Jquery serialize（）为空

Question

我是一个通过AJAX将数据发送到PHP脚本的联系表单。它非常基本但我无法通过序列化获得输入值。表单ID是正确的，我获取输入名称，但不是他们的值。这是我的代码。谢谢！

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	//Contact form AJAX
    var form = $('#contact-form');
    var formMessages = $('#form-messages');
    // Serialize the form data.
	var formData = $(form).serialize();
	console.log($(form).serialize());
    // Set up an event listener for the contact form.
	$(form).submit(function(event) {
	    // Stop the browser from submitting the form.
	    event.preventDefault();
		// Submit the form using AJAX.
		$.ajax({
			type: 'POST',
			url: $(form).attr('action'),
			data: formData
		})
		.done(function(response) {
			// Make sure that the formMessages div has the 'success' class.
			$(formMessages).hide().fadeIn();
			$(formMessages).removeClass('error');
			$(formMessages).addClass('success');

			// Set the message text.
			$(formMessages).text(response);

			// Clear the form.
			$('#form_name').val('');
			$('#form_email').val('');
			$('#form_message').val('');
		})
		.fail(function(data) {
			// Make sure that the formMessages div has the 'error' class.
			$(formMessages).hide().fadeIn();
			$(formMessages).removeClass('success');
			$(formMessages).addClass('error');

			// Set the message text.
			if (data.responseText !== '') {
				$(formMessages).text(data.responseText);
			} else {
				$(formMessages).text("Something went wrong.");
			}
		});
	});

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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="contact-form" class="col-md-12" method="post">
                        <h1>Contact</h1>
                        <fieldset class="form-group">
                            <input type="text" id="form_name" name="form_name" class="form-control" placeholder="Your name">
                        </fieldset>
                        <fieldset class="form-group">
                            <input type="email" id="form_email" name="form_email" class="form-control" placeholder="Your email" required>
                        </fieldset>
                            <fieldset class="form-group">
                        <textarea class="form-control" id="form_message" name="form_message" rows="3" placeholder="Your message" required></textarea>
                        </fieldset>
                        <button type="submit" class="btn btn-primary">Send</button>                     
                    </form>

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 https://jsfiddle.net/huja5pru/2/

Answer 1

Use serialize() method when form is submit.

check this fiddle https://jsfiddle.net/6o6htoh1/1/

Answer 2

将jquery选择器用于jquery对象时出现语法错误，当您选择表单时，必须最近使用它，如下所示：

var form = $('#contact-form'); //and then use it directly in the ajax call like this
form.serialize(); // not $(form).serialize()

这是您的小提琴已更新https://jsfiddle.net/ingemi/kbpnmptw/您必须在ajax调用中直接使用序列化