How to filter a picklist based on the selected value of some other picklist in salesforce

Question

我正在创建一个集成了salesforce SDK的android应用，在salesforce自定义对象中，我有两个选择列表（category__c和sub_category__c），如何根据 salesforce 中类别 _c 的选定值过滤sub_category_ c 。

Answer 1

Make onchange event for category__c picklist which will filter by criteria sub_category__c.

<apex:inputField value="{!category__c}" >
   <apex:actionSupport event="onchange" rerender="subCat">
</apex:inputField>
<apex:selectList value="sub_category__c" id="subCat">
    <apex:selectOptions value="{!filteredSubCategories}" />
</apex:selectList>

Where on controller

 public void getFilteredSubCategories(){
      public List<SelectOption>  result = new List<SelectOption>();
      for(SelectOption so : allSubCategories){ // dont forget to init allSubCategories in constructor
          if(someCriteriaMet) { // add logic
              result.add(so)    
          }
      }
      return result;
 }