Please extend an 'in' operator.
$.extend($.fn.datagrid.defaults.operators, {
in: {
text: 'In',
isMatch: function(source, value){
source = String(source);
value = String(value);
var vv = value.split(',');
for(var i=0; i<vv.length; i++){
var v = $.trim(vv[i]);
if (v){
var index = source.toLowerCase().indexOf(v.toLowerCase());
if (index >= 0){
return true;
}
}
}
return false;
}
}
})
And then apply this 'in' operator to the field using the 'defaultFilterOperator' property.
dg.datagrid('enableFilter', [{
field: 'itemid',
type: 'textbox',
defaultFilterOperator: 'in'
}])