CODEWITHSUNDEEP
phphtmlforms
diegoaguilar
diegoaguilar

Reputation: 8376

HTML form with checkbox and number types submission with PHP?

For learning purposes, I'm doing this website where user can select some items and the number of units he wants, let's say it's this simplest shopping app.

So, I read from database the existing items in catalog:

$queryResult=$mySQL->query("SELECT nombre, precio, id FROM productos");

Then I print the list of products:

    $queryResult=$mySQL->query("SELECT nombre, precio, id_producto FROM productos");
    echo "<form action=\"checkout.php\" method=\"POST\">";
    while($datos=$mySQL->fetch_array($queryResult))
    {   
        $nombre=$datos['nombre'];
        $id_producto=$datos['id_producto'];
        $precio=$datos['precio'];

        echo "<h1>$nombre</h1>";
        echo "<input type=\"checkbox\" name=\"$id_producto\" value=\"on\"> Cantidad: <input type=\"number\" name=\"$id_producto"."Number\""." min=\"1\" max=\"20\" step=\"1\" value=\"1\"><br>";
        echo "<h3>Precio: $precio</h3><br>";

    }

    echo "<br>";
    echo "<input type=\"submit\" class=\"button\" value=\"Comprar\">";
    echo "</form>";

They get as value the ones from $id_producto, in the case of the number type inputs I concatenate "Number" so they dont get the same name.

After submission, I'm trying to do something like:

foreach($_POST as $post_key => $post_value){     

    if ($post_value=="on") {
        $var1 = $_POST['.$post_key."Number".'];
    }
}

So if a checkbox was selected I check for its corresponding numeric value.

Is it OK to perform another $_POST['somevariable'] inside that loop?
How can I concatenate that argument inside the square brackets?

Upvotes: 0

Views: 111

Answers (1)

Barmar
Barmar

Reputation: 780787

You don't need the single quotes, that's for when the key is a constant string. Since your key is an expression, just put that expression inside the brackets:

if ($post_value=="on") {
    $var1 = $_POST[$post_key."Number"];
}

A better way to do this is to post the inputs as arrays:

echo "<input type=\"checkbox\" name=\"producto[]\" value=\"$id_producto\"> Cantidad: <input type=\"number\" name=\"Number[$id_producto]\" min=\"1\" max=\"20\" step=\"1\" value=\"1\"><br>";

Then you can use the loop:

foreach ($_POST['producto'] as $post_value) {
    $var1 = $_POST['Number'][$post_value];
}

Upvotes: 1

Related Questions