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Changing the value of a hidden field to the value of a checkbox on submit with javascript inside Contact Form 7 Wordpress plugin

I have been trying to get this working for more than a week now, searching endlessly for the solution and I can't figure out what I'm doing wrong. I am not a coder, just trying to duct tape some functions together to get this working... Please help!
I have the following checkbox inputs on my Contact Form 7 form inside a Wordpress page. I have Mailchimp for Wordpress updating a group which reflects the visitors interests. I'm trying to get the value of the group assigned to a hidden input field so that the built in mail feature and other Zapier integrations can use the interest values. Most of these apps seem to lack support for the groups functionality inside Mailchimp.
The form html is as follows:
<p>
<label>Which Are You Most Interested In?</label></br>
<label>
<input name="mc4wp-INTERESTS[gs8o25e9bc][]" type="checkbox"
value="ac2ed8233d"
required=""><span>Interest 1</span>
</label>
<label>
<input name="mc4wp-INTERESTS[gs8o25e9bc][]" type="checkbox"
value="s3g2c99k0x"
required=""> <span>Interest 2</span>
</label>
<label>
<input name="mc4wp-INTERESTS[gs8o25e9bc][]" type="checkbox"
value="k9n6xp3s26"
required=""> <span>Interest 3</span>
</label>
</p>
<input type="hidden" id="int-in" name="int-in"</input>
--
I've tried several variations of this including some inline stuff, putting the code in the top or bottom of the page, putting it into the Additional section of Contact Form 7, putting it into a scripts plugin inside wordpress, trying to see if it's an array thing and trying code for pushing from array (more over my head) and so many others. Here is what I'm basically trying to do, albeit wrongly via this code because obviously it is not working...
JS:
$('form').submit(function() {
$('input[name="#mc4wp-INTERESTS[gs8o25e9bc] .
[]"]').change(function(){
$('#int-in').val($('input[name="#mc4wp-INTERESTS[gs8o25e9bc] .
[]"]').val());
});
--
Online there is not much support for Mailchimp groups, and I suspect groups functions of most contact apps, not even with paid plugin feature. Mailchimp for Wordpress has the most support I could find and you still have to do some tinkering to get it working. I'm soooo ready to know what the heck works instead of all the stuff I've been trying! Thank you in advance. I really appreciate it!

Wordpress disables the $ shortcut, so you need to either replace $ with jQuery or wrap your code:
(function($){
// your code here
})(jQuery);
Plus, the name of those checkboxes doesn't contain a hashtag. I also have no idea what you're doing with those dots and linebreaks there.
In addition, you're assigning a onchange handler only when the form is submitted, but you'll want that to work from the start instead.
Here's a solution that sets the onchange handler to grab the value from all checked checkboxes and puts it into the hidden input.
var selector = 'form input[name="mc4wp-INTERESTS[gs8o25e9bc][]"]';
(function($) {
$(selector).change(function() {
var interests = Array.from(document.querySelectorAll(selector))
.filter(e => e.checked).map(e => e.value).join(",");
$('#int-in').val(interests);
console.log("set to", interests);
});
})(jQuery);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<p>
<label>Which Are You Most Interested In?</label><br/>
<label>
<input name="mc4wp-INTERESTS[gs8o25e9bc][]" type="checkbox"
value="ac2ed8233d"><span>Interest 1</span>
</label>
<label>
<input name="mc4wp-INTERESTS[gs8o25e9bc][]" type="checkbox"
value="s3g2c99k0x"> <span>Interest 2</span>
</label>
<label>
<input name="mc4wp-INTERESTS[gs8o25e9bc][]" type="checkbox"
value="k9n6xp3s26"> <span>Interest 3</span>
</label>
</p>
<input type="hidden" id="int-in" name="int-in">
<input type="submit">
</form>

Inject Javascript to select all radio buttons with specified value

Slightly odd question, but I'm trying to find a way (if possible) to select all radio buttons that have the same value. We regularly get hundreds of spam accounts signing up on our website, and it would be easier to set all radio buttons to "Reject" and double-check to make sure there's no legitimate ones, as opposed to constantly clicking on a radio button. (Lazy is my middle name, yes.)
Is this possible? If so, how? I haven't got access to the actual web pages to code in a button to do just this yet, but it's something I'm looking at long term. Right now though, I need something quick and dirty to do what I want it to do. I'm using Chrome, and can use Greasemonkey if that's required.
The value to select by is "reject".
A snippet of code that's being used. If it's of any consequence, our forum is running Xenforo:
<li>
<label for="ctrl_users16667action_reject">
<input type="radio" name="users[16667][action]" value="reject" class="Disabler" id="ctrl_users16667action_reject">
Reject and delete with rejection reason:
</label>
<ul id="ctrl_users16667action_reject_Disabler" class="disablerList">
<li>
<input type="text" name="users[16667][reject_reason]" value="" size="45" placeholder="Optional" class="textCtrl" id="ctrl_users16667reject_reason">
</li>
</ul>
</li>

