Asp.net c#不能使用jquery查看输入文本类型

我使用jquery制作登录/注册对话框，但c#代码无法看到文本框输入字段，我需要使用c#代码从这些文本框字段中获取值请帮助谢谢你！ASP。. NET/c#/JQuery

HTML:

 <header role="banner">
        <div id="cd-logo"><a href="#0"><img src="http://codyhouse.co/demo/login-signup-modal-window/img/cd-logo.svg" alt="Logo"></a></div>
        <nav class="main-nav">
            <ul>
                <!-- inser more links here -->
                <li><a class="cd-signin" href="#0">Sign in</a></li>
                <li><a class="cd-signup" href="#0">Sign up</a></li>
            </ul>
        </nav>
    </header>
    <div class="cd-user-modal"> <!-- this is the entire modal form, including the background -->
        <div class="cd-user-modal-container"> <!-- this is the container wrapper -->
            <ul class="cd-switcher">
                <li><a href="#0">Sign in</a></li>
                <li><a href="#0">New account</a></li>
            </ul>
            <div id="cd-login"> <!-- log in form -->
                <form class="cd-form">
                    <p class="fieldset">
                        <label class="image-replace cd-email" for="signin-email">E-mail</label>
                        <input class="full-width has-padding has-border" id="signin-email" type="email" placeholder="E-mail">
                        <span class="cd-error-message">Error message here!</span>
                    </p>
                    <p class="fieldset">
                        <label class="image-replace cd-password" for="signin-password">Password</label>
                        <input class="full-width has-padding has-border" id="signin-password" type="text"  placeholder="Password">
                        <a href="#0" class="hide-password">Hide</a>
                        <span class="cd-error-message">Error message here!</span>
                    </p>
                    <p class="fieldset">
                        <input type="checkbox" id="remember-me" checked>
                        <label for="remember-me">Remember me</label>
                    </p>
                    <p class="fieldset">
                        <input class="full-width" type="submit" value="Login">
                    </p>
                </form>
                <p class="cd-form-bottom-message"><a href="#0">Forgot your password?</a></p>
                <!-- <a href="#0" class="cd-close-form">Close</a> -->
            </div> <!-- cd-login -->
            <div id="cd-signup"> <!-- sign up form -->
                <form class="cd-form">
                    <p class="fieldset">
                        <label class="image-replace cd-username" for="signup-username">Username</label>
                        <input class="full-width has-padding has-border" id="signup-username" type="text" placeholder="Username">
                        <span class="cd-error-message">Error message here!</span>
                    </p>
                    <p class="fieldset">
                        <label class="image-replace cd-email" for="signup-email">E-mail</label>
                        <input class="full-width has-padding has-border" id="signup-email" type="email" placeholder="E-mail">
                        <span class="cd-error-message">Error message here!</span>
                    </p>
                    <p class="fieldset">
                        <label class="image-replace cd-password" for="signup-password">Password</label>
                        <input class="full-width has-padding has-border" id="signup-password" type="text"  placeholder="Password">
                        <a href="#0" class="hide-password">Hide</a>
                        <span class="cd-error-message">Error message here!</span>
                    </p>
                    <p class="fieldset">
                        <input type="checkbox" id="accept-terms">
                        <label for="accept-terms">I agree to the <a href="#0">Terms</a></label>
                    </p>
                    <p class="fieldset">
                        <input class="full-width has-padding" type="submit" value="Create account">
                    </p>
                </form>
                <!-- <a href="#0" class="cd-close-form">Close</a> -->
            </div> <!-- cd-signup -->
            <div id="cd-reset-password"> <!-- reset password form -->
                <p class="cd-form-message">Lost your password? Please enter your email address. You will receive a link to create a new password.</p>
                <form class="cd-form">
                    <p class="fieldset">
                        <label class="image-replace cd-email" for="reset-email">E-mail</label>
                        <input class="full-width has-padding has-border" id="reset-email" type="email" placeholder="E-mail">
                        <span class="cd-error-message">Error message here!</span>
                    </p>
                    <p class="fieldset">
                        <input class="full-width has-padding" type="submit" value="Reset password">
                    </p>
                </form>
                <p class="cd-form-bottom-message"><a href="#0">Back to log-in</a></p>
            </div> <!-- cd-reset-password -->
            <a href="#0" class="cd-close-form">Close</a>
        </div> <!-- cd-user-modal-container -->
    </div> <!-- cd-user-modal -->

