Robert Dawson robertcdawson
robertcdawson
/ color_contrast_checker.js
Last active
September 16, 2020 07:55
Quickly visually estimate color contrast ratio of text within or over images.
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| // Run in console: | |
| const images = document.querySelectorAll('img'); | |
| images.forEach(image => { | |
| image.style.filter = "blur(5px) grayscale(1)"; | |
| }); | |
| // Or, make a bookmarklet: | |
| javascript:const images = document.querySelectorAll('img'); images.forEach(image => { image.style.filter = "blur(5px) grayscale(1)"; }); |
robertcdawson
/ index.html
Created
July 21, 2017 05:33
Recursion 101 Recursive function example // source https://jsbin.com/putuluv
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="description" content="Recursive function example"> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>Recursion 101</title> | |
| </head> | |
| <body> |
robertcdawson
/ gigasecond_birthdate.js
Created
October 4, 2015 00:43
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| // exercism.io exercise | |
| // This function takes a date and returns a new date set one billion seconds (or gigasecond; ~31.558 years) in the future. | |
| var Gigasecond = function(birthdate) { | |
| this.birthdate = birthdate; | |
| }; | |
| Gigasecond.prototype.date = function() { | |
| var gigasecondBirthday = new Date( this.birthdate.setSeconds( this.birthdate.getSeconds() + Math.pow(10, 9) ) ); | |
| var gigasecondBirthdayMidnight = gigasecondBirthday.setHours( 0, 0, 0, 0 ); | |
| var getDate = new Date(gigasecondBirthdayMidnight); |
robertcdawson
/ dna_to_rna.js
Created
September 29, 2015 05:51
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| // exercism.io exercise | |
| var toRna = function (dna) { | |
| 'use strict'; | |
| var rnaMap = { | |
| 'G' : 'C', | |
| 'C' : 'G', | |
| 'T' : 'A', | |
| 'A' : 'U' | |
| }; | |
| var rna = dna.replace(/G|C|T|A/gi, function(match){ |
robertcdawson
/ log_all_links.js
Last active
September 28, 2015 19:27
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| var links = document.getElementsByTagName('a'); | |
| var linkArray = Array.prototype.slice.call(links); | |
| for (var i = 0; i < linkArray.length; i++) { | |
| console.log(linkArray[i].href); | |
| } |
robertcdawson
/ diagram_module.js
Created
September 24, 2015 15:57
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| // ref 1: http://toddmotto.com/mastering-the-module-pattern/ | |
| // ref 2: https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/fillText | |
| // create basic diagram module (w/ "revealing module" pattern from ref 1) | |
| var D_ = (function() { | |
| // draw container | |
| var draw = function(label) { | |
| var canvas = document.getElementById('canvas'); | |
| if (canvas.getContext) { | |
| var ctx = canvas.getContext('2d'); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Lazy Loading without JavaScript</title> | |
| <style type="text/css"> | |
| /* Hide images on page load. */ | |
| #img1, #img2, #img3 { | |
| display: none; | |
| } | |
| /* Show images when targeted. */ |
robertcdawson
/ gist:e9e49e30027e66c19b23
Created
October 2, 2014 18:00
Tampermonkey script to close Amazon preview window with Esc key
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| // ==UserScript== | |
| // @name Close Amazon Preview with Esc Key | |
| // @namespace http://www.therobbiedshow.com/ | |
| // @version 0.1 | |
| // @description Close Amazon preview window when clicking the Esc key! | |
| // @match http://www.amazon.com | |
| // @include http://*/* | |
| // @copyright 2014+, Robert Dawson | |
| // @require http://code.jquery.com/jquery-latest.min.js | |
| // ==/UserScript== |
robertcdawson
/ calories_burned.js
Last active
August 29, 2015 14:02
Unminified script to get calories burned during exercise
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| /* | |
| * Instructions: | |
| * - Create a new bookmark and name it "Get Calories Burned!" | |
| * - Then, paste the following code into the URL field. | |
| * - At the prompt, enter your sex, age, weight, average heart rate during exercise, and exercise duration. | |
| * - E.g.: m 38 150 150 30 | |
| * Data source: http://fitnowtraining.com/2012/01/formula-for-calories-burned/ | |
| */ | |
| var getCalories = function() { | |
| var questions = prompt("Enter (separated by spaces):\n- Sex\n- Age (yrs)\n- Weight (lbs)\n- Avg heart rate (rpm)\n- Workout time (min)"); |
robertcdawson
/ calories_burned_bookmarklet.js
Last active
August 29, 2015 14:02
Bookmarklet to get calories burned
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| javascript:var getCalories=function(){var e=prompt("Enter (separated by spaces):\n- Sex\n- Age (yrs)\n- Weight (lbs)\n- Avg heart rate (rpm)\n- Workout time (min)");var t=e.split(" ");var n=t[0];var r=t[1];var i=t[2];var s=t[3];var o=t[4];var u=((r*.2017+i*.09036+s*.6309-55.0969)*(o/4.184)).toFixed(2);var a=((r*.074+i*.05741+s*.4472-20.4022)*(o/4.184)).toFixed(2);var f=n=="m"?u:a;return f};var setCalories=function(){alert("You burned "+getCalories()+" calories today!")}(); |
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