Validar Submit en javascript und C 
espero me puedan ayudar. Estoy prgramando microcontrolador que tienen un servidor Web. la programacion es en C. estoy tratando de hacer un formulario dinamico. Un formulario genere el otro. el problema que tengo es al oprimir el boton submit me genera el otro formulario sin importar la valiacion de los campos. No como hacer para que esto no suceda. ya que en C estoy activando el otro formulario. Existe algun script en el cual pueda activar el "for" dependiendo de alguna variable dentro del mismo formmulario? algo asi como un "if"
. Adjunto codigo...espero relamente me puedan ayudar o enviar un codigo o script.
Saludos
,Código PHP:
void cgiPV_editPV(char* buffer, photovoltaik_t* pv) {
int i = 0;
strcat (buffer," <head>"
"<script type=\"text/javascript\">"
" function validarn(e) { "// 1
" tecla = (document.all) ? e.keyCode : e.which; "// 2
" if (tecla==8) return true;" // 3
" patron = /[1234567890.]/;" // 4
" te = String.fromCharCode(tecla);" // 5
" return patron.test(te);" // 6
"} "
"function validar(){"
"if(formulario.namepv.value == \"\"){"
"alert('Insert Name de PV');"
"}"
"if(formulario.maxPIpv.value == \"\"){"
"alert('Insert Maximal PI');"
"}"
"document.formulario.submit();"
"}" );
strcat (buffer, " </script> " );
strcat(buffer, " <form name=formulario>\r\n");
strcat(buffer, " <table class=\"photovoltaik\">\r\n");// que se vea mas gordo
strcat(buffer, " <tr>\r\n");
strcat(buffer, " <th colspan=\"2\">PHOTOVOLTAIK\r\n");/// escribe
strcat(buffer, " </th>\r\n");
strcat(buffer, " </tr>\r\n");
strcat(buffer, " <tr>\r\n");
strcat(buffer, " <td> </td>\r\n");
strcat(buffer, " <td>\r\n");
strcat(buffer, " <form method=\"get\">\r\n");
strcat(buffer, " <input type=\"hidden\" name=\"mode\" value=\"1\">\r\n");// EDITAR/ Grabar, Agragar
strcat(buffer, " <input type=\"hidden\" name=\"what\" value=\"1\">\r\n");// Elemeto del PV-Anlage
strcat(buffer, " <p>Name PV:<input type=\"text\" name=\"namepv\" value=\"\">\r\n");
strcat(buffer, " <p>Max PI PV:<input type=\"text\" name=\"maxPIpv\" onkeypress=\"return validarn(event)\" value=\"\">\r\n");
//strcat(buffer, " <input type=\"submit\">\r\n");
strcat(buffer, " <input type=\"Submit\" OnClick=\"validar();\" /></td></tr>");
strcat(buffer, " </form>\r\n");
strcat(buffer, " </td>\r\n");
strcat(buffer, " </tr>\r\n");
strcat(buffer, " </tr>\r\n");
for(i = 0; i < pv->pi_count; i++)
{
strcat(buffer, " <td> </td>\r\n");
strcat(buffer, " <tr>\r\n");
strcat(buffer, " <td> </td>\r\n");//
strcat(buffer, " <td>\r\n");
cgiPV_editPI(buffer, pv->pi[i],i);
strcat(buffer, " </td>\r\n");
strcat(buffer, " </tr>\r\n");
}
strcat(buffer, "</table>\r\n");
strcat(buffer, " </body>\r\n");
strcat(buffer, " </html>");
}
void cgiPV_editPI(char* buffer, powerinverter_t *pi, int pi_ID) {
int i = 0;
char foo[10];
sprintf(foo, "%d", pi_ID);
strcat(buffer, " <form>\r\n");
strcat(buffer, " <table class=\"powerinverter\">\r\n");
strcat(buffer, " <tr>\r\n");
strcat(buffer, " <th colspan=\"2\">POWERINVERTER\r\n");
strcat(buffer, " </th>\r\n");
strcat(buffer, " </tr>\r\n");
strcat(buffer, " <tr>\r\n");
strcat(buffer, " <td> </td>\r\n");
strcat(buffer, " <td>\r\n");
strcat(buffer, " <form method=\"get\">\r\n");
strcat(buffer, " <input type=\"hidden\" name=\"mode\" value=\"1\">\r\n");// EDITAR/ Grabar, Agragar
strcat(buffer, " <input type=\"hidden\" name=\"what\" value=\"2\">\r\n");// Elemeto del PV-Anlage
strcat(buffer, " <input type=\"hidden\" name=\"where\" value=\"");// es el ID de cada elemto cuando hay ma(MS
strcat(buffer, foo);//saber cual PI es
strcat(buffer, " \">\r\n");
strcat(buffer, " <p >Name PI:<input type=\"text\" name=\"namepi\" value=\"\">\r\n");
strcat(buffer, " <p >Serie PI:<input type=\"text\" name=\"seriepi\" value=\"\">\r\n");
strcat(buffer, " <p >Min Volt PI:<input type=\"text\" name=\"minVpi\" value=\"\">\r\n");
strcat(buffer, " <p >Max Volt PI:<input type=\"text\" name=\"maxVpi\" value=\"\">\r\n");
strcat(buffer, " <p >Max I PI:<input type=\"text\" name=\"maxIpi\" value=\"\">\r\n");
strcat(buffer, " <p >Max P PI:<input type=\"text\" name=\"maxPpi\" value=\"\">\r\n");
strcat(buffer, " <p>Max MPP pi:<input type=\"text\" name=\"maxMpppi\" value=\"\">\r\n");
strcat(buffer, " <input type=\"submit\">\r\n");
strcat(buffer, " </form>\r\n");
strcat(buffer, " </td>\r\n");
strcat(buffer, " </tr>\r\n");
strcat(buffer, " </tr>\r\n");
for(i = 0; i < pi->mpps_count; i++) {
printf("maxmpp: %d\n",pi->mpps_count);
strcat(buffer, " <tr>\r\n");
strcat(buffer, " <td> </td>\r\n");//
strcat(buffer, " <td>\r\n");
cgiPV_editMPP(buffer, pi->mpps[i],pi_ID, i);
strcat(buffer, " </td>\r\n");
strcat(buffer, " </tr>\r\n");
}
strcat(buffer, "</table>\r\n");
}
