jQuery将小数添加到SELECT，没有重复选项删除

Posted 2023-03-13

【中文标题】jQuery将小数添加到SELECT，没有重复选项删除

【英文标题】：jQuery add decimal to SELECT, No Duplicates with option to remove

【发布时间】：2010-10-27 02:29:13

【问题描述】：

到这里就OK了：需要过滤掉重复项并能够删除添加到 SELECT 框中的值。

Number: <input type="text" name="number" />
<br />
<!-- Clicking the button should add an option w/ the value being the text displayed -->
<button type="button">Add</button>
<br />
<Select id="mySelect" size="9"></Select>
<br />
<!-- Display only if SELECT box has a value -->
<button type="button" hidden="hidden">Remove</button>

我查看了this thread，但仍然缺少一些东西。

【问题讨论】：

这里的问题我没看懂？

【参考方案1】：

我不太确定你在问什么，所以澄清一下会很有帮助。这是我对您正在寻找的东西的破解：

Javascript

<script type="text/javascript" charset="utf-8">
 $( function()        
   // Add number from <input> as an <option> to the <select>
   $('#add_number').click( function() 
     // Get Number from <input>
     var numberToAdd = $('#number_to_add').val();

     // Make sure it's not a duplicate; if so, don't add
     var match = false;
     $('#mySelect option').each( function() 
       if (numberToAdd == this.value) match = true;
     );
     if (match) return false;

     // Add the number to the <select>
     $('#mySelect').append(
       $('<option></option>').html(numberToAdd).val(numberToAdd)
     );

     // Show the remove button
     $('#remove_selected').show();
     return false;
   );

   // Remove the currently selected <option> in the <select>
   $('#remove_selected').click( function() 
     $('#mySelect option:selected').remove();
     return false;
   );
 )
</script>   

HTML

<form action="#">
  <p>
    Number: <input type="text" name="number_to_add" id="number_to_add" />
    <button id="add_number" type="button">Add</button>
  </p>
  <p>
    <select id="mySelect" size="9"></select>
    <button id="remove_selected" type="button" style="display:none;">Remove</button>
  </p>
</form>