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Fast and real-time extraction of web pages information (html, text, etc) using node-dom based on given criterias (example : retrieves real-time the price of a product)
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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)

Install :

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. 

Use :

getelements.js :

As a module :

    var getElements = require('node-bot').getElements;

    var $E=encodeURIComponent;

    var response={
        end:function(gadgets) {
            //output format, see below

    var params='search='+$E('nike shoes')'+'&name='+$E(nike_shoes)+'&regexp='+$E('\\$|€');


As a server/API :

    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 :

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

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

To call it from a script :

    var xscript=document.createElement('SCRIPT');
    var params='name=nike_shoes'+'&search='+$E(nike shoes nikestore)+'&regexp='+$E('\\$|€');

    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

Parameters :

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")

Output :

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.

Tests and API :

jCore server ( :

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

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

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