How can I style an empty input text field with CSS?

Imagine a scenario where a form is initially loaded with an <input type="text"> that has a vibrant green background. What would be interesting is if, once the user starts entering a value, the color changes to blue.

The big question is: Can we achieve this effect using just CSS? Some might suggest using the input[type='text'][value] selector. However, it doesn't quite capture any alterations made by the user in the form post-loading. So, if the form loads without a value, it will stubbornly remain untouched no matter what the user inputs.

Answer №1

If you want to make sure that a textfield is filled out, you can use the required attribute:

<input type="text" required />

To style it based on its validity using CSS, you can do the following:

input:invalid { background: pink; }

Alternatively, for older browsers, you can use:

input:valid { background: purple; }

Answer №2

The best way to achieve this effect is by utilizing JavaScript. Take a look at this example which demonstrates the use of jQuery for the task.

If your goal is to modify the background-color only when an element is in focus, you can utilize the handy :focus pseudo-selector. Check out this example for a practical demonstration.

Answer №3

You can achieve this using CSS exclusively.

  input:placeholder-shown{
    background-color:#cacaca;
  }

To learn more, check out this link.

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