This is a very simple code share for accessing list elements passed to iRules LX.
When passing arguments to iRules LX sometimes you don't beforehand how many are being sent, so passing a list of n arguments is a logical solution.
The issue is how to access them.
Typically arguments are accessed using the code req.params()[0] for the first argument and req.params()[1] for the second etc.
When you pass a list, it ends up getting sent as a nested array, so using req.params()[0] will not work, it will retrieve all of the list elements as one. For example, a tcl list (set mylist {red green blue yellow) would return [ 'red', 'green', 'blue', 'yellow' ]
req.params()[1] would return 'undefined'
Fortunately the fix is an easy one, you just need to reference the nested element
req.params()[0][0] and req.params()[0][1] etc.
Using a simple for loop, you can iterate through all the list elements.
How to use this snippet:
Just add an extra array element when referencing the corresponding list element passed from TCL. Simples
Code :
// simple for loop to iterate through list elements passed from TCL
for (var i = 0; i < req.params()[0].length; i++) {
var foo = req.params()[0][i]
console.log('List element: ', foo);
}
