jQuery Validation対応多重送信防止処理

checkMultiplexSubmit.js

var isSubmit = false;

//jQuery Validationの読み込み確認
if (typeof jQuery != "undefined" && typeof $.validator != "undefined") {
    $.validator.unobtrusive.options = {
        errorPlacement: function ($error, $element) {
            if ($error.text().length === 0) {
                return true;
            } else {
                isSubmit = false;
                //送信ボタンを有効化(checkMultiplexSubmit関数のほうが先に呼ばれるため)
                $(this).closest('form').find("[type='submit']").css('pointer-events', 'auto');
                return false;
            }
        }
    }
}

function checkMultiplexSubmit(form) {

    if (!isSubmit) {
        var elements = form.elements;
        for (var i = 0; i < elements.length; i++) {
            if (elements[i].type == 'submit') {
                //送信ボタンを無効化
                elements[i].style.pointerEvents = "none";
            }
        }
        isSubmit = true;
    }
}