With the below html file, that gets loaded into the document of a winform webBrowser, the functions and events in the scripts do not fire. When the winform displays, it only shows the button with id=paybutton (see form definition). It does not run the 1st script (window.YocoSDK etc) which references an online sdk (as in the src), and which adds a few more fields onto the form. This works in an online java test but not via c# winforms. Can anyone assist.
Secondly, the ShowMessage() function also does not fire on clicking the button.
My guess with both is that the inclusion of the online sdk in the "src" field is not happening.
HTMLPageSample.html file:
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript' src='https://js.yoco.com/sdk/v1/yoco-sdk-web.js'></script>
</head>
<body>
<form id='payform' method='POST' >
<div class='one-liner'>
<div id='card-frame'>
</div>
<button id='paybutton' onclick='ShowMessage()'>
PAY ZAR 2.00
</button>
</div>
<p class='success-payment-message' />
</form>
<script>
var sdk = new window.YocoSDK({
publicKey: 'pk_test_blahblah'
});
var inline = sdk.inline({
layout: 'field',
amountInCents: 2000,
currency: 'ZAR'
});
inline.mount('#card-frame');
</script>
<script>
function ShowMessage() {
var form = document.getElementById('payform');
var submitButton = document.getElementById('paybutton');
form.addEventListener('submit', function (event) {
event.preventDefault()
submitButton.disabled = true;
inline.createToken().then(function (result) {
submitButton.disabled = false;
if (result.error) {
const errorMessage = result.error.message;
errorMessage && alert('error occured: ' + errorMessage);
} else {
const token = result;
alert('card successfully tokenised: ' + token.id);
}
}).catch(function (error) {
submitButton.disabled = false;
alert('error occured: ' + error);
});
});
};
</script>
</body>
</html>
//c# code for the windows form
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace WindowsFormsApp1
{
[System.Runtime.InteropServices.ComVisibleAttribute(true)]
public partial class Form1 : Form
{
//Class example
//[ComVisible(true)]
public Form1()
{
InitializeComponent();
webBrowser1.ScriptErrorsSuppressed = true;
}
void Form1_Load(object sender, EventArgs e)
{
string path = System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(), #"..\..\");
//load the html into the webbrowser document. only the paybutton displays, the referenced library in "src" should call an online sdk that adds the payment fields to the form. these fields do not get added. so it seems the src reference is not working, or the script and form definitions cannot "see" each other?
webBrowser1.Navigate(System.IO.Path.Combine(path, "HTMLPageSample.html"));
}
void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
webBrowser1.ObjectForScripting = this;
}
private void button1_Click(object sender, EventArgs e)
{
//on button click, invoke the script that processes payment (does nothing)
webBrowser1.Document.InvokeScript("ShowMessage" );
}
private void button2_Click(object sender, EventArgs e)
{
//on button click, locate paybutton and invoke click method (does nothing)
foreach (HtmlElement element in webBrowser1.Document.All)
{
if (element.InnerText != null && element.InnerText.ToLower().StartsWith("pay zar"))
{
element.InvokeMember("click");
}
}
}
}
}
When using WebBrowser, it defaults to IE7, unless there is an entry in the registry.
If the process is running as 64-bit, the following registry keys are searched:
HKLM\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
HKCU\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
If the process is running as 32-bit, the following registry keys are searched:
HKLM\SOFTWARE\WOW6432Node\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
HKCU\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
Note: While different registry keys are searched in HKLM, when HKCU is searched, both 32-bit and 64-bit search the same subkey.
Here's a sample registry entry for a program named "MyApp.exe" that emulates IE11.
Below are step-by-step instructions that show how to run a JavaScript function when a button is clicked in C#. It uses a modified version of the HTML that's in the OP.
VS 2019:
Create a new project: Windows Forms App (.NET Framework) (name: WebBrowserTest)
Create a class (name: HelperRegistry.cs)
Note: The following code can be used to add the required entry in the registry when the Form loads. It's adapted from here.
HelperRegistry
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Win32;
using System.Diagnostics;
namespace WebBrowserTest
{
public enum BrowserEmulationVersion
{
Default = 0,
Version7 = 7000,
Version8 = 8000,
Version8Standards = 8888,
Version9 = 9000,
Version9Standards = 9999,
Version10 = 10000,
Version10Standards = 10001,
Version11 = 11000,
Version11Edge = 11001
};
public class HelperRegistry
{
public static BrowserEmulationVersion GetBrowserEmulationVersion()
{
//get browser emmulation version for this program (if it exists)
BrowserEmulationVersion result = BrowserEmulationVersion.Default;
try
{
string programName = System.IO.Path.GetFileName(Environment.GetCommandLineArgs()[0]);
object data = GetValueFromRegistry(RegistryHive.CurrentUser, #"Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION", programName);
if (data != null)
{
result = (BrowserEmulationVersion)Convert.ToInt32(data);
}
}
catch (System.Security.SecurityException ex)
{
// The user does not have the permissions required to read from the registry key.
LogMsg("Error: (GetBrowserEmulationVersion - SecurityException) - " + ex.Message);
}
catch (UnauthorizedAccessException ex)
{
// The user does not have the necessary registry rights.
