防止在三个不同的下拉列表中选择相同的值

更新时间：2023-02-01 13:12:51

尝试这个：

HTML

 < select id =select1name = indication_subject [] &GT; 
< option value =selected =selected> a< / option> 
< option value =1>会计与LT; /选项&GT; 
< option value =2>南非荷兰语&LT; /选项&GT; 
< option value =3>应用信息与通信技术< / option> 
< option value =4>阿拉伯&LT; /选项&GT; 
< option value =5>艺术与设计< / option> 
< option value =6>生物学和LT; /选项&GT; 
< option value =7>商业研究< / option> 
< / select> 

< select id =select2name =indication_subject []> 
< option value =selected =selected> a< / option> 
< option value =1>会计与LT; /选项&GT; 
< option value =2>南非荷兰语&LT; /选项&GT; 
< option value =3>应用信息与通信技术< / option> 
< option value =4>阿拉伯&LT; /选项&GT; 
< option value =5>艺术与设计< / option> 
< option value =6>生物学和LT; /选项&GT; 
< option value =7>商业研究< / option> 
< / select> 

< select id =select3name =indication_subject []> 
< option value =selected =selected> a< / option> 
< option value =1>会计与LT; /选项&GT; 
< option value =2>南非荷兰语&LT; /选项&GT; 
< option value =3>应用信息与通信技术< / option> 
< option value =4>阿拉伯&LT; /选项&GT; 
< option value =5>艺术与设计< / option> 
< option value =6>生物学和LT; /选项&GT; 
< option value =7>商业研究< / option> 
< / select>

  $（document）.ready（function（）{
 $（select）。change（function（）{
 $（select）。不是（这个）.find（option [value =+ $（this）.val（）+]）attr（'disabled'，true）; 
}）; 
}） ;

演示

I have three dropdowns. I want that when the user selects any item from dropdown 1, then that item should be disabled in dropdown 2 and 3. Also, if an item is selected in dropdown 2, then both selected items must be disabled from dropdown 3.

Here is the code I am using:

<!DOCTYPE html>
<html>
<head>
  <script>
    function updateSelect(changedSelect, selectId) {
      var otherSelect = document.getElementById(selectId);
      for (var i = 0; i < otherSelect.options.length; ++i) {
        otherSelect.options[i].disabled = false;
      }
      if (changedSelect.selectedIndex == 0) {
        return;
      }
      otherSelect.options[changedSelect.selectedIndex].disabled = true;
    }
  </script>
</head>
<body>
  <select id="select_1"  onchange="updateSelect(this,'select_2'),updateSelect(this,'select_3');"   name="indication_subject[]">
    <option value="" selected="selected">a </option>
    <option value="1"> Accounting</option>
    <option value="2"> Afrikaans</option>
    <option value="3"> Applied Information and Communication Technology</option>
    <option value="4"> Arabic</option>
    <option value="5"> Art and Design</option>
    <option value="6"> Biology</option>
    <option value="7"> Business Studies</option>
  </select>
  <select id="select_2" name="indication_subject[]" onchange="updateSelect(this,'select_1','select_3');" >
    <option value="" selected="selected">a </option>
    <option value="1"> Accounting</option>
    <option value="2"> Afrikaans</option>
    <option value="3"> Applied Information and Communication Technology</option>
    <option value="4"> Arabic</option>
    <option value="5"> Art and Design</option>
    <option value="6"> Biology</option>
    <option value="7"> Business Studies</option>
  </select>
  <select id="select_3" name="indication_subject[]" onchange="updateSelect(this,'select_1','select_2');" >
    <option value="" selected="selected">a </option>
   <option value="1"> Accounting</option>
   <option value="2"> Afrikaans</option>
   <option value="3"> Applied Information and Communication Technology</option>
   <option value="4"> Arabic</option>
   <option value="5"> Art and Design</option>
   <option value="6"> Biology</option>
   <option value="7"> Business Studies</option>
  </select>
</body>
</html>

Below is the JSFiddle link which works for two dropdowns, not three. How can I add a third dropdown for this?

http://jsfiddle.net/x4E5Q/1/

Try This:

HTML

<select id="select1" name="indication_subject[]">
  <option value="" selected="selected">a </option>
  <option value="1"> Accounting</option>
  <option value="2"> Afrikaans</option>
  <option value="3"> Applied Information and Communication Technology</option>
  <option value="4"> Arabic</option>
  <option value="5"> Art and Design</option>
  <option value="6"> Biology</option>
  <option value="7"> Business Studies</option>
</select>

<select id="select2" name="indication_subject[]">
  <option value="" selected="selected">a </option>
  <option value="1"> Accounting</option>
  <option value="2"> Afrikaans</option>
  <option value="3"> Applied Information and Communication Technology</option>
  <option value="4"> Arabic</option>
  <option value="5"> Art and Design</option>
  <option value="6"> Biology</option>
  <option value="7"> Business Studies</option>
</select>

<select id="select3" name="indication_subject[]">
  <option value="" selected="selected">a </option>
  <option value="1"> Accounting</option>
  <option value="2"> Afrikaans</option>
  <option value="3"> Applied Information and Communication Technology</option>
  <option value="4"> Arabic</option>
  <option value="5"> Art and Design</option>
  <option value="6"> Biology</option>
  <option value="7"> Business Studies</option>
</select>

$(document).ready(function(){  
  $("select").change(function() {   
    $("select").not(this).find("option[value="+ $(this).val() + "]").attr('disabled', true);
  }); 
});

Demo

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防止在三个不同的下拉列表中选择相同的值

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