Why parameterized SQL view taking only default values in geoserver

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geoserver

Openlayers

Hi,
i have list of id which i want to pass to geoserver and zoom to those extent in openlayers 3.

this is the view i am creating :

SELECT * FROM hospitals WHERE gid IN (%list%)

validation is ^[\d,]+$
i have mentions some default ids so it zooming to those deafult values.

What I have tried:

var viewparams = 'ids:1\\,2\\,3';

passing values like this