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WebView

Summary

Represents the image chart control.

Signature 

1
public class WebView : ControlBase

Namespace

cAlgo.API

Examples

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 using cAlgo.API;
 namespace cAlgo.Robots
 {
     [Robot(AccessRights = AccessRights.None)]
     public class WebViewOnChart : Robot
     {
         private WebView _webView;
         private TextBox _addressTextBox;
         private TextBox _scriptTextBox;
         private Button _executeScriptButton;
         protected override void OnStart()
         {
             var goBackButton = new Button
             {
                 Text = "←",
                 Margin = 3
             };
             goBackButton.Click += OnGoBackButtonClick;
             var goForwardButton = new Button
             {
                 Text = "→",
                 Margin = 3
             };
             goForwardButton.Click += OnGoForwardButtonClick;
             _addressTextBox = new TextBox
             {
                 Text = "https://ctrader.com/",
                 Margin = 3,
                 Width = 150,
                 MinWidth = 150,
                 MaxWidth = 150
             };
             var goButton = new Button
             {
                 Text = "→",
                 Margin = 3
             };
             goButton.Click += OnGoButtonClick;
             var reloadButton = new Button
             {
                 Text = "Reload",
                 Margin = 3
             };
             reloadButton.Click += OnReloadButtonClick;
             var stopButton = new Button
             {
                 Text = "x",
                 Margin = 3
             };
             stopButton.Click += OnStopButtonClick;
             _scriptTextBox = new TextBox
             {
                 Text = "alert('Hi');",
                 Margin = 3,
                 Width = 150,
                 MinWidth = 150,
                 MaxWidth = 150,
                 IsEnabled = false
             };
             _executeScriptButton = new Button
             {
                 Text = "Execute Script",
                 Margin = 3,
                 IsEnabled = false
             };
             _executeScriptButton.Click += OnExecuteScriptButtonClick;
             var addressBarPanel = new StackPanel
             {
                 MaxHeight = 50,
                 VerticalAlignment = VerticalAlignment.Top,
                 BackgroundColor = Color.Black,
                 Orientation = Orientation.Horizontal
             };
             addressBarPanel.AddChild(goBackButton);
             addressBarPanel.AddChild(goForwardButton);
             addressBarPanel.AddChild(_addressTextBox);
             addressBarPanel.AddChild(goButton);
             addressBarPanel.AddChild(reloadButton);
             addressBarPanel.AddChild(stopButton);
             addressBarPanel.AddChild(_scriptTextbox);
             addressBarPanel.AddChild(_executeScriptButton);
             _webView = new WebView
             {
                 DefaultBackgroundColor = Color.Red
             };
             _webView.NavigationCompleted += OnWebViewNavigationCompleted;
             _webView.WebMessageReceived += OnWebViewWebMessageReceived;
             _webView.Loaded += OnWebViewLoaded;
             _webView.Unloaded += OnWebViewUnloaded;
             var mainGrid = new Grid(2, 1);
             mainGrid.Rows[0].SetHeightToAuto();
             mainGrid.Rows[1].SetHeightInStars(1);
             mainGrid.AddChild(addressBarPanel, 0, 0);
             mainGrid.AddChild(_webView, 1, 0);
             Chart.AddControl(mainGrid);
         }
         private void OnWebViewLoaded(WebViewLoadedEventArgs args)
         {
             Print($"Webview loaded, IsLoaded: {args.WebView.IsLoaded}");
             _webView.NavigateAsync(_addressTextBox.Text);
         }
         private void OnWebViewUnloaded(WebViewUnloadedEventArgs args)
         {
             Print($"Webview unloaded, IsLoaded: {args.WebView.IsLoaded}");
         }
         private void OnStopButtonClick(ButtonClickEventArgs args)
         {
             _webView.StopAsync();
         }
         private void OnExecuteScriptButtonClick(ButtonClickEventArgs args)
         {
             var result = _webView.ExecuteScript(_scriptTextBox.Text);
             Print($"IsSuccessful: {result.IsSuccessful} | Json: {result.Json}");
         }
         private void OnReloadButtonClick(ButtonClickEventArgs args)
         {
             _webView.ReloadAsync();
         }
         private void OnGoForwardButtonClick(ButtonClickEventArgs args)
         {
             _webView.GoForwardAsync();
         }
         private void OnGoBackButtonClick(ButtonClickEventArgs args)
         {
             _webView.GoBackAsync();
         }
         private void OnGoButtonClick(ButtonClickEventArgs args)
         {
             _webView.NavigateAsync(_addressTextBox.Text);
         }
         private void OnWebViewWebMessageReceived(WebViewWebMessageReceivedEventArgs args)
         {
             Print($"Source: {args.Source} | Message: {args.Message}");
         }
         private void OnWebViewNavigationCompleted(WebViewNavigationCompletedEventArgs args)
         {
             Print($"{args.HttpStatusCode} | {args.IsSuccessful} | {args.Url}");
             _addressTextBox.Text = args.Url;
             _scriptTextBox.IsEnabled = true;
             _executeScriptButton.IsEnabled = true;
         }
     }
 }

