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Webpage loses interactivity with JavaScript when a form is submitted

I have a single page website that has three buttons (styled with jQuery Mobile) as a menu which, when clicked, show different content that is contained on hidden "div". However, on the main page I have a form connected to mysql which lets users join in, but when you fill the form and click the button "submit", the page "kind of reloads" and the header buttons don't work anymore. So, when form is submitted on main div, menu stops to work (it doesn't display and hide content anymore) Is there any solution to this?
(I've included a snippet but here the problem is not seen as I can't connect it to mysql).
function updateContent(hash) {
var newClass = hash.substring(1);
var newContent = $("." + newClass).html();
$("#content").html(newContent);
$("#content").css("display", "none");
}
if (window.location.hash) {
updateContent(window.location.hash);
}
$(".contentUpdate").click(function() {
updateContent($(this).attr("id"));
$("#content").fadeIn();
$(".contentUpdate").removeClass("ui-btn-active");
});
.hiddenContent {
display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css" />
<script src="https://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script>
<div id="menu">
<div data-role="navbar">
<ul>
<li><a class="contentUpdate" id="#swim">Swim</a></li>
<li><a class="contentUpdate" id="#cycle">Cycle</a></li>
<li><a class="contentUpdate" id="#run">Run</a></li>
</ul>
</div>
<!-- /navbar -->
</div>
<div id="content">
FORM
<div id="joinForm">
<form method="post">
<label for="name">Name and Surname(s)</label>
<input type="text" id="name" placeholder="Adam Smith" value="" name="name" />
<label for="email">Email</label>
<input type="text" id="email" placeholder="example#esade.edu" value="" name="email" />
<label for="phone">Phone</label>
<input type="text" id="phone" placeholder="+34 671 542 893" value="" name="phone" />
<fieldset data-role="controlgroup">
<p>Choose the sports you're interested in:</p>
<input type="checkbox" id="swimming" name="swimming" value="" />
<label for="swimming">Swimming</label>
<input type="checkbox" id="cycling" name="cycling" value="" />
<label for="cycling">Cycling</label>
<input type="checkbox" id="running" name="running" value="" />      <label for="running">Running</label>
</fieldset>
<div align="right">
<button type="submit" class="ui-shadow ui-btn ui-corner-all ui-btn-inline" name="submit" id="submit" value="submit">Submit</button>
</div>
</form>
</div>
</div>
<div class="hiddenContent swim">
swim
</div>
<div class="hiddenContent cycle">
cycle
</div>
<div class="hiddenContent run">
run
</div>
Thank you!

Getting rel of <a> tag in javascript

I have a javascript containing a form with image, radio button and text boxes.
When I click on the delete hyperlink, I want to get the rel of that link.
How can I go about getting it?
Form
<script type="text/template" id="imageTemplate">
<div class="row gc_photo" id="gc_photo_{{id}}" style=" border-bottom:1px solid #ddd; padding-bottom:20px; margin-bottom:20px;">
<div class="col-md-2">
<input type="hidden" name="images[{{id}}][filename]" value="{{filename}}"/>
<img class="gc_thumbnail" src="<?php echo base_url('../product_images/{{filename}}');?>" style="padding:5px; border:1px solid #ddd"/>
</div>
<div class="col-md-10">
<div class="row">
<div class="col-md-4">
<div class="form-group">
<input name="images[{{id}}][alt]" value="{{alt}}" class="form-control" placeholder="<?php echo lang('alt_tag');?>"/>
</div>
</div>
<div class="col-md-4">
<div class="checkbox">
<label>
<input type="radio" name="primary_image" value="{{id}}" {{#primary}}checked="checked"{{/primary}}/> <?php echo lang('main_image');?>
</label>
</div>
</div>
<div class="col-md-4">
<a onclick="return remove_image($(this));" rel="{{id}}" class="btn btn-danger pull-right"><i class="icon-times "></i></a>
</div>
</div>
<div class="row">
<div class="col-md-12">
<label><?php echo lang('caption');?></label>
<textarea name="images[{{id}}][caption]" class="form-control" rows="3">{{caption}}</textarea>
</div>
</div>
</div>
</div>
</script>
Function to delete
function remove_image(img)
{
if(confirm('<?php echo lang('confirm_remove_image');?>'))
{
var id = img.attr('rel');
alert(id);
}
}

