I am curious and I want to get rid of the doubt, in which cases a variable is declared in the following way:
public short? Secuendia {get; set;}
What does the question mark mean and in which cases the data type is accompanied by a character?
I am curious and I want to get rid of the doubt, in which cases a variable is declared in the following way:
public short? Secuendia {get; set;}
What does the question mark mean and in which cases the data type is accompanied by a character?
I have a calculation form with JavaScript, what happens is that I saw a tutorial on calculations with JavaScript but everything is done in real time, that is, as shown in the image:
These data are displayed without me pressing the "Calculate" button, what I want is that these data are not displayed until I press the calculate button.
The html code for the site is this (also available on Ghostbin ):
//Link del javascript: https://ghostbin.com/paste/urg7z
<?php
session_start();
if(!$_SESSION['user']){
header ("Location: ingresar.php");
}
?>
<!DOCTYPE html>
<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<title>Remesas ENVIA - Calculo en dolares</title>
<style type="text/css">
.auto-style1 { text-align: center; }
.auto-style2 { background-image: url('img/bg_calculo_dolares.jpg'); }
.auto-style3 { border-width: 0px; }
.auto-style4 { text-align: left; font-family: Arial, Helvetica, sans-serif; }
.auto-style5 { font-size: 55pt; }
.auto-style6 { text-align: left; }
.auto-style7 { text-align: left; font-family: Arial,Helvetica, sans-serif; font-size: 55pt; }
.auto-style8 { font-family: Arial, Helvetica, sans-serif; }
.auto-style9 { font-size: 55pt; font-weight: bold; }
.auto-style10 { text-align: right; }
.auto-style11 { font-size: 55pt; color: #00A743; }
</style>
<script type="text/javascript"src="/js/calculo.js"></script>
</head>
<body style="background-color: #F37300; margin-top: 27px; height: 1612px;">
<table align="center" cellpadding="0" cellspacing="0" style="width: 940px; height: 1560px" class="auto-style2">
<tr>
<td class="auto-style1" style="width: 940px; height: 230px" colspan="2"></td>
</tr>
<tr>
<td class="auto-style10" style="width: 538px; height: 170px;">
<input type="number" id="valor1" onkeyup="sumar();" size="23" style="font-family: Arial; font-size: 85pt; height: 160px; width: 410px;" required class="auto-style11"> </td>
<td class="auto-style1" style="width: 470px; height: 170px;">
<img alt height="168" onclick="sumar()" src="img/button_calcula.jpg" style="float: left" width="370" class="auto-style11"></td>
</tr>
<tr>
<td class="auto-style1" style="width: 940px; height: 1110px;" colspan="2">
<p> </p>
<p class="auto-style4"><span class="auto-style5"> Si envias a Mexico</span></p>
<div class="auto-style6"><span class="auto-style5"> <span class="auto-style8"><strong>$</strong></span></span>
<strong>
<input type="text" id="valor2" disabled value="0" size="23" style="font-family: Arial; font-size: 55pt; height: 75px; width: 335px;" required class="auto-style9"></strong>
<span class="auto-style7">dolares</span></div>
<p class="auto-style4"><span class="auto-style5"> tu familia recibe</span></p>
<div class="auto-style6"><span class="auto-style5"> <span class="auto-style8"><strong>$</strong></span></span>
<strong>
<input type="text" id="valor3" disabled value="0" size="23" style="font-family: Arial; font-size: 55pt; height: 75px; width: 335px;" required class="auto-style9"></strong>
<span class="auto-style7">pesos,</span></div>
<p class="auto-style4"><span class="auto-style5"> tu envio cuesta</span></p>
<div class="auto-style6"><span class="auto-style5"> <span class="auto-style8"><strong>$</strong></span></span>
<strong>
<input type="text" id="valor4" disabled value="0" size="23" style="font-family: Arial; font-size: 55pt; height: 75px; width: 335px;" required class="auto-style9"></strong>
<span class="auto-style7">dolares</span></div>
<p class="auto-style4"><span class="auto-style5"> tu pago total es de</span></p>
<div class="auto-style6"><span class="auto-style5"> <span class="auto-style8"><strong>$</strong></span></span>
<strong>
<input type="text" id="valor5" disabled value="0" size="23" style="font-family: Arial; font-size: 55pt; height: 75px; width: 335px;" required class="auto-style9"></strong>
<span class="auto-style7">dolares</span></div>
<br />
<br />
<a href="seleccionar_destinatario.php"><img alt height="200" src="img/button_continuar.jpg" width="850" class="auto-style3" /></a></td>
</tr>
<tr>
<td class="auto-style1" style="width: 940px; height: 45px" colspan="2"></td>
</tr>
</table>
</body>
</html>
And my JavaScript is this (also in Ghostbin ):
//funcion que se ejecuta cada vez que se añade una letra en un cuadro de texto
//suma los valores de los cuadros de texto
function sumar()
{
var dolar = 18;
var porcentaje = 100;
var valor1=verificar("valor1");
var valor2=verificar("valor2");
var valor3=verificar("valor3");
var valor4=verificar("valor4");
var valor5=verificar("valor5");
// realizamos la suma de los valores y los ponemos en la casilla del
// formulario que contiene el total
document.getElementById("valor2").value=
parseFloat(valor1);
document.getElementById("valor3").value=
parseFloat(valor1)*
parseFloat(dolar);
document.getElementById("valor4").value=
parseFloat(valor2)/porcentaje*10;
document.getElementById("valor5").value=
parseFloat(valor1)+
parseFloat(valor4)*10;
}
//funcion para verificar los valores de los cuadros de texto. si no es un valor
//numerico, cambia de color el borde del cuadro de texto
function verificar(id)
{
var obj=document.getElementById(id);
if(obj.value=="")
value="0";
else
value=obj.value;
if(validate_importe(value,1))
{
// marcamos como erroneo
obj.style.borderColor="#808080";
return value;
}else{
// marcamos como erroneo
obj.style.borderColor="#f00";
return 0;
}
}
//Funcion para validar el importe
//Tiene que recibir: El valor del importe
//Determinar si permite o no decimales
//Devuelve: true - Correcto , False - Incorrecto
function validate_importe(value,decimal)
{
if(decimal==undefined)
decimal=0;
if(decimal==1)
{
// Permite decimales tanto por . como por ,
var patron=new RegExp("^[0-9]+((,|\.)[0-9]{1,2})?$");
}else{
// Numero entero normal
var patron=new RegExp("^([0-9])*$")
}
if(value && value.search(patron)==0)
{
return true;
}
return false;
}
I have a problem that has my application stopped. I have an activity with several fragments of which I need to fire the event of one of the menu buttons, collect its data and send it to another activity to display it in the fragments for said activity.
I have five boards
How to express in relational algebra people who have not performed a concert at the Liceu? (A very nice concert hall in Barcelona).
The relational algebra is a set of operations that describe step by step how to compute an answer on the relations, as they are defined in the relational model. Called procedural, unlike Relational Calculus which is declarative.
I've brought:
But I don't know if I'm expressing those who have held a concert at the Liceu to remove them from all the Cantadors.
Also, I don't know if it is necessary to write what I wrote under the ⋈, is it enough that the SalaID column of Show is also in the Rooms?