return real-time the price of the shoes on nike store's web site)

npm install node-bot


git clone
cd node-bot
npm link .

Complementary modules : node-ewa

 Note : node-ewa is not a public module for now, so you can only use node-bot's server/API mode. 
getelements.js :
var getElements = require('node-bot').getElements;
var $E=encodeURIComponent;
var response={
end:function(gadgets) {
//output format, see below
with node-googleSearch
var params='search='+$E('nike shoes')'+'&name='+$E(nike_shoes)+'&regexp='+$E('\\$|€')+'&nbmax=20';
without node-googleSearch
var params='url=,pdp,ctr-inline/cid-1/pid-417121/pgid-437002&search='+$E('nike shoes')'+'&name='+$E(nike_shoes)+'&regexp='+$E('\\$|€')+'&nbmax=20';
var http = require('http'),  
URL = require('url'),
getElements = require('node-bot').getElements;
var handleRequest = function (request, response) {
var qs = URL.parse(request.url);
if (qs.pathname == '/getelements'){

To call it directly :

with node-googleSearch

http://myserver:myport/getelements?name=nike_shoes&search='nikestore nike lebron9'&regexp=$|€&nbmax=20

without node-googleSearch

http://myserver:myport/getelements?url=,pdp,ctr-inline/cid-1/pid-417121/pgid-437002&name=nike_shoes&search='nikestore nike lebron9'&regexp=$|€&nbmax=20

Example with encoded parameters to retrieve the price of "lebron9" shoes on nike store :

with node-googleSearch lebron 9&regexp=\%24|€

without node-googleSearch lebron 9&regexp=\%24|€&nbmax=20

To call it from a script :

var xscript=document.createElement('SCRIPT');
var params='name=nike_shoes'+'&search='+$E(nike shoes nikestore)+'&regexp='+$E('\\$|€')+'&nbmax=20'; //add url parameter if you already know it (do not use node-googleSearch)
xscript.onload or onreadystatechange --> do what you have to do with the output

Output format (see more details below) : nike_shoes=(Array containing the gadgets) (where 'nike_shoes' does correspond to the parameter 'name')

So to use it you can do :
xscript.onload=function() {
var res=eval('nike_shoes'+this.shoe_number); //for example if the parameter name depends on some var in your code
if (res.length>0) {
or simply
if (nike_shoes.length>0) {

See example here : (see API code at the end of html file)

Note : if your regexp does contain "\" and if you pass it through a js var (Example above : $E('\\$|€')) make sure to double it.

Note2 : make sure that the encoding of your files/browsers is utf-8

url : the url of the site where you want to extract gadgets from, if absent the url is retrieved with node-googleSearch using the value of search string (example : "nikestore nike shoes" will return the first url returned by Google Search that matches this string).

name : the name that will become the name of the global var containing the output in its 'gadgets' property (example : nike_shoes.gadgets).

regexp : while building the DOM, node-dom will use that regular expression to detect the objects that you are looking for (example : regexp=$|€ --> you are looking for gadgets in the page that are related to a price in $ or €).

search : indicates that once the gadgets have been selected with the regexp, you can filter these gadgets based on the value of search field (example : "nikestore nike shoes" url can contain other products than shoes, node-bot will return only the results matching "nike shoes").

nbmax : important parameter for performances, the value does specify a limit for the weight of searched gadgets so node-bot does not spend a lot of time processing gadgets that are not relevant. The default value is 100, recommended value is 20.

The output is an Array of :

[gadget html,width,height,gadget name,reserved,base,price,html of regexp object]

No json format here for now for historical reasons and backward compatibility with existing projects (TODO later).

The first three parameters in the output are not filled by node-bot.

See documentation for more details.


jCore server ( :

Example with node-googleSearch : lebron 9&regexp=\%24|€&nbmax=20

Example without node-googleSearch : lebron 9&regexp=\%24|€&nbmax=20

You can use the API on jCore server : (if by any unforeseen reasons the server is down, please advise).

Links above might not return a correct result due to changes on nike store web site, then you can try :

Webble project : (quick test : click on OK, then on first link that appears)

Example of API code and use, retrieve real time the price of babyliss homelight product on different merchant sites : (click on "acheter maintenant" then wait for prices to be displayed in green)

See tests.txt in ./test