javascript - Valid inputs and use animation untill page load -

i need validate filled inputs , on submit if inputs valid show load animation till next page shown. can check validation 1 one, not know how collect them in one. maybe there more simple way check inputs validation? did validations inside inputs in code below. here inputs type need validate , on success show load animation until page refresh page:

<form action="" method="post" enctype="multipart/form-data" name="formz" >    <div>      <label>name: </label>      <input type="text" onkeydown="return keydown.call(this,event)" onchange="value = value.replace(/^\s+/,'')" pattern=".{3,20}" name="name" required>    </div>            <div>      <label>surname: </label>      <input type="text" onkeydown="return keydown.call(this,event)" onchange="value = value.replace(/^\s+/,'')" pattern=".{3,20}" name="surname" required>    </div>            <div>      <label>unic number: </label>      <input type="text" onkeydown="return keydown.call(this,event)" onchange="value = value.replace(/^\s+/,'')" pattern=".{7,7}" maxlength='7' name="unicnumb" required />    </div>    <div>      <label>select:</label>      <select name="select" id="select" required>	      	<option value="0" selected disabled >select</option>      	<option value="1">select1</option>      	<option value="2">select2</option>      </select>    </div>    <div>      <label>phone: </label>      <input type="text" name="phone" id="phone" placeholder="+xxx(xx) xxx-xx-xx" required>    </div>    <div>      <label for="epoct">e-mail</label>      <input type="email" pattern="[a-za-z0-9.-_]{1,}@[a-za-z.-]{2,}[.]{1}[a-za-z]{2,}" class="form-control input-sm" name="epoct" id="epoct" required>    </div>        <button type="submit" name="button" id="button">done</button>  </form>

this outline how i've handled successive form validation jquery:

$(document).ready(function() {     $( "#button" ).submit(function( event ) {         if ( /* validation fails first form element */ ) {             // stop form submission             event.preventdefault();             // display error message             $( "#firstformfieldid" ).append("<span>incorrect entry</span>");             // break out of function ensure validation continues if , if condition met             return false;         }         if ( /* validation fails second form element */ ) {             // stop form submission             event.preventdefault();             // display error message             $( "#secondformfieldid" ).append("<span>incorrect entry</span>");             // break out of function ensure validation continues if , if condition met             return false;         }         if ( /* validation fails third form element */ ) {             // stop form submission             event.preventdefault();             // display error message             $( "#thirdformfieldid" ).append("<span>incorrect entry</span>");             // break out of function ensure validation continues if , if condition met             return false;         }         // ... repeat many form fields need validation          // if validation criteria met, can deploy loading animation here :)         /* loading animation goes here */     }); }); 

you can imagine variations template. instance, rather appending <span>s, add empty <span>s intended contain error messages html. if error message needs displayed, use jquery add text of error message corresponding <span>. actual implementation depend on you, style has worked me.