No-Library (pure JS), HTML, CSS, JavaScript
jQuery 3.4.1, HTML, CSS, JavaScript
SO: http://stackoverflow.com/q/12520751/570918
jQuery 1.9.1, HTML, CSS, JavaScript
Change class name on click in jQuery
Knockout.js 3.0.0, HTML, CSS, JavaScript
jQuery Compat (edge), HTML, CSS, JavaScript
jQuery (edge), HTML, CSS, JavaScript
jQuery 3.3.1, HTML, CSS, JavaScript
Knockout.js 3.4.2, HTML, CSS, JavaScript
http://stackoverflow.com/questions/8449824/how-to-pre-select-an-option-in-a-dropdown-knockout-js