Javascript 使用WebView和按钮滚动条款和条件_Javascript_Webview_Xamarin.forms

Javascript 使用WebView和按钮滚动条款和条件

javascript webview xamarin.forms

Javascript 使用WebView和按钮滚动条款和条件,javascript,webview,xamarin.forms,Javascript,Webview,Xamarin.forms,我想实现一个ContentPage，它有一个WebView html文本和我同意和取消的按钮问题：我想在堆栈中插入一个webView，因此，我必须声明宽度和高度。高度是我的主要问题，因为我想跨越或填充并扩展WebView 所以我追求webView.evalsomeJS代码函数，但我不能得到html的返回值高度？另外，我用另一种方法，在webView位于底部时获取事件，然后获取一些布尔值代码如下： StackLayout mainStackLayout = new StackLayout

我想实现一个ContentPage，它有一个WebView html文本和我同意和取消的按钮

问题：我想在堆栈中插入一个webView，因此，我必须声明宽度和高度。高度是我的主要问题，因为我想跨越或填充并扩展WebView

所以我追求webView.evalsomeJS代码函数，但我不能得到html的返回值高度？另外，我用另一种方法，在webView位于底部时获取事件，然后获取一些布尔值

代码如下：

StackLayout mainStackLayout = new StackLayout { VerticalOptions = LayoutOptions.Center, HorizontalOptions = LayoutOptions.Center };

        Frame f = new Frame { BackgroundColor = Constants.iBackgroundWhite };
        StackLayout motherStack = new StackLayout { Margin = new Thickness(15, 30) };

        StackLayout buttonStack = new StackLayout
        {
            Orientation = StackOrientation.Horizontal,
            VerticalOptions = LayoutOptions.Center,
            HorizontalOptions = LayoutOptions.Center,
            Margin = new Thickness(0, 10)
        };
        Label captionLabel = new Label
        {
            Text = "Terms and Conditions",
            TextColor = Constants.iPink,
            FontAttributes = FontAttributes.Bold,
            FontSize = 25,
            Margin = new Thickness(10, 0, 0, 15)
        };


        var body = new HtmlWebViewSource();
        body.Html = @"<html><body>
 Lorem ipsum dolor sit amet, utinam tritani interpretaris mel ei, perfecto 
 instructior ut vim. Usu ad erant maiorum, tollit latine ei ius, ea eos 
 vitae nominati iracundia. Consul laboramus eam ad, eu est nisl expetendis 
 philosophia. Doctus ceteros eu per, ut vel fierent similique accommodare, 
 ius similique consectetuer et.
 Te nec vero quas utamur, in possim nonumes inimicus his, an animal recusabo 
 per. Eos ut natum bonorum legimus. Nihil liberavisse no usu. Sea dignissim 
 mnesarchum cu, et per simul persius, constituto definitionem per in. No vix 
 novum verear apeirian, aliquam accumsan definitionem mel at. Mea et autem 
 phaedrum iracundia, reque vidisse at usu.
 Ad mea commodo oportere. Quo ad debitis accusata atomorum. His dicit 
 labores et, in dicat dolorum abhorreant est, ex qui voluptua oportere. Eum 
 ex nonumy cotidieque signiferumque. Laudem commodo omittantur quo in, voluptua 
 reformidans nam ad, ignota dicunt sed an. Mei ad sonet nonumes, no sit detracto 
 officiis.
 Cibo exerci duo eu. Has habeo atomorum disputationi te, ne has idque delicata. 
 Cibo nihil euismod qui ut. Dicit ubique maiorum duo et, eam ad probo percipit 
 sententiae. Quas lucilius vis ne. Id nec fabellas consetetur, sit id melius 
 impetus cotidieque, eum fierent praesent rationibus id. Qui et liber offendit 
 verterem, ad eripuit eruditi qui.
 Vis affert instructior cu, cum id principes adolescens. Per omnes nominati 
 salutatus at, ne audiam noluisse mel, aeque docendi fierent pro ne. At putant 
 voluptua vis, duo ne etiam tritani. Ut solet laudem qualisque usu, dicunt 
 adipisci his cu. Ea labore convenire corrumpit nec. Ne est quando virtute, 
 virtute adipiscing an ius, an mei iracundia posidonium

    </body> </html>";

        _webView = new WebView
        {
            Source = body,
            VerticalOptions = LayoutOptions.FillAndExpand,
            HorizontalOptions = LayoutOptions.FillAndExpand,
            WidthRequest = App.ScreenWidth * 0.8,
            HeightRequest = 500
        };


        _webView.IsEnabled = false;


        #region Buttons
        Button okButton = new Button();
        okButton.SetWhiteButton();
        okButton.Text = "I ACCEPT";
        okButton.FontSize = Device.GetNamedSize(NamedSize.Large, typeof(Label)) - 5;
        okButton.WidthRequest = Device.GetNamedSize(NamedSize.Large, typeof(Button)) * 5;
        okButton.BorderRadius = Constants.BorderRadius + 5;

        Button cancelButton = new Button();
        cancelButton.SetDefaultButton();
        cancelButton.Text = "CANCEL";
        cancelButton.FontSize = Device.GetNamedSize(NamedSize.Large, typeof(Label)) - 5;
        cancelButton.WidthRequest = Device.GetNamedSize(NamedSize.Large, typeof(Button)) * 5;
        cancelButton.BorderRadius = Constants.BorderRadius + 5;

        bool isChekedTaC = false;
        okButton.Clicked += (s, e) =>
        {
            isChekedTaC = true;
            Navigation.PushAsync(new RegisterOnePageNew(isChekedTaC, registrationRequestModel, "1234"));
        };

