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。
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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