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ngIf statement is executed multiple times in Ionic 4


ngIf statement is executed multiple times in Ionic 4

By : Hend Ibrahim
Date : September 17 2020, 09:00 AM
I wish this help you
Structural directives are responsible for HTML layout. They shape or reshape the DOM's structure, typically by adding, removing, or manipulating elements.
code :


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Cursor - Declare Select-Statement executed multiple times?

Cursor - Declare Select-Statement executed multiple times?


By : Kristal Manandhar
Date : October 28 2020, 10:01 AM
I wish did fix the issue. The key is you try to read and insert the same table in loop (so it is like "a snake eating own tail"):
Cursor:
code :
DECLARE vendor_cursor CURSOR FOR 
  SELECT ID, wert
  FROM dbo.cursorcheck 
  WHERE wert = 'insert';
WHILE @@FETCH_STATUS = 0
BEGIN
    insert into dbo.cursorcheck 
    select 'Insert'

    FETCH NEXT FROM vendor_cursor 
    INTO @vendor_id, @vendor_name
END 
How many times will each print statement be executed?

How many times will each print statement be executed?


By : ravikumar kasiappan
Date : March 29 2020, 07:55 AM
may help you . Smells like homework and of course the code you pasted wouldn't even compile, but
print #1 - once print #2 & #4 - 4 times, as the block is run once on each CPU "print #" (in the for) - 40 times, if you have 40 CPUs, once on each, if you have 4, then 10 times on each
Ionic : ngIf statement inside a ngFor not working

Ionic : ngIf statement inside a ngFor not working


By : krystal
Date : March 29 2020, 07:55 AM
This might help you Your code looks ok and it should work. It looks like you have typo into ChatListArray or Incomming. Maybe Incoming?
What you can do is to use json pipe to see values of chat.status to understand what values you are iterating:
code :
<ion-grid  *ngFor="let chat of ChatListArray">
    <div>
       {{chat | json }}
    </div>
</ion-grid>
[
{"id":1},
{"number":"+..."},
{"status":"Outgoing"},
{"msg": "hello"},

{"id":2},
{"number":"+..."},
{"status":"Incoming"},
{"msg": "hello"},

{"id":3},
{"number":"+..."},
{"status":"Outgoing"},
{"msg": "hello"},
]
[
{"id":1, "number":"+...", "status":"Outgoing", "msg": "hello"},

{"id":2, "number":"+...", "status":"Incoming", "msg": "hello"},

{"id":3, "number":"+...", "status":"Outgoing", "msg": "hello"}
]
Why is the code after the if statement executed 3 times?

Why is the code after the if statement executed 3 times?


By : Dmitry Irzhov
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Your file write code is outside of the if statement you should take it inside.
how many times is the println statement executed

how many times is the println statement executed


By : JFA
Date : March 29 2020, 07:55 AM
This might help you outer loop runs i times according to value of i
1st i value is 0 last i value is 9 because i<10.
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