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 using cAlgo.API;
 namespace cAlgo.Robots
 {
     [Robot(AccessRights = AccessRights.None)]
     public class WebViewOnWindow : Robot
     {
         private WebView _webView;
         private TextBox _addressTextBox;
         private TextBox _scriptTextbox;
         private Button _executeScriptButton;
         protected override void OnStart()
         {
             var goBackButton = new Button
             {
                 Text = "←",
                 Margin = 3
             };
             goBackButton.Click += OnGoBackButtonClick;
             var goForwardButton = new Button
             {
                 Text = "→",
                 Margin = 3
             };
             goForwardButton.Click += OnGoForwardButtonClick;
             _addressTextBox = new TextBox
             {
                 Text = "https://ctrader.com/",
                 Margin = 3,
                 Width = 150,
                 MinWidth = 150,
                 MaxWidth = 150
             };
             var goButton = new Button
             {
                 Text = "→",
                 Margin = 3
             };
             goButton.Click += OnGoButtonClick;
             var reloadButton = new Button
             {
                 Text = "Reload",
                 Margin = 3
             };
             reloadButton.Click += OnReloadButtonClick;
             var stopButton = new Button
             {
                 Text = "x",
                 Margin = 3
             };
             stopButton.Click += OnStopButtonClick;
             _scriptTextbox = new TextBox
             {
                 Text = "alert('Hi');",
                 Margin = 3,
                 Width = 150,
                 MinWidth = 150,
                 MaxWidth = 150,
                 IsEnabled = false
             };
             _executeScriptButton = new Button
             {
                 Text = "Execute Script",
                 Margin = 3,
                 IsEnabled = false
             };
             _executeScriptButton.Click += OnExecuteScriptButtonClick;
             var addressBarPanel = new StackPanel
             {
                 MaxHeight = 50,
                 VerticalAlignment = VerticalAlignment.Top,
                 BackgroundColor = Color.Black,
                 Orientation = Orientation.Horizontal
             };
             addressBarPanel.AddChild(goBackButton);
             addressBarPanel.AddChild(goForwardButton);
             addressBarPanel.AddChild(_addressTextBox);
             addressBarPanel.AddChild(goButton);
             addressBarPanel.AddChild(reloadButton);
             addressBarPanel.AddChild(stopButton);
             addressBarPanel.AddChild(_scriptTextbox);
             addressBarPanel.AddChild(_executeScriptButton);
             _webView = new WebView
             {
                 DefaultBackgroundColor = Color.Red
             };
             _webView.NavigationCompleted += OnWebViewNavigationCompleted;
             _webView.WebMessageReceived += OnWebViewWebMessageReceived;
             _webView.Loaded += OnWebViewLoaded;
             _webView.Unloaded += OnWebViewUnloaded;
             var mainGrid = new Grid(2, 1);
             mainGrid.Rows[0].SetHeightToAuto();
             mainGrid.Rows[1].SetHeightInStars(1);
             mainGrid.AddChild(addressBarPanel, 0, 0);
             mainGrid.AddChild(_webView, 1, 0);
             var window = new Window
             {
                 Child = mainGrid
             };
             window.Show();
         }
         private void OnWebViewLoaded(WebViewLoadedEventArgs args)
         {
             Print($"Webview loaded, IsLoaded: {args.WebView.IsLoaded}");
             _webView.NavigateAsync(_addressTextBox.Text);
         }
         private void OnWebViewUnloaded(WebViewUnloadedEventArgs args)
         {
             Print($"Webview unloaded, IsLoaded: {args.WebView.IsLoaded}");
         }
         private void OnStopButtonClick(ButtonClickEventArgs args)
         {
             _webView.StopAsync();
         }
         private void OnExecuteScriptButtonClick(ButtonClickEventArgs args)
         {
             var result = _webView.ExecuteScript(_scriptTextbox.Text);
             Print($"IsSuccessful: {result.IsSuccessful} | Json: {result.Json}");
         }
         private void OnReloadButtonClick(ButtonClickEventArgs args)
         {
             _webView.ReloadAsync();
         }
         private void OnGoForwardButtonClick(ButtonClickEventArgs args)
         {
             _webView.GoForwardAsync();
         }
         private void OnGoBackButtonClick(ButtonClickEventArgs args)
         {
             _webView.GoBackAsync();
         }
         private void OnGoButtonClick(ButtonClickEventArgs args)
         {
             _webView.NavigateAsync(_addressTextBox.Text);
         }
         private void OnWebViewWebMessageReceived(WebViewWebMessageReceivedEventArgs args)
         {
             Print($"Source: {args.Source} | Message: {args.Message}");
         }
         private void OnWebViewNavigationCompleted(WebViewNavigationCompletedEventArgs args)
         {
             Print($"{args.HttpStatusCode} | {args.IsSuccessful} | {args.Url}");
             _addressTextBox.Text = args.Url;
             _scriptTextbox.IsEnabled = true;
             _executeScriptButton.IsEnabled = true;
         }
     }
 }

