How do I check whether a checkbox is checked in jQuery?

Created 23.05.2009 15:16
Viewed 4.36M times
4824 votes

I need to check the checked property of a checkbox and perform an action based on the checked property using jQuery.

For example, if the age checkbox is checked, then I need to show a textbox to enter age, else hide the textbox.

But the following code returns false by default:

if ($('#isAgeSelected').attr('checked')) {
  $("#txtAge").show();
} else {
  $("#txtAge").hide();
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" id="isAgeSelected"/>
<div id="txtAge" style="display:none">
  Age is selected
</div>

How do I successfully query the checked property?

8
Comments
Check some other ways to do this using jQuery here stackoverflow.com/a/22019103/1868660 by Subodh Ghulaxe, 25.02.2014 15:45
related stackoverflow.com/questions/4086957/… by Adrien Be, 21.05.2014 15:18
It's important to note everyone, that there is a colon between the opening single quote and the word "checked." It represents a pseudoclass selector of the checkbox. I just made the mistake of not copying and pasting the code and missed the colon. Frustrating. by OKGimmeMoney, 15.08.2014 15:16
For properties, use .prop(). .attr() is for attributes. by Joseph Lennox, 12.06.2015 02:16
why not $('#isAgeSelected').checked by Don Cheadle, 27.10.2015 14:52
Starting jquery 1.6 there have been significant changes the way attributes and properties are dealt with. For your case following should work: if($('#isAgeSelected').prop("checked")) { $("#txtAge").show(); } else { $("#txtAge").hide(); } The condition in if statement will simply return true or false depending upon the checked/unchecked state of the check box. For more details refer to attributes vs. properties section on this link. by RBT, 12.02.2016 18:44
For a comprehensive ( and correct ) answer see: stackoverflow.com/questions/426258/… by Paul Kenjora, 19.04.2016 14:11
Since jQuery selectors return array, you can use $('#isAgeSelected')[0].checked by Felipe Leão, 20.06.2016 19:36
Show remaining 3 comments
Answers 50
1
3552

How do I successfully query the checked property?

The checked property of a checkbox DOM element will give you the checked state of the element.

Given your existing code, you could therefore do this:

if(document.getElementById('isAgeSelected').checked) {
    $("#txtAge").show();
} else {
    $("#txtAge").hide();
}

However, there's a much prettier way to do this, using toggle:

$('#isAgeSelected').click(function() {
    $("#txtAge").toggle(this.checked);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" id="isAgeSelected"/>
<div id="txtAge" style="display:none">Age is something</div>

23.05.2009 15:20
Comments
This is not an answer to the question. this.checked is not jQuery, as the OP asked for. Also, it only works when user clicks on the checkbox, which is not part of the question. The question is, again, How to check whether a checkbox is checked in jQuery? at any given time with or without clicking the checkbox and in jQuery. by Marc Compte, 06.07.2017 10:58
1
1995

Use jQuery's is() function:

if($("#isAgeSelected").is(':checked'))
    $("#txtAge").show();  // checked
else
    $("#txtAge").hide();  // unchecked
22.06.2011 10:14
Comments
A little bit cleaner solution would be $("#txtAge").toggle($("#isAgeSelected").is(':checked')). by Kai Neuwerth, 06.01.2021 09:02
0
605

Using jQuery > 1.6

<input type="checkbox" value="1" name="checkMeOut" id="checkMeOut" checked="checked" />

// traditional attr
$('#checkMeOut').attr('checked'); // "checked"
// new property method
$('#checkMeOut').prop('checked'); // true

Using the new property method:

if($('#checkMeOut').prop('checked')) {
    // something when checked
} else {
    // something else when not
}
23.06.2011 17:29
1
252

jQuery 1.6+

$('#isAgeSelected').prop('checked')

jQuery 1.5 and below

$('#isAgeSelected').attr('checked')

Any version of jQuery

// Assuming an event handler on a checkbox
if (this.checked)

All credit goes to Xian.

