POST an array from an HTML form without javascript

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I have a form that is a little complex and I am hoping to simplify the server-side (PHP) processing by natively POSTing an array of tuples.

The first part of the form represents a User:

First Name
Last Name
Email
Address
etc

The second part of the form represents a Tree:

Fruit
Height
etc

The problem is that I need to be able to POST multiple Trees for a single User in the same form. I would like to send the information as a single User with an array of Trees but this might be too complex to do with a form. The only thing that comes to mind is using javascript to create some JSON message with a User object and an array of Tree objects. But it would be nice to avoid javascript to support more users (some people have scripts turned off).

Answers

check this one out.

<input type="text" name="firstname">
<input type="text" name="lastname">
<input type="text" name="email">
<input type="text" name="address">

<input type="text" name="tree[tree1][fruit]">
<input type="text" name="tree[tree1][height]">

<input type="text" name="tree[tree2][fruit]">
<input type="text" name="tree[tree2][height]">

<input type="text" name="tree[tree3][fruit]">
<input type="text" name="tree[tree3][height]">

it should end up like this in the $_POST[] array (PHP format for easy visualization)

$_POST[] = array(
    'firstname'=>'value',
    'lastname'=>'value',
    'email'=>'value',
    'address'=>'value',
    'tree' => array(
        'tree1'=>array(
            'fruit'=>'value',
            'height'=>'value'
        ),
        'tree2'=>array(
            'fruit'=>'value',
            'height'=>'value'
        ),
        'tree3'=>array(
            'fruit'=>'value',
            'height'=>'value'
        )
    )
)

Friday, December 16, 2022

chris_herrera-d658f2a3a6de

The good news is that PHP and JavaScript have a similar idea about what values are true and false.

An empty string will be false on both sides. A string with something in it (except 0 in PHP) will be true on both sides.
The number 0 will be false on both sides. All other numbers will be true on both sides.

Since the values of a form will always be strings, as Quentin pointed out in his answer, a good practice might be to use an empty string as false value and something else (e.g. 'true') as true value. But I think your way of using 0 and 1 and testing the numerical values is the safest approach because it isn't misleading. (When someone sees 'true' they might think 'false' would also be usable for a false value.

Saturday, August 20, 2022

yuri_astrakhan

This code is working. You need to add some condition, that checks, if $username is posted or not.

Something like that:

if(count($_POST)){
    $username ='';
    if(isset($_POST['user'])){
        $username = $_POST['user'];
    if ($username==null || !$username)
         echo 'username is null';
     echo strlen($username);
     echo $username;
   }

 }

Thursday, August 18, 2022

adnaan

You can create form fields with array notation, for example:

<input type="text" name="quantity[productid]">

So you could dynamically generate some fields in your form like this:

<input type="text" name="quantity[3]">
<input type="text" name="quantity[4]">
<input type="text" name="quantity[2]">

And then in PHP it will become an array you can loop over easily:

foreach ($_POST['quantity'] as $productId => $quantity) {
    echo (int) $productId . ':' . (int) $quantity;
    //etc.
}

Sunday, August 21, 2022

kmario23

Do this.

If your element is something like this..

<input type="text" id="mytext"/>

Your script would be

<script>
function setFocusToTextBox(){
    document.getElementById("mytext").focus();
}
</script>

Thursday, August 4, 2022

ameya_deshpande

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POST an array from an HTML form without javascript

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