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How to replace <button> with enter key?

So basically I have a page where users can post a status, users are able to comment on these status's by typing in the textbox and clicking on the 'Reply' button. However I much rather remove the button so users can just press the enter key to post a reply. Any help would be greatly appreciated!
<div id="status_'.$statusid.'" class="panel panel-default">
<form>
<div class="input-group">
<input type="text" id="replytext_'.$statusid.'" onkeyup="statusMax(this,250)" class="form-control" placeholder="Add a comment.." autocomplete="off">
</div>
<button id="replyBtn_'.$statusid.'" onclick="replyToStatus('.$statusid.',\''.$url.'\',\'replytext_'.$statusid.'\',this)">Reply</button>
</form>
</div>

You can submit a form by pressing enter when a form element is active. See the following snippet that just hooks into the form via it's onSubmit event handler.
function handleSubmit() {
alert('Do your thing...');
}
<form id="commentForm" onSubmit="handleSubmit(); return false;">
<div class="input-group">
<input type="text" id="replytext_" class="form-control" placeholder="Add a comment.." autocomplete="off">
</div>
</form>

jQuery form Validation does not include value of submit button

I'm using jquery form validation from http://www.runningcoder.org/jqueryvalidation/
demo.html
<form id="form-signup_v1" name="form-signup_v1" method="get" class="validation-form-container">
<div class="field">
<label for="signup_v1-username">First Name</label>
<div class="ui left labeled input">
<input id="first_name" name="first_name" type="text">
<div class="ui corner label">
<i class="asterisk icon">*</i>
</div>
</div>
</div>
<input name="ok" id="ok" type="submit" class="ui blue submit button" value="Ok">
<input name="cancel" id="cancel" type="submit" class="ui blue submit button" value="Cancel">
</form>
<script>
$('#form-signup_v1').validate({
submit: {
settings: {
inputContainer: '.field'
}
}
});
</script>
I'm use form validation in the url not include the value of submit button
demo.html?first_name=John
I try to remove jquery form validation in the url include the value of submit button
demo.html?first_name=John&ok=OK
I want to check submit button when click from query string but when i use validation the url alway not include query string of button like the figure 1

If you want that the query doesn't include the button name just remove the name attribute from <input type = "button" name="ok">. Also assign a value to the button. By default the submit action forms the query string from the name value pairs in the form.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="get">
<input name="first_name" type="text" />
<input type="submit" value="button">
</form>

Can't simulate click on submit button via javascript

I'm having problems simulating a click via javascript on a mailchimp pop-up subscribe form and i need your help.
<!-- Title & Description - Holds HTML from CK editor -->
<div class="content__titleDescription" data-dojo-attach-point="descriptionContainer"><strong>Unlock the content </strong>by subscribing to our page.</div>
<!-- Form Fields -->
<form action="//mc.us7.list-manage.com/subscribe/form-post?u=bcd9828fa83ea7a231ffbee26&id=1928481ac4" accept-charset="UTF-8" method="post" enctype="multipart/form-data" data-dojo-attach-point="formNode" novalidate="">
<div class="content__formFields" data-dojo-attach-point="formFieldsContainer">
<div class="field-wrapper" id="uniqName_3_0" widgetid="uniqName_3_0">
<label for="mc-EMAIL">Email Address</label>
<input type="text" name="EMAIL" value="" id="mc-EMAIL" class="invalid">
<div class="invalid-error" style="display: block;">This field is required.</div>
</div>
<div class="field-wrapper" id="uniqName_3_1" widgetid="uniqName_3_1">
<label for="mc-FNAME">First Name</label>
<input type="text" name="FNAME" value="" id="mc-FNAME" class="valid">
<div class="invalid-error" style="display: none;"></div>
</div>
<div style="position:absolute;left:-5000px;">
<input type="text" name="b_bcd9828fa83ea7a231ffbee26_1928481ac4" tabindex="-1" value="">
</div>
</div>
<div class="content__button">
<input class="button" type="submit" value="Subscribe" data-dojo-attach-point="submitButton">
</div>
</form>
<!-- Footer - Holds HTML from CK editor -->
<div class="content__footer" data-dojo-attach-point="footerContainer"></div>
</div>
<div class="modalContent__image" data-dojo-attach-point="formImageContainer"></div>
The code that i'm trying to target is:
<input class="button" type="submit" value="Subscribe" data-dojo-attach-point="submitButton">
It's the submit button "Subscribe" that you can also see in
http://www.aspeagro.com/EN_Program_Abricot.html
Thank you!