20.05.2014 20:03
Comments
Technically, this.checked is using straight Javascript. But I love that cross-jQuery-version answer! by vapcguy, 19.06.2015 16:50
0
182

I am using this and this is working absolutely fine:

$("#checkkBoxId").attr("checked") ? alert("Checked") : alert("Unchecked");

Note: If the checkbox is checked it will return true otherwise undefined, so better check for the "TRUE" value.

19.08.2010 13:38
0
169

Use:

<input type="checkbox" name="planned_checked" checked id="planned_checked"> Planned

$("#planned_checked").change(function() {
    if($(this).prop('checked')) {
        alert("Checked Box Selected");
    } else {
        alert("Checked Box deselect");
    }
});

    $("#planned_checked").change(function() {
        if($(this).prop('checked')) {
            alert("Checked Box Selected");
        } else {
            alert("Checked Box deselect");
        }
    });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input type="checkbox" name="planned_checked" checked id="planned_checked"> Planned

29.08.2016 11:38
0
112

This worked for me:

$get("isAgeSelected ").checked == true

Where isAgeSelected is the id of the control.

Also, @karim79's answer works fine. I am not sure what I missed at the time I tested it.

Note, this is answer uses Microsoft Ajax, not jQuery

24.05.2009 05:30
0
130

Since jQuery 1.6, the behavior of jQuery.attr() has changed and users are encouraged not to use it to retrieve an element's checked state. Instead, you should use jQuery.prop():

$("#txtAge").toggle(
    $("#isAgeSelected").prop("checked") // For checked attribute it returns true/false;
                                        // Return value changes with checkbox state
);

Two other possibilities are:

$("#txtAge").get(0).checked
$("#txtAge").is(":checked")
27.04.2012 11:54
0
98

If you are using an updated version of jquery, you must go for .prop method to resolve your issue:

$('#isAgeSelected').prop('checked') will return true if checked and false if unchecked. I confirmed it and I came across this issue earlier. $('#isAgeSelected').attr('checked') and $('#isAgeSelected').is('checked') is returning undefined which is not a worthy answer for the situation. So do as given below.

if($('#isAgeSelected').prop('checked')) {
    $("#txtAge").show();
} else {
    $("#txtAge").hide();
}

Hope it helps :)- Thanks.

25.08.2013 03:11
0
73

Use:

<input type="checkbox" id="abc" value="UDB">UDB
<input type="checkbox" id="abc" value="Prasad">Prasad
$('input#abc').click(function(){
  if($(this).is(':checked'))
  {
    var checkedOne=$(this).val()
    alert(checkedOne);

    // Do some other action
  }
})

This can help if you want that the required action has to be done only when you check the box not at the time you remove the check.

29.09.2013 15:45
0
70

Using the Click event handler for the checkbox property is unreliable, as the checked property can change during the execution of the event handler itself!

Ideally, you'd want to put your code into a change event handler such as it is fired every time the value of the check box is changed (independent of how it's done so).

$('#isAgeSelected').bind('change', function () {

   if ($(this).is(':checked'))
     $("#txtAge").show();
   else
     $("#txtAge").hide();
});
06.10.2011 01:12
0
60

I believe you could do this:

if ($('#isAgeSelected :checked').size() > 0)
{
    $("#txtAge").show(); 
} else { 
    $("#txtAge").hide();
}
23.05.2009 15:34
0
61

I decided to post an answer on how to do that exact same thing without jQuery. Just because I'm a rebel.

var ageCheckbox = document.getElementById('isAgeSelected');
var ageInput = document.getElementById('txtAge');

// Just because of IE <333
ageCheckbox.onchange = function() {
    // Check if the checkbox is checked, and show/hide the text field.
    ageInput.hidden = this.checked ? false : true;
};

First you get both elements by their ID. Then you assign the checkboxe's onchange event a function that checks whether the checkbox got checked and sets the hidden property of the age text field appropriately. In that example using the ternary operator.

