In this lab, I followed the instruction from JavaScript30 and recreated the Geolocation activity. First off, I made the HTML, CSS, and JavaScript files. Secondly, the <html>, <head>, <body>, <meta>, and <title> tags were already inserted in the HTML file. Thirdly, I typed in <link rel="stylesheet" type="text/css" href="Lab_35.css"> inside the <head> tags to link the CSS file with my HTML file. Fourthly, I typed in <script src="Lab_35.js" type="text/javascript"></script> inside the <body> tags which linked my JavaScript file with my HTML file. Inside the <body> tags, I typed the heading for the lab which has my name, date, and lab number with <div id="heading"><h1>Lab 35</h1><h2>Wei Jian Zhen</h2><h3>12/24/2019</h3></div>. After that, I typed in <svg>, <h1>, and <span> tags that create a compass for the geolocater. Lastly, I made the copyright notice with <p> and <div> tags. For the CSS I did html {width: 100%; height: auto;} body {background-color: #00FFA8; min-width: 100%; min-height: 100%;} to give the webpage a background color and make the webpage responsive to screen size changes. #heading {text-align: center; font-size: 16px;} to center the heading of the lab. #copyright {font-size: 16px; font-family: Baskerville, "Palatino Linotype", Palatino, "Century Schoolbook L", "Times New Roman", "serif"; font-weight: normal; padding-left: 1%; padding-right: 1%;} to change the font of the copyright notice. After that, I typed in .arrow {width: 250px;overflow: hidden;transition: all 0.2s;transform: rotate(0deg);display: inline-block;} .units {font-size: 15px;} which makes the arrow for the Geolocation. For the JavaScript:
const arrow = document.querySelector('.arrow');
const speed = document.querySelector('.speed-value');
navigator.geolocation.watchPosition((data) => {
console.log(data);
speed.textContent = data.coords.speed;
arrow.style.transform = `rotate(${data.coords.heading}deg)`;
}, (err) => {
console.error(err);
});
which makes the Geolocation get the location. Knowing how to use a geolocater is useful for collecting data from users from a website.
Link:
http://techteach.us/Web2020/ZWeiJian/WCP/Labs/Lab_35/Lab_35.html
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