find text in webrowser c#

Question

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hello;

find button webbrowser:

HTML

<input type="submit" value="Book it" class="button-book-it">

error in my code:

C#

HtmlElementCollection elc = this.webBrowser1.Document.GetElementsByTagName("input");
HtmlElement el = this.webBrowser1.Document.GetElementsByTagName("input");
if (el.GetAttribute("value").Contains("Book it") == true)
{
    MessageBox.Show("find");
    break;
}
else
{
    MessageBox.Show("no");
}

Posted 15-Aug-13 12:09pm

samadblaj

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Comments

Richard C Bishop 15-Aug-13 18:09pm

What error?

samadblaj 15-Aug-13 18:17pm

not found.

Richard C Bishop 15-Aug-13 18:17pm

what is not found?

samadblaj 15-Aug-13 18:22pm

this page search "book it"?

samadblaj 15-Aug-13 18:09pm

find :Book it

2 solutions

Solution 2

OK, I've decided to post the other part of your issue as a second solution.

Be aware that if the document isn't done loading when you look for the input elements then you will not find the element. Make sure the document has loaded before you fill your HtmlElementCollection with the input elements. You could attach a routine to the DocumentCompleted event that fires the code to check for the input element. This would ensure your documents loaded before you look for you element. Like so...

Create a routine to handle the event and call your routine that checks for the Book-it value

C#

private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    // do test for Book-it value
}

Attach your routine to the DocumentCompleted event of the WebBrowser control...

C#

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

Posted 15-Aug-13 14:05pm

idenizeni

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idenizeni · Accepted Answer · 2013-08-15T13:14:00

These two lines in your code are redundant and are probably not what you intended...

C#

HtmlElementCollection elc = this.webBrowser1.Document.GetElementsByTagName("input");
HtmlElement el = this.webBrowser1.Document.GetElementsByTagName("input");

The second line above is doing exactly what the first is doing but putting the result in a different object (of the wrong type by the way, GetElementsByTagName() returns a collection of elements not a single HtmlElement).

You want to get a collection of the input elements, like the first line does. But then you want to work with the collection to get the specific input item from the collection.

You have multiple options to do this...

Option #1 - This option is closet to what you are trying in your code. But it assumes that we always want the first input element

C#

// get collection of input elements
HtmlElementCollection elc = webBrowser1.Document.GetElementsByTagName("input");

// get the first element if the collection isn't empty
if (elc != null && elc.Count > 0)
{
    HtmlElement el = elc[0]; // get first item
    // check attribute value
    if (el.GetAttribute("value").Contains("Book it") == true)
    {
        MessageBox.Show("find");
    }
    else
    {
        MessageBox.Show("no");
    }
}

Option #2 - This option uses a loop to check all input controls in the collection and assumes the value we are looking for can be part of one or more of the input elements

C#

HtmlElementCollection elc = webBrowser1.Document.GetElementsByTagName("input");

foreach (HtmlElement el in elc)
{
    if (el.GetAttribute("value").Contains("Book it") == true)
    {
        MessageBox.Show("find");
    }
}

Option #3 - This option uses LINQ to condense the code and is essentially doing what option #2 does but with less code.

C#

HtmlElementCollection elc = webBrowser1.Document.GetElementsByTagName("input");
HtmlElement el = (from HtmlElement eli in elc
                  where eli.GetAttribute("value") == "Book it"
                  select eli).FirstOrDefault();

if (el != null)
{
     MessageBox.Show("find");
}

Hope this helps.