Validation script to determine a "checkbox" state

checkbox-validate.js

//Validation for Sponsor in Application Edit/Show

function validate(){
    var hasSponsor = document.getElementById('hasSponsor');     //check box ID
    
    if (hasSponsor.checked){
        
        sponsorUrl = document.getElementById('sponsorUrl');     //sponsor URL field ID
        sponsorImage = document.getElementById('sponsorImage'); //sponsor Image field ID

        if ( sponsorUrl == null || sponsorUrl == "" ) {
            alert("You need to enter a Sponsor URL")
        }

        if ( sponsorImage == null || sponsorImage == "" ) {
            alert("You need to specify a Sponsor Image")
        }

        console.log("There is a Sponsor!!!") ;
    } else {
        
        console.log("There is no Sponsor...")

    }
}