Hi kanika,

I here by requesting you to ,Kindly help me out to achieve following functionalities in below code.

I am also providing code,please make modifications in the code according to requirements.
​
1.)Display all alphabets with command links on the account's table and upon click on any of the letter,account table should display account's records starting with the selected letter.

2.)If no account's records is selected and user clicks on opportunities/contacts check boxs then it should show error message that 'Choose atleast one account record to display opportunities' error message.Same is the case with contacts also.


3.)If no opportunities/contacts records are found for the selected account records, it should not display save opportunities/contacts button.
     In above screen shot,you can observe that no opportunities are are found for selected accounts and it was displaying save opportunities button under opportunities table.we need to avoid that  save opportunities button,if no opportunities are found for selected accounts.

please help me to achieve above mentioned functionalities in the below code.

Apex controller
===========

public class Acc_con_Opp_Details
{
    //list of collection of the wrapper class object
    public list<accountwrapper> actwrap           {set;get;}
    //list of collection of Account,contact and opportunity objects
    public list<Account>        accounts          {set;get;}
    public list<Account>        acts              {set;get;}
    public list<opportunity>    opts              {set;get;}
    public list<opportunity>    sopts             {set;get;}
    public list<contact>        cnts              {set;get;} 
    public list<contact>        snts              {set;get;}
    public boolean oppbox                         {set;get;}//used as check box for opportunity 
    public boolean conbox                         {set;get;}//used as check box for contact
    public boolean flag1                          {set;get;}//used in account page block  
    public boolean flag2                          {set;get;}//used in contact page block 
    public boolean flag3                          {set;get;}//used in opportunity page block
    public boolean checkallflag                   {set;get;}//used for header check box
    public Boolean oppError                       {set;get;}
    public Boolean conError                       {set;get;}
    //this variables are used for pagination purpose
    private integer totalRecs = 0;//stores no.of total records   
    private integer index = 0;//used for tracking offset
    private integer blockSize =5;//for setting size of page
    private String sortDirection = 'ASC';
    private String sortExp = 'Name';
    
    //in this constructor we are setting values to boolean values
    public Acc_con_Opp_Details()
    {
    flag1=true;
    flag2=false;
    flag3=false;
    oppError=false;
    conError=false;
    checkallflag = false;
    totalRecs = [select count() from Account];//returns total no.of account records 
    getactwrap();//calling getactwrap method.
    }
    public String sortExpression
    {
      get
      {
         return sortExp;
      }
      set
      {
        //if the column is clicked on then switch between Ascending and Descending modes
        if (value == sortExp)
          sortDirection = (sortDirection == 'ASC')? 'DESC' : 'ASC';
        else
          sortDirection = 'ASC';
          sortExp = value;
      }
    }

    public String getSortDirection()
    {
       //if not column is selected 
       if (sortExpression == null || sortExpression == '')
           return 'ASC';
       else
          return sortDirection;
    }

    public void setSortDirection(String value)
    {  
        sortDirection = value;
    }
    //this method displays first five records
    public void beginning()
    {    
        flag2 = false;
        flag3 = false;
        oppbox=false;
        conbox=false;
        checkallflag=false;
        index = 0;
        getactwrap();
    }
    //this method displays prevoius records
     public void previous()
    {    
        flag2 = false;
        flag3 = false;
        oppbox=false;
        conbox=false;
        checkallflag=false;
        index = index-blockSize;
        getactwrap();
    }
    //this method displays next records
   public void next()
    {    
        flag2 = false;
        flag3 = false;
        oppbox=false;
        conbox=false;
        checkallflag=false;
        index = index+blockSize;
        getactwrap();
    }
    //this method displays last remaining records
 public void end()
    {    
        flag2 = false;
        flag3 = false;
        oppbox=false;
        conbox=false;
        checkallflag=false;
        index = totalrecs - math.mod(totalRecs,blockSize);
        getactwrap();
    }  
    //this variable is used to enable or disable first and previous buttons
 public boolean prev{get
    {
        if(index == 0)
        return true;
        else
        return false;
    }  set;}
    //this variable is used to enable or disable next and last buttons
 public boolean nxt{get
    {
        if((index + blockSize) > totalRecs)
        return true;
        else
        return false;
    }   set;}
    //used to display opportunities and contacts w.r.t selected accounts
    public void  submit()
    {
        flag1=false;
        acts=new list<Account>();
        List<Boolean> acflagList = new List<Boolean>();
        for(accountwrapper aw:actwrap)
           {
            if(aw.acflag){
                acts.add(aw.acc);
                acflagList.add(aw.acflag);
           } 
        }
        if(acflagList.isEmpty()) {
           oppbox=false;
           conbox=false;
           flag2=false;
           flag3=false;
           oppError=false;
           conError=false;
        }
        
