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'm having an issue with the functions to be called not firing off.
I have moved from hardcoding the buttons on HTML, to using the add controls method in the cs; and I have shifted from using Button and HtmlButton to using LinkButton. However none of these seem to work. In Onserverclick and onclick not work Anup Sharma recommends using the LinkButton, and Keyvan Sadralodabai indicates that if the runat="server" is displayed in the insect element, then he control was set up wrong.
So here's a stripped down simplified version of what I'm working with:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Web.Services;
using System.Data;
using MySql.Data;
using MySql.Data.MySqlClient;
public partial class backCodeExper : System.Web.UI.Page
{
protected void saveRecord(string recordID, string buttonId, string dropdownId)
{
PlaceHolder db = Page.FindControl("TestingCS") as PlaceHolder;
HtmlTable tbl = db.FindControl("TestTable") as HtmlTable;
HtmlTableRow tr = tbl.FindControl("TheRow") as HtmlTableRow;
HtmlTableCell tc = tr.FindControl("TheCell2") as HtmlTableCell;
DropDownList ddl = tc.FindControl(dropdownId) as DropDownList;
var status = ddl.SelectedValue.ToString();
HttpContext context = HttpContext.Current;
MySqlConnection conn = new MySqlConnection();
conn.ConnectionString = "Server=localhost; Database********; User=********; Password=********; Port=3306";
conn.Open();
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "updatetesttable";
cmd.Parameters.AddWithValue("#param", status);
cmd.ExecuteNonQuery();
}
protected void Page_Load(object sender, EventArgs e)
{
HtmlTable myTable = new HtmlTable();
myTable.ID = "TestTable";
myTable.BorderColor = "teal";
myTable.BgColor = "black";
TestingCS.Controls.Add(myTable);
HtmlTableRow newRow;
HtmlTableCell cell;
DropDownList DropList;
LinkButton saveButton;
newRow = new HtmlTableRow();
newRow.ID = "TheRow";
cell = new HtmlTableCell();
cell.ID = "TheCell1";
DropList = new DropDownList();
DropList.ID = "StatusDD";
DropList.Items.Add(new ListItem("", "0"));
DropList.Items.Add(new ListItem("A", "1"));
DropList.Items.Add(new ListItem("B", "2"));
DropList.Items.Add(new ListItem("C", "3"));
cell.Controls.Add(DropList);
newRow.Cells.Add(cell);
cell = new HtmlTableCell();
cell.ID = "TheCell2";
cell.BgColor = "black";
saveButton = new LinkButton();
saveButton.ID = "saveButton";
saveButton.CommandName = "saveRecord";
saveButton.CommandArgument = "'1A',this.id,'StatusDD'";
saveButton.BackColor=Color.Green;
saveButton.ForeColor=Color.Cyan;
saveButton.BorderColor=Color.Maroon;
saveButton.Text = "Save";
saveButton.Visible = true;
cell.Controls.Add(saveButton);
newRow.Cells.Add(cell);
myTable.Rows.Add(newRow);
}
}
It loads the screen just fine with the simple dropdown and with the (unstylish) button (frankly the HtmlButton looks much nicer, but I'm aiming for functionality first).
When I select an item from the dropdown and then click save, the screen appears to refresh, keeping the value of the dropdown the same as that which was selected. However, when I check the database, the procedure hasn't fired. Additionally I cannot get this code segment Response.Write("<script>alert('Hello');</script>"); to execute when placed in the method/function saveRecord.
Furthermore, when I run the debugging mode and put break points in saveRecord, none of them are hit.
After inspecting element, this is what I get:
InspectElementResults
Any suggestions? What am I missing?
If I don't use LinkButton (or Button/HtmlButton with onServerClick) then I get errors saying the function isn't defined - which makes since as the function/method is define on the aspx.cs not the aspx within JS script tags.
I've got it figured out. At least, it is functional.
I was trying to set the function to pass the values I want in the format I wanted, but apparently the when you set up a LinkButton, it prefers the object and Event Args as parameters, and the object is the ListButton itself, so if that ListButton object holds the values you need in its attributes, then when the function is called you parse out the attributes you need. There's likely a better way than to assign the two values I need to CommandName and CommandArgument, but this works. (I had thought of using .Attributes.Add("ROW_ID","1a") and .Attributes.Add("DD_ID","StatusDD") ... but couldn't initially figure out how to retrieve those values from the sender object...to be investigated later, in the meantime, rolling forward with a functional solution.
...
protected void saveRecord(object sender, EventArgs e)
{
LinkButton lb = (LinkButton)sender;
string ROW_ID = (string)lb.CommandName;
string DD_ID = (string)lb.CommandArgument;
Response.Write("<script>alert('Hello');</script>");
...
}
protected void Page_Load(object sender, EventArgs e)
{
...
saveButton.CommandName = "1a";
saveButton.CommandArgument = "StatusDD";
saveButton.Click += new EventHandler(saveRecord);
...
