Validating fields when submitting form

I see that you have a standard of 5 inputs on each line tr of a table. You can create an object or array with the validation rules and then map those table rows with the result of the validation of each one.

The method you choose to show the user that you are missing data will have to choose. In my example I will make this visual alert on the line itself. You can adapt to what you need. You also need to specify whether an empty field is accepted or not.

Here's an example:

var regras = [30, 5, 5, 3, 2];

function validar() {
    var linhasFalhadas = $('table tr').each(function () {
        var inputsNaoValidados = $(this).find('input').filter(function (i) {
            var value = parseInt(this.value, 10) || 0;
            return value > regras[i];
        });
        if (inputsNaoValidados.length) $(this).addClass('not_valid');
        else $(this).removeClass('not_valid');;
    });
}
validar();

jsFiddle: link

Simple example of traversing all form inputs with javascript IT WILL GIVE ERROR IF IT IS SOME BLANK * I did not test but apparently did not see error.

$(document).ready(function () {
    $("#cadastro").click(function (e) {
        // bloqueando envio do form
        e.preventDefault();
        var erros = 0;
        // verifica se ha campos vazios
        $("#form1 input").each(function () {
            // conta erros
            $(this).val() == "" ? erros++ : "";
        });
        // verifica se ha erros
        if (erros > 0) {
            alert("Existe(em) campo(os) vazio(os) neste fomulário");
        } else {
            //return true;  
            $("#form1").submit()
        }
    });
});