Here is a fiddle for you to test it.

Addendum

If cross-browser compatibility is an issue then I propose to set the CSS display property to none and inline.

elem.style.display = this.checked ? 'inline' : 'none';

Slower but cross-browser compatible.

20.03.2012 19:19
0
58

I ran in to the exact same issue. I have an ASP.NET checkbox

<asp:CheckBox ID="chkBox1" CssClass='cssChkBox1' runat="server" />

In the jQuery code I used the following selector to check if the checkbox was checked or not, and it seems to work like a charm.

if ($("'.cssChkBox1 input[type=checkbox]'").is(':checked'))
{ ... } else { ... }

I'm sure you can also use the ID instead of the CssClass,

if ($("'#cssChkBox1 input[type=checkbox]'").is(':checked'))
{ ... } else { ... }

I hope this helps you.

16.12.2010 18:50
0
56

This code will help you

$('#isAgeSelected').click(function(){
   console.log(this.checked);
   if(this.checked == true) {
        $("#txtAge").show();
    } else {
       $("#txtAge").hide();
   }
});
13.10.2016 06:03
0
53

There are many ways to check if a checkbox is checked or not:

Way to check using jQuery

if (elem.checked)
if ($(elem).prop("checked"))
if ($(elem).is(":checked"))
if ($(elem).attr('checked'))

Check example or also document:

14.10.2014 07:48
0
52

This works for me:

/* isAgeSelected being id for checkbox */

$("#isAgeSelected").click(function(){
  $(this).is(':checked') ? $("#txtAge").show() : $("#txtAge").hide();
});
06.01.2011 11:33
0
50

You can try the change event of checkbox to track the :checked state change.

$("#isAgeSelected").on('change', function() {
  if ($("#isAgeSelected").is(':checked'))
    alert("checked");
  else {
    alert("unchecked");
  }
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" id="isAgeSelected" />
<div id="txtAge" style="display:none">
  Age is selected
</div>

03.10.2019 08:20
0
48

This is some different method to do the same thing:

$(document).ready(function (){

    $('#isAgeSelected').click(function() {
        // $("#txtAge").toggle(this.checked);

        // Using a pure CSS selector
        if ($(this.checked)) {
            alert('on check 1');
        };

        // Using jQuery's is() method
        if ($(this).is(':checked')) {
            alert('on checked 2');
        };

        //  // Using jQuery's filter() method
        if ($(this).filter(':checked')) {
            alert('on checked 3');
        };
    });
});
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<input type="checkbox" id="isAgeSelected"/>
<div id="txtAge" style="display:none">Age is something</div>

24.08.2015 12:19
0
42

Use this:

if ($('input[name="salary_in.Basic"]:checked').length > 0)

The length is greater than zero if the checkbox is checked.

27.07.2016 09:46
0
39

My way of doing this is:

if ( $("#checkbox:checked").length ) {       
    alert("checkbox is checked");
} else {
    alert("checkbox is not checked");
}
06.02.2012 14:31
0
36
$(selector).attr('checked') !== undefined

This returns true if the input is checked and false if it is not.

12.02.2012 15:15
0
34

You can use:

  if(document.getElementById('isAgeSelected').checked)
    $("#txtAge").show();  
  else
    $("#txtAge").hide();

if($("#isAgeSelected").is(':checked'))
  $("#txtAge").show();  
else
  $("#txtAge").hide();

Both of them should work.

