What steps should I take to execute JavaScript within the WebBrowser control?

Within my winforms application, there is a WebBrowser control named webBrowser1.

In the code, all I have added is navigation to a specific page:

private void Form1_Load(object sender, EventArgs e)
{
    webBrowser1.Navigate("http://localhost:6489/Default.aspx");
}

The code for the page I navigate to is as follows:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="TableRowShow.Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript">
      window.onload = function()
      {
        document.getElementById('addDestination').setAttribute('onclick', 'addDest();');
      }

      function attach()
      {
        document.getElementById('addDestination').setAttribute('onclick', 'addDest();');
      }

      var i = 1; // position of next tr to be shown

      function addDest()
      {
        var trs = document.getElementById('travelTable').getElementsByTagName('tr');

        if (trs[i] != null)
          trs[i++].style.display = "";
      }
    </script>
</head>
<body>
    <form id="form1" runat="server">
      <table id="travelTable">
        <tr>
          <td>
            <asp:TextBox runat="server" />
          </td>
        </tr>
        <tr style="display: none">
          <td>
            <asp:TextBox runat="server" />
          </td>
        </tr>
        <tr style="display: none">
          <td>
            <asp:TextBox runat="server" />
          </td>
        </tr>
      </table>
      <asp:HyperLink runat="server" ID="addDestination"
        ClientIDMode="Static"  NavigateUrl="javascript:;" >
        Add Destination
      </asp:HyperLink>
    </form>
</body>
</html>

Viewing this page in a browser like IE or Chrome displays it with no issues:

When clicking on the Add Destination anchor, a new input is created:

However, the problem I'm facing with the WebBrowser control is that it loads the page but the JavaScript does not execute.

Clicking on Add Destination doesn't trigger any action, even though the same page functions well in Chrome or IE.

After placing a breakpoint and using the following line in the Immediate window:

webBrowser1.Document.InvokeScript("addDestination");

and then continuing to run the program activates the JavaScript within that function, successfully adding a new input.

Thank you for your responses!

Answer №1

For a more effective way of adding click handlers, consider attaching them in the following manner instead of utilizing setAttribute within the onload and attach functions:

document.getElementById('addDestination').onclick = addDest;

Answer №2

To test for JavaScript errors, consider changing the value of the ScriptErrorsSuppressed property to false.

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