CefSharp 运行 JavaScript

Question

我在 CefSharp 中遇到困难运行 JS，因为命令运行紧接着彼此。基本上，我需要一个等待命令来等待页面在执行完最后一个脚本后加载。

因此它将是：

await Browser.ExecuteScriptAsync(script1);
Browser.WaitForLoad();
Task<JavascriptResponse> test = await Browser.EvaluateScriptAsync(script2);

我找到了一些资源，但我只是编程的新手，所以我发现弄清楚如何做我想做的事情有点困难。

using System.Threading;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using CefSharp;
using CefSharp.Wpf;

namespace WpfApp2
{
    public partial class MainWindow : Window
    {
        private string MessagesInbox;
        public MainWindow()
        {
            InitializeComponent();
        }


        private void Browser_Loaded(object sender, RoutedEventArgs e)
        {
            Browser.LoadingStateChanged += async (Sender, args) => {if (args.IsLoading == false)
                {
                    await Browser.EvaluateScriptAsync(@"document.getElementById('User').value = 'test'; document.getElementById('Password').value = 'password'; document.getElementById('LoginButton').click();");
                }};
            Task<JavascriptResponse> test = Browser.EvaluateScriptAsPromiseAsync(@"return new Promise(function(resolve, reject) { setTimeout(resolve.bind(null, { var test = ''; document.querySelectorAll('.MasterAction').forEach(el => test += el.children[3].children[0].href + ', ')}), 2000);");
            MessagesInbox = test.Result.ToString();
            MessageBox.Show(MessagesInbox);
        }
    }
}

Answer 1

您还应该检查第二种方法的 IsLoading，您可以使用 bool 来跟踪您是否已经登录，并在该函数中使用第二种方法，如下所示：

public bool loggedIn = false;
private void Browser_Loaded(object sender, EventArgs e)
    {
        Browser.LoadingStateChanged += async (Sender, args) =>
        {
            if (args.IsLoading == false)
            {
                if (!loggedIn)
                {
                    await Browser.EvaluateScriptAsync(@"document.getElementById('User').value = 'test'; document.getElementById('Password').value = 'password'; document.getElementById('LoginButton').click();")
                        .ContinueWith(x =>
                        {
                            var response = x.Result;
                            System.Diagnostics.Debug.WriteLine(response.Result);
                            if (response.Result == null)
                            {
                                System.Diagnostics.Debug.WriteLine("should be changed to true");
                                loggedIn = true;
                            }
                        });
                }
                else
                {
                    JavascriptResponse test = await Browser.EvaluateScriptAsync(@"var test = ''; document.querySelectorAll('.MasterAction').forEach(el => test += el.children[3].children[0].href + ', ');test.substr(0,test.length-2)");
                    MessagesInbox = test.Result.ToString();
                    System.Diagnostics.Debug.WriteLine(MessagesInbox);
                }
            }
        };
    }

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