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How does JavaScript obtain macro control data?

Apr 03, 2024 pm 09:54 PM
Macro control

JavaScript 获取宏控件数据的方法有两种:get("value"):获取输入框、文本区域和选择列表的 value 属性值。getRemoteValue():获取 iframe 和 audio 等远程加载的宏控件的远程数据。

How does JavaScript obtain macro control data?

JavaScript 获取宏控件数据

宏控件是网站中用于呈现自定义 UI 元素的组件。JavaScript 可以用来获取宏控件的数据,从而对 UI 行为进行动态控制。

方法

获取宏控件数据的方法有两种:

1. get("value")

对于输入框、文本区域和选择列表等宏控件,可以使用 get("value") 方法获取其 value 属性的值:

const input = document.getElementById("my-input");
const value = input.get("value");

2. getRemoteValue()

对于 iframe 和 audio 等远程加载的宏控件,可以使用 getRemoteValue() 方法获取其远程数据:

const iframe = document.getElementById("my-iframe");
iframe.getRemoteValue((result) => {
  // result 包含 iframe 中的 HTML 内容
});

实战案例

案例:更改输入框值

假设我们有一个输入框,想通过 JavaScript 更改其值:

<input id="my-input" value="初始值">
// 获取输入框
const input = document.getElementById("my-input");

// 设置新值
input.set("value", "新值");

运行此代码后,输入框的值将从 "初始值" 更改为 "新值"。

注意事项

  • 对于某些宏控件,如下拉菜单,get("value") 返回的是选中的值,而非文本内容。
  • getRemoteValue() 是异步方法,这意味着回调函数会在远程数据加载完成后执行。

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