离子数据存储

Question

I have local storage session_storage , how can I give to variable ttt value dogovor from session_storage ?

ttt: any = this.storage.get('session_storage', 'dogovor');

Sample above is not working.

Thanks!

Answer 1

To set an item

this.storage.set('YOUR_KEY', 'YOUR_VALUE');

for eg:

this.storage.set('session_storage', 'dogovor');

To get the item

this.storage.get('YOUR_KEY').then((value) => {
  console.log(value);
});

for eg:

// declare 
private ttt = '';

// get data from storage
this.storage.get('session_storage').then((value) => {
  console.log(value);
  this.ttt = value;
});

Answer 2

There are basically two functions to store and retrieve data,

Ionic 3: @ionic/storage functions get y set

Ionic 4: @ionic-native/native-storage/ngx functions getItem y setItem

1) to store a value related to a key use,

Ionic 3 this.storage.set('key', 'value')

Ionic 4 returns a Promise

let value = null;
this.storage.set('key', 'value').then(
  () => console.log('Value stored!'),
  error => console.log(error)
);

2) to retrieve from store a value using the related key use get , this function returns a Promise , an example

Ionic 3

let value = null;
this.storage.get('key').then(
  data => value = data,
  error => console.log(error)
);

Ionic 4, similar to Ionic 3 just change function name set to setItem

Answer 3

loadCustomer(){

    return new Promise(resolve => {
      this.storage.get('session_storage').then((res)=>{
      this.anggotae = res;
      this.dogovor = this.anggotae.dogovor;
      digi: this.dogovor;
      console.log(this.dogovor);
    }); 
        let body = {
            aksi : 'getdata',
            limit : this.limit,
            start : this.start,
            dogovor: this.digi,

        };

        this.postPvdr.postData(body, 'proses-api.php').subscribe(data => {
            for(let customer of data.result){
                this.customers.push(customer);
            }
            resolve(true);
        });
    });
  }

There is an error. This is not working

let body = {
            aksi : 'getdata',
            limit : this.limit,
            start : this.start,
            dogovor: this.digi,

        };

Variable 'dogovor' is not active. Where is my mistake?