In React, the input is consistently considered 'valid'

Question

In React, the input is consistently considered 'valid'

I have a React component that looks like this

export const SearchBar = ({
  searchInput,
  updateSearchKeyword,
}: SearchBarProps) => {
  const dummy = "";
  return (
    <div className={`${styles.container} `}>
      <input
        className={`${styles["search-bar"]} `}
        type={"text"}
        value={dummy}
        title="search"
        placeholder="Search..."
        onChange={(e) => updateSearchKeyword(e.target.value)}
      />      
    </div>
  );
};

Now, I want to apply CSS changes when the input field has text. My CSS code is as follows

.search-bar:valid {
  color: red;
}

But the color is always red, meaning the input is always considered 'valid'

I have tried

.search-bar[type="text"]:valid {
  color: red;
}

and also added a pattern in the component, but the issue persists. How can I resolve this?

Note: I am using modules.css, so the class names may appear unusual, but they are functioning correctly for other properties.

css reactjs

Answer 1

Answer №1

When it comes to styling your components, remember that simply declaring a class name will not update the style dynamically. If you want to change the color of an input based on certain conditions, you'll need to utilize state and event handling.

For instance, instead of just assigning an empty string to the value of an input, you should use useState to manage the value dynamically:

const [inputValue, setInputValue] = useState('');

Then, you can update the input value and handle style changes like this:

value={inputValue}
onChange={(e) => setInputValue(e.target.value)}

To change the style based on the input value, you can define a handleChange function that updates the state and checks for conditions:

const handleChange = (value) => {
  setInputValue(value);

  if (value !== '') {
    // Change the style of the input (e.g. color)
  }
}

Instead of manually manipulating the DOM, consider using state to manage styles:

const [inputStyle, setInputStyle] = useState(`${styles["search-bar"]}`);

Then, you can update the style by setting the state:

setInputStyle(`${styles["search-bar-blue"]}`);

Additionally, for validation, you can define a CSS pattern to enforce specific criteria:

<input pattern="[a-z]+" type.../>

This pattern will only validate true if the input consists of lowercase letters only.

Answer 2

When it comes to styling your components, remember that simply declaring a class name will not update the style dynamically. If you want to change the color of an input based on certain conditions, you'll need to utilize state and event handling.

For instance, instead of just assigning an empty string to the value of an input, you should use useState to manage the value dynamically:

const [inputValue, setInputValue] = useState('');

Then, you can update the input value and handle style changes like this:

value={inputValue}
onChange={(e) => setInputValue(e.target.value)}

To change the style based on the input value, you can define a handleChange function that updates the state and checks for conditions:

const handleChange = (value) => {
  setInputValue(value);

  if (value !== '') {
    // Change the style of the input (e.g. color)
  }
}

Instead of manually manipulating the DOM, consider using state to manage styles:

const [inputStyle, setInputStyle] = useState(`${styles["search-bar"]}`);

Then, you can update the style by setting the state:

setInputStyle(`${styles["search-bar-blue"]}`);

Additionally, for validation, you can define a CSS pattern to enforce specific criteria:

<input pattern="[a-z]+" type.../>

This pattern will only validate true if the input consists of lowercase letters only.

In React, the input is consistently considered 'valid'

Answer №1

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