Methods

Summary

Navigate asynchronously to another URL.

Signature 

1
public void NavigateAsync(string url)

Parameters

Name Type Description
url string Target URL

Return Value

void

Summary

Initiates a navigation asynchronously to html content as source HTML of a new document.

Signature 

1
public void NavigateToStringAsync(string html)

Parameters

Name Type Description
html string HTML content

Return Value

void

GoBackAsync

Summary

Navigates asynchronously the WebView to the previous page in the navigation history.

Signature 

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public void GoBackAsync()

Return Value

void

GoForwardAsync

Summary

Navigates asynchronously the WebView to the next page in the navigation history.

Signature 

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public void GoForwardAsync()

Return Value

void

ReloadAsync

Summary

Reloads asynchronously the current page.

Signature 

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public void ReloadAsync()

Return Value

void

StopAsync

Summary

Stops asynchronously all navigations and pending resource fetches.

Signature 

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public void StopAsync()

Return Value

void

ExecuteScript

Summary

Executes JavaScript code from the javaScript parameter in the current top level document rendered in the WebViewand returns the result.You can only use this method after control is fully loaded and navigation is completed.

Signature 

1
public ExecuteScriptResult ExecuteScript(string javaScript)

Parameters

Name Type Description
javaScript string JavaScript code

Return Value

ExecuteScriptResult

ExecuteScriptAsync (2)

ExecuteScriptAsync (1 of 2)

Summary

Executes JavaScript code from the javaScript parameter in the current top level document rendered in the WebView.You can only use this method after control is fully loaded and navigation is completed.

Signature 

1
public void ExecuteScriptAsync(string javaScript)

Parameters

Name Type Description
javaScript string JavaScript code

Return Value

void

ExecuteScriptAsync (2 of 2)

Summary

Executes asynchronously JavaScript code from the javaScript parameter in the current top level document rendered inthe WebView.You can only use this method after control is fully loaded and navigation is completed.

Signature 

1
public void ExecuteScriptAsync(string javaScript, Action<ExecuteScriptResult> callback)

Parameters

Name Type Description
javaScript string JavaScript code
callback Action The callback that will be called after execution finished

Return Value

void

Properties

DefaultBackgroundColor

Summary

Default background color of WebView.

Signature 

1
public Color DefaultBackgroundColor {get; set;}

Return Value

Color

IsLoaded

Summary

Returns True if WebView is loaded otherwise False.

Signature 

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public bool IsLoaded {get;}

Return Value

bool

Events

Summary

Occurs when navigation of a page is completed.

Signature 

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public event Action<WebViewNavigationCompletedEventArgs> NavigationCompleted;

WebMessageReceived

Summary

Occurs after web content sends a message

Signature 

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public event Action<WebViewWebMessageReceivedEventArgs> WebMessageReceived;

Loaded

Summary

Occurs after web view is loaded

Signature 

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public event Action<WebViewLoadedEventArgs> Loaded;

Unloaded

Summary

Occurs after web view is unloaded

Signature 

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public event Action<WebViewUnloadedEventArgs> Unloaded;

Last update: September 29, 2023