下拉菜单使开发人员能够向工作簿中的单元格添加具有特定属性的下拉菜单。 这些下拉菜单不需要任何额外的代码，只需指定要使用哪一种下拉菜单即可。
SpreadJS目前拥有8种下拉列表，当前介绍的是工作流下拉列表。
在打开工作流列表之前，需要在单元格样式中设置选项数据。
例如：
工作流列表中的选项应该符合下面的结构：
let spreadNS = GC.Spread.Sheets;
window.onload = function () {
let spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"));
initSpread(spread);
};
function initSpread(spread) {
let sheet = spread.getSheet(0);
sheet.suspendPaint();
// -------------------- WorkFlow ---------------------
let style = new GC.Spread.Sheets.Style();
style.cellButtons = [
{
imageType: GC.Spread.Sheets.ButtonImageType.dropdown,
command: "openWorkflowList",
useButtonStyle: true,
}
];
style.dropDowns = [
{
type: GC.Spread.Sheets.DropDownType.workflowList,
option: {
items: [
{ value: "New", transitions: [1] },
{ value: "Open",transitions: [0,2,3,5] },
{ value: "In Progress", transitions: [1, 3, 5] },
{ value: "Resolved", transitions: [5, 4] },
{ value: "Reopened",transitions: [5, 3, 2] },
{ value: "Closed", transitions: [4] },
]
}
}
];
sheet.setText(4, 4, "Workflow List");
sheet.setStyle(5, 4, style);
sheet.resumePaint();
spread.commandManager().execute({cmd:"openWorkflowList",row:5,col:4,sheetName:"Sheet1"});
}
<!doctype html>
<html style="height:100%;font-size:14px;">
<head>
<meta name="spreadjs culture" content="zh-cn" />
<meta charset="utf-8" />
<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">
<script src="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets/dist/gc.spread.sheets.all.min.js"
type="text/javascript"></script>
<script
src="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets-resources-zh/dist/gc.spread.sheets.resources.zh.min.js"
type="text/javascript"></script>
<script src="$DEMOROOT$/spread/source/js/license.js" type="text/javascript"></script>
<script src="app.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
<div class="sample-tutorial">
<div id="ss" style="width:100%; height: 100%"></div>
</div>
</body>
</html>
.sample-tutorial {
position: relative;
height: 100%;
overflow: hidden;
}
body {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
