Trouble with html form in drupal - html

Question

This is part of code I have problem with
if(user_is_logged_in())
{
$cover='<form method="post">
<input type="text" name="tekst" /><input type="submit" id="add" value="Dodaj adres okładki" />
</form></td></tr>';
}
else
{
$cover=" ";
}
$description .= '<tr><td width="60px">Title</td><td>'.$this->getTytul().'</td><td rowspan="20" width="150px">'.$cover.'</td></tr>';
and I have to run that query when user click submit button
db_query("INSERT INTO okladki_publikacji(id_publikacji,adres_okladki) VALUES(".$this->getId().",".$value_from_form.")");
but I have no idea how to do it in drupal
What I want is run function with that query on action in form but how? action =add_cover() doesnt work

Answer 1

Drupal has an amazing forms API that can help you doing this kind of stuff in a breeze.
Basically you define a form using this API and then define the function to be invoked once the user submits it and that's it. Here's an example on how to define the form:
function myformname_form($form, &$form_state){
// define the input field
$form['name'] = array(
'#type' => 'textfield',
'#title' => t('Dodaj adres okładki'),
);
// define the submit button
$form['submit'] = array(
'#type' => 'submit',
'#value' => t('Apply'),
);
return $form;
}
Then you define the function that will be executed once the form is executed. Function basically has to be named the same + "_submit" - Drupal will do the magic behind the scenes to tie it together.
function myformname_form_submit($form, &$form_state){
// and this will be where you execute the query you wanted.
}
Would recommend installing Devel module so you can inspect the form_state variable - that's where the input field value will be.
Now, you can just render the form on your code below using drupal_get_form like this:
$cover = " ";
if(user_is_logged_in()) {
$form = drupal_get_form('myformname_form');
$cover = render($form);
}
$description .= '<tr><td width="60px">Title</td><td>'.$this->getTytul().'</td><td rowspan="20" width="150px">'.$cover.'</td></tr>';
Hope this helps!