Hi,

 

You can do this by using the inherent feature in the view: 

 

Select your view --> All Properties --> Data -->  Category Filter/Search/Search Fuzzy/Search Exact Match.(There are many such options.Select according to your need)

 

For example if you want a Category Filter..Just write down the name of the field:  You can use sessionScope/requestScope for this(Eg. sessionScope.fieldName) .

 

For your second question you can use ajax which is provided by all text fields. For example if you select a text field you can go under typeAhead option and write down the formula. 

 

Hope this helps. 

 

Regards, 

CHINTAN P.