LogMsg("Error: (GetBrowserEmulationVersion - UnauthorizedAccessException) - " + ex.Message);
}
catch (Exception ex)
{
LogMsg("Error: (GetBrowserEmulationVersion) - " + ex.Message);
}
return result;
}
public static int GetInternetExplorerMajorVersion()
{
//get IE version
int result = 0;
string version = string.Empty;
try
{
string programName = System.IO.Path.GetFileName(Environment.GetCommandLineArgs()[0]);
object data = GetValueFromRegistry(RegistryHive.LocalMachine, #"Software\Microsoft\Internet Explorer", "svcVersion");
if (data == null)
data = GetValueFromRegistry(RegistryHive.CurrentUser, #"Software\Microsoft\Internet Explorer", "Version");
if (data != null)
{
version = data.ToString();
int separator = version.IndexOf('.');
if (separator != -1)
{
int.TryParse(version.Substring(0, separator), out result);
}
}
}
catch (System.Security.SecurityException ex)
{
// The user does not have the permissions required to read from the registry key.
LogMsg("Error: (GetInternetExplorerMajorVersion - SecurityException) - " + ex.Message);
}
catch (UnauthorizedAccessException ex)
{
// The user does not have the necessary registry rights.
LogMsg("Error: (GetInternetExplorerMajorVersion - UnauthorizedAccessException) - " + ex.Message);
}
catch (Exception ex)
{
LogMsg("Error: (GetInternetExplorerMajorVersion) - " + ex.Message);
}
return result;
}
private static object GetValueFromRegistry(RegistryHive hive, string subkey, string regValue)
{
//if running as 64-bit, get value from 64-bit registry
//if running as 32-bit, get value from 32-bit registry
RegistryView rView = RegistryView.Registry64;
object data = null;
if (!Environment.Is64BitProcess)
{
//running as 32-bit
rView = RegistryView.Registry32;
}
using (RegistryKey regBaseKey = RegistryKey.OpenBaseKey(hive, rView))
{
using (RegistryKey sKey = regBaseKey.OpenSubKey(subkey))
{
if (sKey != null)
{
data = sKey.GetValue(regValue, null);
if (data != null)
{
LogMsg("data: " + data.ToString());
}
else
{
LogMsg("data is null (" + data + ")");
}
}
}
}
return data;
}
public static bool IsBrowserEmulationSet()
{
return GetBrowserEmulationVersion() != BrowserEmulationVersion.Default;
}
private static void LogMsg(string msg)
{
string logMsg = String.Format("{0} {1}", DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:fff"), msg);
System.Diagnostics.Debug.WriteLine(logMsg);
}
public static bool SetBrowserEmulationVersion()
{
BrowserEmulationVersion emulationCode;
int ieVersion = GetInternetExplorerMajorVersion();
if (ieVersion >= 11)
{
emulationCode = BrowserEmulationVersion.Version11;
}
else
{
switch (ieVersion)
{
case 10:
emulationCode = BrowserEmulationVersion.Version10;
break;
case 9:
emulationCode = BrowserEmulationVersion.Version9;
break;
case 8:
emulationCode = BrowserEmulationVersion.Version8;
break;
default:
emulationCode = BrowserEmulationVersion.Version7;
break;
}
}
return SetBrowserEmulationVersion(emulationCode);
}
public static bool SetBrowserEmulationVersion(BrowserEmulationVersion browserEmulationVersion)
{
bool result = false;
//if running as 64-bit, get value from 64-bit registry
//if running as 32-bit, get value from 32-bit registry
RegistryView rView = RegistryView.Registry64;
if (!Environment.Is64BitProcess)
{
//running as 32-bit
rView = RegistryView.Registry32;
}
try
{
string programName = System.IO.Path.GetFileName(Environment.GetCommandLineArgs()[0]);
using (RegistryKey regBaseKey = RegistryKey.OpenBaseKey(RegistryHive.CurrentUser, rView))
{
using (RegistryKey sKey = regBaseKey.OpenSubKey(#"Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION", true))
{
if (sKey != null)
{
if (browserEmulationVersion != BrowserEmulationVersion.Default)
{
// if it's a valid value, update or create the value
sKey.SetValue(programName, (int)browserEmulationVersion, Microsoft.Win32.RegistryValueKind.DWord);
}
else
{
// otherwise, remove the existing value
sKey.DeleteValue(programName, false);
}
result = true;
}
}
}
}
catch (System.Security.SecurityException ex)
{
// The user does not have the permissions required to read from the registry key.
LogMsg("Error: (SetBrowserEmulationVersion - SecurityException) - " + ex.Message);
}
catch (UnauthorizedAccessException ex)
{
// The user does not have the necessary registry rights.
LogMsg("Error: (SetBrowserEmulationVersion - UnauthorizedAccessException) - " + ex.Message);
}
catch (Exception ex)
{
LogMsg("Error: (SetBrowserEmulationVersion) - " + ex.Message);
}
return result;
}
}
}
In the Form "Load" event handler add the following:
HelperRegistry.SetBrowserEmulationVersion();
If desired, the HTML can be embedded in the program.
Open Solution Explorer
In VS menu, click View
Select Solution Explorer
Open Properties Window
In VS menu, click View
Select Properties Window
Create HTML folder
In Solution Explorer, right-click <solution name>
Select Add
Select New Folder (rename to desired name; ex: HTML)
Right-click the folder you just created (ex: HTML) and select Add
Select New Item...
Select HTML Page (name: HTMLPageSample.html)
Click Add
Note: If you don't see "HTML Page" as an option, you'll need to open Visual Studio Installer and add a workload that includes HTML.
