Looping item based on the value of array inside a angular html loop

Question

So I have this weird problem (or might just say my logical problem) on how do I loop an item inside angular html, instead of the value of array must be access something like 0 - 1 - 2 by (keys) it doing something like this 2 - 0 - 1

I will just attach stackblitz example here , I dont know why it occurs like this but something is not right. I might thinking it wrong

Can you provide some more details on how your example is not working? I opened your example, and all the numbers appear to be in order. — Bernie
– Bernie, Commented Nov 8, 2018 at 1:20
in the example the one (word) must have a count of 0 , 1 , 2 instead of 0 , 1 , 2 , 3 ,4 since the function getData() will get the index of the object array and point the value of the array based on the index of the object and push some numbers to arrayCbox to get the length and will reflect to html. Partially the output from the html is wrong because index 0 of the array must be 3, so the output must be from 0, 2 not from 0,4 — nyx97
– nyx97, Commented Nov 8, 2018 at 1:25
I'm having a ton of trouble understanding your example because getData is super weird. It changes a component variable on the go for every call, and that in turn probably breaks the nested ngFor. What did you expect to be printed on the screen? I would recommend you avoid at all costs functions with side effects being called from the HTML. You're just inviting trouble and complications to your program. — Badashi
– Badashi, Commented Nov 8, 2018 at 1:27
@Badashi so the expected output must be something like this one below numbers are 012 , two below numbers 0,1,2,3 , three below numbers 0,1,2,3,4 something like this. "I would recommend you avoid at all costs functions with side effects being called from the HTML" I will take note for this. but for my case do I need it or there is some method like (loop) that will take a number and loop it depends on the number of object value — nyx97
– nyx97, Commented Nov 8, 2018 at 1:32
The main issue here is that you have a arrayCbox variable that is, in a sense, global to your component. However, every call to getData will alter that arrayCbox - and there's no way to guarantee that you'll have the correct arrayCbox for each inner loop of your ngFors. Instead, you should have some way to build your arrayCbox for each different element of someObjectArray. Maybe if you show us what problem you are trying to solve, we can figure out a different way to approach it. — Badashi
– Badashi, Commented Nov 8, 2018 at 1:42

nyx97 · Accepted Answer · 2018-11-08 02:15:59Z

1

I just solved my problem instead doing that complicated thingy i did this

in HTML

        <ion-item *ngFor="let item of checkNumReq(arraySentences[ind]); let in = index;">
          {{index}}
        </ion-item>

in TS file

  checkNumReq(num_req:any){
    return new Array(num_req);
  }

answered Nov 8, 2018 at 2:15

nyx97

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