28.04.2016 12:07
0
34
$(document).ready(function() {    
    $('#agecheckbox').click(function() {
        if($(this).is(":checked"))
        {
            $('#agetextbox').show();
        } else {
            $('#agetextbox').hide();
        }
    });
});
25.11.2014 12:25
1
32

1) If your HTML markup is:

<input type="checkbox"  />

attr used:

$(element).attr("checked"); // Will give you undefined as initial value of checkbox is not set

If prop is used:

$(element).prop("checked"); // Will give you false whether or not initial value is set

2) If your HTML markup is:

 <input type="checkbox"  checked="checked" />// May be like this also  checked="true"

attr used:

$(element).attr("checked") // Will return checked whether it is checked="true"

Prop used:

$(element).prop("checked") // Will return true whether checked="checked"
30.10.2013 12:43
Comments
This is a REAL problem. My workaround - add a change event to the input: <input type="checkbox" onchange="ChangeChkBox()" /> then use that event to change a boolean JavaScript variable, and use the JavaScript variable instead of querying the checkbox directly. by Graham Laight, 10.05.2016 11:33
0
28

This example is for button.

Try the following:

<input type="button" class="check" id="checkall" value="Check All" />  &nbsp; <input type="button" id="remove" value="Delete" /> <br/>

<input type="checkbox" class="cb-element"  value="1" /> Checkbox  1 <br/>
<input type="checkbox" class="cb-element"  value="2" /> Checkbox  2 <br/>
<input type="checkbox" class="cb-element"  value="3" /> Checkbox  3 <br/>


$('#remove').attr('disabled', 'disabled'); 

$(document).ready(function() {  

    $('.cb-element').click(function() {

        if($(this).prop('checked'))
        {
            $('#remove').attr('disabled', false);
        }
        else
        {
            $('#remove').attr('disabled', true);
        }
    });   

    $('.check:button').click(function()
{
    var checked = !$(this).data('checked');
    $('input:checkbox').prop('checked', checked);
    $(this).data('checked', checked);

    if(checked == true)
    {
        $(this).val('Uncheck All');
         $('#remove').attr('disabled', false);
    }

    else if(checked == false)
    {
        $(this).val('Check All');
        $('#remove').attr('disabled', true);
    }
});
});
03.01.2014 10:38
0
28

The top answer didn't do it for me. This did though:

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

        $("#li_13").click(function(){
            if($("#agree").attr('checked')){
                $("#saveForm").fadeIn();
            }
            else
            {
                $("#saveForm").fadeOut();
            }
        });
    });
</script>

Basically when the element #li_13 is clicked, it checks if the element # agree (which is the checkbox) is checked by using the .attr('checked') function. If it is then fadeIn the #saveForm element, and if not fadeOut the saveForm element.

10.12.2012 05:02
0
27

Though you have proposed a JavaScript solution for your problem (displaying a textbox when a checkbox is checked), this problem could be solved just by css. With this approach, your form works for users who have disabled JavaScript.

Assuming that you have the following HTML:

<label for="show_textbox">Show Textbox</label>
<input id="show_textbox" type="checkbox" />
<input type="text" />

You can use the following CSS to achieve the desired functionality:

 #show_textbox:not(:checked) + input[type=text] {display:none;}

For other scenarios, you may think of appropriate CSS selectors.

Here is a Fiddle to demonstrate this approach.

22.08.2015 19:09
0
26

I am using this:

 <input type="checkbox" id="isAgeSelected" value="1" /> <br/>
 <input type="textbox" id="txtAge" />

 $("#isAgeSelected").is(':checked') ? $("#txtAge").show() : $("#txtAge").hide();
06.09.2013 06:43
0
24

Toggle: 0/1 or else

<input type="checkbox" id="nolunch" />
<input id="checklunch />"

    $('#nolunch').change(function () {
    if ($(this).is(':checked')) {
        $('#checklunch').val('1');
    };
    if ($(this).is(':checked') == false) {
        $('#checklunch').val('0');
    };
});
08.01.2015 13:10
0
23

I think it will be the simple one

$('#isAgeSelected').change(function() {
    if($(this).is(":checked")) {
        $('#txtAge').show();
    }
else{
        $('#txtAge').hide();
    }                                          
});
04.06.2015 05:07
0
22

To act on a checkbox being checked or unchecked on click.