}
}
I am currently working on inserting a Digital Signature (DS) to pdf documents using IText API Java. I am able to attach DS in pdf documents but my requirement is I want to insert DS at the location of placeholder(string). I tried many ways but nothing is working. Does anybody know how to implement the same...?
I tried another way of doing the same by adding a text field to pdf and attaching a DS inside text field using text field name. But again the problem is I am not able to add a Text field at the place of String. How to add a text field in pdf at a required location...?(i.e I want to replace a string with text field) is this possible...?.Does anybody know how new Rectangle() can be created in java at the location of placeholder (String or text).
Create class TextRenderInfoObject with fields as
private String text;
private TextRenderInfo line;
add all constructors, getters and setters.
To get the Co-Ordinates of Text (Placeholder)
PdfReader reader = new PdfReader(byteArrayOutputStream.toByteArray());
List<TextRenderInfoObject> textRenderInfos = new ArrayList<>();
PdfReaderContentParser parser = new PdfReaderContentParser(reader);
parser.processContent(pageNumber, new TextMarginFinder()
{
#Override
public void renderText(TextRenderInfo renderInfo)
{
if("dstext".contains(renderInfo.getText()))
{
textRenderInfos.add(new TextRenderInfoObject(
renderInfo.getText(), renderInfo));
}
}
}
Rectangle2D.Float line;
for (TextRenderInfoObject textRenderInfo : textRenderInfos)
{
if (textRenderInfo.getText().equals("dstext"))
line = textRenderInfo.getLine().getBaseline().getBoundingRectange());
}
Creating form field in pdf
PdfReader pdfReader = new PdfReader(byteArrayOutputStream.toByteArray());
PdfStamper stamper = new PdfStamper(pdfReader, byteArrayOutputStream);
PdfFormField field = PdfFormField.createSignature(stamper.getWriter());
field.setFieldName("Digital Signature");
field.setWidget(new Rectangle(line.x, line.y, line.x + line.width, line.y - line.height), PdfAnnotation.HIGHLIGHT_OUTLINE);
field.setFlags(PdfAnnotation.FLAGS_PRINT);
field.setColor(BaseColor.WHITE);
field.setMKBorderColor(BaseColor.BLACK);
stamper.addAnnotation(field, pageNumber);
stamper.close();
I recently want to make auto-typing, auto-fill Explorer browser, using Windows program with c#.net programming.
I can auto type in text type but I cannot autotype the 'select tag'.
I searched and I think I can use 'setAttribute("value","selectIndexnumber")'
but, I didn't work well. Explorer does not perceive the 'change' state.
So first, I used IHTMLElement3.FireEvent("onchange",null); to invoke 'onchange'
but it didn't work, too.
and Secondely, I used SendKeys.Send("{TAB}");
but it didn't work, too.
how can I autofill the 'select tag' well with no problem like user change the select tag?
please help me. thanks in advance!
below is the code that i wrote.
private void button3_Click(object sender, EventArgs e)
{
SHDocVw.InternetExplorer browser;
SHDocVw.ShellWindows shellWindows = new SHDocVw.ShellWindows();
string filename;
MessageBox.Show("shellWindows number is " + shellWindows.Count);
foreach (SHDocVw.InternetExplorer ie in shellWindows)
{
filename = System.IO.Path.GetFileNameWithoutExtension(ie.FullName).ToLower();
if ((filename == "iexplore"))
{
browser = ie;
String myDocURL = browser.Document.url;
MessageBox.Show("this is url" + myDocURL);
if (myDocURL == "https://hankooktire.recruiter.co.kr/app/applicant/modifyResume")
{
IHTMLDocument3 ihtml3doc = (IHTMLDocument3)browser.Document;
IHTMLElement3 ihtml3ele = ihtml3doc.getElementById("jobnoticeSn") as IHTMLElement3;
IHTMLElement ihtmlele = ihtml3doc.getElementById("jobnoticeSn");
ihtmlele.setAttribute("value", "4");
IHTMLSelectElement selEle = ihtml3ele as IHTMLSelectElement;
//selEle.selectedIndex=4;
SendKeys.Send("{TAB}");
ihtml3ele.FireEvent("onchange", null);
//SendKeys.Send("{TAB}");
ihtml3doc.getElementById("jobnoticeSn").children(4).setAttribute("selected", "true");
SendKeys.Send("{TAB}");
//ihtml3doc.getElementById("jobnoticeSn").children(4).setAttribute("checked", "true");
//ihtml3doc.getElementById("jobnoticeSn").children(4).setAttribute("selectedIndex", "true");
//ihtml3doc.getElementById("jobnoticeSn").setAttribute("selected", "selected");
//ihtml3doc.getElementById("jobnoticeSn").setAttribute("value", "8130");
ihtml3doc.getElementById("name").setAttribute("value", "김준혁");
ihtml3doc.getElementById("birthday").setAttribute("value", "1989-11-18");
ihtml3doc.getElementById("man").setAttribute("checked", "true");
ihtml3doc.getElementById("email").setAttribute("value", "jjunest#gmail.com");
ihtml3doc.getElementById("password").setAttribute("value", "emfla248248");
//ihtml3doc.getElementById("password").scrollIntoView();
}
}
}
}
I currently have a listbox (part of a search criteria) that represents a list of strings that are retrieved one at a time via a pop-up window. However when the pop-up window closes the selected String is never added to the listbox. (I have confirmed that the hidden variable is updated and if you navigate away from the page after a search is performed and navigate back, the list box correctly shows Strings I had selected from the pop up previously). Any help would be greatly appreciated!