Set Properties for HTMLPageSample.html
In Solution Explorer, click HTMLPageSample.html
In the Properties Window, set Build Action = Embedded Resource
HTMLPageSample.html
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript' src='https://js.yoco.com/sdk/v1/yoco-sdk-web.js'></script>
<script type="text/javascript">
var sdk = new window.YocoSDK({
publicKey: 'pk_test_blahblah'
});
var inline = sdk.inline({
layout: 'field',
amountInCents: 2000,
currency: 'ZAR'
});
inline.mount('#card-frame');
</script>
<script type="text/javascript">
function ShowMessage() {
try {
//alert('in ShowMessage...');
var form = document.getElementById('payform');
var submitButton = document.getElementById('paybutton');
form.addEventListener('submit', function (event) {
event.preventDefault()
submitButton.disabled = true;
inline.createToken().then(function (result) {
submitButton.disabled = false;
if (result.error) {
const errorMessage = result.error.message;
errorMessage && alert('error occured: ' + errorMessage);
} else {
const token = result;
alert('card successfully tokenised: ' + token.id);
}
}).catch(function (error) {
submitButton.disabled = false;
alert('error occured: ' + error);
});
});
}
catch (err) {
alert(err.message);
}
};
</script>
</head>
<body>
<form id='payform' method='POST'>
<div class='one-liner'>
<div id='card-frame'>
</div>
<button id='paybutton' onclick='ShowMessage()'>
PAY ZAR 2.00
</button>
</div>
<p class='success-payment-message' />
</form>
</body>
</html>
Now, we'll need some code to read the embedded HTML file. We'll use code from here.
Create a class (name: HelperLoadResource.cs)
HelperLoadResource
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Reflection;
using System.Diagnostics;
namespace WebBrowserTest
{
public static class HelperLoadResource
{
public static string ReadResource(string filename)
{
//use UTF8 encoding as the default encoding
return ReadResource(filename, Encoding.UTF8);
}
public static string ReadResource(string filename, Encoding fileEncoding)
{
string fqResourceName = string.Empty;
string result = string.Empty;
//get executing assembly
Assembly execAssembly = Assembly.GetExecutingAssembly();
//get resource names
string[] resourceNames = execAssembly.GetManifestResourceNames();
if (resourceNames != null && resourceNames.Length > 0)
{
foreach (string rName in resourceNames)
{
if (rName.EndsWith(filename))
{
//set value to 1st match
//if the same filename exists in different folders,
//the filename can be specified as <folder name>.<filename>
//or <namespace>.<folder name>.<filename>
fqResourceName = rName;
//exit loop
break;
}
}
//if not found, throw exception
if (String.IsNullOrEmpty(fqResourceName))
{
throw new Exception($"Resource '{filename}' not found.");
}
//get file text
using (Stream s = execAssembly.GetManifestResourceStream(fqResourceName))
{
using (StreamReader reader = new StreamReader(s, fileEncoding))
{
//get text
result = reader.ReadToEnd();
}
}
}
return result;
}
}
}
Usage:
string html = HelperLoadResource.ReadResource("HTMLPageSample.html");
Next, we'll work on our Form (name: Form1).
In Solution Explorer, right-click Form1.cs
Select View Designer
Open the Toolbox
In the VS menu, click View
Select Toolbox
Add WebBrowser to Form
In Toolbox, click on WebBrowser and drag it on top of the Form
Add Button to Form
In Toolbox, click on Button and drag it on top of the form
In the Properties Window, rename the button (name: btnSubmit)
Add Load event Handler to Form
In the Properties Window, click on
Double-click Load, to add the event handler
Whenever a page is loaded in the WebBrowser, either by using Navigate or by setting the DocumentText, it's important to wait until it is fully loaded. We'll create a method for the wait operation. I normally avoid using "DoEvents", but we'll use it this time.
private void WaitForBrowserToBeReady(int sleepTimeInMs = 125)
{
do
{
System.Threading.Thread.Sleep(sleepTimeInMs);
Application.DoEvents();
} while (webBrowser1.ReadyState != WebBrowserReadyState.Complete);
}
Now in Form1_Load, add the following code:
private void Form1_Load(object sender, EventArgs e)
{
//set browser emulation in registry
HelperRegistry.SetBrowserEmulationVersion();
//suppress script errors
webBrowser1.ScriptErrorsSuppressed = true;
//string path = System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(), #"..\..\");
//load the html into the webbrowser document. only the paybutton displays, the referenced library in "src"
//should call an online sdk that adds the payment fields to the form. these fields do not get added. so
//it seems the src reference is not working, or the script and form definitions cannot "see" each other?
//webBrowser1.Navigate(System.IO.Path.Combine(path, "HTMLPageSample.html"));
string html = HelperLoadResource.ReadResource("HTMLPageSample.html");
if (Environment.Is64BitProcess)
{
Debug.WriteLine("Running as 64-bit");
}
else
{
Debug.WriteLine("Running as 32-bit");
}
//initialize WebBrowser
webBrowser1.Navigate("about:blank");
WaitForBrowserToBeReady();
//set HTML
webBrowser1.DocumentText = html;
WaitForBrowserToBeReady();
//Debug.WriteLine(webBrowser1.DocumentText);
}
As stated in the OP, when the button is click it's desired that the ShowMessage() javascript function be called. Due to the way the JavaScript function is written, we'll do the following:
HtmlElementCollection col = webBrowser1.Document.GetElementsByTagName("button");
foreach (HtmlElement element in col)
{
if (element.GetAttribute("id").Equals("paybutton"))
{
element.InvokeMember("click"); // Invoke the "Click" member of the button
}
}
Note: While the following will also call ShowMessage(),
object result = webBrowser1.Document.InvokeScript("ShowMessage");
it won't give the desired result due to form.addEventListener('submit'... which requires a "click".
