JAVASCRIPT

string to number javascript & remove text

str = str.replace(/[^0-9.]+/g, "");

string to number javascript & remove text

var str = "data-123";
str = str.replace("data-", "");

string to number javascript & remove text

var p = $( "p" ).last();
var offset = p.offset();
p.html( "left: " + offset.left + ", top: " + offset.top );