need some tips on Drupal $form value - php

Question

I got dpm($form) working. Nice! This is much better way to view data. I am still trying to figure out where stuff is coming from eg: location longitude & latitude. The word 'longitude' is referenced in 20 different places. I thought this was a likely place to isolate text box for this input field. dpm($form['#field_info']['field_store_latitude']['location_settings']['form']['fields']);
Any tips on how to track down individual input elements?
** this is not an answer, but a supplement to my first question **
hi googletorp -
I am trying to modify existing forms using hook_form_alter.
After several hours of poking around, I can now turn off location (longitude/latitude) section of a form like this:
unset($form['field_store_latitude']);
However, turning off just the latitude like this, does not work:
unset($form['field_store_latitude']['0']['#location_settings']['form']['fields']['locpick']);
I cannot find a easy way to link id and names in html source with arrays produced by Krumo.
In this case id is called "edit-field-store-latitude-0-locpick-user-latitude".
I need a recipe or guidelines for identifying form elemets in Drupal form.
I think I nailed down a solution
<?php
// allows you to alter locations fields, which are tricky to access.
// this will require a patch in location module described here:
// http://drupal.org/node/381458#comment-1287362
/**
* Implementation of custom _element_alert() hook.
*/
function form_overrides_location_element_alter(&$element){
// change some location descriptions
$element['locpick']['user_latitude']['#description'] = ' ' . t('Use decimal notation.');
$element['locpick']['user_longitude']['#description'] = ' ' . t('See <a href=!url target=_blank>our help page</a> for more information.', array('!url' => url('latlon_help')));
// or make them disappear entirely
unset($element['locpick']['user_longitude']);
unset($element['locpick']['user_latitude']);
}
/**
* Implementation of form_alter hook.
*/
function form_overrides_form_alter(&$form, $form_state, $form_id) {
switch ($form_id) {
case 'user_profile_form':
// change titles in user profile form
$form['account']['name']['#title'] = t('Login Name');
$form['account']['mail']['#title'] = t('Email');
break;
case 'retailer_node_form':
// let's check what is supposed to be here...
print '<pre>';
//print_r($form);
dsm($form);
print '</pre>';
// this works to remove the city
unset($form['field_myvar_latitude']['0']['#location_settings']['form']['fields']['city']);
// let's try #after_build property
$form['#after_build'][]='mymodule_after_build_mynode';
break;
}
}
function mymodule_after_build_mynode($form, $form_values) {
// This will not work for locations fields
return $form;
}`enter code here`

Answer 1

So there is sneaky way to alter the location field, what you need to do is to use the #after_built callback:
/**
* Implements hook_form_alter().
*/
function mymodule_form_alter(&$form, $form_state, $form_id) {
if ($form_id == 'x_node_form') {
// alter the location field
if (isset($form['locations'])) {
$form['locations']['#after_build'][] = 'mymodule_alter_location_field';
}
}
}
/**
* Remove the delete checkbox from location element.
*/
function mymodule_alter_location_field($form_element, &$form_state) {
$location = $form_element[0]; // The location field which you can alter
return $form_element;
}