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Uncaught TypeError: Illegal invocation

Sometimes you got error Uncaught TypeError: Illegal invocation while submit a form using ajax in javascript. There could be any reason for this error but in my case I have found this error because I did not pass the the processData: false, to $.ajax() settings.

Answers 1

Solution for error uncaught TypeError: Illegal invocation

<!-- processData: false, to ajax settings -->
<script>
$('#form').on('submit', function(e){
    e.preventDefault();
    var formData = new FormData($(this)[0]);
    $.ajax({
        type: "POST",
        dataType: "json",
        processData: false,
        url: "/add-record",
        data: formData,
        success: function(data){
            return 'response';
            console.log(data);
        }
    }); 
});
</script>

Add processData: false, as key/value pair to ajax settings to avoid the error Uncaught TypeError: Illegal invocation while calling ajax on form submit.

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Uncaught TypeError: Illegal invocation

Solution for error uncaught TypeError: Illegal invocation