typescript json array hardcoding

Question

Hi everybody I'm trying to convert a jquery app to Ionic. I used an array of json object to switch from a set of value to others on UI change event. This is part of the table I used

var table = {};
    table['0']  = {stipendio:716.73,base:531.52,ivmg:185.21,f025:7.21,f2650:14.42,f5170:21.63,f71:28.84};
    table['1']  = {stipendio:716.73,base:531.52,ivmg:185.21,f025:7.21,f2650:14.42,f5170:21.63,f71:28.84};
    table['2']  = {stipendio:899.44,base:638.39,ivmg:261.05,f025:8.08,f2650:16.16,f5170:24.24,f71:32.32};
...
...

and then I used a selector to choose which one of the row to use:

selected = $("#seniority").val()
paramsToUse = table[selected];

So I could use paramsToUse as a json object to get the value I needed.

How can I get the same result with Typescript?

I think your code is also valid typescript code as long as your have imported $. — aristotll
– aristotll, Commented Jul 29, 2017 at 14:53
@aristotll the actual explanation is quite complicated and cannot be expressed in a comment. Basically the way typescript handles interop imports is fundamentally broken. They're planning to fix it but it will take a long long time — Aluan Haddad
– Aluan Haddad, Commented Jul 29, 2017 at 15:14
@aristotll see github.com/Microsoft/TypeScript/issues/16093 for more information — Aluan Haddad
– Aluan Haddad, Commented Jul 29, 2017 at 15:20

Lucas Moulin · Accepted Answer · 2017-07-29 15:15:58Z

1

You can use Ionic's select to choose a table:

// On your .html file
<ion-list>
  <ion-item>
    <ion-label>Table</ion-label>
    <ion-select [(ngModel)]="tablePosition" (ngModelChange)="selectTable()">
      <ion-option value="0">First</ion-option>
      <ion-option value="1">Second</ion-option>
      <ion-option value="2">Third</ion-option>
    </ion-select>
  </ion-item> 
</ion-list>

// On your .ts file
private table: object[];
private paramsToUse: object;
private tablePosition: number;

private selectTable() {
  this.paramsToUse = table[this.tablePosition];
}

Assuming that your table could be an array of objects

edited Jul 29, 2017 at 15:15

answered Jul 29, 2017 at 15:08

Lucas Moulin

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4 Comments

Michael Fedora Over a year ago

It looks like an array, i.e. ['0'] and ['1'], etc (wonder why he's not using [val, val2, val3, ...]). Otherwise he could have an array of keys to use with the object and use that in combination with *ngFor. Though, can *ngFor iterate by object keys as well?

Nik Rubblers Over a year ago

thank you guys, but the question is not on the component to use. I can't find the way to translate the javascript array of json I posted up here into Typescript.

Michael Fedora Over a year ago

Hey @NikRubblers , all Javascript is good typescript, so you should be fine. Another way to do it would be something like this: myArray = [ val1, val2, val3 ], or in your case table = [ {...}, {...}, {...} ]. In Ionic, if you used something like that array, you could then use *NgFor. If you want more on that I can write up an answer.

Nik Rubblers Over a year ago

whatever sintax I use in Typescript it gives me errors. I need ad array of json {key:value,key:value,key:value,...} objects but I can't find the way to get it

Michael Fedora · Accepted Answer · 2017-07-29 15:45:46Z

In your comment you wanted to know how to create an array instead of using the table (sudo-array) you did in your answer, but I'll also show you how to easily extend it with NgFor.

Your table looks like this:

var table = {};
table['0']  = {stipendio:716.73,base:531.52,ivmg:185.21,f025:7.21,f2650:14.42,f5170:21.63,f71:28.84};
table['1']  = {stipendio:716.73,base:531.52,ivmg:185.21,f025:7.21,f2650:14.42,f5170:21.63,f71:28.84};
table['2']  = {stipendio:899.44,base:638.39,ivmg:261.05,f025:8.08,f2650:16.16,f5170:24.24,f71:32.32};

In Typescript, the more optimal version would look more akin to this:

// let is better than var because scoping issues
let table = [
  // You can put objects directly into arrays, like this. It automatically assigns indexes
  // so if you need to manually assign them it will be more complicated.
  {stipendio:716.73,base:531.52,ivmg:185.21,f025:7.21,f2650:14.42,f5170:21.63,f71:28.84},
  {stipendio:716.73,base:531.52,ivmg:185.21,f025:7.21,f2650:14.42,f5170:21.63,f71:28.84},
  {stipendio:899.44,base:638.39,ivmg:261.05,f025:8.08,f2650:16.16,f5170:24.24,f71:32.32},
  // ...etc
];

If you are using it on a Component, though, I would assume you'd use this.table instead of let table, but I don't know the rest of your code.

Later, in your code, you can use the wonderful NgFor to use your select (taken from @akz92 's answer)

<ion-list>
  <ion-item>
    <ion-label>Table</ion-label>
    <ion-select [(ngModel)]="tablePosition" (ngModelChange)="selectTable()">
      <ion-option *ngFor="let value of table; i = index" [value]="i">{{value.stipendio}}</ion-option>
    </ion-select>
  </ion-item> 
</ion-list>

Nik Rubblers · Accepted Answer · 2017-07-29 15:40:43Z

0

Ok guys thank you everybody.

I've got it working using

table = [
{stipendio:716.73,base:531.52,ivmg:185.21,f025:7.21,f2650:14.42,f5170:21.63,f71:28.84},
{stipendio:716.73,base:531.52,ivmg:185.21,f025:7.21,f2650:14.42,f5170:21.63,f71:28.84},
{stipendio:716.73,base:531.52,ivmg:185.21,f025:7.21,f2650:14.42,f5170:21.63,f71:28.84}
]

much easier than I thought.

Thank again everybody

answered Jul 29, 2017 at 15:40

Nik Rubblers

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2 Comments

Michael Fedora Over a year ago

Just so you know, this is also standard in Javascript as well, not just Typescript :)

Nik Rubblers Over a year ago

yes this is! the syntax I used before wasn't though! ;)

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