C# webbrowser control (executing all javascripts associated with form)

Question

I am trying to auto submit form using webbrowser control. I am using the following code to submit"

currentElement.InvokeMember("submit");

Now this methods works fine. But sometimes a form may have some javascript function that is called on button click at the time of submission. So let's say if a form has some button image called "Submit" and when a user presses it, a javascript function somefunction() is called and then form is submitted.

Problem is when I use the above method InvokeMember then it only submits the form and doesn't execute associated scripts (in this case somefunction()) and I have to manually write code

webBrowser1.Document.InvokeScript("somefunction");

But this requires that I know before hand if there is some function. Is there any way I submit form and it will automatically run all associated javascript?

And I don't know button name or ID either which is clicked by user to submit form. Because in some cases it may not even have ID or name for e.g.

<span class="btn" onclick="somefunction()">
<img style="cursor:pointer" title="Submit" alt="Submit" src="http://stackoverflow.com/imagesbutton.png?2012">
<div id="s" style=""></div>
</span>

Oof. That <span onClick> example that you gave is going to make this a really tough problem to solve in the general case. In your <span onClick> example, I assume that typing stuff into the form and pressing <kbd>Enter</kbd> doesn't work, either. If the browser can't spot the submit button, I don't give your wrapper good odds... — sblom
– sblom, Commented Apr 26, 2012 at 18:02
You can simulate a click on anything but you can't determine this action eventually end up doing a submit. So, the answer to the question "Is there any way I submit form and it will automatically run all associated javascript?" is yes, provided you know where to click. — Simon Mourier
– Simon Mourier, Commented Apr 27, 2012 at 12:47

Derreck Dean · Accepted Answer · 2012-04-26 18:28:33Z

2

+50

It's been a while since I have messed around with the WebBrowser control, but I used to make it jump through hoops for me. I've come across this issue in the past.

http://www.codeproject.com/Tips/60924/Using-WebBrowser-Document-InvokeScript-to-mess-aro

When you get a Form object, take the string out of the OnSubmit and run this to execute it before submitting the form:

object[] codeString = {"myObject.setVariable(0);"};
webBrowser1.Document.InvokeScript("eval",codeString);

Works like a charm.

answered Apr 26, 2012 at 18:28

Derreck Dean

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Ral Zarek · Accepted Answer · 2012-05-23 11:47:55Z

2

If you know the name or id of the image tag you can use

webBrowser1.Document.GetElementById("button").InvokeMember("click");

or

webBrowser1.Document.GetElementByName("button").InvokeMember("click");

to call the associate function in javascript

edited May 23, 2012 at 11:47

Ral Zarek

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answered May 23, 2012 at 10:07

carminePat

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