Listview errors compare help

MIT App Inventor Help
1

I need some help ....
I have 3 list views.... putting the comparison result from 2 listviews in listview 3 ...for example here t4pf00 will apear in listview 2 but it is in listview 1 so it will disappear in listview 3.....

All i want when i press on any item(code) in the comparison result it display the hours associted with it from comparison listview (listview 3)

.....

The api response
{
"Fundamental _courses": [
{
"fundamental_course_code": "W2WE00",
"fundamental_course_name": "Name1",
"Hours": 2,
"comptency1": "",
"Requirement": "M",

        "content-A3": "a3 connnt",

    },
    {
        "fundamental_course_code": "M4NS00",
        "fundamental_course_name": "hhho",
        "Hours": 2,
        "comptency1": "A",
        "Requirement": "M",

    },
    {
        "fundamental_course_code": "W9RW00",
        "fundamental_course_name": "اStable",
        "Hours": 2,
        "comptency1": "knwoldge",
        "Requirement": "O",
 
    },
    {
        "fundamental_course_code": "T4WF00",
        "fundamental_course_name": Energy",
        "Hours": 2,
        "comptency1": "manage",
        "Requirement": "O",
     
    },
    {
        "fundamental_course_code": "T4DM00",
        "fundamental_course_name": "INITAP",
        "Hours": 2,
        "comptency1": start",
 
        "Requirement": "O",
        "content-A1": "clean",
      
    },
  
],
"Optional_courses": [
    {
        "optional_course_code": "T1SM00",

        "Hours": 1,

    },
    {
        "optional_course_code": "T1YR00",

        "Hours": 2,

},
{
"optional_course_code": "T1TN00",

        "Hours": 2,


    },
    {
        "optional_course_code": "T4CM00",

        "Hours": 2,


   },
    {
        "optional_course_code": "T2PS00",

        "Hours": 2,

 
    },
   
],
"No of Required courses": 2

}

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2

This question makes no sense.

You mention T4PF00 but it never appears in the JSON you included.

So how did it get into a ListView?

3

Sorry it is just an example...you can replasce any code with requirement O like ...W9RW00 with T4PF00...ALL I WANT TO COMPARE two lists and the compared list when click on it it apears its related data like hours...

This json i writen is for example because my json is too large ..if it will help to send it i will

4

Your question is still ambiguous.

A Listview is an awful place to keep a list.

Your data collection is several lists of dictionaries, and you don't say how to match dictionaries.

Are you trying to calculate the difference between two sets of objects?

5

As said by @ABG your query is not clear.

You have 3 listviews. How do you created? With that json?
Listview 1
Listview 2
Listview 3 what are they? Will all the list view have same datas? If listview 1 contains but in listview 2 will not contain then what about listview3? Just by a single post you created so many how, what type of q's to uz. Without knowing all these it is harder to help you

6

If this your query?

Listview set up:

ListView1: Original course list (e.g., selected courses)

ListView2: Another list to compare with ListView1

ListView3: Shows the difference between ListView2 and ListView1 (i.e., items present in ListView2 but not in ListView1)

What you want?
If i m currect, When a user clicks on an item in ListView3 (which is a course code), they want to display the associated "Hours" value that comes from the comparison dataset (likely from the JSON?

Store the json in a dictionary/list

Create a dictionary:

codeToHours = create empty dictionary
for each item in ListView2Source:
    set key = item.course_code
    set value = item.Hours
    add to dictionary

Compare and populate ListView3:

for each code in ListView2:
    if code not in ListView1:
        add to ListView3

On ListView3 item click:

when ListView3 .AfterPicking:
    selectedCode = ListView3.Selection
    hours = codeToHours[selectedCode]
    call Notifier.ShowMessageDialog("Hours: " + hours)