Hi there,
I am trying to create a dependent picklist in a visual force page.
The first lists the price range of books and the second then lists the author list.
But when I try to add items to the second list by the code:
str = [SELECT name,price__c,author__c,publisher__c FROM Novel__c WHERE price__c<100 AND author__c =:this.options1]

it gives me the following error
: Invalid bind expression type of System.SelectOption for column of type String at line 26 column 117

here's my controller code
public class class12
{

    public string options ;
    public List<selectOption> options1 = new List<selectoption>();
    public string options2;
    public List<Novel__c> str = new List<Novel__c>();
   
    public class12(ApexPages.StandardController controller)
    {

    }

    public List<Novel__c> getStr() {

            if(options=='Below 100')
            { 
                options1.clear();
                for(Novel__c n:[SELECT author__c FROM Novel__c WHERE price__c<100 ORDER BY author__c])
                { 
                    this.options1.add(new SelectOption(String.valueof(n.author__c),string.valueof(n.author__c)));
                }
                getItems2();
               
                str.clear();
                str = [SELECT name,price__c,author__c,publisher__c FROM Novel__c WHERE price__c<100 AND author__c =:this.options1];
                return str;
            }
            else if(options == 'Above 100'){
                options1.clear();
                for(Novel__c n:[SELECT author__c FROM Novel__c WHERE price__c<100 ORDER BY author__c])
                { 
                    this.options1.add(new SelectOption(String.valueof(n.author__c),string.valueof(n.author__c)));
                }
                getItems2();
                str.clear();
                str = [SELECT name,price__c,author__c,publisher__c FROM Novel__c WHERE price__c>=100 AND author__c =:this.options1];
                return str;
            }
           else{ 
                //getItems2(null);
                str.clear();
                return str;
           }
          
    }


    public List<SelectOption> getitems2()
    {
        return this.options1;
    }
    public List<Novel__c> getnovelList()
    {
        return [SELECT name,price__c,author__c,publisher__c FROM Novel__c WHERE price__c>100];
    }
    public string getoptions()
    {
        return this.options;
    }
    public void setoptions(String opt)
    {
        this.options = opt;
    }
    public string getoptions2()
    {
        return this.options2;
    }
    public void setoptions2(String opt)
    {
        this.options2 = opt;
    }
    public List<SelectOption> getItems()
    {
        List<SelectOption> options = new List<SelectOption>();
        options.add(new Selectoption('Below 100','Below 100'));
        options.add(new Selectoption('Above 100','Above 100'));      
        return options;
    }
    public pagereference preview()
    {
        return null;
    }
}
Is there any other way of adding a string variable in select list?
Thank you