You're looking for a bookmarklet or a GreaseMonkey (or TamperMonkey or similar) script.
Re bookmarklets, you can use the javascript: pseuedo-protocol to run script on the page you're looking at from your bookmarks manager. Just make the URL in your bookmark:
javascript:(function() { /* ...your code here ...*/ })();
Because it has to be URI-encoded, you can find "bookmarklet generators" out there to handle that part for you.
Alternately, there are GreaseMonkey, TamperMonkey, and similar add-ons/extensions for browsers.
Then it's a trivial matter of selecting the relevant radio buttons:
$('input[type=radio][value="reject"]').prop('checked', true);
So if jQuery is already loaded on the page in question, you could use this as a bookmarklet:
javascript:(function(){$('input[type=radio][value="reject"]').prop('checked',true);})();

Use :radio to get radio buttons, then for filtering use attribute equals selector
var $ele = $(':radio[value="reject"]')
or filter()
var $ele = $(':radio').filter(function(){ return this.value == 'reject'; });
FYI : It's a jQuery solution and it only works if you are loaded jQuery library in the page.

Try this it will work
$("input:radio[value=reject]")

you have to give unique name to all radio buttons then you can select multiple radio buttons using javascript
you have to give same class to radio button
<input type="radio" name="radio[]" class="my_class" value="1" />
<input type="radio" name="radio[]" class="my_class" value="1" />
<input type="radio" name="radio[]" class="my_class" value="0" />
$(".my_class").each(function(){
if($(this).val() == "1"){
$(this).attr('checked','checked);
}
});
Thanks

Jquery Mobile showing double form labels after form submit

This is my first time using jquery mobile... I have form items like this -
<label for="five_miles">5 Miles</label>
<input type="radio" name="distlim" value="5" id="five_miles">
As it says in the documentation, to label form elements, you must use a label tag and the for should = the id of that form item.
And it works fine. I load the page, the form elements are being generated and look good.
But after I submit the form back to the same page, it shows the form with the generated button elements with the label text inside the element but also it shows the text for the label above each form element again.
The code generated by jquery looks like this -
<div class="ui-radio">
<label for="yes" class="ui-btn ui-corner-all ui-radio-on ui-btn-inherit ui-btn-icon-left">Yes</label>
<input type="radio" name="transportation" class="transyes" id="yes" value="Yes" checked="">
</div>
<label for="yes">Yes</label>
I am thinking that maybe the dom is being loaded and the the jquery is loading afterwords and adding the other label element. Only happens after the form submit.
Tried putting my jscript files in the footer and in the header, and I tried putting the label above and below the form elements. ...not sure what else to do.
Thanks.

I overlooked in the docs that you have to wrap radio buttons and checkboxes with
<fieldset data-role="controlgroup"></fieldset>

JQuery .replaceWith() suddenly putting new element in the wrong place?

