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[JavaScript] Font Size Larger/Smaller
source link: http://siongui.github.io/2016/02/27/javascript-font-size-larger-smaller/
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[JavaScript] Font Size Larger/Smaller
February 27, 2016
Make font size of your website larger/smaller via JavaScript.
First we implement button-like element by HTML and SCSS:
HTML
<div class="font-adjust"> <span id="font-larger">A+</span> <span id="font-smaller">A-</span> </div>
SCSS
.font-adjust { float: right; margin-right: 3px; span { &:hover {cursor: pointer;} padding: 5px 5px; background: #fff; border-radius: 4px; } }
When users click on A+/A-, make larger/smaller font size of div element whose class is .main-content:
JavaScript
var fl = document.getElementById("font-larger"); fl.onclick = function() { var contents = document.querySelectorAll(".main-content"); for (var i = 0; i < contents.length; i++) { var content = contents[i]; if (content.style.fontSize == "") { content.style.fontSize = "1.0em"; } content.style.fontSize = (parseFloat(content.style.fontSize) + 0.25) + "em"; } } var fs = document.getElementById("font-smaller"); fs.onclick = function() { var contents = document.querySelectorAll(".main-content"); for (var i = 0; i < contents.length; i++) { var content = contents[i]; if (content.style.fontSize == "") { content.style.fontSize = "1.0em"; } content.style.fontSize = (parseFloat(content.style.fontSize) - 0.25) + "em"; } }
References:
[1]font size larger/smaller · twnanda/twnanda@7233501 · GitHub
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