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Javascript: Delete a div that contains (3) in a row <BR>'s in it

<div>
<br>
<br>
<br>
</div>
I have an HTML page that has the above div element in it. How can I scan the page an look for a DIV that contains specific items? In this example I know I have three <br> in a row and that's it. The DIV element does not have a class or an ID, and I would like to delete it.

You can target elements in a row by using the sibling selector, +. You can make sure the target elements are a direct child of the div by using the > selector.
You can find the div that contains the three br elements like so:
document.querySelector('div > br + br + br').parentNode;
To remove this element from the DOM use the remove method.
const elToDelete = document.querySelector('div > br + br + br')?.parentNode;
elToDelete?.remove();
Edit:
Added optional chaining syntax to the answer to show how to prevent undefined errors from being thrown.

You can use the :has pseudo-class to select the div directly
var elem = document.querySelectorAll("div:has(>br+br+br)");
console.log([...elem])
elem.forEach(x=>x.remove())
<div id=a> a
<br/>
<br/>
<br/>
</div>
<div id=b> b
<br/>
<br/>
</div>
<div id=c> c
<br/>
<br/>
<not-br/>
<br/>
</div>

You can try this:
[].slice.call(document.getElementsByTagName("div")).forEach(function(div){
var count = 0;
if(div.children.length === 3)
[].slice.call(div.children).forEach(function(br, i){
if(br.nodeName === "BR")
count++;
});
if(count > 2)
div.parentElement.removeChild(div);
});

You can just hide it with CSS
div:has(>br+br+br) {
display: none;
}
<div>1</div>
<div><br/><br/><br/></div>
<div>3</div>

Best solution that will work cross-browser is to tackle this programmatically. Note that :has() pseudo class doesn't work on Firefox, IE or Opera (see https://caniuse.com/css-has).
Here's a concise functional Javascript approach:
[].filter.call(document.querySelectorAll('div'), el => el.querySelectorAll('br').length === 3)

Show div after button click jquery

Hi I try to show a div element in jQuery mobile when the user touch the button. I already created own classes for the button and for the div element, but nothing happens. What classes should I take?
JS:
$(document).ready(function(){
$(".commentbtn").on("click", function(e) {
e.preventDefault(); // in some browsers a button submits if no type=
$(this).siblings("div.comment").toggle();
});
});
CSS:
.comment {
display:none;
}
HTML:
<?php foreach ($result as $key => $row): ?>
<div class="ui-btn-text">
<button class="commentbtn" data-rel="button">comment</button>
<div id="createcomment" class="comment" data-theme="a">
<form data-ajax="false" name="login-form" class="login-form" action="./comments.php" method="post" style="padding:20px 40px;">
<div class="content">
<textarea rows="1" name="text" id="text" class="foo"></textarea>
</div>
</form>
</div>
</div>
<?php endforeach; ?>

You haven't got any element with the class .btn-info so you wouldn't be able to call the event from:
$(".btn-info").on("click", function(e) {
e.preventDefault(); // in some browsers a button submits if no type=
$(this).closest(".comment").children(".comment").show();
});
You have an element with the class .commentbtn which you would then do the same as you did with the .btn-info
$(".commentbtn").on("click", function(e) {
e.preventDefault(); // in some browsers a button submits if no type=
// Console log the element
console.log($(this).closest(".comment").children(".comment"));
// Console log not showing the right element. So you need to get the
// sibling of the clicked button
// Instead of doing - $(this).closest(".comment").children(".comment").show();
// You can do the following
$(this).siblings("div.comment").show();
});
.closest() - looks at the element itself and its parents for a match.
.siblings - Get the siblings of each element in the set of matched elements, optionally filtered by a selector.
Example With .show();
Here an example with .toggle(); If you wanted to show/hide the comment with same button. (Just little extra for you to look at)
Example With .toggle();
UPDATE:
Example with .comment shown on load

Your button has class commentbtn, so you should use that instead of btn-info. Also, you should be looking for the sibling div, not the closest.
$(".commentbtn").on("click", function(e) {
e.preventDefault(); // in some browsers a button submits if no type=
$(this).siblings("div.comment").show();
});
JSFiddle demo

Adding "Clear Field" buttons to Bootstrap 3 inputs using jQuery + CSS class

How can I add a "Clear field" button to multiple Bootstrap 3 input fields just using jQuery and a CSS class?
I've found solutions that can add a 'clear field' button to a field with a particular ID, but nothing so far that can do it by class. I've got a form with a lot of fields and I'd rather not have to repeat my code over again for each field.
I've tried this so far (Bootply), but I can't figure out how to get jQuery to clear just the one field and toggle the one icon, not all of them.
//JS
$(document).ready(function(){
$(".searchinput").keyup(function(){
$(".searchclear").toggle(Boolean($(this).val()));
});
$(".searchclear").toggle(Boolean($(".searchinput").val()));
$(".searchclear").click(function(){
$(".searchinput").val('').focus();
$(this).hide();
});
});
//HTML
<div class="btn-group">
<input id="searchinput" type="search" class="form-control searchinput" placeholder="type something..." value="">
<span id="searchclear" class="searchclear glyphicon glyphicon-remove-circle"> </span>
</div>
<div class="btn-group">
<input id="searchinput" type="search" class="form-control searchinput" placeholder="type something..." value="">
<span id="searchclear" class="searchclear glyphicon glyphicon-remove-circle"></span>
</div>
//CSS
.searchinput {
width: 200px;
}
.searchclear {
position:absolute;
right:5px;
top:0;
bottom:0;
height:14px;
margin:auto;
font-size:14px;
cursor:pointer;
color:#ccc;
}

