text: Q:
  
  Change value in input component on rerendering
  
  I have an <apex:dataTable value="{!dtos}" var="dto">. There I have 
  <apex:column>
    <apex:facet name="header">rrr</apex:facet>
    <apex:outputPanel id="rrr">
      <apex:selectList id="rrrr" value="{!dto.rrr}" multiselect="false" size="1">
        <apex:selectOptions id="rrrrr" value="{!rrrrr}"/>
        <apex:actionSupport id="rrrrrr" event="onchange"  immediate="false"
                            reRender="ddd, ccc"
                            status="actionStatus"/>
      </apex:selectList>
    </apex:outputPanel>
  </apex:column>
  
  and two more guys
  <apex:column>
    <apex:facet name="header">Description</apex:facet>
    <apex:outputPanel id="ddd">
      <apex:input value="{!dto.ddd}" type="text"
                  id="dddd"/>
    </apex:outputPanel>
  </apex:column>
  
  <apex:column>
    <apex:facet name="header">Cost Rate</apex:facet>
    <apex:outputPanel id="ccc">
      <apex:outputText value="{0, number, currency}">
        <apex:param value="{!dto.cccc}"/>
      </apex:outputText>
    </apex:outputPanel>
  </apex:column>
  
  So. Description is not updated on picklist change and Cost Rate is.  
  In controller I have  
  class DTOClass {
    public String rrr {
      get;
      set {
        if (rrr != value) {
          rrr = value;
          ddd = 'asdf';
          ccc = 13;
        }
      }
    }
  }
  
  A:
  
  You need to create an apex method in controller. On change of picklist try like below-
  <apex:actionSupport event="onchange" action="{!apexMethodName}" rerender="ddd,ccc"/>
  
  and set the value of Description and Cost Rate in controller method.
  
  