JQuery

    jQuery(document).ready(function($){
    var $form_modal = $('.cd-user-modal'),
        $form_login = $form_modal.find('#cd-login'),
        $form_signup = $form_modal.find('#cd-signup'),
        $form_forgot_password = $form_modal.find('#cd-reset-password'),
        $form_modal_tab = $('.cd-switcher'),
        $tab_login = $form_modal_tab.children('li').eq(0).children('a'),
        $tab_signup = $form_modal_tab.children('li').eq(1).children('a'),
        $forgot_password_link = $form_login.find('.cd-form-bottom-message a'),
        $back_to_login_link = $form_forgot_password.find('.cd-form-bottom-message a'),
        $main_nav = $('.main-nav');
    //open modal
    $main_nav.on('click', function(event){
        if( $(event.target).is($main_nav) ) {
            // on mobile open the submenu
            $(this).children('ul').toggleClass('is-visible');
        } else {
            // on mobile close submenu
            $main_nav.children('ul').removeClass('is-visible');
            //show modal layer
            $form_modal.addClass('is-visible'); 
            //show the selected form
            ( $(event.target).is('.cd-signup') ) ? signup_selected() : login_selected();
        }
    });
    //close modal
    $('.cd-user-modal').on('click', function(event){
        if( $(event.target).is($form_modal) || $(event.target).is('.cd-close-form') ) {
            $form_modal.removeClass('is-visible');
        }   
    });
    //close modal when clicking the esc keyboard button
    $(document).keyup(function(event){
        if(event.which=='27'){
            $form_modal.removeClass('is-visible');
        }
    });
    //switch from a tab to another
    $form_modal_tab.on('click', function(event) {
        event.preventDefault();
        ( $(event.target).is( $tab_login ) ) ? login_selected() : signup_selected();
    });
    //hide or show password
    $('.hide-password').on('click', function(){
        var $this= $(this),
            $password_field = $this.prev('input');
        ( 'password' == $password_field.attr('type') ) ? $password_field.attr('type', 'text') : $password_field.attr('type', 'password');
        ( 'Hide' == $this.text() ) ? $this.text('Show') : $this.text('Hide');
        //focus and move cursor to the end of input field
        $password_field.putCursorAtEnd();
    });
    //show forgot-password form 
    $forgot_password_link.on('click', function(event){
        event.preventDefault();
        forgot_password_selected();
    });
    //back to login from the forgot-password form
    $back_to_login_link.on('click', function(event){
        event.preventDefault();
        login_selected();
    });
    function login_selected(){
        $form_login.addClass('is-selected');
        $form_signup.removeClass('is-selected');
        $form_forgot_password.removeClass('is-selected');
        $tab_login.addClass('selected');
        $tab_signup.removeClass('selected');
    }
    function signup_selected(){
        $form_login.removeClass('is-selected');
        $form_signup.addClass('is-selected');
        $form_forgot_password.removeClass('is-selected');
        $tab_login.removeClass('selected');
        $tab_signup.addClass('selected');
    }
    function forgot_password_selected(){
        $form_login.removeClass('is-selected');
        $form_signup.removeClass('is-selected');
        $form_forgot_password.addClass('is-selected');
    }
    //REMOVE THIS - it's just to show error messages 
    $form_login.find('input[type="submit"]').on('click', function(event){
        event.preventDefault();
        $form_login.find('input[type="email"]').toggleClass('has-error').next('span').toggleClass('is-visible');
    });
    $form_signup.find('input[type="submit"]').on('click', function(event){
        event.preventDefault();
        $form_signup.find('input[type="email"]').toggleClass('has-error').next('span').toggleClass('is-visible');
    });

    //IE9 placeholder fallback
    //credits http://www.hagenburger.net/BLOG/HTML5-Input-Placeholder-Fix-With-jQuery.html
    if(!Modernizr.input.placeholder){
        $('[placeholder]').focus(function() {
            var input = $(this);
            if (input.val() == input.attr('placeholder')) {
                input.val('');
            }
        }).blur(function() {
            var input = $(this);
            if (input.val() == '' || input.val() == input.attr('placeholder')) {
                input.val(input.attr('placeholder'));
            }
        }).blur();
        $('[placeholder]').parents('form').submit(function() {
            $(this).find('[placeholder]').each(function() {
                var input = $(this);
                if (input.val() == input.attr('placeholder')) {
                    input.val('');
                }
            })
        });
    }
});

//credits http://css-tricks.com/snippets/jquery/move-cursor-to-end-of-textarea-or-input/
jQuery.fn.putCursorAtEnd = function() {
    return this.each(function() {
        // If this function exists...
        if (this.setSelectionRange) {
            // ... then use it (Doesn't work in IE)
            // Double the length because Opera is inconsistent about whether a carriage return is one character or two. Sigh.
            var len = $(this).val().length * 2;
            this.setSelectionRange(len, len);
        } else {
            // ... otherwise replace the contents with itself
            // (Doesn't work in Google Chrome)
            $(this).val($(this).val());
        }
    });
};
jQuery('#cody-info ul li').eq(1).on('click', function(){
$('#cody-info').hide();
});