dynamicAction.page

<apex:page controller="DynamicActionController">
  <apex:form >
    <apex:actionFunction name="refreshResults" reRender="searchResults" status="searchStatus"/>
    
    <apex:dataTable value="{!records}" var="rec" >
      <apex:column >
        <apex:inputCheckbox value="{!rec.checked}"  onchange="return refreshResults()"/>
      </apex:column>
      <apex:column style="text-align:right;">
        <apex:inputText value="{!rec.value}"  onchange="return refreshResults()"/>
      </apex:column>
    </apex:dataTable>
    
    <apex:outputPanel id="searchResults">
        <apex:actionStatus id="searchStatus" startText="合計値を再計算しています..."/>
        <apex:outputText value="{0, number, ###,###}">
          <apex:param value="{!total}"/>
        </apex:outputText> 円
    </apex:outputPanel>

  </apex:form>
</apex:page>

DynamicActionController.cls

public with sharing class DynamicActionController {
    public class MyClass {
        public Decimal value {get; set;}
        public Boolean checked {get;set;}
        
        public MyClass(Decimal value) {
           this.checked = false;
           this.value = value;
        }
    }
    public List<MyClass> records {get;set;}
    
    public DynamicActionController() {
        this.records = new List<MyClass>();
        this.records.add(new MyClass(10000));
        this.records.add(new MyClass(2345));
    }

    public Decimal getTotal() {
        Decimal total = 0;
        for(MyClass o : this.records) {
            if (o.checked) { total += o.value; }
        }
        return total;
    }

}