は、どのように私はグレード-11およびグレード-12の仕事がうまくいかなかっただけBSCSは、ユーザーが選ぶ選択問題を持っているので、助けてくれてありがとう、このJavaScriptを組み合わせるためにどのようにJavaScriptの

Question

でのonchange組み合わせること

document.getElementById('course').onchange = function() { 


if (["BSCS", "BSIT","BSHRM","BSBM","BSTM"].indexOf(this.value) > -1) { 
    document.getElementById("grade-11").setAttribute("disabled", true); 
    document.getElementById("grade-12").setAttribute("disabled", true); 


} 
else { 
    document.getElementById("grade-11").removeAttribute("disabled"); 
    document.getElementById("grade-12").removeAttribute("disabled"); 
    } 
} 




document.getElementById('course').onchange = function() { 


if (["STEM", "TOP","GAS","HUMSS"].indexOf(this.value) > -1) { 
    document.getElementById("first-year").setAttribute("disabled", true); 


    document.getElementById("second-year").setAttribute("disabled", true); 
    document.getElementById("third-year").setAttribute("disabled", true); 
    document.getElementById("fourth-year").setAttribute("disabled", true); 
    } else { 



document.getElementById("first-year").removeAttribute("disabled"); 


    document.getElementById("second-year").removeAttribute("disabled"); 
    document.getElementById("third-year").removeAttribute("disabled"); 
    document.getElementById("fourth-year").removeAttribute("disabled"); 
    } 
} 

Answer 1

これは動作するはずです（あなたのロジックに基づいて）：

document.getElementById('course').onchange = function() { 

if (["BSCS", "BSIT","BSHRM","BSBM","BSTM"].indexOf(this.value) > -1) { 
    document.getElementById("grade-11").setAttribute("disabled", true); 
    document.getElementById("grade-12").setAttribute("disabled", true); 
    document.getElementById("first-year").removeAttribute("disabled"); 
    document.getElementById("second-year").removeAttribute("disabled"); 
    document.getElementById("third-year").removeAttribute("disabled"); 
    document.getElementById("fourth-year").removeAttribute("disabled"); 

} else if (["STEM", "TOP","GAS","HUMSS"].indexOf(this.value) > -1) { 

    document.getElementById("first-year").setAttribute("disabled", true); 
    document.getElementById("second-year").setAttribute("disabled", true); 
    document.getElementById("third-year").setAttribute("disabled", true); 
    document.getElementById("fourth-year").setAttribute("disabled", true); 
    document.getElementById("grade-11").removeAttribute("disabled"); 
    document.getElementById("grade-12").removeAttribute("disabled"); 

    } else { 

    document.getElementById("grade-11").removeAttribute("disabled"); 
    document.getElementById("grade-12").removeAttribute("disabled"); 
    document.getElementById("first-year").removeAttribute("disabled"); 
    document.getElementById("second-year").removeAttribute("disabled"); 
    document.getElementById("third-year").removeAttribute("disabled"); 
    document.getElementById("fourth-year").removeAttribute("disabled"); 
    } 
}