javascript - 如何隐藏和显示另一个选择选项栏的选择选项

Question

我很乐意在下面找到这个挑战的解决方案。我想要一种情况，当我选择医生选项时，它会隐藏专家列表，当我选择专家时，它会显示专家列表。谢谢

    <tr><td colspan=2 ><strong>Doctor Locator</strong></td></tr>
         <tr><td>
             <?php
                    $doc = 'Doctors';
                    $spel = 'Specialist';
                    $medic = array($doc, $spel);
                    sort ($medic);
                    echo "<select>";
                    foreach ($medic as $m)
                    {
                    echo "<option value=\"$m\">$m</option>";
                    }
                    echo "</select> <br/> ";

            ?>

                <select name="txt_specialize" style="width: 400px; height: 25px">
            <?php
            $specialist = array('Surgeon','Neurosurgeon','','Neurologist','Occupational Medicine Physician','Ophthalmologist',
            'Oral and Maxillofacial Surgeon','Pathologist','Psychiatrist','Podiatrist','Nephrologist','Otolaryngologist',
            'Internal Medicine Physician','Gastroenterologist','Emergency Physicians','Hermatologist','Dermatologist',
            'Anesthesiologist','Immunologist','Orthopaedic Surgeon','Radiation Onconlogist','Gynaecologist','Dentist',
            'Optician','Cardiologist','Pediatrician','Urologist','Diagnostic Radiologist','Pulmonary Medicine Physician',
            'Rheumatologist','Plastic Surgeon');
                sort ($specialist);
                    foreach ($specialist as $s)
                    {
                    echo "<option value=\"$s\">$s</option>";
                    }
                    echo "</select>"

            ?>
            </td></tr>
            <tr><td>

Answer 1

您可以使用 jQuery 轻松地做到这一点。如果你给第一个选择一个“type”的id，你可以添加以下jQuery:

        $(document).ready(function(){

            $("select[name='txt_specialize']").hide();

            $("select#type").change(function(){
                if($(this).val() == 'Doctor')
                {
                    $("select[name='txt_specialize']").hide();
                }
                else
                    $("select[name='txt_specialize']").show();
            });

        });