How to find out which checkboxes have been selected on the next page in VisualForce

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I have a data table which iterates through a custom object and generates checkboxes. On the second page, I want to determine which of these checkboxes have been selected.

In the VisualForce page:

 Age <apex:inputText value="{!age}" id="age" />
 <apex:dataTable value="{!Areas}" var="a">
      <apex:column >
      <apex:inputCheckbox value="{!a.name}" /> <apex:outputText value="{!a.name}" />
      </apex:column>
  </apex:dataTable>

In the Controller:

 public String age {get; set; }
  public List<Area_Of_Interest__c> getAreas() {
      areas = [select id, name from Area_Of_Interest__c];
      return areas;
  }

On my second page, I can retrieve the value that the user put in the textbox "age" by using {!age}. How Do I retrieve which checkboxes have been checked?

Thank you.

Best Answer

Ok, if you want to handle it with Javascript, use Pavel's method, otherwise use the following to do it via the controller. You must create a wrapper class for whatever you wish to track. I'm not sure how it works, but somehow if you name a boolean variable "selected" in your wrapper class, it is mapped to the checkbox. Below is the code:

So in your Visual force page, do:

<apex:dataTable value="{!Foos}" var="f">
    <apex:column >
        <apex:outputLabel value="{!f.foo.name}" /> <apex:inputCheckbox value="{!f.selected}" />
    </apex:column>
 </apex:dataTable>
 <apex:commandButton action="{!getPage2}" value="go"/>

In your Controller, do the following: 1) Make a Wrapper class with the boolean "selected", which somehow maps to the inputCheckbox selected:

public class wFoo {
    public Foo__c foo {get; set}
    public boolean selected {get; set;}

    public wFoo(Foo__c foo) {
        this.foo = foo;
        selected = false; //If you want all checkboxes initially selected, set this to true
    }
}

2) declare the list variables

public List<wFoo> foos {get; set;}
public List<Foo__c> selectedFoos {get; set;}

3) Define the accessor for the List

public List<wFoo> getFoos() {
    if (foos == null) {
        foos = new List<wFoo>();
        for (Foo__c foo : [select id, name from Foo__c]) {
            foos.add(new wFoo(foo));
        }
    }
    return foos;
}

4) Define the method to process the selected checkboxes and place them in a List for use on another page

public void processSelectedFoos() {
    selectedFoos = new List<Foo__c>();
    for (wFoo foo : getFoos) {
        if (foo.selected = true) {
            selectedFoos.add(foo.foo); // This adds the wrapper wFoo's real Foo__c
        }
    }
}

5) Define the method to return the PageReference to the next page when the submit button is clicked

public PageReference getPage2() {
    processSelectedFoos();
    return Page.Page2;
}
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