Here's the full code for Form1.cs.
Form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.Web.WebView2.Core;
using Microsoft.Web.WebView2.WinForms;
using System.Security.Permissions;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace WebBrowserTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
//set browser emulation in registry
HelperRegistry.SetBrowserEmulationVersion();
//suppress script errors
webBrowser1.ScriptErrorsSuppressed = true;
//string path = System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(), #"..\..\");
//load the html into the webbrowser document. only the paybutton displays, the referenced library in "src"
//should call an online sdk that adds the payment fields to the form. these fields do not get added. so
//it seems the src reference is not working, or the script and form definitions cannot "see" each other?
//webBrowser1.Navigate(System.IO.Path.Combine(path, "HTMLPageSample.html"));
string html = HelperLoadResource.ReadResource("HTMLPageSample.html");
if (Environment.Is64BitProcess)
{
Debug.WriteLine("Running as 64-bit");
}
else
{
Debug.WriteLine("Running as 32-bit");
}
//initialize WebBrowser
webBrowser1.Navigate("about:blank");
WaitForBrowserToBeReady();
//set HTML
webBrowser1.DocumentText = html;
WaitForBrowserToBeReady();
//Debug.WriteLine(webBrowser1.DocumentText);
}
private void LogMsg(string msg)
{
string logMsg = String.Format("{0} {1}", DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:fff"), msg);
System.Diagnostics.Debug.WriteLine(logMsg);
}
private void btnSubmit_Click(object sender, EventArgs e)
{
//object result = webBrowser1.Document.InvokeScript("ShowMessage", null);
//object result = webBrowser1.Document.InvokeScript("ShowMessage");
HtmlElementCollection col = webBrowser1.Document.GetElementsByTagName("button");
foreach (HtmlElement element in col)
{
if (element.GetAttribute("id").Equals("paybutton"))
{
element.InvokeMember("click"); // Invoke the "Click" member of the button
}
}
}
private void WaitForBrowserToBeReady(int sleepTimeInMs = 125)
{
do
{
System.Threading.Thread.Sleep(sleepTimeInMs);
Application.DoEvents();
} while (webBrowser1.ReadyState != WebBrowserReadyState.Complete);
}
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
}
}
}
Resources:
How to Click A Button Programmatically - Button in WebBrowser (IE)
Calling JavaScript functions in the Web Browser Control
Execute a JS function in WebBrowser C#
Configuring the Emulation Mode of an Internet Explorer WebBrowser Control
How to read embedded resource text file
C# WebBrowser control: window.external access sub object
Here's a version that uses WebView2. Below are step-by-step instructions that show how to run a JavaScript function when a button is clicked in C#. It uses a modified version of the HTML that's in the OP.
VS 2019:
Create a new project: Windows Forms App (.NET Framework) (name: WebView2SM)
If desired, the HTML can be embedded in the program.
Open Solution Explorer
In VS menu, click View
Select Solution Explorer
Open Properties Window
In VS menu, click View
Select Properties Window
Create HTML folder
In Solution Explorer, right-click <solution name>
Select Add
Select New Folder (rename to desired name; ex: HTML)
Right-click the folder you just created (ex: HTML) and select Add
Select New Item...
Select HTML Page (name: HTMLPageSample.html)
Click Add
Note: If you don't see "HTML Page" as an option, you'll need to open Visual Studio Installer and add a workload that includes HTML.
Set Properties for HTMLPageSample.html
In Solution Explorer, click HTMLPageSample.html
In the Properties Window, set Build Action = Embedded Resource
HTMLPageSample.html
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript' src='https://js.yoco.com/sdk/v1/yoco-sdk-web.js'></script>
<script type="text/javascript">
var sdk = new window.YocoSDK({
publicKey: 'pk_test_blahblah'
});
var inline = sdk.inline({
layout: 'field',
amountInCents: 2000,
currency: 'ZAR'
});
inline.mount('#card-frame');
</script>
<script type="text/javascript">
function ShowMessage() {
try {
//alert('in ShowMessage...');
var form = document.getElementById('payform');
var submitButton = document.getElementById('paybutton');
form.addEventListener('submit', function (event) {
event.preventDefault()
submitButton.disabled = true;
inline.createToken().then(function (result) {
submitButton.disabled = false;
if (result.error) {
const errorMessage = result.error.message;
errorMessage && alert('error occured: ' + errorMessage);
} else {
const token = result;
alert('card successfully tokenised: ' + token.id);
}
}).catch(function (error) {
submitButton.disabled = false;
alert('error occured: ' + error);
});
});
}
catch (err) {
alert(err.message);
}
};
</script>
</head>
<body>
<form id='payform' method='POST'>
<div class='one-liner'>
<div id='card-frame'>
</div>
<button id='paybutton' onclick='ShowMessage()'>
PAY ZAR 2.00
</button>
</div>
<p class='success-payment-message' />
</form>
</body>
</html>
Now, we'll need some code to read the embedded HTML file. We'll use code from here.
