I have a Google Drive folder filled with many audio files, and I want my website to play one at random when a user clicks a button. I have the logic setup already, and it's working if I manually enter the google drive links into my array like this:
var fileArray = ["https://docs.google.com/uc?export=open&id=XXXXXXX", "https://docs.google.com/uc?export=open&id=XXXXXXXXX"];
The problem is I have hundreds of files, and I update the Drive often so I want it to update by itself. Thus where the Google Drive API comes in. Unfortunately, I have now found myself going from 1 line of code to many lines of code and being totally lost. I have an API_KEY & CLIENT_ID. The documentation at Drive API -> Javascript Quickstart has a "handleAuthClick" function, but I don't want the user to have to sign in as they will never be making changes to the Drive. I don't even see anywhere it enters the folder ID which I don't understand. People talking about javascript origins, redirect uris, google picker api. The documentation at Drive API -> files.get has cURL & http files, and I've also seen people talking about json files storing information like service account details. Is it possible to just keep everything in my javascript script? Here is an example of some code I've tried:
<script src="https://apis.google.com/js/client:platform.js"></script>
<script type="text/javascript">
var fileArray = [];
const API_KEY = 'XXXXX';
const CLIENT_ID = 'XXXXX';
const CLIENT_SECRET = 'XXXXXX';
const REDIRECT_URI = 'https://developers.google.com/oauthplayground';
const DISCOVERY_DOC = 'https://www.googleapis.com/discovery/v1/apis/drive/v3/rest';
const { google } = require('googleapis');
const SCOPES = 'https://www.googleapis.com/auth/drive.metadata.readonly';
function getFileIDs() {
var folderId = 'XXXXXX';
let response;
try {
response = await gapi.client.drive.files.list({
'fileId': folderId,
'fields': 'files(id)',
});
for (var i = 0; i < files.length; i++){
var currentID = files[i].id;
var currentDriveLink = 'https://docs.google.com/uc?export=open&id=' + currentID;
fileArray.push(currentDriveLink);
}
}
}
</script>
I just want the minimum code to get to file.id, and then I can prepend the URL structure and push it to my array. Any thoughts are helpful thank you.
im very new to JavaScript so be patient.
I've been trying to scrape a site and get all the product URLs in a list that i will use later in other function like this:
url='https://www.fromuthtennis.com/frm/c-10-mens-tops.aspx'
var http = require('http-get');
var request = require("request");
var cheerio = require("cheerio");
function getURLS(url) {
request(url, function(err, resp, body){
var linklist = [];
$ = cheerio.load(body);
var links = $('#productResults a');
for(valor in links) {
if(links[valor].attribs && links[valor].attribs.href && linklist.indexOf(links[valor].attribs.href) == -1){
linklist.push(links[valor].attribs.href);
}
}
var extended_links = [];
linklist.forEach(function(link){
extended_link = 'https://www.fromuthtennis.com/frm/' + link;
extended_links.push(extended_link);
})
console.log(extended_links);
})
};
This does work unless you go to the second page of items like this:
url='https://www.fromuthtennis.com/frm/c-10-mens-tops.aspx#Filter=[pagenum=2*ava=1]'
var http = require('http-get');
var request = require("request");
var cheerio = require("cheerio"); //etc...
As far as i know this happens because the content on the page is loaded dynamically.
To get the contents of the page i believe i need to use PhantomJS because that would allow me to get the html code after the page has been fully loaded, so i installed the phantomjs-node module. I want to use NodeJS to get the URL list because the rest of my code is written on it.
I've been reading a lot about PhantomJS but using the phantomjs-node is tricky and i still don't understand how could i get the URL list using it because i'm very new to JavaScript or coding in general.
If someone could guide me a little bit i'd appreciate it a lot.
Yes, you can. That page looks like it implements Google's Ajax Crawling URL.
Basically it allows websites to generate crawler friendly content for Google. Whenever you see a URL like this:
https://www.fromuthtennis.com/frm/c-10-mens-tops.aspx#Filter=[pagenum=2*ava=1]
You need to convert it to this:
https://www.fromuthtennis.com/frm/c-10-mens-tops.aspx?_escaped_fragment_=Filter%3D%5Bpagenum%3D2*ava%3D1%5D
The conversion is simply take the base path: https://www.fromuthtennis.com/frm/c-10-mens-tops.aspx, add a query param _escaped_fragment_ who's value is URL fragment Filter=[pagenum=2*ava=1] encoded into Filter%3D%5Bpagenum%3D2*ava%3D1%5D using standard URI encoding.