$('#customCheck1').click(function() {
  if (this.checked) {
    console.log('checked');
  } else {
    console.log('un-checked');
  }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<input type="checkbox" id="customCheck1">

EDIT: Not a nice programming expression if (boolean == true) though .checked property might return other type variables as well..

It is better to use .prop("checked") instead. It returns true and false only.

03.10.2019 09:50
0
20

I'm sure it's not some revelation, but I didn't see it all in one example:

Selector for all checked checkboxes(on the page):

$('input[type=checkbox]:checked')
15.11.2013 10:50
0
20

Please try below code to check checkbox is checked or not

$(document).ready(function(){

    $("#isAgeSelected").on('change',function(){

    if($("#isAgeSelected").is(':checked'))
        $("#txtAge").show();  // checked
    else{
        $("#txtAge").hide();  // unchecked
    }

   });

});
29.05.2019 04:46
0
18

I verified in Firefox 9.0.1 that the following works for catching the state of a checkbox post change:

$("#mycheckbox").change(function() {
    var value = $(this).prop("checked") ? 'true' : 'false';                     
    alert(value);
});
07.02.2012 18:43
0
17

Include jQuery from the local file system. I used Google's CDN, and there are also many CDNs to choose from.

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

The code will execute as soon as a checkbox inside mycheck class is clicked. If the current clicked checkbox is checked then it will disable all others and enable the current one. If the current one is unchecked, it will again enable all checkboxes for rechecking.

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

        var checkbox_selector = '.mycheck input[type=checkbox]';

        $(checkbox_selector).click(function() {
            if ($($(this)).is(':checked')) {

                // Disable all checkboxes
                $(checkbox_selector).attr('disabled', 'disabled');

                // Enable current one
                $($(this)).removeAttr('disabled');
            }
            else {
                // If unchecked open all checkbox
                $(checkbox_selector).removeAttr('disabled');
            }
        });
    });
</script>

Simple form to test

<form method="post" action="">
    <div class="mycheck">
        <input type="checkbox" value="1" /> Television
        <input type="checkbox" value="2" /> Computer
        <input type="checkbox" value="3" /> Laptop
        <input type="checkbox" value="4" /> Camera
        <input type="checkbox" value="5" /> Music Systems
    </div>
</form>

Output screen:

Enter image description here

02.03.2013 05:38
0
17
if($("#checkkBoxId").is(':checked')){
  alert("Checked=true");
}

or

if($("#checkkBoxId").attr('checked') == true){
  alert("checked=true");
}
10.06.2013 13:12
0
15

The checked attribute of an input type="checkbox" is mapped with the defaultChecked property, not with the checked property.

So when doing something in a page when a checkbox is checked on uncheked, use the prop() method instead. It fetches the property value and changes as the state of the checkbox changes.

Using attr() or getAttribute(in pure JavaScript) in these cases are not the proper way of doing things.

if elem is the concerned checkbox then do something like this to fetch the value:

elem.checked

or

$(elem).prop('checked')
10.10.2013 06:23
0
15

Automated

$(document).ready(function()
{
    $('#isAgeSelected').change(function()
    {
        alert( 'value =' + $('#chkSelect').attr('checked') );
    });
});

HTML

<b> <input type="isAgeSelected" id="chkSelect" /> Age Check </b>

<br/><br/>

<input type="button" id="btnCheck" value="check" />

jQuery

$(document).ready(function()
{
    $('#btnCheck').click(function()
    {
        var isChecked = $('#isAgeSelected').attr('checked');

        if (isChecked == 'checked')
            alert('check-box is checked');
        else
            alert('check-box is not checked');
    })
});

Ajax

function check()
{
    if (isAgeSelected())
        alert('check-box is checked');
    else
        alert('check-box is not checked');
}

function isAgeSelected()
{
    return ($get("isAgeSelected").checked == true);
}
14.05.2014 05:42
0
14

