取消按鈕無法確認畫面

Question

我試圖驗證在JavaScript單選按鈕，這是我的代碼：

if (document.ExamEntry.GCSE.checked == true) { 
    confirm("You have selected GCSE. Is this correct?"); 
} 
if (document.ExamEntry.AS.checked == true) { 
    confirm("You have selected AS. Is this correct?"); 
} 
if (document.ExamEntry.A2.checked == true) { 
    confirm("You have selected A2. Is this correct?"); 
} 

確認畫面顯示出來，然後點擊「提交」，成功地把你帶到下一個頁面，但取消按鈕似乎不起作用 - 當我希望它保留在頁面上時，它會將您帶到下一頁，以便您可以更改選項。

我嘗試過的東西，如返回結果; 結果= false

他們要麼不工作，要麼他們這樣做，反之亦然，這樣取消按鈕的工作方式就是停留在同一頁面上，但這也會發生在提交按鈕上。

Answer 1

var gcse = true, 
    as = true, 
    a2 = true; 

if (document.ExamEntry.GCSE.checked == true) { 
    gcse = confirm("You have selected GCSE. Is this correct?")); 
} 

if (document.ExamEntry.AS.checked == true) { 
    as = confirm("You have selected AS. Is this correct?"); 
} 

if (document.ExamEntry.A2.checked == true) { 
    a2 = confirm("You have selected A2. Is this correct?"); 
} 

if (gcse && as && a2) { 
    // you're golden 
    window.location.href = 'otherpage' 
} 

Answer 2

查看confirm的文檔。它說，

結果是指示是否正常或選擇取消（true表示OK）一個布爾值

這意味着每個線路都應該檢查返回值。簡明的方式來做到這一點，例如：

if (!confirm("You have selected A2. Is this correct?")) { 
    // event.cancel = true, or whatever you need to do on your side to cancel 
} // otherwise fall through and do what you're doing. 

因爲它是現在，因爲你從來不看的confirm返回值，所以你總是通過你的「成功」的情況下下降。

Answer 3

if (document.ExamEntry.GCSE.checked == true) { 
    if(confirm("You have selected GCSE. Is this correct?")) { 
     // do something 
    } 
} if (document.ExamEntry.AS.checked == true) { 
    if(confirm("You have selected AS. Is this correct?")) { 
     // do something 
    } 
} 
if (document.ExamEntry.A2.checked == true) { 
    if(confirm("You have selected A2. Is this correct?")) { 
     //do something 
    } 
}