You can read the full specification here: https://developers.google.com/webmasters/ajax-crawling/docs/specification
Note: This does not apply to all websites, only websites that implement Google's Ajax Crawling URL. But you're in luck in this case
You can see any product you want without using dynmic content using this url:
https://www.fromuthtennis.com/frm/showproduct.aspx?ProductID={product_id}
For example to see product 37023:
https://www.fromuthtennis.com/frm/showproduct.aspx?ProductID=37023
All you have to do is for(var productid=0;prodcutid<40000;productid++) {request...}.
Another approach is to use phantom module. (https://www.npmjs.com/package/phantom). It will let you run phantom command directly from your NodeJS app
I am trying to scan a folder for all .shp files and add them to my leaflet map as a layer. The problem I'm having is that AJAX doesn't appear to be able to scan a folder, rather it is only capable of searching for specific files. I need it to be able to scan the folder because the .shp files will be overwritten periodically with new file names and I don't know how many files will be there at a given time. If there are no files in the folder, I need a popup to notify that maps are unavailable (this works in the current website). The code for this section is provided below. I've tried using PHP, but I can't figure out how to incorporate that with JavaScript.
I'm not a programmer, but I have stumbled through developing our website on my own. You can view it here: http://hsvfms.azurewebsites.net/map.html
If I haven't provided enough information or have given this information out of context, please let me know. Also, check out the website and let me know what you think.
var noMaps = L.control ();
var profile01 = new L.LayerGroup();
var profile02 = new L.LayerGroup();
$.ajax({
type:"GET",
url:"Aldridge_Unet/",
success: function(data) {
$(data).find("a:contains(.shp)").each(function(){
var mapList=[];
var profile0 = new L.Shapefile(mapList[0],{color:'DarkCyan',fillOpacity:'0.5', opacity:'5', weight:'1'}).addTo(profile01);
var profile1 = new L.Shapefile(mapList[1],{color:'DarkCyan',fillOpacity:'0.5', opacity:'5', weight:'1'}).addTo(profile02);
})
},
error: function (xhr, status, error) {
if(xhr.status==404){
noMaps = L.control ({position:'bottomleft'});
noMaps.onAdd = function(map) { var div = L.DomUtil.create('div', 'info legend');
div.innerHTML += '<img src="Images/map_not_available.png" alt="legend" style="width:275px;height:75px;background-color:white">';
return div;};
}
}
});
var overlays = [{groupName:"Inundation Boundaries", expanded:false, layers:{"Max Value":profile01}},];
Cannot be done. JavaScript code cannot access the filesystem of the computer the browser is running in (let alone watch a path for changes).
AJAX (and fetch and similar techniques) are just ways of fetching information from another computer (the web server). If your question really is "when something changes in the web server, how can I update the clients?" then the answer is probably WebSockets, socket.io, and similar techniques.
I have a client that wants to pull the latest video in a specific Vimeo Portfolio. I can pull in the latest video on the entire account using JS like so:
http://codepen.io/buschschwick/pen/pgrmvg
var vimeoUserName = 'yellowboxfilms';
// Tell Vimeo what function to call
var videoCallback = 'latestVideo';
var oEmbedCallback = 'embedVideo';
// Set up the URLs
var videosUrl = 'http://vimeo.com/api/v2/' + vimeoUserName + '/videos.json?callback=' + videoCallback;
var oEmbedUrl = 'http://vimeo.com/api/oembed.json';
// This function puts the video on the page
function embedVideo(video) {
videoEmbedCode = video.html;
document.getElementById('embed').innerHTML = unescape(video.html);
}
// This function uses oEmbed to get the last clip
function latestVideo(videos) {
var videoUrl = videos[0].url;
// Get the oEmbed stuff
loadScript(oEmbedUrl + '?url=' + encodeURIComponent(videoUrl) + '&callback=' + oEmbedCallback);
}
// This function loads the data from Vimeo
function loadScript(url) {
var js = document.createElement('script');
js.setAttribute('type', 'text/javascript');
js.setAttribute('src', url);
document.getElementsByTagName('head').item(0).appendChild(js);
}
// Call our init function when the page loads
window.onload = function() {
loadScript(videosUrl);
};
But I want to pull a latest in a portfolio. I found the API Call, but I get an authorization error.
http://codepen.io/buschschwick/pen/jWLoWb
var latestVideo = function() {
var vimeoAPI = 'https://api.vimeo.com/users/414104/portfolios';
$.getJSON(vimeoAPI).done(function(data) {
console.log(data);
})
};
latestVideo();
I think it might need an oAuth token or something like that, but trying to find out how to pass that got me no where and I feel the Vimeo API Docs aren't helping either. Any help or guidance would be much appreciated. Thanks!
