Groovy Grails处理控制器参数

Question

I do an AJAX request from mt front-end with array as parameter. Example of the array:

arr = [13, 56, 43]

When in Grails controller I print params I get arr[]:[13, 56, 43] . However, when in front-end array consists of only one element ( arr = [25] , for instance), then in controller I get arr[]:32 . However, I need the parameter to be the list, like arr[]:[32] . How can I do that?

Answer 1

In the controller you can use

params.list('arr[]')

This will always return a list, with zero, one or more than one element, unlike the basic

params.'arr[]'

which gives you null if there are no arr[] parameter values, the single value if there is one, and a list if there is more than one.

Answer 2

I think In the controller you can use

List arr = []

arr = params.list

or

def arr
arr = params.list as List