oncheck listener for checkbox in javascript

Question

I have code like this at the bottom of my form.

<p>
  <input type="checkbox" id="agreed">
  I agree to keep my Username and Password confidential and uphold 
  the integrity of this pharmacy
</p>
<input type="submit" id="submit" disabled class="formbutton button-primary" value="Go">

I want this a listener in JavaScript to be able to enable the submit button. I know it might be wrong or something but my JavaScript looks sort of like this

function track() {
    if ( document.getElementById("agreed").checked==true ) {
        document.getElementById("submit").removeAttribute("disabled");
    } else {
        document.getElementById("agreed").checked==false
    }
};

Answer 1

You can do this for the input:

<input type='checkbox' onchange='handleChange(this);'>Checkbox 

And this for enabling the button:

function handleChange(checkbox) {     if(checkbox.checked == true){         document.getElementById("submit").removeAttribute("disabled");     }else{         document.getElementById("submit").setAttribute("disabled", "disabled");    } } 

Answer 2

Try Below for your requirement using jQuery.

$('#checky').click(function(){
     
    if($(this).attr('checked') == false){
         $('#postme').attr("disabled","disabled");   
    }
    else {
        $('#postme').removeAttr('disabled');
    }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>
<input type="checkbox" checked="checked" id="checky"><a href="#">I agree to keep my Username and Password confidential and uphold 
  the integrity of this pharmacy</a>
<br>
<input type="submit" id="postme" value="submit">

Using JavaScript, Please refer This