Here are Vimeo's authentication docs: https://developer.vimeo.com/api/authentication
You can generate a single token on your app page, or you can generate the token on a server.
Vimeo's token generation does not yet support client side authorization, so know that if you share the token in the client, anyone can take that token and make API calls.
You can reduce the risk by requesting read-only scopes, but that token will still have access to private data.
I want to crawl the page and check for the hyperlinks in that respective page and also follow those hyperlinks and capture data from the page
Generally, browser JavaScript can only crawl within the domain of its origin, because fetching pages would be done via Ajax, which is restricted by the Same-Origin Policy.
If the page running the crawler script is on www.example.com, then that script can crawl all the pages on www.example.com, but not the pages of any other origin (unless some edge case applies, e.g., the Access-Control-Allow-Origin header is set for pages on the other server).
If you really want to write a fully-featured crawler in browser JS, you could write a browser extension: for example, Chrome extensions are packaged Web application run with special permissions, including cross-origin Ajax. The difficulty with this approach is that you'll have to write multiple versions of the crawler if you want to support multiple browsers. (If the crawler is just for personal use, that's probably not an issue.)
If you use server-side javascript it is possible.
You should take a look at node.js
And an example of a crawler can be found in the link bellow:
http://www.colourcoding.net/blog/archive/2010/11/20/a-node.js-web-spider.aspx
Google's Chrome team has released puppeteer on August 2017, a node library which provides a high-level API for both headless and non-headless Chrome (headless Chrome being available since 59).
It uses an embedded version of Chromium, so it is guaranteed to work out of the box. If you want to use an specific Chrome version, you can do so by launching puppeteer with an executable path as parameter, such as:
const browser = await puppeteer.launch({executablePath: '/path/to/Chrome'});
An example of navigating to a webpage and taking a screenshot out of it shows how simple it is (taken from the GitHub page):
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('https://example.com');
await page.screenshot({path: 'example.png'});
await browser.close();
})();
We could crawl the pages using Javascript from server side with help of headless webkit. For crawling, we have few libraries like PhantomJS, CasperJS, also there is a new wrapper on PhantomJS called Nightmare JS which make the works easier.
There are ways to circumvent the same-origin policy with JS. I wrote a crawler for facebook, that gathered information from facebook profiles from my friends and my friend's friends and allowed filtering the results by gender, current location, age, martial status (you catch my drift). It was simple. I just ran it from console. That way your script will get privilage to do request on the current domain. You can also make a bookmarklet to run the script from your bookmarks.
Another way is to provide a PHP proxy. Your script will access the proxy on current domain and request files from another with PHP. Just be carefull with those. These might get hijacked and used as a public proxy by 3rd party if you are not carefull.
Good luck, maybe you make a friend or two in the process like I did :-)
My typical setup is to use a browser extension with cross origin privileges set, which is injecting both the crawler code and jQuery.
Another take on Javascript crawlers is to use a headless browser like phantomJS or casperJS (which boosts phantom's powers)
This is what you need http://zugravu.com/products/web-crawler-spider-scraping-javascript-regular-expression-nodejs-mongodb
They use NodeJS, MongoDB and ExtJs as GUI
yes it is possible
Use NODEJS (its server side JS)
There is NPM (package manager that handles 3rd party modules) in nodeJS
Use PhantomJS in NodeJS (third party module that can crawl through websites is PhantomJS)
There is a client side approach for this, using Firefox Greasemonkey extention. with Greasemonkey you can create scripts to be executed each time you open specified urls.
here an example:
if you have urls like these:
http://www.example.com/products/pages/1
http://www.example.com/products/pages/2
then you can use something like this to open all pages containing product list(execute this manually)
var j = 0;
for(var i=1;i<5;i++)
{
setTimeout(function(){
j = j + 1;
window.open('http://www.example.com/products/pages/ + j, '_blank');
}, 15000 * i);
}
then you can create a script to open all products in new window for each product list page and include this url in Greasemonkey for that.
http://www.example.com/products/pages/*
and then a script for each product page to extract data and call a webservice passing data and close window and so on.
