Check if checkbox is checked with jQuery

user_229853 0
Viewed 2456703

How can I check if a checkbox in a checkbox array is checked using the id of the checkbox array?

I am using the following code, but it always returns the count of checked checkboxes regardless of id.

function isCheckedById(id) {
    alert(id);
    var checked = $("input[@id=" + id + "]:checked").length;
    alert(checked);

    if (checked == 0) {
        return false;
    } else {
        return true;
    }
}
checkbox html jquery javascript
25 Answers
$('#' + id).is(":checked")

That gets if the checkbox is checked.

For an array of checkboxes with the same name you can get the list of checked ones by:

var $boxes = $('input[name=thename]:checked');

Then to loop through them and see what's checked you can do:

$boxes.each(function(){
    // Do stuff here with this
});

To find how many are checked you can do:

$boxes.length;
user_28470

IDs must be unique in your document, meaning that you shouldn't do this:

<input type="checkbox" name="chk[]" id="chk[]" value="Apples" />
<input type="checkbox" name="chk[]" id="chk[]" value="Bananas" />

Instead, drop the ID, and then select them by name, or by a containing element:

<fieldset id="checkArray">
    <input type="checkbox" name="chk[]" value="Apples" />

    <input type="checkbox" name="chk[]" value="Bananas" />
</fieldset>

And now the jQuery:

var atLeastOneIsChecked = $('#checkArray:checkbox:checked').length > 0;
//there should be no space between identifier and selector

// or, without the container:

var atLeastOneIsChecked = $('input[name="chk[]"]:checked').length > 0;
nickf_90210

jQuery code to check whether the checkbox is checked or not:

if($('input[name="checkBoxName"]').is(':checked'))
{
  // checked
}else
{
 // unchecked
}

Alternatively:

if($('input[name="checkBoxName"]:checked'))
{
    // checked
}else{
  // unchecked
}
user_66629440

This is also an idea I use frequently:

var active = $('#modal-check-visible').prop("checked") ? 1 : 0 ;

If cheked, it'll return 1; otherwise it'll return 0.

user_92917310

I know the OP want jquery but in my case pure JS was the answer so if anyone like me is here and do not have jquery or do not want to use it - here is the JS answer:

document.getElementById("myCheck").checked

It returns true if the input with ID myCheck is checked and false if it is not checked.

Simple as that.

user_29799380 
$(document).on('click','#checkBoxId',function(){
  var isChecked = $(this).is(':checked');
  console.log(isChecked);
});

This code above works also on bootstrap modal. isChecked is true or flase ;

user_29950610

Simple Demo for checking and setting a check box.

jsfiddle!

$('.attr-value-name').click(function() {
    if($(this).parent().find('input[type="checkbox"]').is(':checked'))
    {
        $(this).parent().find('input[type="checkbox"]').prop('checked', false);
    }
    else
    {
        $(this).parent().find('input[type="checkbox"]').prop('checked', true);
    }
});
user_12372080

Try this...

$(function(){
  $('body').on('click','.checkbox',function(e){
    
    if($(this).is(':checked')){
      console.log('Checked')
    } else {
      console.log('Unchecked')
    }
  })
})
user_12835170

Using this code you can check at least one checkbox is selected or not in different checkbox groups or from multiple checkboxes. Using this you can not require to remove IDs or dynamic IDs. This code work with the same IDs.

Reference Link

<label class="control-label col-sm-4">Check Box 2</label>
    <input type="checkbox" name="checkbox2" id="checkbox21" value=ck1 /> ck1<br />
    <input type="checkbox" name="checkbox2" id="checkbox22" value=ck2 /> ck2<br />

<label class="control-label col-sm-4">Check Box 3</label>
    <input type="checkbox" name="checkbox3" id="checkbox31" value=ck3 /> ck3<br />
    <input type="checkbox" name="checkbox3" id="checkbox32" value=ck4 /> ck4<br />

<script>
function checkFormData() {
    if (!$('input[name=checkbox2]:checked').length > 0) {
        document.getElementById("errMessage").innerHTML = "Check Box 2 can not be null";
        return false;
    }
    if (!$('input[name=checkbox3]:checked').length > 0) {
        document.getElementById("errMessage").innerHTML = "Check Box 3 can not be null";
        return false;
    }
    alert("Success");
    return true;
}
</script>
user_65901560

Since it's mid 2019 and jQuery sometimes takes a backseat to things like VueJS, React etc. Here's a pure vanilla Javascript onload listener option:

<script>
  // Replace 'admincheckbox' both variable and ID with whatever suits.

  window.onload = function() {
    const admincheckbox = document.getElementById("admincheckbox");
    admincheckbox.addEventListener('click', function() {
      if(admincheckbox.checked){
        alert('Checked');
      } else {
        alert('Unchecked');
      }
    });
  }
</script>
user_45821320

Your question is not clear: you want to give "checkbox array id" at input and get true/false at output - in this way you will not know which checkbox was checked (as your function name suggest). So below there is my proposition of body of your isCheckedById which on input take checkbox id and on output return true/false (it's very simple but your ID should not be keyword),

this[id].checked


function isCheckedById(id) {
  return this[id].checked;
}



// TEST

function check() {
  console.clear()
  console.log('1',isCheckedById("myCheckbox1"));
  console.log('2',isCheckedById("myCheckbox2"));
  console.log('3',isCheckedById("myCheckbox3"));
}
<label><input id="myCheckbox1" type="checkbox">check 1</label>
<label><input id="myCheckbox2" type="checkbox">check 2</label>
<label><input id="myCheckbox3" type="checkbox">check 3</label>
<!-- label around inputs makes text clickable -->
<br>
<button onclick="check()">show checked</button>

user_8600990
Related