Using Observables in Ionic 3 and Angular 5

@sambhupal wrote:

Hi, I’m new in ionic 3,

1. I can save sqlite data save to server database by using API (http).
2. I have 4 data in my sqlite local storage.
3. Following function: for each data is saved to server database successfully…
   a) after success i got a response from server.
   b) And according success message i run another function for delete single data(delete each data)
   c) But what I am seeing only no. 4 data is delete other remain same.

Here is my code:

synch(){

this.sqlite.create ({ name: “m_ilsapps.db”, location: “default” })
.then((db: SQLiteObject) => {
db.executeSql(“SELECT * FROM m_offline_pod_data ORDER BY m_offline_id ASC”, ).then((data) => {
if(data.rows.length > 0) {
for(var i = 0; i < data.rows.length; i++) {

    this.productInfo.m_offline_id = data.rows.item(i).m_offline_id;
    this.productInfo.m_pod_no = data.rows.item(i).m_pod_no;

this.http.post(“http://example.in/clix_mobile_apps/add-product-offline.php”,this.productInfo).subscribe( data => {
console.log( "SUCCESS => " + data);

let offlineupdate = JSON.parse(data["_body"]);

  if(offlineupdate.status == "success"){

this.MYdeleteData(this.productInfo.m_offline_id);

  }  else if(offlineupdate.status == "podnotmatch"){

 this.toast.show("POD MISMATCH...try again...", '5000', 'center').subscribe(
      toast => {
      console.log(toast);
      }
    );

  }

}, err=>{
  console.log("Error => "+ err);

    this.toast.show("NO SERVER RESPONSE...try again...", '5000', 'center').subscribe(
      toast => {
      console.log(toast);
      }
    );

});
}  // for each end
                       }
    console.log(this.products);
}, (error) => {
    console.log("ERROR: " + JSON.stringify(error));
             });
})

}

// delete function

MYdeleteData(myID){
alert(‘DELETE’+myID);
this.sqlite.create ({ name: “m_ilsapps.db”, location: “default” })
.then((db: SQLiteObject) => {
db.executeSql(“DELETE FROM m_offline_pod_data WHERE m_offline_id = '”+myID+"’", ).then((data) => {

 console.log(this.products);

}, (error) => {
  //alert('delete error v3-10012')
    console.log("ERROR: " + JSON.stringify(error));
  });

})
}

Please help me

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