I made an example javascript crawler on github.
It's event driven and use an in-memory queue to store all the resources(ie. urls).
How to use in your node environment
var Crawler = require('../lib/crawler')
var crawler = new Crawler('http://www.someUrl.com');
// crawler.maxDepth = 4;
// crawler.crawlInterval = 10;
// crawler.maxListenerCurrency = 10;
// crawler.redisQueue = true;
crawler.start();
Here I'm just showing you 2 core method of a javascript crawler.
Crawler.prototype.run = function() {
var crawler = this;
process.nextTick(() => {
//the run loop
crawler.crawlerIntervalId = setInterval(() => {
crawler.crawl();
}, crawler.crawlInterval);
//kick off first one
crawler.crawl();
});
crawler.running = true;
crawler.emit('start');
}
Crawler.prototype.crawl = function() {
var crawler = this;
if (crawler._openRequests >= crawler.maxListenerCurrency) return;
//go get the item
crawler.queue.oldestUnfetchedItem((err, queueItem, index) => {
if (queueItem) {
//got the item start the fetch
crawler.fetchQueueItem(queueItem, index);
} else if (crawler._openRequests === 0) {
crawler.queue.complete((err, completeCount) => {
if (err)
throw err;
crawler.queue.getLength((err, length) => {
if (err)
throw err;
if (length === completeCount) {
//no open Request, no unfetcheditem stop the crawler
crawler.emit("complete", completeCount);
clearInterval(crawler.crawlerIntervalId);
crawler.running = false;
}
});
});
}
});
};
Here is the github link https://github.com/bfwg/node-tinycrawler.
It is a javascript web crawler written under 1000 lines of code.
This should put you on the right track.
You can make a web crawler driven from a remote json file that opens all links from a page in new tabs as soon as each tab loads except ones that have already been opened. If you set up a with a browser extension running in a basic browser (nothing runs except the web browser and an internet config program) and had it shipped and installed somewhere with good internet, you could make a database of webpages with an old computer. That would just need to retrieve the content of each tab. You could do that for about $2000, contrary to most estimates for search engine costs. You'd just need to basically make your algorithm provide pages based on how much a term appears in the innerText property of the page, keywords, and description. You could also set up another PC to recrawl old pages from the one-time database and add more. I'd estimate it would take about 3 months and $20000, maximum.
Axios + Cheerio
You can do this with axios and cheerios. Check axios docs for response format.
const cheerio = require('cheerio');
const axios = require('axios');
//crawl
//get url
var url = 'http://amazon.com';
axios.get(url)
.then((res) => {
//response format
var body = res.data;
var statusCode = res.status;
var statusText = res.statusText;
var headers = res.headers;
var request = res.request;
var config = res.config;
//jquery
let $ = cheerio.load(body);
//example
//meta tags
var title = $('meta[name=title]').attr('content');
if(title == undefined || title == 'undefined'){
title = $('title').text();
}else{
title = title;
}
var description = $('meta[name=description]').attr('content');
var keywords = $('meta[name=keywords]').attr('content');
var author = $('meta[name=author]').attr('content');
var type = $('meta[http-equiv=content-type]').attr('content');
var favicon = $('link[rel="shortcut icon"]').attr('href');
}).catch(function (e) {
console.log(e);
});
Node-Fetch + Cheerio
You can do the same thing with node-fetch and cheerio.
fetch(url, {
method: "GET",
}).then(function(response){
//response
var html = response.text();
//return
return html;
})
.then(function(res) {
//response html
var html = res;
//jquery
let $ = cheerio.load(html);
//meta tags
var title = $('meta[name=title]').attr('content');
if(title == undefined || title == 'undefined'){
title = $('title').text();
}else{
title = title;
}
var description = $('meta[name=description]').attr('content');
var keywords = $('meta[name=keywords]').attr('content');
var author = $('meta[name=author]').attr('content');
var type = $('meta[http-equiv=content-type]').attr('content');
var favicon = $('link[rel="shortcut icon"]').attr('href');
})
.catch((error) => {
console.error('Error:', error);
});