1) You can use $(this) to get a reference to the current targeted element
2) Use .next() to toggle the visibility for only the icon which is the next immediate sibling of input that you're currenlty key in
3) Use .prev() to clear only the input which is the immediate previous sibling of clear icon that is clicked:
Final code should look like:
$(document).ready(function () {
$(".searchinput").keyup(function () {
$(this).next().toggle(Boolean($(this).val()));
});
$(".searchclear").toggle(Boolean($(".searchinput").val()));
$(".searchclear").click(function () {
$(this).prev().val('').focus();
$(this).hide();
});
});
Bootply Demo

Try changing your javascript code to this:
$(document).ready(function(){
$(".searchinput").keyup(function(){
$(this).parent().find('.searchclear').toggle(Boolean($(this).val()));
});
$(".searchclear").toggle(Boolean($(".searchinput").val()));
$(".searchclear").click(function(){
$(this).parent().find('.searchinput').val('').focus();
$(this).hide();
});
});
Essentially what it does is add scope to the clear buttons so that it is limited to the sibling. There are other jQuery functions that might be more specific, but this should work.
http://www.bootply.com/130368

Another option would be to use .siblings() to make sure you are targeting just the siblings with the searchclear class.
$(document).ready(function(){
$(".searchinput").keyup(function(){
$(this).siblings(".searchclear").toggle(Boolean($(this).val()));
});
$(".searchclear").toggle(Boolean($(".searchinput").val()));
$(".searchclear").click(function(){
$(".searchinput").val('').focus();
$(this).hide();
});
});
http://www.bootply.com/130369

traverse element inside the div

html:
<div style="width: 260px;margin:25px 0 0 30px">
<input type="checkbox" name="send_email" class="delete_followup" />Send email alerts
<input type="checkbox" value="delete" type="checkbox" />Send SMS alerts <button type="submit" name="delete" value="{{follower.id}}" class="delete_follower">Delete</button>
</div>
js:
$(".delete_followup").click(function(){
var $this = $(this);
$(this).find(".delete_follower").show();
});
I want to show the hidden button on clicking the delete_followup class.i TRIED WITH ABOVE jQuery but not working.

Or try .nextAll:
$(this).nextAll(".delete_follower").show();
Working here: http://jsfiddle.net/tw5XK/

The delete_follower element is not a decedent of delete_followup element, it is a sibling element so instead of find() you need to use siblings()
$(".delete_followup").click(function(){
var $this = $(this);
$this.siblings(".delete_follower").show();
});

You are trying to search downward into the div, when you already have a reference to the element you want. Making it way more complicated than it needs to be lol
$(".delete_followup").click(function(){
$(this).show();
});
Whenever you trigger off a click event, the actual element clicked on is passed through as the scope of the function. Since you are triggering off the click of ".delete_followup", that div is your element scope

Try this:
$(".delete_followup").click(function () {
if (this.checked) {
$(this).siblings(".delete_follower").show();
} else {
$(this).siblings(".delete_follower").hide();
}
});
Demo here

When div is clicked, check corresponding radio input jquery

Here's my problem, I want an entire div to be click able, when clicked I need the radio button contained in the div to be checked, so the div acts as a radio itself. Here's what I thought I could use;
$('#content').click(function(e) {
$('input:radio[name="id_"]').prop('checked', true);
});
But this is not selecting the relative radio inside the div. I think I can use a this selector, am I right?

You don't give any code, so I guess:
DEMO
See my demo on CodePen
HTML
<div class="content">
<input type="radio" name="foo">
</div>
<div class="content">
<input type="radio" name="foo">
</div>
<div class="content">
<input type="radio" name="foo">
</div>
CSS (for example)
.content {
float: left;
width: 100px;
padding-top: 100px;
background-color: #eee;
margin-left: 10px;
}
JS (JQUERY)
$('.content').click(function(){
$(this).find('input[type=radio]').prop('checked', true);
})

Yes you can use the this selector. I have made a quick jsfiddle to show you an example.

This should do it.
$('input:radio[name*="id_"]'), assuming the name starts with id_
And yes you can use this. Use it to filter down its children like:
$(this).children('input:radio[name*=id_]').prop("checked", true)
The key is using name*=id_
This means select element whose name starts with id_. Isn't that what you wanted ?

$('#content').click(function(){
$(this).children('radio').attr('checked','checked')
})

building on Deif's solution this will toggle the checked status when clicking on the div
fiddle
<div id="content">
Some content
<input type="radio" id="radio1" value="test" />
</div>
<script type="text/javascript">
$('#content').click(function () {
var val = $(this).find('input:radio').prop('checked')?false:true;
$(this).find('input:radio').prop('checked', val);
});
</script>

Try with this:
$('div').click(function(){
if( $('div').find('input:checkbox').prop("checked") == true){
$('div').find('input:checkbox').prop("checked", false);
}
else{
$('div').find('input:checkbox').prop("checked", true);
}
});
LIVE DEMO