Get the value of checked checkbox?

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So I've got code that looks like this:

<input class="messageCheckbox" type="checkbox" value="3" name="mailId[]">
<input class="messageCheckbox" type="checkbox" value="1" name="mailId[]">

I just need Javascript to get the value of whatever checkbox is currently checked.

EDIT: To add, there will only be ONE checked box.

For modern browsers:

var checkedValue = document.querySelector('.messageCheckbox:checked').value;

By using jQuery:

var checkedValue = $('.messageCheckbox:checked').val();

Pure javascript without jQuery:

var checkedValue = null; 
var inputElements = document.getElementsByClassName('messageCheckbox');
for(var i=0; inputElements[i]; ++i){
      if(inputElements[i].checked){
           checkedValue = inputElements[i].value;
           break;
      }
}

Get the value of checked checkbox?, Return Value: A Boolean, returns true if the checkbox is checked, and false if the checkbox is not checked Example. Find out if a checkbox is checked or not:. To get value for the multiple selections, you have to check each selection if checked. You have to create an array variable and push each checked checkbox to this variable. Get multiple selected checkbox value in an array format using jQuery join function.

None of the above worked for me but simply use this:

document.querySelector('.messageCheckbox').checked;

Happy coding.

HTML DOM Input Checkbox checked Property, To get the value from a checked checkbox, you can use :checked to select the right elements. JS; HTML. JS. In this post, we will see how to get value of a checkbox with JavaScript and jQuery. 1. jQuery With jQuery, you can use the .val() method to get the value of desired input checkbox. For example: [crayon-5f12ddfe29ecc541836278/] [crayon-5f12ddfe29ed4703730231/] Edit in JSFiddle To get the value from a checked checkbox, you can …

I am using this in my code.Try this

var x=$("#checkbox").is(":checked");

If the checkbox is checked x will be true otherwise it will be false.

<input type="checkbox">, In this article we will see how to get the value of check box and radio button. Getting a radio element and it's checked value. Radio button. Radio buttons in a form� When you use it in your form and try to read all checked values as any other elements like – text box, text area, radio button, etc. echo $_POST['lang']; // Checkbox element. you will get the last checked value. You need to send the checkboxes value in the form of an Array when the form gets submitted then you can loop over $_POST values.

in plain javascript:

function test() {
    var cboxes = document.getElementsByName('mailId[]');
    var len = cboxes.length;
    for (var i=0; i<len; i++) {
        alert(i + (cboxes[i].checked?' checked ':' unchecked ') + cboxes[i].value);
    }
}
function selectOnlyOne(current_clicked) {
    var cboxes = document.getElementsByName('mailId[]');
    var len = cboxes.length;
    for (var i=0; i<len; i++) {
        cboxes[i].checked = (cboxes[i] == current);
    }
}

How to get value of a checkbox with JavaScript/jQuery, Summary: in this tutorial, you will learn how to use JavaScript to check if a checkbox is checked, to get values of selected checkboxes, and select / unselect all� The checked is a boolean attribute meaning that the corresponding property is true if the attribute is present, even if the attribute has no value or is set to empty string value or "false". The checked attribute value doesn't change with the state of the checkbox, whereas the checked property changes.

$(document).ready(function() {
  var ckbox = $("input[name='ips']");
  var chkId = '';
  $('input').on('click', function() {
    
    if (ckbox.is(':checked')) {
      $("input[name='ips']:checked").each ( function() {
   			chkId = $(this).val() + ",";
        chkId = chkId.slice(0, -1);
 	  });
       
       alert ( $(this).val() ); // return all values of checkboxes checked
       alert(chkId); // return value of checkbox checked
    }     
  });
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input type="checkbox" name="ips" value="12520">
<input type="checkbox" name="ips" value="12521">
<input type="checkbox" name="ips" value="12522">

How to get the value of a form element : check box and radio button , The Input Checkbox Value property in HTML DOM is used to set or return the value of the value attribute of an value = "1" checked>Checked by default< br > . For checkboxes, the contents of the value property do not appear in the user interface. The value property only has meaning when submitting a form. If a checkbox is in checked state when the form is submitted, the name of the checkbox is sent along with the value of the value property (if the checkbox is not checked, no information is sent).

JavaScript Checkbox, How to get the values of checked checkboxes in JavaScript Code: com/how-to- get-the Duration: 2:23 Posted: Jun 14, 2016 The value attribute is one which all <input>s share; however, it serves a special purpose for inputs of type checkbox: when a form is submitted, only checkboxes which are currently checked are submitted to the server, and the reported value is the value of the value attribute.

HTML, The :checked selector works for checkboxes, radio buttons, and options of select <input type="checkbox" name="newsletter" value="Monthly" checked>. It's time for me to solve the mystery of HTML unchecked checkbox values. I guess it would be the most searched trick about basic HTML forms and checkboxes.

How to get the values of checked checkboxes in JavaScript, In this tutorial we will explain how to get selected Checkboxes value Using jQuery. First user need to select one or more checkbox field in a form then we will get all value of checkbox in an array. The jQuery :checked selector can be used with the each() method to retrieve the values of all checkboxes selected in group.

Comments
  • You needs javascript code or jQuery?
  • Why not use radio button?
  • Because I'm writing a plugin for a site
  • If you need only one checkbox, why don't you use radio buttons? this is the more suitable UI component for this job.
  • @TalYaron Can you deselect a radio buttons ? I think not without js code. Maybe the OP want to deselect the box easily.
  • @Mageek it's bad practice to add same id on multiple elements.
  • @Engineer No, just putting a different id for each checkbox.
  • @Engineer "Saving bytes" because we must simply write document.getElementById("foo").value(); and "saving calculations" because getElementById is surely speedier than getElementsByTagName and a loop.
  • for jQuery .is(":checked") is the correct way as .val() will return the attribute value if its defined.. and even if its not defined it will return "on" and not a boolean value.. jsfiddle.net/d5f7wnzu
  • document.querySelector('.messageCheckbox:checked').value generates TypeError if no checkbox is checked