Optimize text box alignment: Make your form more beautiful

By using CSS and JavaScript, you can optimize the text box alignment and improve the readability and user experience of the form. Specific optimization methods include: using CSS text-align and vertical-align properties for horizontal and vertical alignment. Dynamically align text boxes using the JavaScript setSelectionRange and getComputedStyle functions. In practical cases, the alignment effect can be optimized by setting the text box width, center alignment, and vertical center alignment.

Optimize text box alignment: Make your form more beautiful

In forms, text box alignment is crucial to user experience and readability . Improper alignment can lead to confusion and visual clutter. This article will introduce how to use CSS and JavaScript to optimize text box alignment, and provide a practical case for reference.

Use CSS to align text boxes

CSS provides a variety of ways to align text boxes:

• text-align: is used horizontally Align text. It can be set to left, center, right or justify.
• vertical-align: Used to vertically align text. It can be set to top, middle, bottom or baseline.

/* 水平对齐文本框为居中 */
input[type="text"] {
  text-align: center;
}

/* 垂直对齐文本框为顶部 */
input[type="text"] {
  vertical-align: top;
}

Use JavaScript to align the text box

JavaScript can dynamically align the text box:

• setSelectionRange(): Used Set the selected text range in the text box.
• getComputedStyle(): Used to get the computed style properties of the element.

// 获取文本框元素
const input = document.querySelector('input[type="text"]');

// 设置文本框光标到开头
input.setSelectionRange(0, 0);

// 获取文本框的内边距
const paddingLeft = parseInt(getComputedStyle(input).paddingLeft);
const paddingRight = parseInt(getComputedStyle(input).paddingRight);

// 计算文本框的可用宽度
const availableWidth = input.clientWidth - paddingLeft - paddingRight;

// 设置文本框文本对齐为居中
input.style.textAlign = availableWidth / 2 > 0 ? 'center' : 'left';

Practical Case

Consider a form containing two text boxes:

<form>
  <label for="name">姓名：</label>
  <input type="text" id="name" />
  <label for="email">电子邮件：</label>
  <input type="text" id="email" />
  <button type="submit">提交</button>
</form>

Using the techniques discussed above, we can optimize the text box alignment:

input[type="text"] {
  text-align: center;
  vertical-align: middle;
  width: 200px;
}

const inputs = document.querySelectorAll('input[type="text"]');
inputs.forEach((input) => {
  input.setSelectionRange(0, 0);
  const paddingLeft = parseInt(getComputedStyle(input).paddingLeft);
  const paddingRight = parseInt(getComputedStyle(input).paddingRight);
  const availableWidth = input.clientWidth - paddingLeft - paddingRight;
  input.style.textAlign = availableWidth / 2 > 0 ? 'center' : 'left';
});

This way, the text box will be centered horizontally and vertically aligned in the middle. This alignment improves form readability and user experience.

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