Module development and code questions

Hello, My name is Eko Poerwanto, newbie in Drupal 8. Now, i create e-commerce with Drupal 8. 

I have some problem, how to add field Phone Number in checkout pane, for New Customer.

i use this module to build : https://www.drupal.org/project/commerce

many thank's for any help

Hello,

I have a module that produce a page with a tpl.php containing a script. This script depends on socket.io.js, and this file is declared at the beginning of the page.

I'd like to change the organisation of the module to have the script executed from a js file.

Hi,

I want to use the same form twice in a page but when I submit one form, I see errors on the second too...

I used two different $form_id :

$html[] = drupal_get_form('distribution_form_aap_evaluation_' . $id_one, array('did' => $no, 'rapporteur' => $rapporteur_1));

$html[] = drupal_get_form('distribution_form_aap_evaluation_' . $id_two, array('did' => $no, 'rapporteur' => $rapporteur_2));

I use hook_forms() to use the same form callback "distribution_form_aap_evaluation":

Hey 

I am adding a back to top button using back to top module of druple 8. I want to customize this button according to my site. Can anyone tell me in which file should I customize it according to what I need. It will be really helpful.

My customer has an entity called 'doctor' that has many fields and has several views depending on which audience. Display Suites would seem to be able to create a custom view mode where she can move the fields around as needed for each view mode. The problem is how to programmatically change the view_mode. 

I am no Coder at all but i have a problem with a custom module on our website the developer of witch is no longer around.

This blok wil add a button that links to a webform and passes these variables: 

https://www.mirtos.nu/adoptieformulier?naam=Zoe&dier=kat

It stopped passing the variable "dier"