Can you make a "Switch" statement with expression of method "getElementByName" with check boxes with the same name? (JavaScript)

This is my function:

function finalOutput() {
var text, text2, q = document.getElementByName("checker").value;

switch(q){
    case 1:
        text = "my role is role1";
    break;
    case 2:
        text = "my role is role2";
    break;
    case 3:
        text = "my role is role3";
    break;
    case 4:
        text2 = "my parameter is parameter1";
    break;
    case 5:
        text2 = "my parameter is parameter2";
    break;
    case 6:
        text2 = "my parameter is parameter3";
    break;
    default:
    text = "Please check if you fill all details...";
    }
document.getElementById("output").innerHTML = text;
document.getElementById("output2").innerHTML = text2;
}

This is the checkboxes in html:

role1:  <input type="checkbox" id="1" onclick="selectOnlyThis(this.id)" 
value="1" name="checker"/> </br>
role2:  <input type="checkbox" id="2" onclick="selectOnlyThis(this.id)"         
value="2" name="checker"/> </br>
role3:  <input type="checkbox" id="3" onclick="selectOnlyThis(this.id)"     
value="3" name="checker"/> </br>
parameter1:  <input type="checkbox" id="4" 
onclick="selectOnlyThis2(this.id)" value="4" name="checker" /> </br>
parameter2:  <input type="checkbox" id="5" 
onclick="selectOnlyThis2(this.id)" value="5" name="checker" /> </br>
parameter3:  <input type="checkbox" id="6" 
onclick="selectOnlyThis2(this.id)" value="6" name="checker" />

I want that the switch will get the value of each checkbox and will do what im told him accordingly. I think that the problem is with the cases of switch but not sure. I tried to do it with "if" but couldn't make it work.