如何删除选择框的所有选项，然后添加一个选项并使用 jQuery 选择它？

Question

Using core jQuery, how do you remove all the options of a select box, then add one option and select it?

My select box is the following.

<Select id="mySelect" size="9"> </Select>

EDIT: The following code was helpful with chaining. However, (in Internet Explorer) .val('whatever') did not select the option that was added. (I did use the same 'value' in both .append and .val .)

$('#mySelect').find('option').remove().end()
.append('<option value="whatever">text</option>').val('whatever');

EDIT: Trying to get it to mimic this code, I use the following code whenever the page/form is reset. This select box is populated by a set of radio buttons. .focus() was closer, but the option did not appear selected like it does with .selected= "true" . Nothing is wrong with my existing code - I am just trying to learn jQuery.

var mySelect = document.getElementById('mySelect');
mySelect.options.length = 0;
mySelect.options[0] = new Option ("Foo (only choice)", "Foo");
mySelect.options[0].selected="true";

EDIT: selected answer was close to what I needed. This worked for me:

$('#mySelect').children().remove().end()
.append('<option selected value="whatever">text</option>') ;

But both answers led me to my final solution..

Answer 1

$('#mySelect')
    .find('option')
    .remove()
    .end()
    .append('<option value="whatever">text</option>')
    .val('whatever')
;

Answer 2

$('#mySelect')
    .empty()
    .append('<option selected="selected" value="whatever">text</option>')
;

Answer 3

为什么不只使用普通的javascript？

document.getElementById("selectID").options.length = 0;

Answer 4

如果您的目标是从选择中删除除第一个选项之外的所有选项（通常是“请选择一个项目”选项），您可以使用：

$('#mySelect').find('option:not(:first)').remove();

Answer 5

I had a bug in IE7 (works fine in IE6) where using the above jQuery methods would clear the select in the DOM but not on screen. Using the IE Developer Toolbar I could confirm that the select had been cleared and had the new items, but visually the select still showed the old items - even though you could not select them.

The fix was to use standard DOM methods/properites (as the poster original had) to clear rather than jQuery - still using jQuery to add options.

$('#mySelect')[0].options.length = 0;

Answer 6

Not sure exactly what you mean by "add one and select it", since it will be selected by default anyway. But, if you were to add more than one, it would make more sense. How about something like:

$('select').children().remove();
$('select').append('<option id="foo">foo</option>');
$('#foo').focus();

Response to "EDIT" : Can you clarify what you mean by "This select box is populated by a set of radio buttons"? A <select> element cannot (legally) contain <input type="radio"> elements.

Answer 7

$('#mySelect')
    .empty()
    .append('<option value="whatever">text</option>')
    .find('option:first')
    .attr("selected","selected")
;

Answer 8

$("#control").html("<option selected=\"selected\">The Option...</option>");

Answer 9

Just one line to remove all options from the select tag and after you can add any options then make second line to add options.

$('.ddlsl').empty();

$('.ddlsl').append(new Option('Select all', 'all'));

One more short way but didn't tried

$('.ddlsl').empty().append(new Option('Select all', 'all'));

Answer 10

Thanks to the answers I received, I was able to create something like the following, which suits my needs. My question was somewhat ambiguous. Thanks for following up. My final problem was solved by including "selected" in the option that I wanted selected.

 $(function() { $('#mySelect').children().remove().end().append('<option selected value="One">One option</option>') ; // clear the select box, then add one option which is selected $("input[name='myRadio']").filter( "[value='1']" ).attr( "checked", "checked" ); // select radio button with value 1 // Bind click event to each radio button. $("input[name='myRadio']").bind("click", function() { switch(this.value) { case "1": $('#mySelect').find('option').remove().end().append('<option selected value="One">One option</option>') ; break ; case "2": $('#mySelect').find('option').remove() ; var items = ["Item1", "Item2", "Item3"] ; // Set locally for demo var options = '' ; for (var i = 0; i < items.length; i++) { if (i==0) { options += '<option selected value="' + items[i] + '">' + items[i] + '</option>'; } else { options += '<option value="' + items[i] + '">' + items[i] + '</option>'; } } $('#mySelect').html(options); // Populate select box with array break ; } // Switch end } // Bind function end ); // bind end }); // Event listener end

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <label>One<input name="myRadio" type="radio" value="1" /></label> <label>Two<input name="myRadio" type="radio" value="2" /></label> <select id="mySelect" size="9"></select>

Answer 11

I've found on the net something like below. With a thousands of options like in my situation this is a lot faster than .empty() or .find().remove() from jQuery.

var ClearOptionsFast = function(id) {
    var selectObj = document.getElementById(id);
    var selectParentNode = selectObj.parentNode;
    var newSelectObj = selectObj.cloneNode(false); // Make a shallow copy
    selectParentNode.replaceChild(newSelectObj, selectObj);
    return newSelectObj;
}

More info here .

