How to get HTML textbox value?

问题:

I am trying to get values of few textboxes on a website in a C# WinForms app. It is input type text, set to readonly, but when I try to read it in my app using

string price = webBrowser1.Document.GetElementById("price").GetAttribute("value");

it returns an empty string. When I try to set some other (not readonly) input value using .SetAttribute("value", "testValue"), it works just fine.

Anyone could help me with this please?

回答1:

Unfortunately the value from the text box cannot be retrieved using GetAttribute.

You can use the following code to retrieve the value:

dynamic elePrice = webBrowser.Document.GetElementById("price").DomElement;
string sValue = elePrice.value;

If you are not able to use dynamic (i.e. .NET 4+) then you must reference the 'Microsoft HTML Object Library' from the COM tab in Visual Studio and use the following:

mshtml.IHTMLInputElement elePrice = (mshtml.IHTMLInputElement)webBrowser.Document.GetElementById("price").DomElement;
string sValue = elePrice.value;

EDIT: This has been tested with the following code:

webBrowser.Url = new Uri("http://files.jga.so/stackoverflow/input.html");

webBrowser.DocumentCompleted += (sender, eventArgs) =>
{
     var eleNormal = (IHTMLInputElement)webBrowser.Document.GetElementById("normal").DomElement;
     var eleReadOnly = (IHTMLInputElement)webBrowser.Document.GetElementById("readonly").DomElement;
     var eleDisabled = (IHTMLInputElement)webBrowser.Document.GetElementById("disabled").DomElement;

     MessageBox.Show(eleNormal.value);
     MessageBox.Show(eleReadOnly.value);
     MessageBox.Show(eleDisabled.value);
};

回答2:

try to use innertext

string price = webBrowser1.Document.GetElementById("price").InnerText;