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React.js: How to prevent wasted renders when inserting a new form field on the page

I have a form with a couple of conditionally rendered fields. The form is made up of MUI components, react-hook-form and yup for its validation.

Additionally, I have added a console.log() within the AutocompleteCoffee, RadioBtnGroup, TxtField components that will execute every time the components are rendered.

Scenario

When the page loads you can see a log from each component. Nothing new here.

When you select "Yes" from, Do you like coffee? a new field will be rendered. This action triggers a rerender of all the components on the page.

I am using the watch method from react-hook-form to keep track of the question mentioned above.

const coffee = watch("coffee", "No");
...
{coffee === "Yes" ? (
          <AutocompleteCoffee
            required
            fullWidth
            name="coffeType"
            label="Which coffee type"
            control={control}
            options={coffeList}
            error={!!errors.coffeType}
            helperText={errors?.coffeType?.message}
          />
        ) : null}
...

You can see the working CodeSandbox here.

Question

I was wondering how to prevent all the wasted renders. Any ideas?

Thank you in advance!

Via Active questions tagged javascript - Stack Overflow https://ift.tt/pNBYJOw

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