You can make use of jQuery click handler here. Remove onclick attribute from anchor tag and write below click handler
$(function(){
$('a.btn.btn-danger').click(function(){
if(confirm('<?php echo lang('confirm_remove_image');?>'))
{
alert($(this).attr('rel'));
}
});
});

php script is not able to verify data using anchor tag

I have a login form and i know how to submit data for verifying from database using submit button but i want to submit my data using anchor tag and it must be verified using php, what i did is as follows and it's not working :
index.php
<form class="sign-form" action="login_process.php" method="post" id="lg" name="form">
<fieldset>
<div class="row">
<span class="text">
<input type="email" name="email"/>
</span>
<span class="text">
<input type="password" name="pwd"/>
</span>
<input type="submit" value="Go" class="submit" name="submit" />
</div>
<div class="row">
<label for="check-1">Remember me</label>
<input type="checkbox" class="check" id="check-1" />
Forgot your password?
<?php
if(isset($_GET['loginFailed']) && !empty($_GET['loginFailed'])) {
$msg=$_GET['loginFailed'];
echo $msg;
}
?>
</div>
</fieldset>
<div class="action_btns">
<div class="one_half">
<i class="fa fa-angle-double-left"></i> Back
</div>
<div class="one_half last">
login
</div>
</div>
</form>
login_process.php
<?php
include("connection.php");
if(isset($_POST['submit'])) {
$email=$_POST['email'];
$pwd=$_POST['pwd'];
$password=md5($pwd);
$sql="SELECT * FROM `registration` where Email='$email' AND Password='$password'";
$van=mysqli_query($var,$sql);
$count=mysqli_num_rows($van);
if ($count==1) {
echo"hello";
session_start();
$_SESSION['email'] = $email;
header("location: login_success.php");
} else {
header("location:index.php?loginFailed=wrong password or email");
}
mysqli_close($var);
}
?>

The problem is the name of the controls.
Having a control named submit in your form is overriding form.submit();
The error in the browser console is that .submit() is not a function.
So please, just change the name of the submit button with something else and it is working good.
<form class="sign-form" action="login_process.php" method="post" id="lg" name="form">
<fieldset>
<div class="row">
<span class="text">
<input type="email" name="email"/>
</span>
<span class="text">
<input type="password" name="pwd"/>
</span>
<input type="submit" value="Go" name="submit" class="submit" id="btnSubmit" />
</div>
<div class="row">
<label for="check-1">Remember me</label>
<input type="checkbox" class="check" id="check-1" />
Forgot your password?
<?php
if(isset($_GET['loginFailed']) && !empty($_GET['loginFailed'])) {
$msg=$_GET['loginFailed'];
echo $msg;
}
?>
</div>
</fieldset>
<div class="action_btns">
<div class="one_half">
<i class="fa fa-angle-double-left"></i> Back
</div>
<div class="one_half last">
Register
</div>
</div>
</form>

I understand that you want to use an anchor to submit the form instead of a button. Several solutions exists for that, but let me say to you that using an anchor to submit a form requires the use of JavaScript to hook up the event. It's not safe in that if a user has JavaScript disabled, you won't be able to submit the form. It's better if you make a submit button looks like an anchor, like following:
<input type="submit" class="submitAnchor" value="Submit">
With this minimal style declaration:
.submitAnchor {
background-color: transparent;
border: none;
text-decoration: underline;
color: blue;
cursor: pointer;
}
Now, if you do really insist on using an anchor, you can e.g:
1.Event forwarding, activate the button submit event click when the anchor event click is activated:
<form name="form_lg" action="login_process.php" method="post" class="sign-form">
...
<input type="submit" name="submit" value="Go" class="submit">
<a href="#" onclick="form_lg['submit'].click()" class="btn btn_red">
Register
</a>
2.In case you don't want to forward events, you can e.g add a hidden input to store actions, like submit, back, etc. Then, you can catch the action value in the login_process.php file:
<form name="form_lg" action="login_process.php" method="post" class="sign-form">
...
<input type="hidden" name="action" value="" />
<a href="javascript:form_lg.submit()" onclick="form_lg['action'].value='submit'"
class="btn btn_red">Register</a>
In this case, you should change this line in login_process.php file. Instead of:
if(isset($_POST['submit'])){
Do this:
if($_POST['action']=='submit') {
Hope it's helpful!