Create a class (name: HelperLoadResource.cs)
HelperLoadResource
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Reflection;
using System.Diagnostics;
namespace WebView2SM
{
public static class HelperLoadResource
{
public static string ReadResource(string filename)
{
//use UTF8 encoding as the default encoding
return ReadResource(filename, Encoding.UTF8);
}
public static string ReadResource(string filename, Encoding fileEncoding)
{
string fqResourceName = string.Empty;
string result = string.Empty;
//get executing assembly
Assembly execAssembly = Assembly.GetExecutingAssembly();
//get resource names
string[] resourceNames = execAssembly.GetManifestResourceNames();
if (resourceNames != null && resourceNames.Length > 0)
{
foreach (string rName in resourceNames)
{
if (rName.EndsWith(filename))
{
//set value to 1st match
//if the same filename exists in different folders,
//the filename can be specified as <folder name>.<filename>
//or <namespace>.<folder name>.<filename>
fqResourceName = rName;
//exit loop
break;
}
}
//if not found, throw exception
if (String.IsNullOrEmpty(fqResourceName))
{
throw new Exception($"Resource '{filename}' not found.");
}
//get file text
using (Stream s = execAssembly.GetManifestResourceStream(fqResourceName))
{
using (StreamReader reader = new StreamReader(s, fileEncoding))
{
//get text
result = reader.ReadToEnd();
}
}
}
return result;
}
}
}
Usage:
string html = HelperLoadResource.ReadResource("HTMLPageSample.html");
Change/Verify NuGet Package Manager Settings (optional for .NET Framework; required for .NET)
In VS menu, click Tools
Select Options
Double-click NuGet Package Manager
Under "Package Management", set Default package management format: PackageReference
Click OK
See the following for more information:
Package references (PackageReference) in project files
Migrate from packages.config to PackageReference
Add WebView2 NuGet package
In Solution Explorer, right-click <solution name> (ex: WebView2SM)
Select Manage NuGet packages...
Click Browse
Optional: check Include prerelease box next to the search box
In search box, type: Microsoft.Web.WebView2
Select the desired version
Click Install
If you see a pop-up, click OK
Note: To add WebView2 to just the project, instead of the solution, right-click <project name> instead of <solution name>.
Next, we'll work on our Form (name: Form1).
In Solution Explorer, right-click Form1.cs
Select View Designer
Open the Toolbox
In the VS menu, click View
Select Toolbox
Add WebView2 to Form
In Toolbox, click on WebView2 Windows Control Form to expand it
Click on WebView2 and drag it on top of the Form
Resize the WebView2 control as desired
Add Button to Form
In Toolbox, click on Button and drag it on top of the form
In the Properties Window, rename the button (name: btnSubmit)
In the Properties Window, click
Double-click Click, to add the event handler
Add Load event Handler to Form
In the Properties Window, click
Double-click Load, to add the event handler
Add CoreWebView2InitializationCompleted event handler
In Solution Explorer, right-click Form1.cs
Select View Designer
In Properties Window, click
Click on the drop-down and select the WebView2 control (ex: webView21)
Double-click CoreWebView2InitializationCompleted
Optional: double-click NavigationCompleted (repeat for any other desired event handlers)
Now, it's we'll work on the code for the Form.
In Solution Explorer, right-click Form1.cs
Select View Code
For testing, we'll add a method named LogMsg.
private void LogMsg(string msg)
{
string logMsg = String.Format("{0} {1}", DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:fff"), msg);
System.Diagnostics.Debug.WriteLine(logMsg);
}
This method can be modified as desired. If desired, one could write the information to a log file. If you already have a method for logging, you can use that instead. I've included this one, because it's used in the code.
In order to set the desired location for the web cache that will be created, we'll explicitly initialize WebView2. We'll call it InitializeCoreWebView2Async. We'll also create a method that can be used to add code using AddScriptToExecuteOnDocumentCreatedAsync.
Note: It's necessary to use async when using await. Notice the use of Task instead of void. If void is used, execution will continue without waiting.
AddScriptToExecuteOnDocumentCreatedAsync
private async Task AddExecuteOnDocumentCreatedAsyncCode()
{
if (webView21 != null && webView21.CoreWebView2 != null)
{
string jsCode = string.Empty;
//ToDo: add desired code using 'AddScriptToExecuteOnDocumentCreatedAsync'
if (!String.IsNullOrEmpty(jsCode))
{
await webView21.CoreWebView2.AddScriptToExecuteOnDocumentCreatedAsync(jsCode);
}
}
}
InitializeCoreWebView2Async
public async Task InitializeCoreWebView2Async(WebView2 wv, string webCacheDir = "")
{
CoreWebView2EnvironmentOptions options = null;
string tempWebCacheDir = string.Empty;
CoreWebView2Environment webView2Environment = null;
//set value
tempWebCacheDir = webCacheDir;
if (String.IsNullOrEmpty(tempWebCacheDir))
{
//use temp folder
//get fully-qualified path to user's temp folder
tempWebCacheDir = System.IO.Path.GetTempPath();
//create a randomly named folder - this will create a new web cache folder each time
//creating a new web cache folder takes time. By re-using an existing web cache,
//the load time will be shorter. However, one may need to manage (clean-up)
//objects in the web cache that are no longer needed
//tempWebCacheDir = System.IO.Path.Combine(tempWebCacheDir, System.Guid.NewGuid().ToString("N"));
}
//webView2Environment = await CoreWebView2Environment.CreateAsync(#"C:\Program Files (x86)\Microsoft\Edge Dev\Application\1.0.902.49", tempWebCacheDir, options);
webView2Environment = await CoreWebView2Environment.CreateAsync(null, tempWebCacheDir, options);
//wait for CoreWebView2 initialization
await wv.EnsureCoreWebView2Async(webView2Environment);
//add desired code using AddScriptToExecuteOnDocumentCreatedAsync
await AddExecuteOnDocumentCreatedAsyncCode();
LogMsg("Info: Cache data folder set to: " + tempWebCacheDir);
}
Usage:
await InitializeCoreWebView2Async(webView21);
Now in Form1_Load, add the following code:
private async void Form1_Load(object sender, EventArgs e)
{
//initialize
await InitializeCoreWebView2Async(webView21);
string html = HelperLoadResource.ReadResource("HTMLPageSample.html");
webView21.NavigateToString(html);
}
Once WebView2 initialization is completed, we'll add any desired event handlers for CoreWebView2. We'll add them in CoreWebView2InitializationCompleted.
