jquery - form not flagging errors on eachstep & running php code when submitted -

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when fields correctit gives msg doesn't run thephp code associated isset how flag errors when next btn clicked before displaying next step/form

 <div class="idealsteps-container"> <nav class="idealsteps-nav"></nav> <form class="idealforms" novalidate autocomplete="off" action="/" method="post">  <div class="idealsteps-wrap">   <!-- step 1 -->  <section class="idealsteps-step"> <div class="field"> <label class="main">book name:</label> <input name="bookname" type="text" > <span class="error"></span> </div>  <div class="field buttons"> <label class="main">&nbsp;</label> <button type="button" class="next">next &raquo;</button> </div> </section>  <!-- step 2-->  <section class="idealsteps-step"> <div class="field"> <label class="main">code:</label> <input name="code" type="text"> <span class="error"></span> </div>  <div class="field buttons"> <label class="main">&nbsp;</label> <button type="button" class="prev">&laquo; prev</button> <button type="submit" id="btn" name="btn" class="submit">submit</button> </div> </section> </div> <span id="invalid"></span> </form> <?php if(isset($_post['btn'])) { echo "submitted"; } ?> <script> $('form.idealforms').idealforms({  silentload: false,  rules: { 'bookname': 'required bookname' },  onsubmit: function(invalid, e) { e.preventdefault(); $('#invalid') .show() .toggleclass('valid', ! invalid) .text(invalid ? (invalid +' invalid fields') : 'all good!');  } }); </script>

currently flags errors when submit btn in step2 clicked,how show errors of tht step before proceeding next step run php code when final submit btn clicked


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