Submit Button not disappearing with ng-disabled

I've set up a form with Angular integrated into it. In this form, I want the final submit button to only show up when the form is valid. There are a number of fields, but the only fields that are required are the one's for a user'a name, email-address, and a checkbox. The form recognizes when a required field is invalid, however I can't get the submit button to disappear (and subsequently reappear).
Here's code for reference:
index.html:
<form name="captions" ng-controller="CaptionCtrl>
<div class="current-page">
<div class="pages">
<div class="page active" id="page1">
<img src="images/blank_image.jpg">
<div class="page-form">
<span>“</span>
<input type="text" ng-model="user.caption1" size="130"
placeholder="Enter your caption here.">
<span>”</span>
<br>
<button class="page-form-submit" ng-click="pageShift(2)">NEXT</button> </div>
</div>
<div class="page" id="page2">
<img src="images/blank_image.jpg">
<div class="page-form">
<span>“</span>
<input type="text" ng-model="user.caption2" size="130"
placeholder="Enter your caption here.">
<span>”</span>
<br>
<button class="page-form-submit" ng-click="pageShift(3)">NEXT</button>
</div>
</div>
<div class="page" id="page3">
<img src="images/blank_image.jpg">
<div class="page-form">
<span>“</span>
<input type="text" ng-model="user.caption3" size="130"
placeholder="Enter your caption here.">
<span>”</span>
<br>
<button class="page-form-submit" ng-click="pageShift(4)">NEXT</button>
</div>
</div>
<div class="page" id="page4">
<img src="images/blank_image.jpg">
<div class="page-form-submit-page">
<h4>TO ENTER YOUR CAPTION IN THE CONTEST, TELL US YOUR NAME AND CONTACT METHOD.</h4>
<input type="text" ng-model="user.name" size="70" placeholder="Name" required>
<input type="email" ng-model="user.email" size="70" placeholder="E-mail Address" required>
<br>
<input type="checkbox" required>I have read and accept the Terms & Conditions
<br>
<input class="page-form-submit-page-submit" ng-disabled="captions | validateFields" ng-click="captionSubmit(user)" type="submit" value="SUBMIT">
</div>
</div>
<div class="page" id="page5">
<img src="images/blank_image.jpg">
<div class="page-form-thankyou">
<span><strong>THANK YOU</strong></span>
</div>
<div class="chapter-two-story-link"><span class="yellow">CLICK TO TELL US YOUR STORY</span></div>
</div>
</div>
</div>
</form>
If you notice towards the bottom, I have a ng-disabled set with "captions | validateFields". I've tried this with a simply truthy statement as well so its not the filter I set up.
Edit: With feedback I've gotten what I initially wanted to do working with ng-show. However, ng-disabled would actually be more appropriate for what I want. I've added relevant css.
style.css
.page-form-submit-page-submit {
display: block;
padding: 5px 15px;
border: none;
border-radius: 2px;
margin: 40px 400px 20px auto;
text-align: center;
background-color: #001F45;
color: #FFD200;
}
.page-form-submit-page-submit:active {
background-color: #0250B0;
}
Can anyone explain how to get the submit button to show only after all fields are valid?

Try ng-enabled="captions.$valid" to disable (visible but not clickable) and ng-show="captions.$valid" to hide the button if the form is invalid.
More about forms in angular: https://docs.angularjs.org/api/ng/directive/form

Not tested, but you can use the $valid property of your form like this:
<input class="page-form-submit-page-submit" ng-disabled="!captions.$valid" ng-click="captionSubmit(user)" type="submit" value="SUBMIT">
But if you want the button to disappear completely, use ng-hide="!captions.$valid" instead of the ng-disabled directive

It's fairly easy
hide completly
<input class="page-form-submit-page-submit" ng-if="captions.$valid" ng-click="captionSubmit(user)" type="submit" value="SUBMIT">
visually disable
<input class="page-form-submit-page-submit" ng-disabled="captions.$invalid" ng-click="captionSubmit(user)" type="submit" value="SUBMIT">

Trouble with Submitting Custom Data to a Login Form

I have a login form that I would like to send custom POST values to. The URL looks like this: site.com/administrator/index.php
There is a login form on that page that looks like this:
function setFocus() {
document.login.username.select();
document.login.username.focus();
}
<body onload="javascript:setFocus()">
<div id="border-top" class="h_green"></div>
<div id="content-box">
<div class="padding">
<div id="element-box" class="login">
<div class="t"></div>
<div class="m">
<h1></h1>
<dl id="system-message"></dl>
<div id="section-box">
<div class="t"></div>
<div class="m">
<form id="form-login" style="clear: both;" name="login" method="post" action="index.php">
<p id="form-login-username">
<label for="modlgn_username"></label>
<input id="modlgn_username" class="inputbox" type="text" size="15" name="username"></input>
</p>
<p id="form-login-password"></p>
<p id="login-error-message"></p>
<p></p>
<p id="form-login-lang" style="clear: both;"></p>
<div class="button_holder"></div>
<div class="clr"></div>
<input type="submit" value="Login" style="border: 0; padding: 0; margin: 0; width: 0px; height: 0px;"></input>
<input type="hidden" value="com_login" name="option"></input>
<input type="hidden" value="login" name="task"></input>
<input type="hidden" value="1" name="3229cc4ec7d0ca37d4f0ff08ebca8251"></input>
I analyzed the requests that the browser was making when submitting a form with httpFox, and here is the result( this is the POST data when putting in das as the username and add as password):
username=das&passwd=asd&lang=&option=com_login&task=login&3229cc4ec7d0ca37d4f0ff08ebca8251=1
This is not an ordinary login box, and so, I do not know how to proceed. What I would like to do is be able to send requests from my browser as if I was submitting the form, but I am not sure what the final query looks like or where to send it.
Any help is appreciated.