<apex:page standardController="Opportunity" extensions="CreateOpp" tabStyle="Opportunity">
             <apex:PageBlock>
            <apex:pageBlockSection title="Opportunity Information" columns="2">
                 <apex:inputField value="{!Opportunity.AccountId}">
                    </apex:inputField>
               <apex:inputField value="{!Opportunity.Text__C}" />
              <apex:commandLink action="{!SelectValPage}" target="_blank">Open</apex:commandLink>
                   <apex:inputfield value="{!Opportunity.Name}" />
                    <apex:inputField value="{!OppString.State__c}" />

                     <apex:inputField value="{!OppString.Country__c }" />
              </apex:pageblocksection >
        </apex:pageBlock>

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

public class CreateOpp{
Opportunity record;
Public Id selectVal{get;set;}
public CreateNewOpportunity(ApexPages.StandardController controller) {
        record = (Opportunity)controller.getRecord();
        selectVal= Apexpages.currentPage().getParameters().get('selectVal');
        record.Text__C = selectVal;
        }
 public PageReference SelectValPage()
    {
       PageReference pr = new PageReference('/apex/SelectValuePage?id='+record.AccountID);
       return pr;
    }
}

<apex:page standardController="Account" extensions="selectValController" sidebar="false" showHeader="No">
    <apex:includeLightning />

<apex:form id="myForm">
    <apex:PageBlock id="PageBlock">
    <apex:pageBlockSection columns="1" >
    <div id="lightning"/>
    <script>
    var accountId = "{!$CurrentPage.parameters.id}";

    $Lightning.use("c:LAPP", function() {
     var recordId = '{!$CurrentPage.parameters.recordId}';
        $Lightning.createComponent(
            "c:Lcomp",
            {"accountId" : accountId
             },
            "lightning",
            function(cmp) {
                console.log('component created');
                console.log(cmp);
                });
        });
    </script>

     </apex:pageBlockSection>
     <apex:pageblockButtons >
           <apex:commandButton value="Select" id="Select"  styleClass="hideButton"  action="{!goToprevPage}" />

     </apex:pageblockButtons>
     <apex:pageMessages />
    </apex:PageBlock>
   </apex:form>
</apex:page>

public PageReference goToprevPage()
{
selectedVal='Texting..';
PageReference pr = new PageReference('/apex/CreateOppPage?selectVal='+selectedVal );
return pr;
}