James Bachini

javascript

  • Building A Stellar Web Wallet With Blend

    Building A Stellar Web Wallet With Blend

    In this tutorial I’m going to show you how I built a web based wallet that can create Stellar addresses and deposit any funds to Blend Capital. James On YouTube Watch On YouTube: https://youtu.be/GbAy9f93eyE | Subscribe Blend is an overcollateralized lending protocol that enables lenders to earn yield on their deposits. The source code for…

  • A Simple Browser Resource Monitor

    A Simple Browser Resource Monitor

    This single index.html file can be uploaded to any web server, run locally, or accessed here: https://jamesbachini.com/misc/browser-resources.html It enables web developers to monitor browser resources over time and test different devices processing abilities. The dashboard first collects and presents fundamental system information, providing context about the environment in which the application operates. This data includes:…

  • React Hooks Tutorial | The 7 Most Important React Hooks

    React Hooks Tutorial | The 7 Most Important React Hooks

    React Hooks provide a way to manage state, side effects, references and more in functional components. In this tutorial, we’ll look at the seven most commonly used React hooks When You Would Use These React Hooks useStateImagine you have a piece of data in your component that might change, like a number for a counter…

  • Format JSON Tool

    Format JSON Tool

    A simple tool to lint and format JSON because I was fed up of using the ones covered in ads. Format JSON The Javascript code that makes this work is quite simple: It can be used to format outputs prior to displaying the results of API queries or any other JSON found wild around the…

  • Calculating CAGR in Python & JavaScript

    Calculating CAGR in Python & JavaScript

    The Compound Annual Growth Rate (CAGR) is a useful measure for assessing the mean annual growth rate of an investment or business metric over a specified period longer than one year. Unlike other growth metrics, CAGR smooths out the volatility, providing a clearer picture of how investments grow over time. In this guide, I’ll show…

  • DeFi Whale Watching Tutorial & Code

    DeFi Whale Watching Tutorial & Code

    Imagine if you could tap into the strategies of top investors and see where the smart money is allocating capital? Welcome to the world of DeFi whale watching, where tracking high net worth wallets can give you the edge and open up new Whale Watching Explained DeFi whale watching involves tracking the investments of “smart…

  • Javascript Smart Contracts

    Javascript Smart Contracts

    As an experiment I converted this Vyper token contract to a Javascript/Typescript syntax to see if we could make it easier for web developers to get up to speed with smart contract development. Solidity is the most popular smart contract language and it is already based losely on Javascript but there are plenty of syntax…

  • Search For Satoshi

    Search For Satoshi

    In 2008 an anonymous user with the alias Satoshi Nakamoto posted the original Bitcoin whitepaper to the Cryptography mailing list. Satoshi mined a lot of the early Bitcoin blocks and the rewards that are held in bitcoin wallets associated are estimated to be around 1 million BTC or 10 Billion USD. If Bitcoin eventually reaches…

  • Pop Under Code 2020

    Pop Under Code 2020

    Updated September 2020 This pop under code is used for running pop under traffic on your own site. It adds an onclick function to every link on the page which opens a new tab with the clicked link and changes the existing window (underneath) to a popped ad URL. Opening links in new tabs isn’t…

  • Vibrate Phone with Javascript

    Vibrate Phone with Javascript

    The following javascript uses the Vibrate API to make a phone vibrate when a page is loaded. You can time it with setTimeouts or onclick/onscroll if required. There’s more information available at: https://developer.mozilla.org/en-US/docs/Web/API/Navigator/vibrate This can be used to draw a users attention to the landing page or to create message effects etc.

  • REGEX | A Complete Guide With Examples

    REGEX | A Complete Guide With Examples

    Regexes are a powerful way to do search queries on a text string. They can be used to replace text, sanitize user inputs and much more. Contents Introduction to REGEX REGEX Cheatsheet REGEX Examples REGEX Javascript Code An Introduction to REGEX A REGEX or regular expression is used to match text strings in many programming…

  • Alert box on click through to offer

    Alert box on click through to offer

    The following example will allow you to create an alert box when the user clicks through from your landing page to the offer page. This can be useful to remind users of your offers value proposition, sign-up requirements (double-opt in?) or just to increase conversion rate on the offer end. A working demo is available…

  • Calculate distance between two geocooridnates

    Calculate distance between two geocooridnates

    Here is a javascript function to calculate the distance between two latitude and longitude coordinates. function deg2rad(deg) { return deg * (Math.PI/180) } function calcDistance(lat1,lon1,lat2,lon2) {   var R = 6371; // Radius of the earth in km   var dLat = deg2rad(lat2-lat1);   var dLon = deg2rad(lon2-lon1);   var a =     Math.sin(dLat/2) *…

  • Setting up Maxmind GEOIP2 Legacy Database with PHP or Javascript

    This is the php code I use to access geoip data from Maxmind’s geoip database: <?php $gpath = getcwd() . “/GeoIPCity.dat”; if (isset($_SERVER[‘HTTP_X_FORWARDED_FOR’])) { $myip = $_SERVER[‘HTTP_X_FORWARDED_FOR’]; } if (isset($_SERVER[‘REMOTE_ADDR’])) { $myip = $_SERVER[‘REMOTE_ADDR’]; } include(“./geoipcity.inc”); $gi = geoip_open($gpath,GEOIP_STANDARD); $record = geoip_record_by_addr($gi,$myip); $city = $record->city; $countrycode = $record->country_code; geoip_close($gi); echo ‘countrycode = “‘.$countrycode.’”; city =…

  • Passing Through Landing Page Variables

    This was inspired by another post which is well worth a read at: http://affplaybook.com/blog/affiliate-marketing/the-ultimate-guide-to-landing-page-tricks/ So many traffic sources provide you with tags such as {keyword} {countrycode} {device} etc. You can add these variables to your url so it would look something like: http://www.myserver.com/landingpage.htm?kw={keyword}&device={device} Then in the code to your landing page you can access these…

  • Redirection Methods and Referer Passing

    The following are some methods you can use to redirect users from one place to another. I generally use 301 redirects for anything where I want the referer passed through because this is the fastest. Double meta refresh for anything where blank referer is important and a custom script which incorporates the form submit redirect…

  • Resizing images and adjusting landing pages based on screen resolution

    So many browsers so many different screen resolutions. Here’s a way to modify html code based on the screen resolution of the browser. In this example I have changed an image but there is no reason why you cant change text, font size or even use it to redirect users who have mobile sized screens.…

  • Loading a conversion pixel on click through

    Mobile campaign optimisation throws up a number of issues in regard to tracking. One thing I’ve found really useful is to load a conversion pixel on click through from the landing page to the offer page. This can be a traffic source pixel which can then be used to give some indication of site/device/carrier quality…

  • Script.aculo.us – Interactive Landing Pages

    Interaction is key in modern web design and one of the tools I’ve found to be very helpful in making a more interactive environment is script.aculo.us It is basically a javascript inlcude which can provide you with a whole load of effects and functions to use on your landing pages. Check out a simple example…

  • Mixing php with javascrip – Heredoc

    My main issue with javascript is the fact it is full of ‘ and ” which can be a real pain when coding. I’ve started using a method called heredoc to set a start and end point, example below. // Heredoc string // $sstring = <<<TEST Hello World TEST; The word TEST could be anything…