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Get to know what HTML-button is clicked with PHP, no Name of value available

Answer 1

A:

If you provide some code, it's probably easier to see your problem.

Anyway, when you can't use or change the name for the inputs, you can always give each of them a unique id, and use that. If that is also a problem you could store some arbitrary data in the class attribute.

Jasper De Bruijn 2010-06-16 08:47:21

Code is added. Thx

koko 2010-06-16 09:02:17

That might be a solution! How can I get the ID of the button with PHP?

koko 2010-06-16 09:46:44

Answer 2

+1 A:

I can't exactly figure out what your problem is but it looks like you could enhance the whole process with some AJAX/JavaScript functionallity.

When you click the button that is supposed to determine if you need additional fields, you can send an AJAX call to a server-side script and the answer from this script can trigger a function that will add whatever you need to the form, including proper names that either follow certain rules (like name_1, name_2, ..., name_n) or can be calculated from the server-side script and send back to your form.

DrColossos 2010-06-16 08:56:18

I really need a full page-reload... I've added some code, so you can (hopefully) see what I mean ;-)

koko 2010-06-16 09:02:56

If you want a full page reload when you add a new collection of forms just add a hidden field to the "voeg extra items toe" button and wrap them around an <form> for each element. Or use a <form> around the whole site and determine the clicked button based on their name="youritem" that will be send to the server.

DrColossos 2010-06-16 09:13:06

This can work ... Only when I put the form around each group of items and push the add button, I won't be able to save the items I've inserted. Just the items within the group I've posted.

koko 2010-06-16 11:39:30

Then I would go with a form around the whole <table>/<whatever-you-are-using> and determine the clicked button based on it's name that is sent. So instead of "name="list_list:add" you could do "name=add_drinken"

DrColossos 2010-06-16 11:56:33

Answer 3

A:

For tricky scenarios where you're adding new rows, but want specific names I use this convention "btn_name_1", "btn_name_2" etc. When your form has been posted you can split apart the field/button name using regex or substr (or similar) in PHP and find which button was clicked ("btn_name"), and in which row ("1"). This way each input field can have it's own unique name while still keeping it's function and purpose clear.

Here's some PHP which will help with splitting up names and numbers on buttons/fields using the above naming scheme...

// Loop through POST Variables
foreach ($_POST as $key => $value) {    
  if (substr($key, 0, 8) == 'btn_name') {
    // "btn_name" was clicked, which ID?
    $id = (int)substr($key, 8);
  }
}

EDIT: After seeing your code it all makes sense! Just name your fields like this "eat_name_1", "eat_number_1" (for row one), "eat_name_2", "eat_number_2" (for row two) etc. And for the other items try "drink_name_1", "drink_number_1" (row one), "drink_name_2", "drink_number_2" (row two) etc. Use the PHP code above to split all the random fields into name/value pairs. Adding new rows is easy, just increment the number on the end.

Wireblue 2010-06-16 09:11:49

Ok, I now how to add extra fields, but how can I know that button is clicked while I can't give the different names (I do a select on the button name clicked to know what action happened), so I know where to add those extra fields? Thx!

koko 2010-06-16 09:24:35

So just to clarify, you can't change the name attribute on the button but you want to know which of the buttons changed? Does the button have any name attribute set?

Wireblue 2010-06-16 10:28:11

No indeed, the name can't be changed and is allready set (see code: list_list:add ).

koko 2010-06-16 11:04:46

Ok, that's fine. Try changing the value for each button to "Add Additional Items to Eat", "Add Additional Items to Drink" etc, so that each button has it's own unique value. Then when your form is submitted, check the value of $_POST['list_list:add']. This will tell you which button was clicked.

Wireblue 2010-06-16 11:15:14

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Get to know what HTML-button is clicked with PHP, no Name of value available

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