Automatically save form controls with formControlName in Nativescript

Question

Automatically save form controls with formControlName in Nativescript

I have placed a TextField in my .html file

<TextField class="textfield" row="0" col="1" formControlName="powersupplyid" [text]='myipdevice'> </TextField>

I am looking for a way to automatically save the value when 'myipdevice' is displayed on the screen.

getform() {
    ..........
     .....
        this.myipdevice = myipfind;
        console.log('Value found', this.myipdevice)
        let LS = require("nativescript-localstorage");
        LS.setItem(this.myipdevice);
    }

Does anyone have an idea on how to automatically save the value of myipdevice when it is shown in the html?

Thank you!

angular typescript nativescript autosave

Answer 1

Answer №1

The information is already stored in your form object under the name you assigned to it. For example, if you named it "form"

After that,

this.form.controls.powersupplyid.value

will be automatically updated with any input or action taken within the textarea.

Answer 2

The information is already stored in your form object under the name you assigned to it. For example, if you named it "form"

After that,

this.form.controls.powersupplyid.value

will be automatically updated with any input or action taken within the textarea.

Answer 3

Answer №2

Currently, you seem to be handling two tasks simultaneously. One one hand, you are associating the TextField with a reactive form field using formControlName, while on the other hand, you are also linking the [text] property. It is recommended to stick to using only formControlName.

In your component, after retrieving the value, you can update the control's value accordingly. (Assuming certain details since the full code was not provided.)

For instance, in the ngOnInit method in the example, you can fetch the stored value and then use patchValue to reflect this change in the view.

Moreover, you can monitor changes to the control by subscribing to valueChanges.

export class IpDeviceFormComponent implements OnInit {

  form: this.fb.group({
    powersupplyid: [''] // FormControl bound to TextField
  });

  constructor(private fb: FormBuilder) { }

  ngOnInit() {
    // retrieve a previously saved value
    getSavedPowerSupplyId().subscribe(id => {
      this.form.patchValue({
        powersupplyid: id
      });
    });

    // listen for form changes
    this.form.valueChanges.subscribe(form => { /* Save new form state */ });
  }
}

Answer 4

Currently, you seem to be handling two tasks simultaneously. One one hand, you are associating the TextField with a reactive form field using formControlName, while on the other hand, you are also linking the [text] property. It is recommended to stick to using only formControlName.

In your component, after retrieving the value, you can update the control's value accordingly. (Assuming certain details since the full code was not provided.)

For instance, in the ngOnInit method in the example, you can fetch the stored value and then use patchValue to reflect this change in the view.

Moreover, you can monitor changes to the control by subscribing to valueChanges.

export class IpDeviceFormComponent implements OnInit {

  form: this.fb.group({
    powersupplyid: [''] // FormControl bound to TextField
  });

  constructor(private fb: FormBuilder) { }

  ngOnInit() {
    // retrieve a previously saved value
    getSavedPowerSupplyId().subscribe(id => {
      this.form.patchValue({
        powersupplyid: id
      });
    });

    // listen for form changes
    this.form.valueChanges.subscribe(form => { /* Save new form state */ });
  }
}

Automatically save form controls with formControlName in Nativescript

Answer №1

Answer №2

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