Cesium JS API
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NavigationHelpButton

NavigationHelpButton是cesiumjs中的一个控件，提供了地图的导航帮助功能。

用法

可以使用以下代码将NavigationHelpButton添加到地图中：

var helpButton = new Cesium.NavigationHelpButton({
    container : 'navigation-help-button'
});

其中，变量container用于指定将导航帮助按钮放置的HTML元素的ID。在此示例中，导航帮助按钮将被放置在具有ID为“navigation-help-button”的HTML元素中。

API

构造函数

NavigationHelpButton(options)

options：Object

一个包含以下属性的对象：

  • container：String | HTML Element。指定导航帮助按钮要放置的HTML元素的ID或本身。必需的。

实例属性

var helpButton = new Cesium.NavigationHelpButton({
    container : 'navigation-help-button'
});

var text = helpButton.tooltipText;
  • container：String | HTML Element。指定导航帮助按钮要放置的HTML元素的ID或本身。
  • viewModel：NavigationHelpButtonViewModel。控件的视图模型。
  • tooltipText：String。导航帮助按钮的提示文本。

实例方法

var helpButton = new Cesium.NavigationHelpButton({
    container : 'navigation-help-button'
});

helpButton.viewModel.showHelp.toggle();
  • getViewModel()：NavigationHelpButtonViewModel。获取控件的视图模型。
  • isDestroyed()：Boolean。如果该对象已经被销毁，则返回true，否则返回false。
  • destroy()。销毁该对象及其资源。

示例

下面的代码演示如何将NavigationHelpButton添加到地图上：

<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>cesium-navigation-help-button 示例</title>
    <style>
        #navigation-help-button {
            position: absolute;
            top: 10px;
            left: 10px;
            z-index: 1;
        }
    </style>
    <script src="https://cesium.com/downloads/cesiumjs/releases/1.85/Build/Cesium/Cesium.js"></script>
    <link href="https://cesium.com/downloads/cesiumjs/releases/1.85/Build/Cesium/Widgets/widgets.css" rel="stylesheet">
</head>
<body>
<div id="cesiumContainer"></div>
<div id="navigation-help-button"></div>
<script>
    var viewer = new Cesium.Viewer('cesiumContainer');
    var helpButton = new Cesium.NavigationHelpButton({
        container : 'navigation-help-button'
    });
</script>
</body>
</html>

在此示例中，导航帮助按钮将被放置在具有ID为“navigation-help-button”的HTML元素中，并且它在地图上的位置将被指定为左上角。