jQuery plugin to prevent multiple HTML form submits. With support for custom validator logic, custom submit action, as well as a timeout to re-enable submits. Submit buttons are disabled for UI feedback.

jquery.preventDoubleSubmit.js

/*
	jQuery Prevent Double Submit Plugin by Florian Kollmann <floko84@gmail.com>
*/
; (function ($) {
	"use strict";
	var pluginName = "preventDoubleSubmit",
		defaults = {
			valid: function () {
				// run jQuery validate if available
				return !$.isFunction($.fn.valid) || $(this).valid();
			},
			submit: $.noop,
			timeout: Number.POSITIVE_INFINITY,
		};

	function Plugin(element, options) {
		this.element = element;
		this.settings = $.extend({}, defaults, options);
		this.init();
	}

	$.extend(Plugin.prototype, {
		init: function () {
			this.submitted = false;
			this.buttons = [];
			this.delay = 250;
			$(this.element).submit($.proxy(this.onSubmit, this));
		},
		onSubmit: function (event) {
			if (this.submitted) {
				// block multiple submits
				return false;
			}
			if (!this.isValid()) {
				// allow validators to run
				event.preventDefault();
				return true;
			}

			var result = true;
			if ($.isFunction(this.settings.submit)) {
				// call submit handler, if any
				result = this.settings.submit.call(this.element, event);
			}

			this.disable();
			return result;
		},
		disable: function () {
			this.submitted = true;
			this.buttons = $(this.element).find('[type="submit"]').not(':disabled');

			window.setTimeout($.proxy(function () {
				$(this.buttons).prop('disabled', true);

				if ($.isNumeric(this.settings.timeout)) {
					window.setTimeout($.proxy(this.enable, this), this.settings.timeout);
				}
			}, this), this.delay);
		},
		enable: function () {
			this.submitted = false;
			$(this.buttons).prop('disabled', false);
		},
		isValid: function () {
			return !$.isFunction(this.settings.valid)
				|| this.settings.valid.call(this.element);
		},
	});

	$.fn[pluginName] = function (options) {
		return this.each(function () {
			if (!$.data(this, "plugin_" + pluginName)) {
				$.data(this, "plugin_" +
					pluginName, new Plugin(this, options));
			}
		});
	};

	$(function () {
		// auto-load for class
		$('form.prevent-double-submit')[pluginName]();
	})
})(jQuery);