Answers for "jQuery.Deferred exception: Illegal invocation TypeError: Illegal invocation"

TypeError: Illegal invocation

Your datatype is not JSON, it’s a FormData. And for jQuery to send a FormData, it needs…
$.ajax({
    type: "POST",
    url: 'signin2.php',
    data: formData,
    processData: false, //add this
    contentType: false, //and this
})

Posted by: Guest on January-27-2021

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