Answer 12

How about just changing the html to new data.

$('#mySelect').html('<option value="whatever">text</option>');

Another example:

$('#mySelect').html('
    <option value="1" selected>text1</option>
    <option value="2">text2</option>
    <option value="3" disabled>text3</option>
');

Answer 13

1. First clear all exisiting option execpt the first one(--Select--)

2. Append new option values using loop one by one

   $('#ddlCustomer').find('option:not(:first)').remove(); for (var i = 0; i < oResult.length; i++) { $("#ddlCustomer").append(new Option(oResult[i].CustomerName, oResult[i].CustomerID + '/' + oResult[i].ID)); }

Answer 14

Another way:

$('#select').empty().append($('<option>').text('---------').attr('value',''));

Under this link, there are good practices https://api.jquery.com/select/

Answer 15

$("#id option").remove();
$("#id").append('<option value="testValue" >TestText</option>');

The first line of code will remove all the options of a select box as no option find criteria has been mentioned.

The second line of code will add the Option with the specified value("testValue") and Text("TestText").

Answer 16

Building on mauretto's answer, this is a little easier to read and understand:

$('#mySelect').find('option').not(':first').remove();

To remove all the options except one with a specific value, you can use this:

$('#mySelect').find('option').not('[value=123]').remove();

This would be better if the option to be added was already there.

Answer 17

This will replace your existing mySelect with a new mySelect.

$('#mySelect').replaceWith('<Select id="mySelect" size="9">
   <option value="whatever" selected="selected" >text</option>
   </Select>');

Answer 18

使用 jquery prop()清除选中的选项

$('#mySelect option:selected').prop('selected', false);

Answer 19

You can do simply by replacing html

$('#mySelect')
.html('<option value="whatever" selected>text</option>')
.trigger('change');

Answer 20

Cleaner give me Like it

   let data= []

   let inp = $('#mySelect')
        inp.empty()

        data.forEach(el=> inp.append(  new Option(el.Nombre, el.Id) ))

Answer 21

• save the option values to be appended in an object
• clear existing options in the select tag
• iterate the list object and append the contents to the intended select tag

 var listToAppend = {'':'Select Vehicle','mc': 'Motor Cyle', 'tr': 'Tricycle'}; $('#selectID').empty(); $.each(listToAppend, function(val, text) { $('#selectID').append( new Option(text,val) ); });

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Answer 22

I saw this code in Select2 - Clearing Selections

$('#mySelect').val(null).trigger('change');

This code works well with jQuery even without Select2

Answer 23

I used vanilla javascript

let select = document.getElementById("mySelect");
select.innerHTML = "";

Answer 24

Hope it will work

$('#myselect').find('option').remove()
.append($('<option></option>').val('value1').html('option1'));

Answer 25

var select = $('#mySelect');
select.find('option').remove().end()
.append($('<option/>').val('').text('Select'));
var data = [{"id":1,"title":"Option one"}, {"id":2,"title":"Option two"}];
for(var i in data) {
    var d = data[i];
    var option = $('<option/>').val(d.id).text(d.title);
    select.append(option);
}
select.val('');

Answer 26

Try

mySelect.innerHTML = `<option selected value="whatever">text</option>`

 function setOne() { console.log({mySelect}); mySelect.innerHTML = `<option selected value="whatever">text</option>`; }

 <button onclick="setOne()" >set one</button> <Select id="mySelect" size="9"> <option value="1">old1</option> <option value="2">old2</option> <option value="3">old3</option> </Select>

Answer 27

最短的答案：

$('#mySelect option').remove().append('<option selected value="whatever">text</option>');

Answer 28

Try

$('#mySelect')
.html('<option value="whatever">text</option>')
.find('option:first')
.attr("selected","selected");

OR

$('#mySelect').html('<option value="4">Value 4</option>
 <option value="5">Value 5</option>
<option value="6">Value 6</option>
<option value="7">Value 7</option>
<option value="8">Value 8</option>')
.find('option:first')
.prop("selected",true);