java - Displaying dropdown list depends on selected value from other list -


i working on project in spring mvc 4 , should display 3 dropdown lists second list depends on selected value first list , third on selected value in second list.

i have defined enum:

public enum type{     a{          getlistofsubtypes(){...};          getlistofobjectsbysubtype(objectlist subtype){...};     },     b{          getlistofsubtypes(){...};          getlistofobjectsbysubtype(objectlist subtype){...};     c{          getlistofsubtypes(){...};          getlistofobjectsbysubtype(objectlist subtype){...};      } };

getlistofsubtypes produce list of sub types. getlistofobjectsbysubtype produce list of objects sub types.

is there way fetch directly in jsp file subtypes , objects type accordingly chosen type? or should have perform conversions in model?

the first dropdown displays "a,b,c" list expected by:

 <form:select class="form-control input-sm" path="task.type">      <form:options items="${types}"/>  </form:select>

means, page have 3 dropdons: type: a,b,c -> user choose type b. subtypes: in case of type 'b', list 4,5,6 objects: in case of sub type '6', list o7,o8.

thanks in advance, mike


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