WPF浏览器javascript回调

本文关键字：回调 javascript 浏览器 WPF | 更新日期: 2023-09-27 18:12:14

如果有javascript:

function calculateValues(callback)
        {
            window.external.getHistoryRange(0,1,"",function(res){
                var hist = eval(res);
                histCount = hist.historyCount;
                hist = hist.historyContent;
                if (histCount == 0)
                {
                    return;
                }
                $("#history_table").show();
                var $row = addAlertHistoryRow(hist[0]);
                var rowHeight = $row.height();
                pageItemsCount = Math.floor(contentHeight / rowHeight);
                curPageNum = 0;
                $row.remove();
                if (callback) callback();
            });

        }

函数calculateValues(callback)的回调参数为:

function(){statItempos = 0; gethistoryandshow(pageNum,startItemsPos,callback);}

和c#代码，与该脚本(ObjectForScripting):

public string getHistoryRange(string strVar0 = "", string strVar1 = "", string strVar2 = "", string strVar3 = "")
        {
            string res = "";
            using (DeskAlertsDbContext db = new DeskAlertsDbContext())
            {
                var alerts = db.HistoryAlerts.OrderBy(a => a.ReciveTime)
                    .Include(b => b.alert.WINDOW)
                    .ToList();
                foreach (var alert in alerts)
                {
                    res += ("{'"id'":" + System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Alert_id) +
                            ",'"date'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(
                                alert.ReciveTime.ToString(CultureInfo.InvariantCulture)) + "'",'"alert'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alerttext) + "'",'"title'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Title) + "'",'"acknow'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Acknown) + "'",'"create'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Create_date) + "'",'"class'":'"" +
                            "1" + "'",'"urgent'":'"" + System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Urgent) +
                            "'",'"unread'":'"" + Convert.ToInt32(alert.isclosed).ToString() + "'",'"position'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Position) + "'",'"ticker'":'"" +
                            alert.alert.Ticker + "'",'"to_date'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.To_date) + "'"},");
                }
                res = res.TrimEnd(','); //trim right ","
                res = "({'"historyCount'":" + alerts.Count.ToString() + ",'"historyContent'":[" + res + "]});";
                Browserwindow.Wb.InvokeScript("eval", new object[] { strVar3 });
                Browserwindow.Wb.InvokeScript("CallbackFunction", new object[] { res });
                return res;
            }
        }

On string: " Browserwindow.Wb.InvokeScript("eval", new object[] { strVar3 }); "我尝试从javascript调用匿名函数，并有一个错误。

问题是:如何使这个逻辑。如何执行JS函数的参数不同的函数。然后继续JS。如果我试图给函数命名，并调用它，函数工作，但全局上下文(if (callback) callback();)变得不可用

WPF浏览器javascript回调

您的回调函数名称不正确。

代替

Browserwindow.Wb.InvokeScript("CallbackFunction", new object[] { res });


Browserwindow.Wb.InvokeScript("calculateValues", new object[] { res });

嗯…只是让我的变量是动态的(不是字符串)，并且都工作

public string getHistoryRange(string strVar0 = "", string strVar1 = "", string strVar2 = "", dynamic strVar3 = null)
        {
            string res = "";
            using (DeskAlertsDbContext db = new DeskAlertsDbContext())
            {
                var alerts = db.HistoryAlerts.OrderBy(a => a.ReciveTime)
                    .Include(b => b.alert.WINDOW)
                    .ToList();
                foreach (var alert in alerts)
                {
                    res += ("{'"id'":" + System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Alert_id) +
                            ",'"date'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(
                                alert.ReciveTime.ToString(CultureInfo.InvariantCulture)) + "'",'"alert'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alerttext) + "'",'"title'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Title) + "'",'"acknow'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Acknown) + "'",'"create'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Create_date) + "'",'"class'":'"" +
                            "1" + "'",'"urgent'":'"" + System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Urgent) +
                            "'",'"unread'":'"" + Convert.ToInt32(alert.isclosed).ToString() + "'",'"position'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.Position) + "'",'"ticker'":'"" +
                            alert.alert.Ticker + "'",'"to_date'":'"" +
                            System.Web.HttpUtility.JavaScriptStringEncode(alert.alert.To_date) + "'"},");
                }
                res = res.TrimEnd(','); //trim right ","
                res = "({'"historyCount'":" + alerts.Count.ToString() + ",'"historyContent'":[" + res + "]});";
                dynamic variable = Browserwindow.Wb.InvokeScript("eval", new object[] { strVar3 });
                variable(res);
                return res;
            }
        }
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