Removing an item from a select box

问题

How do I remove items from, or add items to, a select box? I'm running jQuery, should that make the task easier. Below is an example select box.

<select name="selectBox" id="selectBox">
    <option value="option1">option1</option>
    <option value="option2">option2</option>
    <option value="option3">option3</option>
    <option value="option4">option4</option>    
</select>

回答1:

Remove an option:

$("#selectBox option[value='option1']").remove();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="selectBox" id="selectBox">
  <option value="option1">option1</option>
  <option value="option2">option2</option>
  <option value="option3">option3</option>
  <option value="option4">option4</option>	
</select>

Add an option:

$("#selectBox").append('<option value="option5">option5</option>');

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="selectBox" id="selectBox">
  <option value="option1">option1</option>
  <option value="option2">option2</option>
  <option value="option3">option3</option>
  <option value="option4">option4</option>	
</select>

回答2:

You can delete the selected item with this:

$("#selectBox option:selected").remove();

This is useful if you have a list and not a dropdown.

回答3:

window.onload = function ()
{   
    var select = document.getElementById('selectBox');
    var delButton = document.getElementById('delete');

    function remove()
    {
        value = select.selectedIndex;
        select.removeChild(select[value]);
    }

    delButton.onclick = remove;    
}

To add the item I would create second select box and:

var select2 = document.getElementById('selectBox2');
var addSelect = document.getElementById('addSelect');

function add()
{
    value1 = select2.selectedIndex;
    select.appendChild(select2[value1]);    
}

addSelect.onclick = add;

Not jQuery though.

回答4:

To Remove an Item

$("select#mySelect option[value='option1']").remove();

To Add an item

$("#mySelect").append('<option value="option1">Option</option>');

To Check for an option

$('#yourSelect option[value=yourValue]').length > 0;

To remove a selected option

$('#mySelect :selected').remove();

回答5:

This should do it:

$('#selectBox').empty();

回答6:

I find the jQuery select box manipulation plugin useful for this type of thing.

You can easily remove an item by index, value, or regex.

removeOption(index/value/regex/array[, selectedOnly])

Remove an option by
- index: $("#myselect2").removeOption(0);
- value: $("#myselect").removeOption("Value");
- regular expression: $("#myselect").removeOption(/^val/i);
- array $("#myselect").removeOption(["myselect_1", "myselect_2"]);

To remove all options, you can do $("#myselect").removeOption(/./);.

回答7:

Adding/Removing value dynamically without hard-code:

// remove value from select dynamically

$("#id-select option[value='" + dynamicVal + "']").remove();

// Add dynamic value to select

$("#id-select").append('<option value="' + dynamicVal + '">' + dynamicVal + '</option>');

回答8:

I found two pages that seem helpful, it's written for ASP.Net, but the same stuff should apply:

How to add/remove items from a dropdown list using jQuery
jQuery selector expressions

回答9:

The following links will be helpful-

http://api.jquery.com/remove/

http://api.jquery.com/append/

回答10:

Just to augment this for anyone looking, you are also able to just:

$("#selectBox option[value='option1']").hide();

and

$("#selectBox option[value='option1']").show();

回答11:

JavaScript

function removeOptionsByValue(selectBox, value)
{
  for (var i = selectBox.length - 1; i >= 0; --i) {
    if (selectBox[i].value == value) {
      selectBox.remove(i);
    }
  }
}

function addOption(selectBox, text, value, selected)
{
  selectBox.add(new Option(text, value || '', false, selected || false));
}

var selectBox = document.getElementById('selectBox');

removeOptionsByValue(selectBox, 'option3');
addOption(selectBox, 'option5', 'option5', true);

<select name="selectBox" id="selectBox">
    <option value="option1">option1</option>
    <option value="option2">option2</option>
    <option value="option3">option3</option>
    <option value="option4">option4</option>	
</select>

jQuery

jQuery(function($) {
  $.fn.extend({
    remove_options: function(value) {
      return this.each(function() {
        $('> option', this)
          .filter(function() {
            return this.value == value;
          })
          .remove();
      });
    },
    add_option: function(text, value, selected) {
      return this.each(function() {
        $(this).append(new Option(text, value || '', false, selected || false));
      });
    }
  });
});

jQuery(function($) {
  $('#selectBox')
    .remove_options('option3')
    .add_option('option5', 'option5', true);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="selectBox" id="selectBox">
    <option value="option1">option1</option>
    <option value="option2">option2</option>
    <option value="option3">option3</option>
    <option value="option4">option4</option>	
</select>

回答12:

I had to remove the first option from a select, with no ID, only a class, so I used this code successfully:

$('select.validation').find('option:first').remove();

回答13:

I just want to suggest another way to add an option. Instead of setting the value and text as a string one can also do:

var option = $('<option/>')
                  .val('option5')
                  .text('option5');

$('#selectBox').append(option);

This is a less error-prone solution when adding options' values and texts dynamically.

回答14:

If somebody need delete ALL options inside a select, i did a litle function.

I hope you find it useful

var removeAllOptionsSelect = function(element_class_or_id){
    var element = $(element_class_or_id+" option");
    $.each(element,function(i,v){
        value = v.value;
        $(element_class_or_id+" option[value="+value+"]").remove(); 
    })
}

Only have to run

removeAllOptionsSelect("#contenedor_modelos");

回答15:

this is select box html

<select name="selectBox" id="selectBox">
<option value="option1">option1</option>
<option value="option2">option2</option>
<option value="option3">option3</option>
<option value="option4">option4</option>    
</select>

when you want to totally remove and add option from select box then you can use this code

$("#selectBox option[value='option1']").remove();
$("#selectBox").append('<option value="option1">Option</option>');

sometime we need to hide and show option from select box , but not remove then you can use this code

 $("#selectBox option[value='option1']").hide();
 $("#selectBox option[value='option1']").show();

sometime need to remove selected option from select box then

$('#selectBox :selected').remove();
$("#selectBox option:selected").remove();

when you need to remove all option then this code

('#selectBox').empty();

when need to first option or last then this code

$('#selectBox').find('option:first').remove();
$('#selectBox').find('option:last').remove();

来源：https://stackoverflow.com/questions/375508/removing-an-item-from-a-select-box

标签

javascript

jquery

html

html-select