How Can I Change Placeholder Color in JavaScript?

Updating Placeholder Color with JavaScript

While JavaScript does not provide a direct solution to modify the placeholder color, you can achieve this effect using CSS variables. This approach allows you to update the placeholder color dynamically based on user input or external factors.

Target the Needed Element

To ensure that the color change only affects a specific placeholder, you can target the input element using its unique identifier or a combination of selectors. For instance, the following code updates the placeholder color for all text input elements on the page:

::placeholder {
  color: var(--c, red);
}

Update Color Dynamically

To update the placeholder color programmatically, you can manipulate the CSS variable '--c' using JavaScript. This variable is defined in the CSS and referenced in the placeholder definition. The following code demonstrates how to set the placeholder color to blue:

document.querySelector('input[type=text]').style.setProperty("--c", "blue");

Example

Consider the following HTML and CSS code:

<input type="text" placeholder="I will be blue">
<input type="number" placeholder="I will remain red">
<button onclick="update()">change</button>

::placeholder {
  color: var(--c, red);
}

When you click the button, the JavaScript function 'update()' will run, setting the CSS variable '--c' to blue for all text inputs. As a result, the placeholder color of the first input will change to blue, while the second input will remain red due to its different type attribute.

By using CSS variables and JavaScript, you can easily customize the placeholder color of specific input elements, enhancing user experience and providing flexibility in your designs.

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