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My onsubmit is not working. My idea was to put some mandatory fields and, in order to achieve that, I was using the onsubmit method inside a form in HTML that called a JavaScript function. The idea was if all the mandatory fields were filled, the javascript function would return true and it would move on to page /control/Cadastro.php . Otherwise, if any mandatory field was empty, it would return false and it wouldn't move to page /control/Cadastro.php , staying in the current page until true. Unfortunately, the function does return false if all the mandatory fields are not filled, as expected, but it still moves to page /control/Cadastro.php , even if it shouldn't. I'm going to cut off some code to make my point of view perceptible. <!DOCTYPE html> <html> <head> <script> function ValidateRequiredFields() { var message = new String('\nCampos obrigatórios:\n'); var flag=new Boolean(1); var x=document.forms["theForm"]["nr_processoCA"].value; if (x==null || x==""){ message += '\nNº do processo\n'; flag = new Boolean(0); } if (flag == false){ alert(message); } return flag; } </script> </head> <body> <form name="theForm" onsubmit="return ValidateRequiredFields()" method="post" action="../control/Cadastro.php"> Nº do Processo: <br> <input type="text" name="nr_processoCA" class="input-xlarge"> <br> <div class="row-fluid" style="text-align:center;"> <input type="submit" class="btn btn-primary btn-large" value="Gravar"> &

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