每当我在第一个下拉菜单中更改选项时，都需要jquery将第二个下拉菜单的默认选项更改为“选择”

Question

This is the the jquery i am using. 这是我正在使用的jQuery。 I am able to get "select" in district when i choose state but when i keep selecting different state again and again without touching district the values in district changes to the last option of each district. 当我选择状态时，我可以在区域中获得“选择”，但是当我一次又一次地选择不同的状态而又不触及区域时，区域中的值将更改为每个区域的最后一个选项。 I want default to be "select"(disabled) each time i change state. 我希望每次更改状态时默认为“选择”（禁用）。

<script>
  $(document).ready(function() {
    $('#select3').selectmenu('disable');
    $("#select2").change(function() {
      if ($(this).data('options') === undefined) {
        $(this).data('options', $('#select3 option').clone());
      }
      var id = $(this).val();
      var option = $(this).data('options').filter('[value=' + id + ']');
      $('#select3').html(option);
      $('#select3').selectmenu('refresh');
      $('#select3').selectmenu('enable');
    });
  });

 <body>
          <label for="select2">State:</label>
          <select name="select2" id="select2">
                <option value = "0">Select</option>
                <option value = "1">Maharashtra</option>
                <option value = "2">Gujarat</option>
                <option value = "3">Rajasthan</option>
           </select>

        <label for="select3">District:</label>
        <select name="select3" id="select3">
               <option value = "0">Select State</option>
               <option value = "1">Select</option>
               <option value = "1">Pune</option>                       
               <option value = "1">Vidarbha</option>
               <option value = "1">Thane</option>
               <option value = "2">Select</option>
               <option value = "2">Bharuch</option>
               <option value = "2">Ahmedabad</option>
               <option value = "2">Jamnagar</option>
               <option value = "3">Select</option>
               <option value = "3">Jaipur</option>
               <option value = "3">Jodhpur</option>
               <option value = "3">Bikaner</option>
           </select>
</body>

Answer 1

You can use CSS alone to hide the other values on page load, and then filter through the select3 options. 您可以单独使用CSS来隐藏页面加载时的其他值，然后通过select3选项进行过滤。 (You can't use your $(this).data('options').filter because this refers to #select2, not #select3, so the states options remain unchanged) （您不能使用$(this).data('options').filter因为this引用的是＃select2，而不是＃select3，因此状态选项保持不变）

 const select2 = $("#select2"); select2.change(() => { const stateVal = select2.val(); const select3Options = $('#select3').children(); select3Options.show(); select3Options.filter((_, elm) => elm.value && elm.value !== stateVal).hide(); select3Options[0].selected = 'selected'; });

 #select3 > option:not([value="0"]) { display: none; }

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <body> <label for="select2">State:</label> <select name="select2" id="select2"> <option value = "0">Select</option> <option value = "1">Maharashtra</option> <option value = "2">Gujarat</option> <option value = "3">Rajasthan</option> </select> <label for="select3">District:</label> <select name="select3" id="select3"> <option value = "0">Select State</option> <option value = "1">Pune</option> <option value = "1">Vidarbha</option> <option value = "1">Thane</option> <option value = "2">Bharuch</option> <option value = "2">Ahmedabad</option> <option value = "2">Jamnagar</option> <option value = "3">Jaipur</option> <option value = "3">Jodhpur</option> <option value = "3">Bikaner</option> </select> </body>

每当我在第一个下拉菜单中更改选项时，都需要jquery将第二个下拉菜单的默认选项更改为“选择”

问题描述

1 个解决方案

解决方案1
0 已采纳 2018-03-24 17:47:16

每当我在第一个下拉菜单中更改选项时，都需要jquery将第二个下拉菜单的默认选项更改为“选择”

问题描述

1 个解决方案

解决方案1 0 已采纳 2018-03-24 17:47:16

解决方案1
0 已采纳 2018-03-24 17:47:16