$(document).on("click","#isAgeSelected",function(){
  if($(this).prop("checked") == true){
    $("#txtAge").show();
  }
  else if($(this).prop("checked") == false){
    $("#txtAge").hide();
  }
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

 <input type="checkbox" id="isAgeSelected"/>

<div id="txtAge" style="display:none">
<input type="text" name="age" placeholder="Please enter age" />
</div>

03.02.2020 06:20
0
13

Using pure JavaScript:

let checkbox = document.getElementById('checkboxID');

if(checkbox.checked) {
  alert('is checked');
} else {
  alert('not checked yet');
}
11.09.2018 00:51
0
12

I was having the same problem and none of the posted solutions seemed to work and then I found out that it's because ASP.NET renders the CheckBox control as a SPAN with INPUT inside, so the CheckBox ID is actually an ID of a SPAN, not an INPUT, so you should use:

$('#isAgeSelected input')

rather than

$('#isAgeSelected')

and then all methods listed above should work.

09.12.2010 14:44
0
14

This is the minimal amount of code I think I needed to do something like this effectively. I found this method to be useful; it returns an array of the check boxes that are checked and then you can use their value (this solution uses jQuery):

// This is how you get them
var output = "";
var checkedBoxes = $("DivCheckBoxesAreIn").children("input:checked");
if(checkedBoxes.length <= 0) {
    alert('Please select check boxes');
    return false;
};

// And this is how you use them:
checkedBoxes.each(function() {
    output +=  this.value + ", ";
};

Printing "output" will give you a comma-separated list of your values.

15.07.2013 15:50
0
13

Simply use it like below

 $('#isAgeSelected').change(function() {
     if ($(this).is(":checked")) { // or if($("#isAgeSelected").attr('checked') == true){
         $('#txtAge').show();
     } else {
         $('#txtAge').hide();
     }
 });
14.07.2018 07:47
0
12

Here's an example that includes initialising the show/hide to match the state of the checkbox when the page loads; taking account of the fact that firefox remembers the state of checkboxes when you refresh the page, but won't remember the state of the shown/hidden elements.

$(function() {
    // initialise visibility when page is loaded
    $('tr.invoiceItemRow').toggle($('#showInvoiceItems').attr('checked'));
    // attach click handler to checkbox
    $('#showInvoiceItems').click(function(){ $('tr.invoiceItemRow').toggle(this.checked);})
});

(with help from other answers on this question)

10.05.2011 21:36
0
9

Use:

$(this).toggle($("input:checkbox", $(this))[0].checked);

When you are selecting out of context, remember you need the [0] to access the checkbox.

23.01.2013 16:40
0
10

This was my workaround:

$('#vcGoButton').click(function () {
    var buttonStatus = $('#vcChangeLocation').prop('checked');
    console.log("Status is " + buttonStatus);
    if (buttonStatus) {
        var address = $('#vcNewLocation').val();
        var cabNumber = $('#vcVehicleNumber').val();
        $.get('postCabLocation.php',
              {address: address, cabNumber: cabNumber},
              function(data) {
                  console.log("Changed vehicle " + cabNumber + " location to " + address );
              });
    }
    else {
        console.log("VC go button clicked, but no location action");
    }
});
25.02.2013 02:26
0
8

A selector returns multiple objects, and it must take the first item in the array:

// Collection
var chckremember = $("#chckremember");


// Result boolen
var ischecked=chckremember[0].checked;
29.03.2015 21:45
0
9

Setter:

$("#chkmyElement")[0].checked = true;

Getter:

if($("#chkmyElement")[0].checked) {
   alert("enabled");
} else {
   alert("disabled");
}
22.04.2014 02:31
0
8

I would actually prefere the change event.

$('#isAgeSelected').change(function() {
    $("#txtAge").toggle(this.checked);
});

Demo Fiddle

30.08.2014 10:36