Can You Style Parts of an Input Field\'s Text?

Styling Portions of an Input Field

Question:

Is it possible to apply different styles to specific segments of an input field's value as the user enters text?

Answer:

Unfortunately, styles cannot be applied selectively to portions of an input field.

Workaround:

To achieve the desired effect, a solution involving multiple elements is necessary.

Approach:

1. Element Division:

   • Divide the input field into three sections based on the insertion point:

     • Before: Text entered previously
     • Edited: Text currently being entered
     • After: Text entered after the insertion point

2. Markup Generation:

   • Replace the input element with a container element that resembles an input field.
   • Split the original input value into the three sections mentioned above.
   • Wrap each section in individual elements (e.g., spans).

3. Event Handling:

   • Monitor user input using event listeners (e.g., click, keydown, keyup).
   • Use these events to identify the three sections of the input value.
   • Update the element styles based on the edited section.

Example Markup:

<div class="input">
  <span class="nonEdited before">foo</span>
  <span class="edited">fizz</span>
  <span class="nonEdited after">bar</span>
</div>

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