How can I check if a checkbox is checked?

Question

I am building a mobile web app with jQuery Mobile and I want to check if a checkbox is checked. Here is my code.

<script type=text/javascript>
  function validate(){
    if (remember.checked == 1){
      alert("checked") ;
    } else {
      alert("You didn't check it! Let me check it for you.")
    }
  }
</script>

<input id="remember" name="remember" type="checkbox" onclick="validate()" />

But for some reason or another it doesn't execute it.

Please help !

----EDIT----- This is what I have for the moment.

<DIV data-role="content" data-theme="g">
    <DIV class=ui-grid-g-login>
        <FORM method=post action=[$=PROBE(266)/] data-theme="C">
            <P>~DATA_ERROR~</P>
            <div id="mail" data-role="fieldcontain">
                <label for="mail">Email:*</label>       
                <input id="mail" name="mail" type="email" />
            </div>
            <div id="pass" data-role="fieldcontain">
                <label for="pass">Paswoord:*</label>        
                <input id="pass" name="pass" type="password" />
            </div>
            <div id="remember" data-role="fieldcontain">
                <label for="remember">Onthoud mij</label>       
                <input id="remember" name="remember" type="checkbox" onclick="validate()" />
            </div>
            <P><INPUT class=btn name=submit value=Login type=submit  onclick="validate()"></P>  
        </FORM>
    </DIV>
</DIV><!-- /content -->

<script type=text/javascript>
function validate(){
    var remember = document.getElementById('remember');
    if (remember.checked){
        alert("checked") ;
    }else{
        alert("You didn't check it! Let me check it for you.")
    }
}
</script>

----EDIT--

Solved it, the problem was that the fieldcontain was also named 'remember'

Answer 1

checked is boolean property so you can directly use it in IF condition:-

 <script type="text/javascript">
    function validate() {
        if (document.getElementById('remember').checked) {
            alert("checked");
        } else {
            alert("You didn't check it! Let me check it for you.");
        }
    }
    </script>

Answer 2

Try this:

function validate() {
  var remember = document.getElementById("remember");
  if (remember.checked) {
    alert("checked");
  } else {
    alert("You didn't check it! Let me check it for you.");
  }
}

Your script doesn't know what the variable remember is. You need to get the element first using getElementById().

Answer 3

这应该允许您检查id='remember'元素是否被'checked'

if (document.getElementById('remember').is(':checked')

Answer 4

If you are using this form for mobile app then you may use the required attribute html5. you dont want to use any java script validation for this. It should work

<input id="remember" name="remember" type="checkbox" required="required" />

Answer 5

use like this

<script type=text/javascript>
function validate(){
if (document.getElementById('remember').checked){
          alert("checked") ;
}else{
alert("You didn't check it! Let me check it for you.")
}
}
</script>

<input id="remember" name="remember" type="checkbox" onclick="validate()" />

Answer 6

Use this below simple code: https://jsfiddle.net/Divyesh_Patel/v7a4h3kr/7/

 <input type="checkbox" id="check"> <a href="#" onclick="check()">click</a> <button onclick="check()">button</button> <script> function check() { if (document.getElementById('check').checked) { alert("checked"); } else { alert("Not checked."); } } </script>

Answer 7

This should work

    function validate() {
        if ($('#remeber').is(':checked')) {
            alert("checked");
        } else {
            alert("You didn't check it! Let me check it for you.");
        }
    }

Answer 8

    if (document.getElementById('remember').checked) {
        alert("checked");
    }
    else {
        alert("You didn't check it! Let me check it for you.");
    }

Answer 9

I am using this and it works for me with Jquery :

Jquery:

var checkbox = $('[name="remember"]');

if (checkbox.is(':checked'))
{
    console.log('The checkbox is checked');
}else
{
    console.log('The checkbox is not checked');
}

Is very simple, but work's.

Regards!

Answer 10

//HTML
<input type="checkbox" id="someID">

// JavaScript
const someCheckbox = document.getElementById('someID');

someCheckbox.addEventListener('change', e => {
  if(e.target.checked === true) {
    conlose.log("Checkbox is checked - boolean value: ", e.target.checked)
  }
if(e.target.checked === false) {
    conlose.log("Checkbox is not checked - boolean value: ", e.target.checked)
  }
});

know more

Answer 11

You can use this simple and effective code using pure JS and jQuery.

using validate function as onclick attr

 function validate(el) { if (el.checked) { alert("checked") } else { alert("unchecked") } }

 <input id="remember" name="remember" type="checkbox" onclick="validate(this)" />

OR

using pure JS

 document.addEventListener("DOMContentLoaded", function(event) { //using pure Js code let chk = document.getElementById("remember"); if (chk.checked) { alert("checked") }else{ alert("unchecked") } })

 <input id="remember" name="remember" type="checkbox"/>

using jQuery

 $(document).ready(function () { //using jQuery code $('#remember').on('change', function (e) { if (e.currentTarget.checked) { alert("checked") } else { alert("unchecked") } }) })

 <input id="remember" name="remember" type="checkbox"/> <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>

Answer 12

remember is undefined … and the checked property is a boolean not a number.

function validate(){
    var remember = document.getElementById('remember');
    if (remember.checked){
        alert("checked") ;
    }else{
        alert("You didn't check it! Let me check it for you.")
    }
}

Answer 13

The remember variable is undefined. so try this way:

function validate() {
  var remember = document.getElementById("remember");
  if (remember.checked) {
    alert("checked");
  } else {
    alert("You didn't check it! Let me check it for you.");
  }
}

Answer 14

You can try this:

if ($('#remember').is(':checked')){
   alert('checked');
}else{
   alert('not checked')
}

Answer 15

Use this below simple code: https://jsfiddle.net/Divyesh_Patel/v7a4h3kr/7/

 <input type="checkbox" id="check"> <a href="#" onclick="check()">click</a> <button onclick="check()"> button </button> <script> function check() { if (document.getElementById('check').checked) { alert("checked"); } else { alert("You didn't check it! Let me check it for you."); } } </script>

Answer 16

The below will definitely work. updated 2022

<input onchange="isChecked()" type="checkbox" required="required"/>

<script type="text/javascript">
        let ischeckvariable = false;
    function isChecked() {
        if (!ischeckvariable) {
            ischeckvariable = true;
        } else {
            isckeckvariable = false;
        }
    }
</script>

Answer 17

Try This

<script type="text/javascript">
window.onload = function () {
    var input = document.querySelector('input[type=checkbox]');

    function check() {
        if (input.checked) {
            alert("checked");
        } else {
            alert("You didn't check it.");
        }
    }
    input.onchange = check;
    check();
}
</script>

Answer 18

You can also use JQuery methods to accomplish this:

<script type="text/javascript">
if ($('#remember')[0].checked) 
{
 alert("checked");
}
</script>