private void webView21_CoreWebView2InitializationCompleted(object sender, Microsoft.Web.WebView2.Core.CoreWebView2InitializationCompletedEventArgs e)
{
//subscribe to events (add event handlers)
webView21.CoreWebView2.DOMContentLoaded += CoreWebView2_DOMContentLoaded;
}
Note: Don't place any code in the event handler that could cause "blocking".
As stated in the OP, when the button is click it's desired that the ShowMessage() javascript function be called. Due to the way the JavaScript function is written, we'll do the following:
var result = await webView21.CoreWebView2.ExecuteScriptAsync("document.getElementById('paybutton').click();");
Note: While the following will also call ShowMessage(),
var result = await webView21.CoreWebView2.ExecuteScriptAsync("ShowMessage();");
it won't give the desired result due to form.addEventListener('submit'... which requires a "click".
Here's the full code for Form1.cs.
Form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.Web.WebView2.Core;
using Microsoft.Web.WebView2.WinForms;
namespace WebView2SM
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private async void Form1_Load(object sender, EventArgs e)
{
//initialize
await InitializeCoreWebView2Async(webView21);
string html = HelperLoadResource.ReadResource("HTMLPageSample.html");
webView21.NavigateToString(html);
}
private async Task AddExecuteOnDocumentCreatedAsyncCode()
{
if (webView21 != null && webView21.CoreWebView2 != null)
{
string jsCode = string.Empty;
//ToDo: add desired code using 'AddScriptToExecuteOnDocumentCreatedAsync'
if (!String.IsNullOrEmpty(jsCode))
{
await webView21.CoreWebView2.AddScriptToExecuteOnDocumentCreatedAsync(jsCode);
}
}
}
private async Task InitializeCoreWebView2Async()
{
//initialize CorewWebView2
await webView21.EnsureCoreWebView2Async();
//add desired code using AddScriptToExecuteOnDocumentCreatedAsync
await AddExecuteOnDocumentCreatedAsyncCode();
}
public async Task InitializeCoreWebView2Async(WebView2 wv, string webCacheDir = "")
{
CoreWebView2EnvironmentOptions options = null;
string tempWebCacheDir = string.Empty;
CoreWebView2Environment webView2Environment = null;
//set value
tempWebCacheDir = webCacheDir;
if (String.IsNullOrEmpty(tempWebCacheDir))
{
//use temp folder
//get fully-qualified path to user's temp folder
tempWebCacheDir = System.IO.Path.GetTempPath();
//create a randomly named folder - this will create a new web cache folder each time
//creating a new web cache folder takes time. By re-using an existing web cache,
//the load time will be shorter. However, one may need to manage (clean-up)
//objects in the web cache that are no longer needed
//tempWebCacheDir = System.IO.Path.Combine(tempWebCacheDir, System.Guid.NewGuid().ToString("N"));
}
//webView2Environment = await CoreWebView2Environment.CreateAsync(#"C:\Program Files (x86)\Microsoft\Edge Dev\Application\1.0.902.49", tempWebCacheDir, options);
webView2Environment = await CoreWebView2Environment.CreateAsync(null, tempWebCacheDir, options);
//wait for CoreWebView2 initialization
await wv.EnsureCoreWebView2Async(webView2Environment);
//add desired code using AddScriptToExecuteOnDocumentCreatedAsync
await AddExecuteOnDocumentCreatedAsyncCode();
LogMsg("Info: Cache data folder set to: " + tempWebCacheDir);
}
private void LogMsg(string msg)
{
string logMsg = String.Format("{0} {1}", DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:fff"), msg);
System.Diagnostics.Debug.WriteLine(logMsg);
}
private void webView21_CoreWebView2InitializationCompleted(object sender, Microsoft.Web.WebView2.Core.CoreWebView2InitializationCompletedEventArgs e)
{
//subscribe to events (add event handlers)
webView21.CoreWebView2.DOMContentLoaded += CoreWebView2_DOMContentLoaded;
}
private void CoreWebView2_DOMContentLoaded(object sender, Microsoft.Web.WebView2.Core.CoreWebView2DOMContentLoadedEventArgs e)
{
}
private void webView21_NavigationCompleted(object sender, Microsoft.Web.WebView2.Core.CoreWebView2NavigationCompletedEventArgs e)
{
}
private async void btnSubmit_Click(object sender, EventArgs e)
{
//var result = await webView21.CoreWebView2.ExecuteScriptAsync("ShowMessage();");
var result = await webView21.CoreWebView2.ExecuteScriptAsync("document.getElementById('paybutton').click();");
}
}
}
Resources
Introduction to Microsoft Edge WebView2
Release notes for WebView2 SDK
Understand WebView2 SDK versions
Report An Issue With WebView2
Distribution of apps using WebView2
Get started with WebView2 in Windows Forms
Download the WebView2 Runtime
What is .NET Framework?
