Previous Value was empty

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#1

Good morning every one.(I need help)
When I try to append value to firebase data base it show alert that …Previous value was empty… Can any one tell me the problem and by the way I connect the get value with list view and data change …and this is the componnt

Screenshot_20230125_105945_com.android.chrome
Screenshot_20230125_105945_com.android.chrome720×1560 155 KB

Excause my english.and thank every one

#2

Hi. There are many ways to do it.

  • You can save the list with a control item that you have to delete after
  • You can call the value and test if it’s empty and then chose to save a value or add a value (with an " if then else" control
  • you can use a variable to know if it’s the first start or not
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#3

Thank you very much, but unfortuntely Iam new in kodular so if you dont mind show me the componnts please, and thank you again.

#4

The block “append” works only if you already have a list in your firebase . Why you haven’t any value ? You have to create a record ? How you want to save data?
You have to read something more about firebase block and how they work :sweat_smile:

#5

Often the solution is just ready, you have to search better in the community :+1:t2: here there is also a solution about append problem :wave:t2:

#6

You solved ?

#7
#8

Yyes very thank you and all of members but I need a code for (move to) form visible arreinment to unvisible arreinment …

#9

Hi , mark as solved in the right message.
To move from visible arrangement to unvisible is very easy , just use the set visible to true or false with the arrangment blocks. You can set it with a button or a clock or as you want according to your project.
blocks (1)

You have to use two of them together ,one to set visible and one to hide the 2 arrangment

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#10

No no no man I dont mean that I know that, but I mean that if I need to move item form listview 1 in arreinment 1 to listview 2in arreinment 2 and all of those arreinment in the same screen.how I can do that,thank you.

#11

To move items between listview you have to work with variable . Move items between variable list and then load the list in the right listview.

#12

Create one HA with full width
Add two VA with with 50% each

In VA1 add Listview1
In VA1 add Listview2

And adjust remaining blocks

#13

:sweat_smile: you have to mark the solution so other user find it fast . The message with the solution