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Tips for keeping input box text aligned at all times
Home Web Front-end CSS Tutorial How to keep the text at the bottom while the input box height increases?

How to keep the text at the bottom while the input box height increases?

Apr 05, 2025 pm 02:12 PM
ai absolute positioning relative positioning

How to keep the text at the bottom while the input box height increases?

Tips for keeping input box text aligned at all times

In web development, dynamically adjusting the height of the input box and keeping the bottom of the text aligned is a common problem. Although it can be achieved simply using padding, it is not effective when the height changes. This article introduces a more reliable approach to solving this problem using containers and absolute positioning.

Let's look at an example:

<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
  input {
    height: 60px; /* 初始高度 */
    border: none; /* 隱藏默認邊框 */
  }
  .input-container {
    border: 1px solid #ccc; /* 為容器添加邊框 */
    position: relative; /* 啟用相對定位 */
  }
  .input-container input {
    position: absolute; /* 將輸入框設(shè)置為絕對定位 */
    bottom: 0; /* 將輸入框底部固定在容器底部 */
    left: 0; /* 將輸入框左端固定在容器左端 */
    width: 100%; /* 確保輸入框占據(jù)容器的全部寬度 */
  }
</style>
<div class="input-container">
  <input type="text" placeholder="在此輸入文本">
</div>

In this example, we create a div container called input-container and set its relative positioning. Then, hide the default border of the input box and set it to absolute positioning and pin it to the bottom of the container via bottom: 0; property. This way, the text content will always remain at the bottom regardless of the height of the input box. The border of the container provides a visual border effect. This method is more flexible and easier to maintain than simply using padding. Hope this method can effectively solve your problem.

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