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JS实现inpubox

2026-02-02 12:02:55JavaScript

实现 InputBox 的基本结构

使用 HTML 和 CSS 创建一个基础的输入框结构，确保样式简洁且易于扩展。

<div class="input-box">
  <input type="text" placeholder="Enter something..." class="input-field" />
  <button class="input-button">Submit</button>
</div>

.input-box {
  display: flex;
  border: 1px solid #ccc;
  border-radius: 4px;
  overflow: hidden;
  width: 300px;
}

.input-field {
  flex: 1;
  padding: 10px;
  border: none;
  outline: none;
}

.input-button {
  padding: 10px;
  background-color: #007bff;
  color: white;
  border: none;
  cursor: pointer;
}

.input-button:hover {
  background-color: #0056b3;
}

添加事件监听与交互逻辑

通过 JavaScript 为输入框和按钮添加交互功能，例如提交输入内容或实时验证。

JS实现inpubox

const inputField = document.querySelector('.input-field');
const inputButton = document.querySelector('.input-button');

inputButton.addEventListener('click', () => {
  const value = inputField.value.trim();
  if (value) {
    alert(`Submitted: ${value}`);
    inputField.value = '';
  } else {
    alert('Input cannot be empty!');
  }
});

inputField.addEventListener('keypress', (e) => {
  if (e.key === 'Enter') {
    inputButton.click();
  }
});

扩展功能：实时输入验证

为输入框添加实时验证逻辑，例如限制输入长度或检查特定格式。

JS实现inpubox

inputField.addEventListener('input', () => {
  const value = inputField.value;
  if (value.length > 20) {
    inputField.style.borderColor = 'red';
  } else {
    inputField.style.borderColor = '#ccc';
  }
});

动态生成 InputBox

通过 JavaScript 动态生成输入框组件，适用于需要动态添加输入框的场景。

function createInputBox(placeholder, buttonText) {
  const container = document.createElement('div');
  container.className = 'input-box';

  const input = document.createElement('input');
  input.type = 'text';
  input.placeholder = placeholder;
  input.className = 'input-field';

  const button = document.createElement('button');
  button.className = 'input-button';
  button.textContent = buttonText;

  button.addEventListener('click', () => {
    alert(`Submitted: ${input.value}`);
  });

  container.appendChild(input);
  container.appendChild(button);
  return container;
}

document.body.appendChild(createInputBox('Enter name...', 'Save'));

封装为可复用组件

将输入框逻辑封装为类或模块，便于在项目中复用。

class InputBox {
  constructor(options) {
    this.container = document.createElement('div');
    this.container.className = 'input-box';

    this.input = document.createElement('input');
    this.input.type = 'text';
    this.input.placeholder = options.placeholder || 'Enter...';
    this.input.className = 'input-field';

    this.button = document.createElement('button');
    this.button.className = 'input-button';
    this.button.textContent = options.buttonText || 'Submit';

    this.button.addEventListener('click', () => {
      if (options.onSubmit) {
        options.onSubmit(this.input.value);
      }
    });

    this.container.appendChild(this.input);
    this.container.appendChild(this.button);
  }

  appendTo(element) {
    element.appendChild(this.container);
  }
}

const myInputBox = new InputBox({
  placeholder: 'Type here...',
  buttonText: 'Send',
  onSubmit: (value) => alert(value)
});
myInputBox.appendTo(document.body);