a guide to transforming data into a string with json using angular

Question

a guide to transforming data into a string with json using angular

I am struggling to figure out how to bind my form data into a JSON string. My situation involves using a string field in the database and saving checkbox values in a single database column using JSON. I have created an HTML form, but I am unsure of how to bind all the data in the database. If anyone has experience with this, please guide me.

documentList: [
          {
            'IsSpecifications': false,
            'IsSpecificationscomment': ''
          },
          {
            'IsDrawSchedule': false,
            'IsDrawSchedulecomment': ''
          },
          ...
        ];

<div class="my-3">
                        <ejs-checkbox label="isSpecifications()" labelPosition="Before"></ejs-checkbox>
                    </div>
                   ...
                    </div>

Within the database, I utilize the documentlist field where all checkbox values are stored as a JSON string.

json angular typescript angular-forms angular-json

Answer 1

Answer №1

It seems like what you're looking for is JSON.parse()

To learn more, check out the documentation at: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse?retiredLocale=it

Answer 2

It seems like what you're looking for is JSON.parse()

To learn more, check out the documentation at: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse?retiredLocale=it

Answer 3

Answer №2

Check out the Stackblitz for this code snippet

This answer serves to provide a demonstration on Stackblitz rather than a tutorial.

To fully comprehend the code, you need to have a grasp of the following:

Angular Reactive Forms (form group, form array etc.) - refer to https://angular.io/guide/reactive-forms
Some RxJS (delay, takeUntil(this.destroyed$) etc.) - check out https://angular.io/guide/rx-library
Control Value Accessor (writeValue etc.) - see this SO answer or https://www.youtube.com/watch?v=kVbLSN0AW-Y

Instead of using Control Value Accessor, you can also pass in a form group as an input based on your preference.

A Brief Overview

By implementing the control value accessor on a custom component like ejs-checkbox, you can easily bind it using the code snippet below:

<ejs-checkbox formControlName="{{ i }}"></ejs-checkbox>

Any changes made will be automatically reflected in the overall form group.

Try modifying the form and observe the console logs displaying valueChanges.

I've opted for a form array for the document list to accommodate potential size changes. However, if size is fixed, consider using form controls instead.

Included is an exampleSave() function that converts the form group value to match your documentList. You can JSON.stringify this data and send it to the server as stated in your question.

Answer 4

Check out the Stackblitz for this code snippet

This answer serves to provide a demonstration on Stackblitz rather than a tutorial.

To fully comprehend the code, you need to have a grasp of the following:

Angular Reactive Forms (form group, form array etc.) - refer to https://angular.io/guide/reactive-forms
Some RxJS (delay, takeUntil(this.destroyed$) etc.) - check out https://angular.io/guide/rx-library
Control Value Accessor (writeValue etc.) - see this SO answer or https://www.youtube.com/watch?v=kVbLSN0AW-Y

Instead of using Control Value Accessor, you can also pass in a form group as an input based on your preference.

A Brief Overview

By implementing the control value accessor on a custom component like ejs-checkbox, you can easily bind it using the code snippet below:

<ejs-checkbox formControlName="{{ i }}"></ejs-checkbox>

Any changes made will be automatically reflected in the overall form group.

Try modifying the form and observe the console logs displaying valueChanges.

I've opted for a form array for the document list to accommodate potential size changes. However, if size is fixed, consider using form controls instead.

Included is an exampleSave() function that converts the form group value to match your documentList. You can JSON.stringify this data and send it to the server as stated in your question.

a guide to transforming data into a string with json using angular

Answer №1

Answer №2

Check out the Stackblitz for this code snippet

A Brief Overview

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