[SalesForce] display selected records of page 1 on page 2.Both pages share the same controller.How to do that

public class AccountSelectClassController1{

    //Our collection of the class/wrapper objects wrapAccount
    public List<wrapAccount> wrapAccountList {get; set;}
    public List<Account> selectedAccounts{get;set;}

    public AccountSelectClassController1(){
            String id = ApexPages.currentPage().getParameters().get('id');
            if(wrapAccountList == null) {
            wrapAccountList = new List<wrapAccount>();
            for(Account a: [select Id, Name,BillingState, Website, Phone from Account limit 10]) {
                // As each Account is processed we create a new wrapAccount object and add it to the wrapAccountList
                wrapAccountList.add(new wrapAccount(a));
            }
        }
    }

    public PageReference processSelected() {
    PageReference congratsPage = Page.WrapperAccountEXChild;
    congratsPage.setRedirect(true);
       selectedAccounts = new List<Account>();
         for(wrapAccount wrapAccountObj : wrapAccountList) {
            if(wrapAccountObj.selected == true) {
                selectedAccounts.add(wrapAccountObj.acc);
                 congratsPage.getParameters().put('id', wrapAccountObj.acc.id);


            }
        }
    return congratsPage;
    }

    // This is our wrapper/container class. In this example a wrapper class contains both the standard salesforce object Account and a Boolean value
    public class wrapAccount {
        public Account acc {get; set;}
        public Boolean selected {get; set;}

        public wrapAccount(Account a) {
            acc = a;
            selected = false;
        }
    }
}

Page 1 :

<apex:page controller="AccountSelectClassController1" sidebar="false">
    <script type="text/javascript">
        function selectAllCheckboxes(obj,receivedInputID){
            var inputCheckBox = document.getElementsByTagName("input");
            for(var i=0; i<inputCheckBox.length; i++){
                if(inputCheckBox[i].id.indexOf(receivedInputID)!=-1){
                    inputCheckBox[i].checked = obj.checked;
                }
            }
        }
    </script>
    <apex:form >
        <apex:pageBlock >
            <apex:pageBlockButtons >
                <apex:commandButton value="Show Selected Accounts" action="{!processSelected}" rerender="table2"/>
            </apex:pageBlockButtons>

            <apex:pageblockSection title="All Accounts" collapsible="false" columns="2">

                <apex:pageBlockTable value="{!wrapAccountList}" var="accWrap" id="table" title="All Accounts">
                    <apex:column >
                        <apex:facet name="header">
                            <apex:inputCheckbox onclick="selectAllCheckboxes(this,'inputId')"/>
                        </apex:facet>
                        <apex:inputCheckbox value="{!accWrap.selected}" id="inputId"/>
                    </apex:column>
                    <apex:column value="{!accWrap.acc.Name}" />
                    <apex:column value="{!accWrap.acc.BillingState}" />
                    <apex:column value="{!accWrap.acc.Phone}" />
                </apex:pageBlockTable>

            </apex:pageblockSection>
        </apex:pageBlock>
    </apex:form>

</apex:page>

Page 2 : 

<apex:page controller="AccountSelectClassController1">
  <apex:form >
    <apex:pageBlock >
       <apex:pageBlockTable value="{!selectedAccounts}" var="c" id="table2" title="Selected Accounts">
                    <apex:column value="{!c.Name}" headerValue="Account Name"/>
                    <apex:column value="{!c.BillingState}" headerValue="Billing State"/>
                    <apex:column value="{!c.Phone}" headerValue="Phone"/>
       </apex:pageBlockTable>
    </apex:pageBlock>
  </apex:form>
</apex:page>

Best Answer

Where multiple pages share the same controller the state established in one page is transferred to to the next page automatically. This allows things like multi-page wizards to be created.

But you have this setRedirect in your code:

congratsPage.setRedirect(true);

which:

This type of redirect performs an HTTP GET request, and flushes the view state, which uses POST. If set to false, the redirect is a server-side forward that preserves the view state if and only if the target page uses the same controller and contains the proper subset of extensions used by the source page.

So remove that line.

PS

This is all you should need in your method:

public PageReference processSelected() {
    selectedAccounts = new List<Account>();
    for (wrapAccount w : wrapAccountList) {
        if (w.selected) {
            selectedAccounts.add(w.acc);
        }
    }
    return Page.WrapperAccountEXChild;
}

with the second page able to access the view state created by the first page.

Related Topic