选择后如何禁用下拉菜单项？

Question

Category is the first item yo will see i want it to be removed or disabled after is is selected so that it doesn't show when viewing the other drop down menu items.

<select NAME="category" style="width:130px; background-color:#FFF; font-weight:bold; font-size:12px;" ONCHANGE="setup(document.search1.category.value)"> 
  <option value="category" selected="selected">Category</option> 
  <option value="cleaning">Cleaning</option> 
  <option value="cooling">Cooling</option>
  <option value="heating">Heating</option> 
  <option value="kitchen">Kicthen</option> 
  <option value="lighting">Lighting</option> 
  <option value="washroom">Washroom</option> 
</select>

Answer 1

This will remove the slected Item

<select NAME="category" style="width:130px; background-color:#FFF; font-weight:bold; font-size:12px;" onchange="this.remove(this.selectedIndex);"> 
  <option value="category" selected="selected">Category</option> 
  <option value="cleaning">Cleaning</option> 
  <option value="cooling">Cooling</option>
  <option value="heating">Heating</option> 
  <option value="kitchen">Kicthen</option> 
  <option value="lighting">Lighting</option> 
  <option value="washroom">Washroom</option> 
</select>​

Answer 2

You should use it like this disabled = 'disabled'

<select NAME="category" style="width:130px; background-color:#FFF; font-weight:bold; font-size:12px;" onchange="javascript:this.disabled = 'disabled';"> 
  <option value="category" selected="selected">Category</option> 
  <option value="cleaning">Cleaning</option> 
  <option value="cooling">Cooling</option>
  <option value="heating">Heating</option> 
  <option value="kitchen">Kicthen</option> 
  <option value="lighting">Lighting</option> 
  <option value="washroom">Washroom</option> 
</select>​

Answer 3

If you want to remove the "category" line item after a user selects a different item from your drop down, you would do this:

<script type="text/javascript">
    $(document).ready(function () {

    $('#selectList').change(function () {
        if (this[0].value == "category")
        {
            this.remove(this[0]);
        }
    });

});
</script>

<select id='selectList' name="category" 
style="width:130px; background-color:#FFF; font-weight:bold; font-size:12px;"> 
    <option value="category">Category</option> 
    <option value="cleaning">Cleaning</option> 
    <option value="cooling">Cooling</option>
    <option value="heating">Heating</option> 
    <option value="kitchen">Kicthen</option> 
    <option value="lighting">Lighting</option> 
    <option value="washroom">Washroom</option> 
</select>

That will remove the Category row from the drop down and ONLY the category row.