Develop Reference

C# Click on HtmlElement With no ID only Class

I am not using selenium nor anything else, i just want to do it on the webbrowser on the windows form application.
I have a windows form application and i want to click on a button with code but there is no ID.
I tried using a lot of different things found on this websites forums, but none of this works.

Have you tried using WebBrowser.GetElementByTagName("div") and then checking each element against attribute type=submit?
Your code should look something like
HtmlElement submit = FindSubmitElement(webBrowser1.Document);
submit?.InvokeMember("submit");
public HtmlElement FindSubmitElement(HtmlDocument document)
{
HtmlElementCollection elems = document.GetElementsByTagName("div"); // since your tag is div
// this will return collection, even in case there is just one div, find the first one, having an attribute 'type' with value 'submit'
foreach (HtmlElement elem in elems)
{
string type = elem.GetAttribute("type");
if (!string.IsNullOrEmpty(type) && type == "submit")
{
return elem; // if div tag with attribute type is found exit and return that html element
}
}
return null; // if no div tags found with an attribute 'type' return null
}
Check more on GetElementsByTagName method on the MSDN docs. Code is taken from there and adjusted to your need.

Programmatically click button in C#

I'm trying to programmatically click a series of buttons on an HTML web page which looks as follows:
<div class="srp-actions blue-button"><a class="primary-action-button label" href="/people/invite?from=profile&key=243930744&firstName=Will&lastName=Yang&authToken=p8Oz&authType=OUT_OF_NETWORK&connectionParam=member_desktop_search_people-vertical-module&csrfToken=ajax%3A7824954558998584370&trk=vsrp_people_res_pri_act&trkInfo=VSRPsearchId%3A12487701484818103943%2CVSRPtargetId%3A243930744%2CVSRPcmpt%3Aprimary" data-li-result-interaction="instant-connect" data-li-success-text="Invite Sent" data-li-connect-href="/people/contacts-search-invite-submit?memIds=243930744&authTokens=p8Oz&authTypes=OUT_OF_NETWORK&from=voltron&firstName=Will&lastName=Yang&isAjax=true&connectionParam=member_desktop_search_people-vertical-module&csrfToken=ajax%3A7824954558998584370&trk=vsrp_people_res_invite_act&trkInfo=VSRPsearchId%3A12487701484818103943%2CVSRPtargetId%3A243930744%2CVSRPcmpt%3Aprimary">Connect</a><div class="secondary-actions-trigger"><button role="button" class="trigger"><span>Secondary Actions</span></button><ul class="menu"><li>Send InMail</li><li>Share</li></ul></div></div>
Here's the current code to find the button element and perform the action:
HtmlElementCollection elements = webBrowser1.Document.GetElementsByTagName("a");
// First find and click "Connect" buttons
foreach (HtmlElement item in elements)
{
if (item.OuterHtml.Contains("action-button label") &&
!item.OuterHtml.Contains("Message") &&
item.OuterHtml.Contains("OUT_OF_NETWORK"))
{
item.SetAttribute("href", item.GetAttribute("data-li-connect-href"));
item.InvokeMember("Click");
}
}
The code properly find the anchor element, but the InvokeMember method doesn't seem to yield any result, any idea what is wrong?

The tag you are using does not specify exactly which specific tag you need:
x = webBrowser1.Document.GetElementsByTagName("a")
Instead try :
x= webBrowser1.Document.GetElementsById("anchor_id");
x.InvokeMember("click");
Or try using following method to verify whether its the intended tag you're using via attribute.
if (element.GetAttribute(attribute).Equals(attName))

Access elements by Custom Attribute

I am wondering if I am able to access Html elements in aspx from code behind by custom attribute name. Like
HtmlElement[] allElements = Page.FindElementByCustomName("custom-name");
and it will give me an array of all elements with that attribute suppose my aspx is as below
<a runat="server" custom-name = "any">Faf</a>
<a runat="server">AB</a>
<a runat="server" custom-name = "any">Amla</a>
and allElements will have two a elements i.e
<a runat="server" custom-name = "any">Faf</a>
<a runat="server" custom-name = "any">Amla</a>
Is it possible?

