How do I put a variable in a string using javascript

Question

How do I put a variable in a string in JavaScript?

Example:

$(\'#contactForm\').animate({\"marginLeft\": \"+=680px\"}, \"slow\");

I wou

Answer 1

var size = "680px";
$('#contactForm').animate({"marginLeft": "+="+size}, "slow");

Answer 2

You can use the + operator to concatenate your value in a variable to the "+=" string:

$('#contactForm').animate({"marginLeft": "+=" + size}, "slow");

Answer 3

var theWidth = "680px"
$('#contactForm').animate({marginLeft: "+=" + theWidth}, "slow");

Answer 4

As with most languages that don't have sigals, you can't perform interpolation, you have to concatenate multiple strings.

"foo" + "bar" + "baz"
"foo" + string_var + "baz"
"+=" + string_var + "px"