帶有js的兩個單選按鈕的HTML檢查值

Question

我的HTML中有兩個單選按鈕。 其中至少有一個值必須為“是”。 我想在用戶選擇第二個值時檢查值（如果為“是”，那么我們不在乎，如果為“否”，那么我們必須檢查第一個值是什么）。 我嘗試使用此JavaScript代碼，但是它不起作用。 有人可以幫我嗎？ 謝謝。

    <div class="form-row">
        <div class="form-group col-md-4">
            <label class="form-text">Show email.</label>
        </div>

        <div class="form-group col-md-8">
        <div class="btn-group btn-group-toggle" data-toggle="buttons">
            <label class="btn btn-secondary active">
                <input type="radio" name="email" id="yes" value="yes" autocomplete="off" checked="checked"> Yes
            </label>
            <label class="btn btn-secondary">
                <input type="radio" name="email" id="no" value="no" autocomplete="off"> No
            </label>
        </div>
        </div>
    </div>

    <div class="form-row">
        <div class="form-group col-md-4">
            <label class="form-text">Show number.</label>
        </div>

        <div class="form-group col-md-8">
        <div class="btn-group btn-group-toggle" data-toggle="buttons">
            <label class="btn btn-secondary active">
                <input type="radio" name="number" id="yes" value="yes" autocomplete="off" checked="checked"> Yes
            </label>
            <label class="btn btn-secondary">
                <input type="radio" name="number" id="no" value="no" autocomplete="off" onclick="check(this)"> No
            </label>
        </div>
        </div>
    </div>

        <script language='javascript' type='text/javascript'>
            function check(input) {
                if (document.getElementById('email').value == "no" && document.getElementById('number').value == "no") 
                {
                    input.setCustomValidity('One must be yes.');
                } else {
                    // input is valid -- reset the error message
                    input.setCustomValidity('');
                        }
                }
        </script>

Answer 1

我認為這樣可能有效：

        <label class="btn btn-secondary active">
            <input type="radio" name="email" id="firstRadioTrue" value="yes" autocomplete="off" checked="checked"> Yes
        </label>
        <label class="btn btn-secondary">
            <input type="radio" name="email" id="firstRadioFalse" value="no" autocomplete="off"> No
        </label> 
        <label class="btn btn-secondary active">
            <input type="radio" name="number" id="secondRadioTrue" value="yes" autocomplete="off" checked="checked"> Yes
        </label>
        <label class="btn btn-secondary">
            <input type="radio" name="number" id="secondRadioFalse" value="no" autocomplete="off"> No
        </label>



        <script language='javascript' type='text/javascript'>

        var radioTopOne = document.getElementById('firstRadioTrue');
        var radioTopTwo = document.getElementById('firstRadioFalse');

        var radioOne = document.getElementById('secondRadioTrue');
        var radioTwo = document.getElementById('secondRadioFalse');

        radioOne.addEventListener('click',function(){
            if(radioOne.checked == true && radioTopOne.checked == true){
                alert("BOTH TRUE");
            }
            else if(radioOne.checked == true && radioTopOne.checked == false){
                alert("TOP FALSE, BOT TRUE");
            };
        });
        radioTwo.addEventListener('click',function(){
            if(radioTwo.checked == true && radioTopTwo.checked == true){
                alert("BOTH FALSE");
            }
            else if(radioTwo.checked == true && radioTopTwo.checked == false){
                alert("BOT FALSE, TOP TRUE");
            }
        });




    </script>

Answer 2

當前，您沒有id “ email”的元素，也沒有id “ number”的元素。 您應該在if語句中為正在使用的兩個單選按鈕提供一個id ，可以用來檢查它們是否被選中（ HTMLInputElement.checked ）。 即使未選中input的值，它們也將始終相同。

  <div class="form-row"> <div class="form-group col-md-4"> <label class="form-text">Show email.</label> </div> <div class="form-group col-md-8"> <div class="btn-group btn-group-toggle" data-toggle="buttons"> <label class="btn btn-secondary active"> <input type="radio" name="email" id="showemailyes" value="yes" autocomplete="off" checked="checked"> Yes </label> <label class="btn btn-secondary"> <input type="radio" name="email" id="showemailno" value="no" autocomplete="off"> No </label> </div> </div> </div> <div class="form-row"> <div class="form-group col-md-4"> <label class="form-text">Show number.</label> </div> <div class="form-group col-md-8"> <div class="btn-group btn-group-toggle" data-toggle="buttons"> <label class="btn btn-secondary active"> <input type="radio" name="number" id="shownumberyes" value="yes" autocomplete="off" checked="checked"> Yes </label> <label class="btn btn-secondary"> <input type="radio" name="number" id="shownumberno" value="no" autocomplete="off" onclick="check(this)"> No </label> </div> </div> </div> <script language='javascript' type='text/javascript'> function check(input) { if (document.getElementById('showemailno').checked && document.getElementById('shownumberno').checked) { alert("One must be yes."); input.setCustomValidity('One must be yes.'); } else { // input is valid -- reset the error message input.setCustomValidity(''); } } </script>