javascript - Prevent form submission when validation fails on submit button click -

on submit button click need check validation if returns true. need submit form. when returns false form gets submitted , event saveprojects() gets called. how can prevent form submission when checkvalidation() returns false?

 <script type="text/javascript>     function checkvalidation()       {        alert();       return false;       }  </script>     @using (@ajax.beginform("saveprojects", "projects", null, new ajaxoptions { onsuccess =     "onsuccessproject", httpmethod = "post" }, new { id = "projectsform" }))        {     <div class="outerbox" id="divprojectcreate">        @html.partial("../projects/_createoredit", model)          <div class="row centeralign">           <input type="submit" value="save" id="btnsaveprojects"  onclick="checkvalidation()"/>          <input type="button" value="cancel" id="btncancel" />          </div>          </div>  } 

you can do

   $('#target').submit(function() {       alert('handler .submit() called.');       return checkvalidation();     });