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       
(Showing Draft Content)

异步函数

您可以使用以下命令在服务器端计算 AsyncFunctionAsyncEvaluateContext 。 你可以使用 AsyncFunctionEvaluateMode 类用于指定如何计算。

示例代码

本示例定义了一个自定义函数,该函数扩展了 AsyncFunction 类并创建时间以模拟服务器端计算。

var asum = function () {}
//Define a class "ASUM" that extends AsyncFunction
asum.prototype = new GC.Spread.CalcEngine.Functions.AsyncFunction("ASUM", 1, 255);
//Set default value to "Loading..."
asum.prototype.defaultValue = function () { return "Loading..."; };
//Override the evaluateAsync function
asum.prototype.evaluateAsync = function (context) {
var args = arguments;
//Use a timeout to simulate the server side evaluate or use an ajax post
    setTimeout(function () {
//Evaluation logic
        var result = 0;
    for (var i = 0; i < args.length; i++) {
        result += args[i];
    }
    result *= 2;
//将异步计算结果设置为CalcEngine
        context.setAsyncResult(result);
}, 2000);
}
//Or use Ajax post
/$.ajax({
    //url: '@Url.Action("ASUM", "Home")',
    //type: "POST",
    //data: JSON.stringify(args),
    //contentType: "application/json,charset=UTF-8",
    //success: function (data) {
    //context.SetAsyncResult(data.result);
    //}
//});
//添加ASUM函数以展开并设置公式
activeSheet.addCustomFunction(new asum());
activeSheet.setValue(0, 0, 5);
activeSheet.setValue(0, 1, 15);
activeSheet.setFormula(1, 1, "ASUM(A1,B1)");

本示例使用 Refresh公式重新计算公式。

<!DOCTYPE html>
<html>
<head>
<title>SpreadJS</title>
<link href="./css/gc.spread.sheets.13.0.0.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="./scripts/gc.spread.sheets.all.13.0.0.min.js"></script>
<!--jQuery References-->
<script src="http://code.jquery.com/jquery-2.0.2.js" type="text/javascript"></script>
  <script type="text/javascript">
                            window.onload = function(){
        var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});                                          
        var sheet = spread.getActiveSheet();
        var GetNumberFromServer = function () {
        }
        GetNumberFromServer.prototype = new GC.Spread.CalcEngine.Functions.AsyncFunction("GETNUMBERFROMSERVER", 2, 2);
        GetNumberFromServer.prototype.evaluate = function (context, arg1, arg2) {
            var self = this;
            $.get('http://xa-tools-shdev/asyncfunction/api/values/' + (arg1 || 1), function (value) {
                context.setAsyncResult(value);
            });
        }
        GC.Spread.CalcEngine.Functions.defineGlobalCustomFunction("GETNUMBERFROMSERVER", new GetNumberFromServer());
        sheet.setValue(0, 0, 'ChangeValue');
        sheet.setValue(0, 1, 'Formula');
        sheet.setValue(0, 2, 'Result');
        sheet.setValue(0, 3, 'Comments');
        sheet.setValue(1, 3, 'On A2 changed');
        sheet.setValue(2, 3, 'On A2 changed');
        sheet.setValue(3, 3, 'Evaluate once');
        sheet.setValue(4, 3, 'Every 2 seconds');
        sheet.setValue(1, 0, 1);
        sheet.setValue(1, 1, '=GetNumberFromServer(A2)');
        sheet.setValue(2, 1, '=Refresh(GetNumberFromServer(A2), 0)');
        sheet.setValue(3, 1, '=Refresh(GetNumberFromServer(A2), 1)');
        sheet.setValue(4, 1, '=Refresh(GetNumberFromServer(A2), 2, 2000)');
        sheet.setFormula(1, 2, '=GetNumberFromServer(A2)');
        sheet.setFormula(2, 2, '=Refresh(GetNumberFromServer(A2), 0)');
        sheet.setFormula(3, 2, '=Refresh(GetNumberFromServer(A2), 1)');
        sheet.setFormula(4, 2, '=Refresh(GetNumberFromServer(A2), 2, 2000)');
        sheet.setColumnWidth(0, 100);
        sheet.setColumnWidth(1, 300);
        sheet.setColumnWidth(2, 200);
        sheet.setColumnWidth(3, 200);
        sheet.setValue(7, 1, "=Refresh(now(), 2, 1000)");
        sheet.setValue(7, 3, "Every 1 seconds");
        sheet.setFormula(7, 2, "=Refresh(now(), 2, 1000)");
        var GetTimeFromServer = function () {
        }
        GetTimeFromServer.prototype = new GC.Spread.CalcEngine.Functions.AsyncFunction("GETTIMEFROMSERVER", 2, 2);
        GetTimeFromServer.prototype.evaluate = function (context) {
            $.get('http://xa-tools-shdev/asyncfunction/api/time/', function (value) {
                context.setAsyncResult(value);
            });
        }
        GetTimeFromServer.prototype.evaluateMode = function () {
            return 2;
        };
        GetTimeFromServer.prototype.interval = function () {
            return 1000;
        };
        GC.Spread.CalcEngine.Functions.defineGlobalCustomFunction("GETTIMEFROMSERVER", new GetTimeFromServer());
        sheet.setValue(10, 1, "=GetTimeFromServer()");
        sheet.setValue(10, 3, "Every 1 seconds");
        sheet.setFormula(10, 2, "=GetTimeFromServer()");
        sheet.getCell(10, 2).hAlign(GC.Spread.Sheets.HorizontalAlign.right);
}
</script>
</head>
<body>
<div id="ss" style="width:100%;height:500px;border:1px solid gray"></div>
</body>
</html>