概述
本 Demo 展示了如何在 SpreadJS 中使用饼图(Data Chart - Pie Chart)进行数据可视化。Demo 加载了预定义的饼图模板,并展示了如何通过数据图表配置面板来查看和编辑图表设置。
实现思路
加载预定义模板:通过 fromJSON 方法加载包含饼图配置的 JSON 模板
创建配置面板:实例化 DataChartConfigPanel 为饼图提供可视化配置界面
选中数据图表:调用 isSelected(true) 方法选中第一个饼图,使其处于激活状态
代码解析
加载模板并初始化
这段代码异步加载预定义的模板 JSON 文件,并使用 fromJSON 方法将其导入到 SpreadJS 工作簿中。模板中已包含饼图的配置信息和数据。
创建数据图表配置面板
DataChartConfigPanel 构造函数接收两个参数:
host:配置面板的容器元素 ID
spread:SpreadJS 工作簿实例
该面板提供了可视化的图表配置界面,用户可以通过面板修改图表类型、数据绑定、样式等属性。
选中数据图表
dataCharts.all() 方法返回当前工作表中所有数据图表的数组。通过 isSelected(true) 将第一个图表设置为选中状态,使其在配置面板中处于激活状态,便于用户查看和编辑。
运行效果
页面加载时显示"加载模板及数据……"提示
加载完成后,在工作表中显示一个饼图
右侧显示数据图表配置面板,可以对饼图进行各种配置
饼图处于选中状态,配置面板中显示该图表的详细设置
如果在新窗口中打开 Demo,可以在 SpreadJS 设计器中查看完整的图表设置
API 参考
DataChartConfigPanel 构造函数
host:string | HTMLElement - 配置面板的容器元素或元素 ID
spread:Workbook - SpreadJS 工作簿实例
dataCharts.all() 方法
返回当前工作表中所有数据图表的数组。
isSelected() 方法
value:boolean - 可选,设置为 true 选中图表,false 取消选中
返回值:获取时返回布尔值表示选中状态,设置时不返回值
window.onload = async () => {
const loadingTip = addLoadingTip();
const { spread, designer } = createSpreadAndDesigner();
const res = await fetch('$DEMOROOT$/zh/sample/features/data-charts/chart-types/pie/spread.json');
await spread.fromJSON(await res.json());
new GC.Spread.Sheets.DataCharts.DataChartConfigPanel('panel-host', spread);
spread.getActiveSheet().dataCharts.all()[0].isSelected(true);
loadingTip.remove();
if (designer) {
designer.refresh();
}
}
function createSpreadAndDesigner() {
const demoHost = document.getElementById('demo-host');
if (window !== top) {
return {
spread: new GC.Spread.Sheets.Workbook('spread-host', { sheetCount: 1 }),
}
} else {
const designer = new GC.Spread.Sheets.Designer.Designer(demoHost, undefined, undefined, { sheetCount: 1 });
return {
designer,
spread: designer.getWorkbook(),
}
}
}
function addLoadingTip() {
const div = document.createElement('div');
div.style.position = 'absolute';
div.style.inset = '0';
div.style.display = 'flex';
div.style.alignItems = 'center';
div.style.justifyContent = 'center';
div.style.background = 'white';
div.style.zIndex = '100';
div.textContent = '加载模板及数据……';
document.body.appendChild(div);
return div;
}
<!doctype html>
<html style="height:100%;font-size:14px;">
<head>
<meta charset="utf-8" />
<meta name="spreadjs culture" content="zh-cn" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" type="text/css" href="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets/styles/gc.spread.sheets.excel2013white.css">
<link rel="stylesheet" type="text/css" href="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets-designer/styles/gc.spread.sheets.designer.light.min.css">
<link rel="stylesheet" type="text/css" href="styles.css">
<script src="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets/dist/gc.spread.sheets.all.min.js" type="text/javascript"></script>
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<script src="$DEMOROOT$/spread/source/js/license.js" type="text/javascript"></script>
<script>
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]
function appendScriptNode (src) {
const script = document.createElement('script');
script.src = src;
script.async = false;
script.type = 'text/javascript';
document.head.appendChild(script);
}
if (top === window) { // not in iframe
designerDependencyScripts.forEach(appendScriptNode);
}
</script>
<script src="app.js" type="text/javascript"></script>
</head>
<body>
<div class="sample-tutorial">
<div id="demo-host">
<div id="spread-host"></div>
<div id="panel-host"></div>
</div>
</div>
</body>
</html>
body {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
.sample-tutorial {
position: relative;
height: 100%;
overflow: hidden;
}
#demo-host {
width: 100%;
height: 100%;
overflow: hidden;
float: left;
}
#spread-host {
position: absolute;
top: 0;
left: 0;
width: calc(100% - 380px);
height: 100%;
}
#panel-host {
position: absolute;
top: 0;
right: 0;
width: 380px;
height: 100%;
}
