dynamically adding text boxes in drupal form api - api

Question

I want to have a add more button on clicking which i can add dynamically, textboxes in a drupal form api.. can someone help on this?
Thanks in advance

Answer 1

Take a look at Adding dynamic form elements using AHAH. It is a good guide to learn AHAH with Drupal's form API.
EDIT: For an example, install the Examples for Developers module, it has an AHAH example you can use to help you learn.

Answer 2

Here is an example how to solve this with Ajax in Drupal 7(If anyone want I can convert it also to Drupal 6 using AHAH(name before it became Ajax)).
<?php
function text_boxes_form($form, &$form_state)
{
$number = 0;
$addTextbox = false;
$form['text_lists'] = array
(
'#tree' => true,
'#theme' => 'my_list_theme',
'#prefix' => '<div id="wrapper">',
'#suffix' => '</div>',
);
if (array_key_exists('triggering_element', $form_state) &&
array_key_exists('#name', $form_state['triggering_element']) &&
$form_state['triggering_element']['#name'] == 'Add'
) {
$addTextbox = true;
}
if (array_key_exists('values', $form_state) && array_key_exists('text_lists', $form_state['values']))
{
foreach ($form_state['values']['text_lists'] as $element) {
$form['text_lists'][$number]['text'] = array(
'#type' => 'textfield',
);
$number++;
}
}
if ($addTextbox) {
$form['text_lists'][$number]['text'] = array(
'#type' => 'textfield',
);
}
$form['add_button'] = array(
'#type' => 'button',
'#name' => 'Add',
'#ajax' => array(
'callback' => 'ajax_add_textbox_callback',
'wrapper' => 'wrapper',
'method' => 'replace',
'effect' => 'fade',
),
'#value' => t('Add'),
);
return $form;
}
function ajax_add_textbox_callback($form, $form_state)
{
return $form['text_lists'];
}
function text_boxes_menu()
{
$items = array();
$items['text_boxes'] = array(
'title' => 'Text Boxes',
'description' => 'Text Boxes',
'page callback' => 'drupal_get_form',
'page arguments' => array('text_boxes_form'),
'access callback' => array(TRUE),
'type' => MENU_CALLBACK,
);
return $items;
}