        //if we select contact check box,then it displays contacts for selected accounts 
      if(conbox)
      {
      
              snts=[select id,lastName,Department,account.name from contact where accountid IN:acts];
              if(snts.size()>0)
              {
                  flag3=true;
                  conError=false;
              }
              else
              {
                  for(accountwrapper aw : actwrap) {
                      if(aw.acflag) {
                          flag3=true;
                          conError = true;
                      }
                          //ApexPages.addmessage(new ApexPages.message(ApexPages.severity.WARNING,'contact records are not found for selected Accounts.'));
                    }
              }
         } else {
             flag3 = false;
         }
        //if we select opportunity check box,then it displays opportunities for selected accounts
      if(oppbox)
        {
              opts=[select id,name,stageName,leadsource,account.name from opportunity where accountId IN:acts];
              if(opts.size() >0)
              {
                  flag2=true;
                  oppError=false;
              }
              else       
              {    
                    for(accountwrapper aw : actwrap) {
                      if(aw.acflag) {
                          flag2=true;
                          oppError = true;
                      }
                          //ApexPages.addmessage(new ApexPages.message(ApexPages.severity.WARNING,'opportunity records are not found for selected Accounts.'));
                    }
              }
        } else {
            flag2 = false;
        }
    }
   //it hides contacts and dispalys opportunitites on uncheck of contact check box
   
    public void Hideandshowopp()
    {
     
        if(oppbox)
          {     
              submit();
          } else {
              flag2 = false;
          }
         
    }
   //  it hides opportunities and dispalys contacts on uncheck of opportunities check box 
     public void HideandshowCon()
    {
        if(conbox)
         {    
              submit();
          } else {
              flag3 = false;
          }
         
    }
   
    public void Hideandshowoppcon() {
        Hideandshowopp();
        Hideandshowcon();
    }
    
    //This method uses a simple SOQL query to return a List of Accounts
     public void getactwrap() {
         string sortFullExp = sortExpression  + ' ' + sortDirection;
         accounts = Database.Query('SELECT id,Name,phone FROM Account order by ' + sortFullExp + ' LIMIT :blockSize OFFSET :index');
         actwrap=new list<accountwrapper>();
       // As each Account is processed we create a new accountwrapper object and add it to the wrapper class(accountwrapper) list.
         for(account a:accounts)
        {
            actwrap.add(new accountwrapper(a));
        }
    }
    
    // this method  uses dml operation to edit the existing opportunities values or to insert new oppt values
    public void saveopps()
    {
        list<opportunity> opps=new list<opportunity>();
        opps.addAll(opts);
        upsert opps;
    }
    //his method  uses dml operation to edit the existing contact values or to insert new contact values
    public void savecons()
    {
       cnts = new list<contact>();
        cnts.addall(snts);
        upsert cnts;
    }
 //This is wrapper class which is collection of other class instances
  //here  wrapper class contains both the standard salesforce object Account and a Boolean value acflag   
 public class accountwrapper{
        public account acc{set;get;}
        public boolean acflag{set;get;}
             //In this contructor When we create a new accountwrapper object we pass a Account that is set to the acc property.
             // We also set the boolean value to false
        public accountwrapper(account a){
            acc=a;
            acflag=false;
        }
        
    }

}

vf page
======
<apex:page controller="Acc_con_Opp_Details" showHeader="false" docType="html-5.0">
    <script>
    function checkallflag(allCheckboxes) {
    
        var container = allCheckboxes;
        while (container.tagName != "TABLE") {
            container = container.parentNode;
        }
    
        var inputs = container.getElementsByTagName("input");
        var checked = allCheckboxes.checked;
        for (var i = 0; i < inputs.length; i++) { 
            var input = inputs.item(i);
            if (input.type == "checkbox") {
                if (input != allCheckboxes) {
                    input.checked = checked;
                }
            }
        }
        CallSubmitMethod();
    }
    </script>
    <apex:form >
    <apex:actionFunction name="CallSubmitMethod" action="{!submit}"/>
    <!--This block dispalying account record details-->
        <apex:outputPanel id="par">
        
           
    <apex:pageblock rendered="true">
        <apex:commandLink value="a"/>&nbsp;<apex:commandLink value="b"/>&nbsp;<apex:commandLink value="c"/>&nbsp;<apex:commandLink value="d"/>&nbsp;<apex:commandLink value="e"/>&nbsp;<apex:commandLink value="f"/>&nbsp;<apex:commandLink value="g"/>&nbsp;<apex:commandLink value="h"/>&nbsp;<apex:commandLink value="i"/>
        &nbsp;<apex:commandLink value="j"/>&nbsp;<apex:commandLink value="k"/>&nbsp;<apex:commandLink value="l"/>&nbsp;<apex:commandLink value="m"/>&nbsp;<apex:commandLink value="n"/>&nbsp;<apex:commandLink value="o"/>&nbsp;<apex:commandLink value="p"/>&nbsp;<apex:commandLink value="q"/>&nbsp;<apex:commandLink value="r"/>
        &nbsp;<apex:commandLink value="s"/>&nbsp;<apex:commandLink value="t"/>&nbsp;<apex:commandLink value="u"/>&nbsp;<apex:commandLink value="v"/>&nbsp;<apex:commandLink value="w"/>&nbsp;<apex:commandLink value="x"/>&nbsp;<apex:commandLink value="y"/>&nbsp;<apex:commandLink value="z"/>
            
