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Interacting and Submitting HTML form with JavaScript in Swift

Trying to submit an HTML form / clicking a button from this web page: https://www.vegvesen.no/kjoretoy/Eie+og+vedlikeholde/skilt/personlig-bilskilt/sok-om-personlig-bilskilt
I've tried to use both .submit() and .click() with no success
webView.evaluateJavaScript("document.getElementById('personlig-kjennemerke').click();", completionHandler: nil)
So what I try to do is to fill in the text field with "REGNR" I then try to click the orange button to submit the form and access the information I am looking for.
I am able to fill in the textfield by using:
webView.evaluateJavaScript("document.getElementById('tegnkombinasjon').val ue='\(plateNumber)'") { (value, error) in
}
Picture of the button I want to press and the text field I try to fill in
But since I'm not able to click the button programmatically I've tried to actually click it in a subview. The page then tells me I have to fill in the text field first even though I have programmatically.
So not only am I unable to click the button, but I'm also wondering how I can make the web page understand that the text field actually already contains text.

Try this:
webView.evaluateJavaScript("document.getElementsByName(\"sjekkreg\")[0].elements[2].click()")
Why by name? Because that form doesn't have an id.
Also I see your form has custom function to send that form:
pkCtrl.submit(mineFelt,sjekkreg)

show form and content in "verification" modal

I would like to present a user with the form that they just filled out in a modal that pops up after they click "submit" for verification. I see this as a carbon copy of the form, but with each field disabled or grayed out so they can look it over and confirm that everything is right. To make changes to the form at this stage would require that they cancel out of the modal and would be taken back to their form.
I am having trouble getting the data that is contained within the form. Is there an easy way to do this with jQuery or JavaScript?
Or is there another strategy for allowing the user to look over what they just changed that I am missing/forgetting?

You can display a clone version of the form in the modal:
var $clonedForm = $('#myformid').clone();
$('input, select, textarea', $clonedForm).attr('disabled', 'disabled');
$clonedForm.appendTo('#modalid');

How to add a value to a textbox using a submit?

I have two submit buttons namely "Approve" and "Reject". Both of them go to one controller file so I set the controller file on the action tag of the form.
What I want is that when I click Approve, it sets the value of the hidden field named 'Decision' with 'Approved' and when I click 'Reject', the value of the hidden field will be 'Rejected' then the form will continue to submit to the designated controller.
However, the form continues to the controller but the decision field is empty.
Also, when I tried to put an 'alert' on the javascript function, it is not showing everytime I click the submit buttons eventhough I used the onClick tag.
Can someone suggest a working code for this? Thank you. :)

So I believe form actions have precedence over javascript and other stuff like animations.
To answer your question: you can make the submit buttons just normal buttons like so:
<input id='accept-button' type='button' name='accept' value='Accept' />
and add an event listener to it that changes the value of the hidden field when clicked then submits the form:
document.getElementById('accept-button').addEventListener("click", function () {
var hiddenid = document.getElementById('hidden');
var formid = document.getElementById('form-id');
hiddenid.value = 'Accepted';
formid.submit();
});
After a quick search I found a better solution from this question's accepted answer. It uses jquery though.

What changes to DOM are made when MVC Validation triggers?

I have a form in a modal window that is currently performing some validation.
(I am using ASP.NET MVC, JQuery UI, ajax forms, data annotations and unobtrusive is active)
When this validation triggers I have noticed so far that it does a few things:
1: my validation summary gets it's class changed from .validation-summary-valid to .validation-summary-errors
2: my invalid inputs have a class added to then called .input-validation-error
3: my validation messages get their class changed from .field-validation-valid to .field-validation-error
But there is something else that it is doing and I cant work out how it is tracking this.
I have a textbox that is required, before triggering the validation i can select inside this box, then select another box and the validation will be silent.
But as soon as i trigger the validation by clicking submit with an empty textbox, i can select the textbox and type something to remove the validation instantly, but if i then null it and select a different box this error is re-applied without re-submitting.
So my question is: what has changed, how does it know that I have attempted to submit already?

When validate is called, it adds a class to each input/select that is supposed to be validated. When the input/select is not valid it adds a class to the input/select:
class="input-validation-error"
When it is valid, it adds:
class="valid"
Validation only fires on the control when you change the value, not when it loses focus.
Validation fires on change, even before you submit the form. Take a required textbox, add a value to it, and tab off ... then go back and remove that value, and you should see the textbox highlighted red.

jquery redirect on enter press within a form?

I have an html form and within the form I have a <button> element. I am using jquery to redirect the page upon clicking the button (essentially I wanted to nest form elements but since its not valid xhtml I used a javascript workaround).
Furthermore, clicking the button grabs text from an input field, appends it to the query string then redirects the page (note that both the input field and the button are inside of the html form).
Now for what I want to do: I also want to have the same functionality when the user hits the 'enter' key from within the previously mentioned input field (i.e. same functionality as if the <button> was pressed. I have already written code that binds to the enter key (when I press enter in the input field I can get an alert to pop up). The problem is that since this input field is within <form> tags, I cannot seem to override the default action which is: upon pressing enter trigger the submit button. Is it even possible to override this and have the pressing enter event redirect the page to something other than whatever <form action is set to? Thanks.

Try
$('form').submit(function () {
return false;
});

This would really go against accessibility, but I think you could cancel the default action which is on the 'submit' event, with:
$('form#foo').submit(function(e) { e.preventDefault(); });
If I'm understanding correctly... or program that function to be dynamic and have it submit or not submit depending on a factor/flag.