You can iterate through all controls in a page, but it will have to be done recursively. For example, start with Page.Controls, then, for each control, iterate through its Controls collection. For a control to take attributes it needs to implement IAttributeAccessor; you can check if the control in your iteration implements this interface. It is an interface that is required when you are to insert custom attributes on markup. For example, WebControl implements it. If now, when you try to add a custom attribute, ASP.NET will fail saying that there is no property with that name.
Something like:
public static void ListControls(ControlCollection controls, List<Control> controlsFound)
{
foreach (var control in controls.OfType<Control>())
{
if (control is IAttributeAccessor)
{
controlsFound.Add(control);
ListControls(control.Controls, controlsFound);
}
}
}
Which you should call from your page:
var controlsFound = new List<Control>();
ListControls(this.Controls, controlsFound);
In the end, just iterate through controlsFound, which you know is a collection of IAttributeAccessor and retrieve attribute attribute-name:
var attr = (control as IAttributeAccessor).GetAttribute("attribute-name");

Invoke button click programmatically

I want to programmatically click button on a webpage with source like this
<input alt="BusiBtn" class="aButtn" type="submit" value="Search" tabindex="16">
When I do
WebBrowser b = new WebBrowser();
b.Navigate(URL);
while (b.ReadyState != WebBrowserReadyState.Complete)
{
Application.DoEvents();
}
b.Document.GetElementByID("BusiBtn").InvokeMember("click");
I get "Object reference not set to an instance of object error".
Can somebody help.
Thanks
Rashmi

What you can do in this case simply find all the HtmlElements having input tag. If you need to invoke all the input tags in general, then just invoke click on them. And if you need only the above input element, then filter all the input tags to search for the specific tag with the attribute values like above. Please have a look at the following code:
HtmlElementCollection elems = b.Document.GetElementsByTagName("input");
foreach (HtmlElement elem in elems)
{
string altStr = elem.GetAttribute("alt");
string classStr = elem.GetAttribute("class");
string typeStr = elem.GetAttribute("type");
string valueStr = elem.GetAttribute("value");
string tabindexStr = elem.GetAttribute("tabindex");
if((altStr == "BusiBtn") && (classStr == "aButtn") && (typeStr == "submit") && (valueStr == "Search") && (tabindexStr == "16"))
{
elem.InvokeMember("click");
break;
}
}

You're using the wrong field.
alt is for alternative text.
You have not actually given that button an id of BusiBtn.
Try:
<input id="BusiBtn" class="aButtn" type="submit" value="Search" tabindex="16">
The clue is in the GetElementByID call. It's not called GetElementByAlt for a reason ;)

add 'name' property to input tag and then use GetElementsByName property

You should use the GetElementsByTagName method instead of GetElementById to get all Input-Elements on the page and then cycle through using GetAttribute. An example can be found here http://msdn.microsoft.com/en-us/library/system.windows.forms.htmldocument.getelementsbytagname(v=vs.110).aspx.

C# Access tags properties by HtmlElement

There is an html like:
<div id="instance" style="color:red;display:block; .... bila bila">
<h2>some text</h2>
</div>
I wanna access style of div via this code;
foreach (HtmlElement link in webBrowser1.Document.GetElementsByTagName("div"))
{
if (link.GetAttribute("id").ToString() == "instance")
{
MessageBox.Show(link.innerhtml);
}
}
But link.innerhtml gives me the inside of div tag, not div's own. Output text of Messag.Box is:
<h2>some text</h2>
I also tried this too:
MessageBox.Show(link.GetAttribute("style"));
but it didnt work.
How to access div properties via same div's id?

You should probably use something like this:
MessageBox.Show(link.OuterHtml);