Question

In my JSP, a hidden variable value shows as following.

<input type="hidden" name="" value="[1, 12, 2, 3, 4]" id="rollNumber"/> 

When I try to get hidden variable in javascript function by document.getElementById and put it in a array (rollNo) as follows:

rollNo = document.getElementById("rollNumber").value; 

rollNo value is coming as [1, 12, 2, 3, 4]

When I try to iterate rollNo it gives me elements as:

[
1
,
space
1
2
, 
space  etc... elements

I need only elements like '1 12 2 3 4'

Answer 1

you can do this by just using a simple regular expression

var text = document.getElementById("rollNumber").value; 
var pattern = /\d+/g // matches all instances of one or more digits
var result = text.match(pattern)

simple and elegant, is valid for all string containing digits, with any separators