How about this? I think is should do what you're after?
HTML
<input id="submit-button" class="button" type="submit" value="Subscribe" data-dojo-attach-point="submitButton">
JS
$('#submit-button').on('click', function(e){
e.preventDefault();
// Do what you want to do
});

set id="btn" attribute to your submitting button and using jQuery you can trigger click with $("#btn").click(); call

If your aim is to submit the form, then don't bother sending a click event, but use the form's submit method:
var form = document.getElementById('uniqName_3_0').parentNode.parentNode;
form.submit();
The code is of course easier if you give the form an id attribute:
<form id="myform" ...
and then:
document.getElementById('myform').submit();

That button is inside an iframe. To access it from the parent page you would trigger it like this:
$('iframe').contents().find('input:submit').click()

Convert / Change Div element with Form element

I'm using panelbar, hence form tag is disturbing it's open/close animation
I found that form tag is creating issue, so I want div tag to convert to form tag when I click submit button.
Eg:
<div class="myForm">
<div id="detail">
Name: <input type="text" name="text_name" value="Some text here to edit"/>
</div>
<div id="income">
Income: <input type="text" name="text_income" value="your income"/>
</div>
<input type="submit" value="Submit" />
</div>
Convert to:
<form name="input" id="" action="html_form_action.php" method="post">
<div id="detail">
Name: <input type="text" name="text_name" value="Some text here to edit"/>
</div>
<div id="income">
Income: <input type="text" name="text_income" value="your income"/>
</div>
<input type="submit" value="Submit" />
</form>
So all I want is change the div with class ".myForm" to Form element
and closing div with closing form tag.
Is there any way to do this?

Use Javascript + jQuery:
$('.myForm').children().unwrap().wrapAll("<form name='input' id='' action='html_form_action.php' method='post'></form>");
This removes the wrapping div ".myForm" with the unwrap method. Then wraps it's children with the wrapAll method.

You can done this work simply using Jquery -
$(document).ready(function(){
$('form').html($('.myForm').html());
});
But if you want to do this, this is not correct because you use assign id of some element. So after append whole HTML into <form> you should remove .myForm.
Try This
For remove div with class .myForm after append innerhtml into form, you can simply use .remove.
$(document).ready(function(){
$('form').html($('.myForm').html());
$('.myForm').remove();
});
Try This

If you do like html5, you can check out html5 "form Attribute", which allows you to use the form elements wherever you like, and you don't need to wrap the contents inside form tags.
Check this out
<form name="input" id="myform" action="html_form_action.php" method="post"></form>
<div class="myForm">
<div id="detail">
Name: <input type="text" name="text_name" value="Some text here to edit" form="myform" />
</div>
<div id="income">
Income: <input type="text" name="text_income" value="your income" form="myform" />
</div>
<input type="submit" value="Submit" form="myform" />
</div>

On click of submit button of form A, form A should disappear, and in its place, form B should appear

I have two forms, one is shown and the other is hidden. On click of submit button of form A, form A should disappear, and in its place, form B should appear.
In my code, On click of submit button(id="signup-btn1") of form "signup", form "signup" should hide and form "signup2" should show. They are both in exactly the same position according to the styles. It's just a matter of switching the first form content for the second.
The HTML is as follows:
<div class="signup-form">
<form class="signup" name="sign-up" method="post" action="">
<input type="email" name="signup-email" value="" placeholder="E-mail" class="signup-email" />
<input type="password" name="signup-password" value="" placeholder="Password" />
<input type="password" name="signup-confirmpassword" value="" class="c-password" placeholder="Confirm Password" />
<input type="submit" id="signup-btn1" name="signup-btn" value="Sign up" class="signup-btn" />
</form>
<form class="signup2" name="sign-up2" method="post" action="">
<h2>Step 2</h2>
<p>Please enter your school name to complete the sign up.</p>
<input type="text" name="school-name" value="" class="school-input" placeholder="School Name" />
<input type="submit" name="complete-signup" value="Complete Sign up" class="signup-btn" />
</form>
</div>
Using jQuery is preferred and should result in far less code. Thanks

Place each form in a div, then:
$("button").click(function(){
$("#div1").toggle();
$("#div2").toggle();
})
Work if your page have only 2 above forms :)