I was looking at some jQuery code on a website and came across a line that confused me. What exactly does the + sign and spaces do in "url(" + imageUrl + ")"?
I am new to jQuery and JavaScript.
<!DOCTYPE html>
<html lang="en">
<head>
<title>jQuery Setting background-image CSS Property</title>
<style>
.box{
width: 500px;
height: 300px;
border: 5px solid #333;
}
</style>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script>
$(document).ready(function(){
// Set background image of a div on click of the button
$("button").click(function(){
var imageUrl = "images/sky.jpg";
$(".box").css("background-image", "url(" + imageUrl + ")");
});
});
</script>
</head>
<body>
<div class="box"></div>
<p><button type="button">Set Background Image</button></p>
</body>
</html><!DOCTYPE html>