Retrieve element attribute value when not initially defined in document text

Question

Retrieve element attribute value when not initially defined in document text

434 Views Asked by Ray Alex At 15 March 2013 at 04:07

Say we have a WebKitBrowser control and we set the DocumentText as such...

wkb.DocumentText = @"
<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01//EN' 'http://www.w3.org/TR/html4/strict.dtd'>
<html>
<head></head>
<body>
<form>
<input type='text' id='test' name='smith'><br>
</form>
</body>
</html>
";

If I was to then fetch the user input in that input field via C#, what is the proper method?

If I predefine the value attribute in the HTML, like...

<input type='text' id='test' name='smith' value='freedom'>

Then MessageBox.Show(wkb.Document.GetElementById("test").getAttribute("value")); accurately displays "freedom". However, if value is not defined, the result is always blank (I'm assuming it's null and not just empty).

This makes sense to me but I would be fetching user input, not predefined values. I suppose one could save the entire document to a string and parse it but it was much more simple in the standard IE browser control with the element.value route. What are my delicious options?

Original Q&A

There are 2 best solutions below

Ray Alex On 15 March 2013 at 19:01

I also wanted to add, this method works, sort of going off of viperguynaz's proper answer.

Essentially you create a navigating method for the webkit browser control, then point the webkit browser control do it in the events section. You perform a functionally useless form submission on the HTML side and then parse the parameters for the user input and off you go, to whatever fantasy awaits you.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Web;
using WebKit;

namespace test_run
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            wkb.DocumentText = @"
                <!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01//EN' 'http://www.w3.org/TR/html4/strict.dtd'>
                <html>
                <head></head>
                <body>
                <form method='get'>
                <input type='text' name='pike'><br>
                <input type='submit' value='Submit'>
                </form>
                </body>
                </html>";
        }

        private void Form1_Load(object sender, EventArgs e)
        {
        }

        private void button1_Click(object sender, EventArgs e)
        {

        }

        private void wkb_navigating(object sender, WebKitBrowserNavigatingEventArgs e)
        {
            string param1 = HttpUtility.ParseQueryString(e.Url.ToString()).Get(0);
            MessageBox.Show(param1.ToString());


        }
    }
}

**viperguynaz** · Accepted Answer · 2013-03-15T04:11:49.047000

You can't read form values in C# client side. You have to post (AJAX or full postback) the form back to read the values in C#. If you want to see if a value has changed, you can use jQuery's .on('blur' ... to capture the changed value and do an AJAX post back to the server.

Retrieve element attribute value when not initially defined in document text

There are 2 best solutions below

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