    <apex:pageMessages ></apex:pageMessages>
    <apex:pageblocktable value="{!actwrap}" var="a">
        <apex:column >
            <apex:facet name="header">
                <apex:inputCheckbox onclick="checkallflag(this)" value="{!checkallflag}"/>
            </apex:facet>
            <!--<apex:facet name="header">Select</apex:facet>-->
             <apex:inputCheckbox value="{!a.acflag}">
                 <apex:actionSupport event="onchange" action="{!Hideandshowoppcon}" reRender="par"/>
             </apex:inputCheckbox>
        </apex:column>
        <!-- displays id,name and phone number for accounts-->
        <apex:column value="{!a.acc.id}"/>
        <apex:column >
         <apex:facet name="header">   
           
           <apex:commandLink action="{!getactwrap}" value="Name{!IF(sortExpression=='name',IF(sortDirection='ASC','▼','▲'),'▼')}">
             <apex:param value="name" name="column" assignTo="{!sortExpression}"></apex:param>
           </apex:commandLink>
         </apex:facet>
         <apex:outputLabel >{!a.acc.Name}</apex:outputLabel>
       </apex:column>
        <apex:column value="{!a.acc.phone}"/>
         </apex:pageblocktable>
        <!-- this buttons are used to paginate account records-->
      
        <apex:pageblockButtons location="top">
            <!--displays first five records-->
            <apex:commandButton value="first"  action="{!beginning}" disabled="{!prev}"/>
            <!--displays previous records-->
            <apex:commandButton value="previous"  action="{!previous}" disabled="{!prev}"/>
             <!--displays previous  next records-->
            <apex:commandButton value="next"  action="{!next}" disabled="{!nxt}"/>
            <!-- displays last records-->
            <apex:commandButton value="last"  action="{!end}" disabled="{!nxt}"/>                                    
        </apex:pageblockButtons>
         <!-- check boxs for opportunities and contacts-->
       
     <center>  <apex:inputCheckbox value="{!oppbox}">
     <apex:actionSupport event="onchange" action="{!Hideandshowopp}"/>
     </apex:inputCheckbox>Opportunities&nbsp;&nbsp;&nbsp;
         <apex:inputCheckbox value="{!conbox}">
         <apex:actionSupport event="onchange" action="{!HideandshowCon}"/>
         </apex:inputCheckbox>Contacts&nbsp;&nbsp;&nbsp;
       <!-- <apex:commandButton value="submit" action="{!submit}"/>-->
       </center>
    </apex:pageblock>
    <!--this block displays opportunity details-->
    
    <apex:pageblock rendered="{!flag2}">
       
   <apex:pageblocktable value="{!opts}" var="o">
        <apex:column >
             <apex:facet name="header">Opportunity Id</apex:facet>
            <apex:commandlink value="{!o.id}" Action="{!URLFOR($Action.opportunity.edit,o.Id)}"/>
        </apex:column>
        <apex:column value="{!o.account.name}" />
        <apex:column >
            <apex:facet name="header">Opportunity Name</apex:facet>
       <apex:inputtext value="{!o.name}" />
            </apex:column>
        <apex:column >
           <apex:facet name="header">Opportunity Stage</apex:facet> 
       <apex:inputtext value="{!o.stagename}"/>
        </apex:column>
       <apex:column >
         <apex:facet name="header">Opportunity Leadsource</apex:facet> 
        </apex:column>
        </apex:pageblocktable>
        <apex:pageMessage rendered="{!oppError}" severity="error" strength="1" summary="No Opportunites Found" />
        <apex:commandButton value="Save Opportunities" action="{!saveopps}"/>
    </apex:pageblock>
             
    <!--this block is used for displaying contact details -->
            
     <apex:pageblock rendered="{!flag3}">
         
     <apex:pageblocktable value="{!snts}" var="c">
        <apex:column >
            <apex:facet name="header">Contact Id</apex:facet>
            <apex:commandlink value="{!c}" Action="{!URLFOR($Action.contact.edit,c)}"/>
        </apex:column>
         <apex:column value="{!c.account.name}" />
        <apex:column >
             <apex:facet name="header">Contact Lastname</apex:facet>
            <apex:inputtext value="{!c.lastname}"/>
        </apex:column>
        <apex:column >
        <apex:facet name="header">Contact Department</apex:facet>
            <apex:inputtext value="{!c.Department}"/>
        </apex:column>
        </apex:pageblocktable>
        <apex:pageMessage rendered="{!conError}" severity="error" strength="1" summary="No Contacts Found" /> 
         <apex:commandButton value="Save Contacts" action="{!savecons}" />
    </apex:pageblock>
       
        </apex:outputPanel>
    </apex:form>
</apex:page>