Make alert window when clicking a disabled button

问题

I have a button which by default is disable, but when a checkbox is checked the button is then enabled. I would like to edit the script to make an alert window when the button is clicked when disabled, to make sure the user knows he/she has to check the checkbox.

My script so far:

<script type="text/javascript">
$('#terms').on('change', function(){
          if ($(this).is(':checked')){
             $('#customButton').removeProp('disabled');
          }
          else{
             $('#customButton').attr('disabled', 'disabled');
          }
       });
</script>

<form id="payment-form" action="chargeCard.php" method="POST" name="payment-form">
<input type="checkbox" id="terms" />
<input type="image"  src="button3.png" id="customButton" value="submit" alt="button" disabled="disabled"/>
</form>

回答1:

I've made a Fiddle

Here's the code:

HTML

<form id="payment-form" action="chargeCard.php" method="POST" name="payment-form">
<input type="checkbox" id="terms" />
<input type="button"  id="customButton" value="submit" alt="button" class="disabled"/>
</form>

$('#terms').on('change', function(){
if ($(this).is(':checked')){
    $('#customButton').removeClass('disabled');
}
else{
    $('#customButton').addClass('disabled');
}
});

$('#customButton').on('click',function(e){
if( $(this).hasClass('disabled') ){
    e.preventDefault();
    alert('Please confirm . . .');
}else{
    alert('go ahead...');
};
});

The long and short of it is, if an element is 'disabled' all events that happen on it are suppressed. In my fiddle I've 'faked' a disabled button using a style so the click event is still visible to the browser.

回答2:

$("#customButton").click(function(){
if !($("#terms").is(':checked'))
 {
 alert("Accept terms first!");
 }
})

if your browser can not detect click on a disabled button, Warp the button inside a div and change the function to click on that div.

来源：https://stackoverflow.com/questions/29913997/make-alert-window-when-clicking-a-disabled-button

标签

javascript

html

forms

button

checkbox