Hello,
I try to do something with the contacts tutorial. now is my question. I can access all my contacts and receive the complete contacts list from my phone. i show the contacts with a name, phonenumber and email adress. But some contacts dont have a email address or phonenumber or no name. How do i remove this labels from the list when the list ist loaded? here is a screenshot 
thanks a lot
Hello Gosse,
Unfortunately custom app logic is outside the scope of our support, but we can suggest you the main idea:
1) make the label invisible
2) read its value with js
3) if the value isn't equal to null make this label visible.
Hello Evgene,
Thanks for your reply.
I am new to programming but i found out this.
i used this javascript
Apperyio("contactName").hide();
if (contactName.val === "") {
}
for the contactName label that works but if i use it for the phoneNumber label and email label i still get a response Null how is this working? i noticed tha if i don't use this code for the conactName label i get an empty field
For the phoneNumber label i used this code
Apperyio("phoneNumber").hide();
if (phoneNumber.val === "null") {
}
and for the email label this code
Apperyio("email").hide();
if (email.val === "null") {
}
probably it's a logical explanation but i don't know where to search 
Hello Gosse,
Please add to the mapping field which could be empty this JS:
preif (!value){
element.parents("tr").hide();
}/pre