Introduction to .NET
.NET Core/5+ vs. .NET Framework for server apps
I am trying to add a JS script file called chatfunction.js into my index.html in Blazor but it gives me an error that it cannot find a file. My CSS is linked correctly and the HTML and CSS both show up but it does not provide any of the JS functionality that I have implemented.
I am adding it at the bottom of my HTML in index.html like this:
....
<script src="_framework/blazor.webassembly.js"></script>
<script src="chatfunction.js"></script>
</body>
</html>
Here is my project structure
Now when I try compiling it gives me this error:
(JS) File 'C:/Users/darka/source/repos/chatproject/wwwroot/js/mysrc.js' not found.
I don't get why it can't find it and I am confused as to why it thinks my file is mysrc.js as there is no file like that in my project structure.
Any pointers how to fix this?
Here is the layout of my JS file
var botController = (function () {
})();
var uiController = (function () {
})();
var controller = (function (botCntr, uiCntr) {
var $chatCircle,
$chatBox,
$chatBoxClose,
$chatBoxWelcome,
$chatWraper,
$submitBtn,
$chatInput,
$msg;
/*toggle*/
function hideCircle(evt) {
evt.preventDefault();
$chatCircle.hide('scale');
$chatBox.show('scale');
$chatBoxWelcome.show('scale');
}
function chatBoxCl(evt) {
evt.preventDefault();
$chatCircle.show('scale');
$chatBox.hide('scale');
$chatBoxWelcome.hide('scale');
$chatWraper.hide('scale');
}
function chatOpenMessage(evt) {
evt.preventDefault();
$chatBoxWelcome.hide();
$chatWraper.show();
}
//generate messages on submit click
function submitMsg(evt) {
evt.preventDefault();
//1. get input message data
msg = $chatSubmitBtn.val();
//2.if there is no string button send shoudn't work
if (msg.trim() == '') {
return false;
}
//3. add message to bot controller
callbot(msg);
//4. display message to ui controller
generate_message(msg, 'self');
}
function chatSbmBtn(evt) {
if (evt.keyCode === 13 || evt.which === 13) {
console.log("btn pushed");
}
}
/* var input = uiCntr.getInput();*/
/* $chatSubmitBtn.on("click", hideCircle);*/
function init() {
$chatCircle = $("#chat-circle");
$chatBox = $(".chat-box");
$chatBoxClose = $(".chat-box-toggle");
$chatBoxWelcome = $(".chat-box-welcome__header");
$chatWraper = $("#chat-box__wraper");
$chatInput = $("#chat-input__text");
$submitBtn = $("#chat-submit");
//1. call toggle
$chatCircle.on("click", hideCircle);
$chatBoxClose.on("click", chatBoxCl);
$chatInput.on("click", chatOpenMessage);
//2. call wait message from CRM-human
$submitBtn.on("click", chatSbmBtn);
$chatInput.on("keypress", chatSbmBtn);
//6. get message from bot controller-back end
//7. display bot message to ui controller
}
return {
init: init
};
})(botController, uiController);
$('.chat-input__form').on('submit', function (e) {
e.preventDefault();
msg = $('.chat-input__text').val();
$('.chat-logs').append('<div id="cm-msg-0" class="chat-msg background-warning push-right bot"><div class="cm-msg-text">' + msg + '</div><span class="msg-avatar"><img class="chat-box-overlay_robot" src="https://www.meetsource.com//userStyles/images/user.png"></span></div>');
$('.chat-input__text').val('');
});
$(document).ready(controller.init);
function talk() {
var user = document.getElementById("userBox").value;
document.getElementById("userBox").value = "";
document.getElementById("chatLog").innerHTML += user + "<br>";
}
I think your script line needs to be:
<script src="js/chatfunction.js"></script>
i am developing uwp app (win 10) by c#
i want put my website in xaml webview element.
most of function are workable.
but i can't handle the confirm dialog
for example
this is sample html & js code
<button id="btnConfirm" onclick="confirmBox('sure to delete?')">click me to confirm</button>
<button id="btnAlert" onclick="alert('alert message')">click me to alert</button>
<script type="text/javascript">
function confirmBox(message) {
if (confirm(message)) {
alert("yes");
} else {
alert("no");
}
}
</script>
this is my xaml code
<WebView Grid.Row="1" x:Name="webView1" Source="ms-appx-web:///HTMLPage1.html" Width="auto" Height="auto"/>
this is my C# code
webView1.ScriptNotify += webView1_ScriptNotify;
webView1.NavigationCompleted += webView1_NavigationCompleted;
async void webView1_NavigationCompleted(WebView sender, WebViewNavigationCompletedEventArgs args)
{
await webView1.InvokeScriptAsync("eval", new string[] { "window.confirm = function(confirmMessage) { window.external.notify('typeConfirm:' + confirmMessage) }" });
await webView1.InvokeScriptAsync("eval", new string[] { "window.alert = function(AlertMessage) { window.external.notify('typeAlert:' + AlertMessage) }" });
}
private async void webView1_ScriptNotify(object sender, NotifyEventArgs e)
{
Windows.UI.Popups.MessageDialog dialog;
string[] messageArray = e.Value.Split(':');
string message;
string type;
if (messageArray.Length > 1)
{
message = messageArray[1];
type = messageArray[0];
}
else
{
message = e.Value;
type = "typeAlert";
}
dialog = new Windows.UI.Popups.MessageDialog(message);
Debug.WriteLine("type=" + type + " ,message=" + message);
if (type.Equals("typeConfirm"))
{
dialog.Commands.Add(new UICommand(
"Yes",
new UICommandInvokedHandler(this.CommandInvokedHandler)));
dialog.Commands.Add(new UICommand(
"Cancel",
new UICommandInvokedHandler(this.CommandInvokedHandler)));
dialog.DefaultCommandIndex = 0;
dialog.CancelCommandIndex = 1;
}
var result = await dialog.ShowAsync();
if (result.Label.Equals("Yes"))
{
// return true;
}
else
{
// return false
}
}
the problem is that confirm js function will always return false
before user clicked the yes or no.
