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2 Answers

Kevin Korte
28,147 PointsYou should be able to do something like this
if( $(window).width() > 420 ) {
//Run this code when the screen width is wider than 420px
}

Lucas Krause
19,924 PointsDo you mean the DOMContentLoaded event used when register a callback function using the following code for example?
$(function(){ ... })
If you want to fire that event manually later instead of when the document is ready, you have to use $.holdReady()
.