javascript - Auto execute when input changes -

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i started learning php , want make simple plugin wordpress. have written , set calculate $resultado on submit. working fine want $result auto-calculate everytime change input value can see result everytime , not have press button.

is possible javascript?

function formulario_webbudget(){ ?> <form action="" method="post">   nombre: <input type="text" maxlength="30" value="<?php echo htmlspecialchars($_post['nombre']); ?>" name="nombre" required><br>   apellido: <input type="text" maxlength="40" value="<?php echo htmlspecialchars($_post['apellido']); ?>" name="apellido" required><br>   correo: <input type="email" value="<?php echo htmlspecialchars($_post['correo']); ?>" name="correo" required><br>   <hr>   <input type="checkbox" name="check" <?php if(isset($_post['check'])) { echo "checked"; }?>> seo check<br>    dominio   <select name="dominio">     <option>no</option>     <option <?php if ($_post['dominio'] == 'si') { echo 'selected'; } ?> value="si">si (20€)</option>   </select><br>     hosting   <select name="hosting">     <option>no</option>     <option <?php if ($_post['hosting'] == 'si') { echo 'selected'; } ?> value="si">si (50€)</option>   </select><br>     diseño adaptado patatin patatan   <select name="diseno">     <option>no</option>     <option <?php if ($_post['diseno'] == 'si') { echo 'selected'; } ?> value="si">si (200€)</option>   </select><br>     posisionamiento seo patatin patatan   <select name="seo">     <option>no</option>     <option <?php if ($_post['seo'] == 'si') { echo 'selected'; } ?> value="si">si (100€)</option>   </select><br>    numero de paginas patatin patatan   <input type="number" name="paginas"><br>    observaciones:       <textarea name="observaciones" maxlength="500" placeholder="escriba sus observaciones">     <?php      if(isset($_post['observaciones'])) {        echo htmlentities ($_post['observaciones']);      }     ?>   </textarea>    <p><input type="submit" value="calcular"></p>  </form>  <?php  if (isset($_post['check'])) {     $valor6 = '70'; }  if ($_post['dominio'] == 'si'){     $valor1 = '20';     $dominio = 'dominio blablabla'; } if ($_post['hosting'] == 'si'){     $valor2 = '50';     $hosting = 'hosting blablabla'; }  if ($_post['seo'] == 'si'){     $valor3 = '100';     $seo = 'seo blablabla'; } if ($_post['diseno'] == 'si'){     $valor4 = '200';     $diseno = 'diseno blablabla'; }  $valor5 = $_post['paginas'] * '50';  $resultado = $valor1 + $valor2 + $valor3 + $valor4 + $valor5 + $valor6; echo 'el presupuesto base para su web sería de ' , $resultado , '€'; ?>   <?php } add_shortcode('webbudget', 'formulario_webbudget'); ?>


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