       #endregion

        //var a = _webView.Eval("window.onscroll = function(ev) { if ((window.innerHeight + window.pageYOffset) >= document.body.offsetHeight){alert('youre on the bottom');}};"

        //_webView.Navigated += (o, s) => {
        //    _webView.Eval("alert('text')");
        //};
        buttonStack.Children.Add(cancelButton);
        buttonStack.Children.Add(okButton);
        buttonStack.HorizontalOptions = LayoutOptions.CenterAndExpand;
        buttonStack.VerticalOptions = LayoutOptions.Start;

        grid.Children.Add(_webView, 0, 0);
        //grid.Children.Add(buttonStack, 1, 0);


        StackLayout sl = new StackLayout();
        //sl.Children.Add(contentLabel);
        sl.Children.Add(_webView);
        sl.Children.Add(buttonStack);

        mainStackLayout.Children.Add(captionLabel);
        mainStackLayout.Children.Add(new ScrollView { Content = sl });
        //mainStackLayout.Children.Add(buttonStack);
        f.Content = mainStackLayout;
        motherStack.Children.Add(f);
        Content = sl;

    }



    protected override bool OnBackButtonPressed()
    {
        Navigation.PopAsync();
        return true;
    }

我只想在HTML WebView到达底部时显示我的两个按钮。我该怎么做

选项1：在底部时返回真/假我用XLabs HybridWebView成功地完成了一半。这是代码，也许对某些人会有用

public class HybridView : ContentPage
{
    HybridWebView hybrid;
    public HybridView()
    {
        var stack = new StackLayout
        {
            HorizontalOptions = LayoutOptions.FillAndExpand,
            VerticalOptions = LayoutOptions.FillAndExpand,
            BackgroundColor = Color.White
        };

        var body = new HtmlWebViewSource();
        body.Html = @"<html><body>
                        Lorem ipsum dolor sit amet, utinam tritani interpretaris mel ei, perfecto instructior ut vim. Usu ad erant maiorum, tollit latine ei ius, ea eos vitae nominati iracundia. Consul laboramus eam ad, eu est nisl expetendis philosophia. Doctus ceteros eu per, ut vel fierent similique accommodare, ius similique consectetuer et.
                        Te nec vero quas utamur, in possim nonumes inimicus his, an animal recusabo per. Eos ut natum bonorum legimus. Nihil liberavisse no usu. Sea dignissim mnesarchum cu, et per simul persius, constituto definitionem per in. No vix novum verear apeirian, aliquam accumsan definitionem mel at. Mea et autem phaedrum iracundia, reque vidisse at usu.
                        Ad mea commodo oportere. Quo ad debitis accusata atomorum. His dicit labores et, in dicat dolorum abhorreant est, ex qui voluptua oportere. Eum ex nonumy cotidieque signiferumque. Laudem commodo omittantur quo in, voluptua reformidans nam ad, ignota dicunt sed an. Mei ad sonet nonumes, no sit detracto officiis.
                        Cibo exerci duo eu. Has habeo atomorum disputationi te, ne has idque delicata. Cibo nihil euismod qui ut. Dicit ubique maiorum duo et, eam ad probo percipit sententiae. Quas lucilius vis ne. Id nec fabellas consetetur, sit id melius impetus cotidieque, eum fierent praesent rationibus id. Qui et liber offendit verterem, ad eripuit eruditi qui.
                        Vis affert instructior cu, cum id principes adolescens. Per omnes nominati salutatus at, ne audiam noluisse mel, aeque docendi fierent pro ne. At putant voluptua vis, duo ne etiam tritani. Ut solet laudem qualisque usu, dicunt adipisci his cu. Ea labore convenire corrumpit nec. Ne est quando virtute, virtute adipiscing an ius, an mei iracundia posidonium.
                      </body> </html>";


        hybrid = new HybridWebView
        {
            HorizontalOptions = LayoutOptions.FillAndExpand,
            VerticalOptions = LayoutOptions.FillAndExpand,
            BackgroundColor = Color.White,
            WidthRequest = 300,
            HeightRequest = 600,
            Source = body

        };

        stack.Children.Add(hybrid);

        Content = stack;
    }

    protected override void OnAppearing()
    {
        base.OnAppearing();
        hybrid.InjectJavaScript("window.onscroll = function(ev) { if ((window.innerHeight + window.pageYOffset) >= document.body.offsetHeight){alert('youre on the bottom');}};");
    }
}

现在我必须弄清楚如何从js获取xamarin表单的信息，你可以把我同意和取消按钮放到HTML中，然后注入到旧的源代码中。通过这种方式，您可以使用单个WebView来显示所有操作。

您必须使用特定于平台的代码。实际上，如果您使用HybridWebView，它应该已经有了使用RegisterAction调用C的选项。我确实做到了这一点，但当我通过C返回操作时，类似于：myvar.ReturnOnAction=data=>MyFunc//where MyFunc{App.Current.Main=new NavigationPagenew MyPage；}当在我的方法中输入时，程序将退出应用程序。稍后，我将发布我的完整代码.Tnx