下拉值取决于单选按钮选择

Question

我有两个 name='bb' 的单选按钮，我有 name='size' 的下拉按钮，应该有两个不同的选项取决于选中的单选按钮。

 Code below ---------------------------------------- <input type="radio" name="bb" id="bb" checked required="true" value="home" > <div>Home</div> <input type="radio" name="bb" id="bb" value="office"> <div>Office</div> <label>Size</label> <select name="bedroom" id="bedroom" style="color: #8E9092; /*height: 38px;width: 228px;*/" > For Home--- <option value="1 Bedroom (350 to 700 sq ft)">1 Bedroom (350 to 700 sq ft)</option> <option value="2 Bedroom (700 to 1300 sq ft)">2 Bedroom (700 to 1300 sq ft)</option> <option value="3 Bedroom (1300 to 2000 sq ft)">3 Bedroom (1300 to 2000 sq ft)</option> <option value="4 Bedroom (2000 to 3000+ sq ft)">4 Bedroom (2000 to 3000+ sq ft)</option> For Office-- <option value="">Choose size</option> <option value="Studio (400-600 sq ft)">Studio (400-600 sq ft)</option> <option value="Studio Alcove (600-700 sq ft)">Studio Alcove (600-700 sq ft)</option>

Answer 1

试试看：首先包含一个 jquery 库。

演示

html：

  <input type="radio" id="home" name="chk" value="1" checked>Home <br/>
  <input type="radio" id="office" name="chk" value="2" >Office<br/>
<br/>
  <select id="describe">
     <option name="name" value="1">Select from above</option>
  </select>

Jquery：

var listA = [{name:'1 Bedroom 350 to 700 sq ft', value:'1 Bedroom 350 to 700 sq ft'}, {name:'2 Bedroom 700 to 1300 sq ft', value:'2 Bedroom 700 to 1300 sq ft'}, {name:'3 Bedroom 1300 to 2000 sq ft', value:'3 Bedroom 1300 to 2000 sq ft'}];

var listB = [{name:'Studio 400-600 sq ft', value:'Studio 400-600 sq ft'}, {name:'Studio Alcove 600-700 sq ft', value:'Studio Alcove 600-700 sq ft'}];

$(document).ready( function() {
  $("input[name='chk']").on('change',function() {

      if($(this).is(':checked') && $(this).val() == '1')
      {
        $('#describe').empty()
        $.each(listA, function(index, value) {
         $('#describe').append('<option value="'+value.value+'">'+value.name+'</option>');
        });                  
      }
      else if($(this).is(':checked') && $(this).val() == '2')
      {
        $('#describe').empty()
        $.each(listB, function(index, value) {
         $('#describe').append('<option value="'+value.value+'">'+value.name+'</option>');
        }); 
      }
      else
      {

      }

  });
});  

Answer 2

****此代码将根据单选按钮的选择给出值。 我创建了动态下拉菜单，但这里是我提到的 static 选项。 希望这会有所帮助****

 function yourfunction(radioid) { if(radioid == 1) { document.getElementById('one').style.display = 'block'; document.getElementById('two').style.display = 'none'; document.getElementById('three').style.display = 'none'; } else if(radioid == 2) { document.getElementById('three').style.display = 'none'; document.getElementById('two').style.display = ''; document.getElementById('one').style.display = 'none'; } else if(radioid == 3) { document.getElementById('three').style.display = ''; document.getElementById('two').style.display = 'none'; document.getElementById('one').style.display = 'none'; } }

 <STRONG>Color</STRONG></br> <br> <INPUT TYPE='radio' NAME='grp2' VALUE='City0' onClick="javascript:return yourfunction(1)">Black <INPUT TYPE='radio' NAME='grp2' VALUE='City1' onClick="javascript:return yourfunction(2)">Red <INPUT TYPE='radio' NAME='grp2' VALUE='City2' onClick="javascript:return yourfunction(3)">Blue <br/> <div id = "one" style = "display:none"> <br/> Black <select name="school"> <option name="black" value="b1">black1</option> <option name="black" value="b2">black2</option> <option name="black" value="b3">black3</option> </select><br/> </div><br/> <div id = "two" style = "display:none"> Red <select name="school"> <option name="black" value="r1">red1</option> <option name="black" value="r2">red2</option> <option name="black" value="r3">red3</option> </select> </div> <div id = "three" style = "display:none"> Blue <select name="school"> <option name="black" value="bl1">black1</option> <option name="black" value="bl2">black2</option> <option name="black" value="bl3">black3</option> </select> </div>

Answer 3

动态加载和更新 select 选项：

<script type="text/javascript">
    var bedrooms = ['1 Bedroom (350 to 700 sq ft)','2 Bedroom (700 to 1300 sq ft)','3 Bedroom (1300 to 2000 sq ft)','4 Bedroom (2000 to 3000+ sq ft)'];
    var offices = ['Studio (400-600 sq ft)','Studio Alcove (600-700 sq ft)'];
    function setSelect(v) {
        var x = document.getElementById("bedroom");
        for (i = 0; i < x.length; ) { 
            x.remove(x.length -1);
        }
        var a;
        if (v=='homedd'){
            a = bedrooms;
        } else if (v=='officedd'){
            a = offices
        }
        for (i = 0; i < a.length; ++i) {
            var option = document.createElement("option");
            option.text = a[i];
            x.add(option);
        }
    }
    function load() {
        setSelect('homedd');
    }
    window.onload = load;

</script>
<input type="radio" name="bb" value="home"   onclick="setSelect('homedd')" checked > Home <br>
<input type="radio" name="bb" value="office" onclick="setSelect('officedd')" > Office <br>
<label>Size</label>
<select name="bedroom" id="bedroom" style="color: #8E9092; /*height: 38px;width: 228px;*/"  >
</select>