javascript - How to submit a form using jQuery? -

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i want submit form using jquery, have 4 fields needed checked, when submit, displays first alert submit doesn't check if fields valid or not. what's error in code? appreciated. 

$(document).ready(function(){     $('input[name=subdomain]').keyup(subdomain_check); $('input[name=password]').keyup(password_strenght); $('input[name=c_password]').keyup(password_check); $('input[name=email]').keyup(email_check);  $('#install').on('submit', function(){ alert("submit"); if ($('input[name=subdomain]').valid() == true && $('input[name=password]').valid() == true && $('input[name=c_password]').valid() == true &&   $('input[name=email]').valid() == true){     alert("true");     return true; } else {     alert("false");     return false;     } });  });

here's html form :

<form class="form-horizontal" method="post" id="install" action="etape2.html" role="form">         <input type="hidden" id="install-element-0" value="install" name="form">         <input type="hidden" id="install-element-1" value="insert" name="action">             <div class="col-md-6">                     <input type="text" id="install-element-2" required="" name="title" class="form-control input-md col-md-6">             </div>             <div class="col-md-6">                 <input type="text" id="install-element-3" required="" name="first_name" class="form-control input-md col-md-6">             </div>             <div class="col-md-6">                 <input type="text" id="install-element-4" required="" name="last_name" class="form-control input-md col-md-6">             </div>             <div class="col-md-6">                 <input type="text" id="install-element-5" required="" name="email" class="form-control input-md col-md-6">              </div>             <div class="col-md-6">                 <input type="password" id="install-element-6" required="" class="form-control input-md col-md-6" name="password">         </div>             <div class="col-md-6">             <input type="password" id="install-element-7" required="" class="form-control input-md col-md-6" name="c_password">             </div>               <div class="col-md-6"><input type="text" required="" placeholder="" id="subdomain" name="subdomain" class="form-control input-md col-md-6">             <div class="form-actions col-md-9 col-md-offset-3 text-right">                 <input type="submit" id="install-element-9" class="btn btn-primary" name=""value="valider">             </div>         </div> </form>

is there way check functions return , not validate ?

add:

$('#install').on('submit', function(e){     e.preventdefault();     [..] }

to code


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