C# html element change input value

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this is my html code

HTML

<input type="Text" name="MESSAGE" class="pmain" size="30">

so this would look like a normal blank textbox on a website, I want to make it so when I press a button on my program text will appear on it.

this is my C# code

C#

private void AddNameBtn_Click(object sender, EventArgs e)
     {
         foreach (HtmlElement he in webBrowser1.Document.All.GetElementsByName("MESSAGE"))
         {
                 he.SetAttribute("value", "HI");
         }



     }

This should make the textfeild/text box in the html website say "HI" but when i press it nothing happens, can some one please help or explain why this isn't working? I don't understand, it should work!

Posted 19-May-13 0:16am

C.CoderCreator

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Comments

Prasad Khandekar 19-May-13 6:34am

Is this a windows forms or WPF or ASP.NET application. For ASP.NET application your button click function will simply be transformed into

private void AddNameBtn_Click(object sender, EventArgs e) {
MESSAGE.Text = "Hi";
}

[no name] 19-May-13 6:37am

its a .net application, and no that dosen't make sense, the MESSAGE.text, becasuse MESSAGE is not declared, this site is being loaded into a webbrowser1, and the finding the textfeild then adding text to it

[no name] 19-May-13 8:10am

"nothing happens" is not helpful information. What does "nothing happens" mean? The button click event is not firing? Your foreach does not run? Can't find MESSAGE? You wanted your car to start and "nothing happens"?

[no name] 19-May-13 18:32pm

well I don't know what the problem is, that wht I said nothing happens, because nothing happens, its like you fart and and you hear no sound

David_Wimbley 19-May-13 12:32pm

I threw your code into a test project and it works for me.

Stupid question, but are you sure you are loading the HTML into your web browser component properly? Example: webBrowser1.Url = new Uri(@"c:\users\david\documents\visual studio 2012\Projects\Winforms1\Winforms1\Examples\test.html");

Otherwise with more details of what nothing happens means then im not sure what the problem is as it appears to work.

[no name] 19-May-13 18:35pm

im using webbrowser1.navigate("google.com"); so then it goes to the website and will add text to the input which is some sort of text field, using google as an example, i know how to make a google search bar, so when the page lods, test will appear in that input feild which is like a textbox like in my question

4 solutions

Solution 4

Your displayed HTML does not get automatically updated if you are in a Windows Forms Application using a WebBrowser Control.

After you change the element, you need to get the updated HTML and reload the WebBrowser with it. Something like this....

First update the element you want to change in the WebBrowser and set it to the new value of the element....

Then grab the Updated HTML string from the WebBrowser (which is NOT automatically updated on the WebBrowser Display)

Then rewrite the HTML string and load it into the Web Browser
private void LoadWebBrowser(WebBrowser wb, string HTML)
{
try
{
wb.DocumentText = "0";
wb.Document.OpenNew(true);
wb.Document.Write(HTML);
wb.Refresh();
}
catch (Exception ex)
{
EventLogger.Log($"Error in LoadWebBrowser->{ex.Message}", Color.Red);
}
}

Best Luck.

Posted 18-Aug-24 10:13am

Tom Sowdon

Comments

Dave Kreskowiak 19-Aug-24 1:31am

This was solved 11 years ago.

Solution 3

change class="pmain" to id="pmain" then use

C#

document.GetElementByID("pmain").SetValue("value","HI");

Posted 19-May-13 13:56pm

charles henington

Solution 1

Either use a html button and create a javascript function

or

make the input textbox server side

Posted 19-May-13 6:19am

Mr_cool

Comments

David_Wimbley 19-May-13 12:30pm

I believe OP is doing this via winforms/web browser component

[no name] 19-May-13 18:36pm

not much information

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

David_Wimbley · Accepted Answer · 2013-05-19T13:44:00

Ok so i believe i understand your question. You were loading some html into your web browser component but the text input was not being populated with HI as you specify in your question.

From what i saw/wrote it is because the document had not finished loading by the time it was trying to populate the textbox with HI. So by using the DocumentCompleted Event Handler that will cause the web browser to wait till the document has loaded properly and then run your code to populate the textbox.

I use google as the example.

C#

public Form1()
        {
            InitializeComponent();
            webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
        }

        private void AddText_Click(object sender, EventArgs e)
        {
            webBrowser1.Url = new Uri(@"http://google.com");
        }

        void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            foreach (HtmlElement he in webBrowser1.Document.All.GetElementsByName("q"))
            {
                he.SetAttribute("value", "HI");
            }
        }

Is this what you were looking for? The way i understand it i believe so.

C# html element change input value

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C# html element change input value

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