i can get user choosed button. but it's too late.
js function "confirm" will never return true in this situation.
anyone can help me?
thanks.
This will not work. JS runs on single thread, and will not wait for the result of the c# call. So the alert will not wait for the result from the MessageDialog.
Please note that webview in winrt project more suitable for displaying some static html. If you do want to pop up a MessageDialog act as a confirm dialog, then you need to complete all rest work that you previous do in javascript in your c# code.
For example, if you want to change some text of a html control, you need to prepare a complete html string, then check command status in CommandInvokedHandler callback and let webview navigate to(webView.NavigateToString) the new html string.
If you need to receive notifications and data in your app code sent from WebView-hosted script, you need to handle the ScriptNotify event. You can refer to this sample (The scenario6).
I am having a wizardcontrol, where in one step the user can input his name, emailaddress, phonenumber etc.
When the user press the "Next" button of the wizard, I'm checking the database to see if there is an excisting account with the specified phonenumber.
If that is the case, the system is supposed to ask the user if he will bind the new information to that number, or if he will enter a new phonenumber.
If he says that he will bind the information, the information is binded and wizard proceeds to step2, and if he will enter a new phonenumber the wizard stays at step1.
The code looks something like this:
protected void Wizard1_NextButtonClick(object sender, WizardNavigationEventArgs e)
{
if (Wizard1.ActiveStepIndex == 0)
{
Page.Validate();
if (Page.IsValid)
{
if (!Mobile_ValidateForExistingUsers(((TextBox)WizardStep1.ContentTemplateContainer.FindControl("txtPhone")).Text))
{
//JavaScript popup or something, which prompts the user?
}
}
}
}
where the validater is:
protected bool Mobile_ValidateForExistingUsers(string usrPhone)
{
bool IsValid = false;
using (SqlConnection conn = new SqlConnection(connString))
using (SqlCommand cmd = new SqlCommand("spCheckMobile", conn))
{
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("#Mobile", usrPhone));
cmd.Connection.Open();
object result = cmd.ExecuteScalar();
if (result == null)
{
IsValid = true;
}
}
return IsValid;
}
How to ask the user this question, and either proceed or let him enter some new information in a wizard?
I think the most effective way to handle this would be to make the Mobile_ValidateForExistingUsers(phoneNumber) function a WebMethod for an AJAX call. Once you write the AJAX code, attach the AJAX call to a <asp:CustomValidator> for its client-side validation function and if it returns false, follow up with your window.alert('use new number').
Alternatively, you can handle most of this through server-side code by using a <asp:CustomValidator>, although there's no need to set a client-side validation function if you're handling the validation server-side. Simply set the CustomValidator1.IsValid property to the results of the Mobile_ValidateForExistingUsers(phoneNumber) function and then call Page.Validate() to see if the page is still valid. If not, flag a runat="server" hidden input and have some client-side code prompt the user on window.onload and if they want to use the new number, store that in a second hidden field. Example follows:
protected void Wizard1_NextButtonClick(object sender, WizardNavigationEventArgs e)
{
if (Wizard1.ActiveStepIndex == 0)
{
Page.Validate();
if (Page.IsValid)
{
if (HiddenField2.Value == '') //Client-side Flag not set
{
if (!Mobile_ValidateForExistingUsers(((TextBox)WizardStep1.ContentTemplateContainer.FindControl("txtPhone")).Text))
{
CustomValidator1.IsValid = false; // Invalidate the page so the Next Step fails.
HiddenField1.Value = false; // Page will get re-rendered to client to fix errors and stay on the same step.
}
}
else
{
if (HiddenField2.Value == 'true')
{
// Use new binding logic.
}
else
{
//User does not want to use new number, so logic to handle goes here.
}
}
}
}
}
And then somewhere in the client-side markup:
/*
* Crude example
*/
<script type="text/javascript">
window.onload = function () {
'use strict';
var hf1 = document.getElementById('<%=HiddenField1.ClientID %>');
var hf2 = document.getElementById('<%=HiddenField2.ClientID %>');
var myForm = document.getElementById('<%=Form1.ClientID %>');
if (hf1.value === 'false') { // or if (hf1.value) if you just want the truthiness of the value's existence (depending on how you flag stuff)
hf2.value = window.confirm('Wanna use this number?').toString().toLowerCase();
}
myForm.submit();
}
</script>
Hope this helps,
Pete