This one is really baffling me. I'm using replaceWith() to "clear" a file input field. However, when it replaces it, it puts it back in the wrong place, and I have no idea why. I used the term "suddenly" in the title because what's even more mysterious is that when I stopped working for the weekend the replacement was working exactly as expected. Now I get back to work and suddenly it's not.
Here's the source HTML before calling replaceWith():
<label>Audio</label>
<i style="color:#888888;">MP3 or OGG format recommended</i>
<br>
<button id="clear_audio_input" style="display:none;">Clear</button>
<input type="file" value="" name="source_audio" style="width:300px;">
<br>
<div style="margin-top:15px;">
<b>Current: </b>
<i id="current_audio_source">1360954394_121RuleOfRosePianoEtudeI.mp3</i>
<br>
<input id="source_audio_value" class="required_media" type="hidden" value="1360954394_121RuleOfRosePianoEtudeI.mp3" name="source_audio">
<span id="current_audio_info_a"><input type="checkbox" style="position:relative;top:3px;margin-left:0px;" value="yes" name="source_audio_delete">
Delete current audio?
Current audio will be replaced
Note the location of the FILE input field, named "source_audio". It's immediately after the "Clear" button.
Now, after I call replaceWith(), the HTML looks like this:
<label>Audio</label>
<i style="color:#888888;">MP3 or OGG format recommended</i>
<br>
<button id="clear_audio_input" style="display: none;">Clear</button>
<br>
<div style="margin-top:15px;">
<b>Current: </b>
<i id="current_audio_source">1360954394_121RuleOfRosePianoEtudeI.mp3</i>
<br>
<input type="file" value="" name="source_audio" style="width:300px;">
<input id="source_audio_value" class="required_media" type="hidden" value="1360954394_121RuleOfRosePianoEtudeI.mp3" name="source_audio">
<span id="current_audio_info_a" style="display: inline;"><input type="checkbox" style="position:relative;top:3px;margin-left:0px;" value="yes" name="source_audio_delete">
Delete current audio?
Current audio will be replaced
Notice that it is now several lines down and inside another DIV.
Here is the script that controls the "Clear" button's actions:
$("#clear_audio_input").live("click", function() {
$("input[name='source_audio']").replaceWith($("input[name='source_audio']").val('').clone(true));
$("#source_audio_value").val($("#current_audio_source").text());
$(this).hide();
$("#current_audio_info_a").show();
$("#current_audio_info_b").hide();
checkRequiredMedia();
return false;
});
Here's the basic intended workflow. On load, the clear button is hidden because there is nothing yet to clear. After the user has selected a file, the clear button appears. Clicking the button will clear the file input (by replacing it) and then the button will hide again, essentially returning the form to the same state it was in on load.
Any reason why this oddity is happening (especially since it wasn't happening a few days ago, and I haven't changed anything since then)?

The issue is because you have two inputs with the name source_audio. To get around this, you will need to either give the two inputs fields an id, or change the name.
For example:
$('#my_file_input').replaceWith('<input id="my_file_input" type="file" name="source_audio" />');
$('#my_hidden_file_input').val('');

Protect unspecified Javascript event handlers from being garbage collected

Recently I posed a question, asking why some of my javascript code was misbehaving. However, the accepted answer didn't fully solve my problem, so here I am once again.
Problem Description
I have a <div> which has a collection of radio buttons in it.
I use jquery ui to style that collection with a buttonset(). It looks resonably pretty.
Then I empty the <div> with jquery by doing something to the effect of $("#mydiv").html("")
Then I once again restore exact contents that were removed.
Finally the buttonset is no longer working properly, because its events got unhinged in the process.
So my question is how to protect such bound events from being garbage collected, when I temporarily tinker with the DOM?
NB! I can't do display:none to hide the <div> instead, because the whole business with deleting html content and restoring it later is handled by an unnamed jquery plugin. Nor can I call buttonset() again, because a) the graphic style gets messed up, and b) there are other controls in my real problem that don't have this handy functionality. So what I really need is some way to protect all those handlers while the elements which behavior they are supposed to govern are temporarily missing from the DOM.
Sample Code
HTML
<div id="container">
<div id="buttonset">
<input type="radio" id="radio1" name="option" />
<label for="radio1">X</label>
<input type="radio" id="radio2" name="option" />
<label for="radio2">Y</label>
<input type="radio" id="radio3" name="option" />
<label for="radio3">Z</label>
</div>
</div>
<div id="control">
<input id="toggle" type="checkbox"/>
<label for="toggle">Toggle</label>
</div>
Javascript
$(function(){
$("#buttonset").buttonset();
$("#toggle").click(
function(){
if($(this).is(":checked"))
{
backup = $("#container").html();
$("#container").html("");
} else $("#container").html(backup);
}
)
});
Playable Version
See this jsFiddle
Solution
I used the idea in the accepted answer to save html contents before applying buttonset(), then reapply buttonset() each time as needed on that saved data.

Update:
Here's an updated fiddle that's pretty close to what your OP is. The basic idea is it destroys the buttonset to get the original html back
$(function() {
//Turn the radio buttons into a jquery ui buttonset
$("#buttonset").buttonset();
//Use the toggle button to hide/show the #container div.
//NB! It's not possible to do css display:none instead,
//due to some other limitations, to wit, I'm using a
//library that I can not modify.
$("#toggle").button();
var backup; // added this to prevent it from leaking onto global scope.
$("#toggle").click(function() {
if ($(this).is(":checked")) {
// restore the html back
$("#buttonset").buttonset("destroy");
backup = $("#container").html();
$("#container").html("");
}
else {
$("#container").html(backup);
$("#buttonset").buttonset();
}
})
});