<script type="text/javascript">
function selectBook(bookId, extendedBookName) {
var idInput = jQuery("#myForm\\:bookNames");
if (idInput.val() == "") {
idInput.val(extendedBookName);
} else {
idInput.val(idInput.val() + '###' + extendedBookName);
}
}
</script>
...
<h:form id="myForm">
...
<ui:define name="form-fields">
<h:selectOneListbox id="booksListBox" size="3" style="width:470px">
<s:selectItems var="_var" value="#{bean.searchCriteria.bookNames}" label="#{_var}" noSelectionLabel="" />
</h:selectOneListbox>
<h:outputLink onclick="return openNewWindow('#{bean.booksLookupUrl}?#{bean.bookLookupParameters}', 'book');"
target="_blank">
<h:inputHidden id="bookNames" value="#{bean.searchCriteria.bookNames}" converter="StringListConverter"/>
<h:outputText value="Add"/>
</h:outputLink>
</ui:define>
...
</h:form>
This is javaScript that belongs to the lookup window. This calls the selectBook function
function selectBook(bookId, extendedBookName) {
var extendedName = unescape(extendedBookName);
window.opener.selectBook(bookId, extendedName);
window.close();
}
And for my Java code...
public class BookSearchCriteria implements Serializable {
...
private List<String> bookNames = new ArrayList<String>();
public List<String> getBookNames() {
return bookNames;
}
public void setBookNames(List<String> bookNames) {
this.bookNames = bookNames;
}
The StringListConverter code...
#FacesConverter("myStringListConverter")
public class StringListConverter implements Converter {
// this is used as a regex, so choose other separator carefully
private static final String MY_SEPARATOR = "###";
#Override
public Object getAsObject(FacesContext context, UIComponent component,
String value) {
if (value == null) {
return new ArrayList<String>();
}
return new ArrayList<String>(Arrays.asList(value.split(MY_SEPARATOR)));
}
#Override
public String getAsString(FacesContext context, UIComponent component,
Object value) {
if (value == null) {
return "";
}
return join((List<String>) value, MY_SEPARATOR);
}
/**
* Joins a String list, src: http://stackoverflow.com/q/1751844/149872
*
* #param list
* #param conjunction
* #return
*/
public static String join(List<String> list, String conjunction) {
StringBuilder sb = new StringBuilder();
boolean first = true;
for (String item : list) {
if (first) {
first = false;
} else {
sb.append(conjunction);
}
sb.append(item);
}
return sb.toString();
}
}
I don't really understand why you want to populate your listBox using a popup.
But if you modify the underlying bean values, you need to rerender the <h:selectOneListbox/> to reflect these changes. If you are using (or can use) the richfaces framework it can be done quite easily through an ajax call.
The ajax4jsf component called <a4j:jsFunction/> can do the job. For example in your parent page add :
<a4j:jsFunction name="refreshListbox" reRender="booksListBox" limitToList="true"/>
and in your popup just call this js function when a new book value is selected :
<script type="text/javascript">
window.opener.refreshListbox();
</script>
You could also use a <rich:modalPanel> instead of a popup to stay in the same page and interact more easily with your jsf components.
The page in the popup window is running some server-side Java code that creates new options for the dropdown menu. This has no absolutely no effect on the parent page until the parent page is reloaded and regenerated by the server. To avoid reloading the page, you need to create and select the new option using client-side JavaScript/jQuery code.
Assuming that the HTML code for the resulting option should look something like <option value="bookId">extendedBookName</option>, you can use this:
<script>
function addBook(bookId, extendedBookName) {
var newOption = jQuery('<option>').val(bookId).text(extendedBookName);
var idInput = jQuery('#myForm\\:bookNames');
idInput.append(newOption).val(bookId);
}
</script>
Demo: http://jsfiddle.net/5Cwjk/
Or, if the selection from the popup window is not guaranteed to be new, then you'll want to dynamically determine whether creating an option is necessary before doing so to avoid duplicates:
<script>
function addBook(bookId, extendedBookName) {
var idInput = jQuery('#myForm\\:bookNames');
if (idInput.val(bookId).val() != bookId) {
var newOption = jQuery('<option>').val(bookId).text(extendedBookName);
idInput.append(newOption).val(bookId);
}
}
</script>
Demo: http://jsfiddle.net/nTtY9/1/