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How do I stop this JS 'show and hide' button from revealing the content at first?

Basically, I have 3 images and once the button is clicked it displays those images, however, when the page is loading up, the button is already toggled on and displays the images, once you click on it the images go. So the button works, but it starts off with displaying the contents which is not what I want.
var a;
function show_hide()
{
if(a==1)
{
document.getElementById("image").style.display="inline";
return a=0;
}
else
{
document.getElementById("image").style.display="none";
return a=1;
}
}
<div id="image">
<img class= "tree1" src="img/tree1.jpeg">
<img class= "tree2" src="img/tree2.jpeg">
<img class= "tree3" src="img/roots.jpeg">
</div>
<div>
<button onclick="show_hide()">Click to Reveal</button>
</div>
<script src="showhideelement.js"></script>

You can assign a = 1 and make your div to display none.
HTML:
<div id="image" style="display: none">
<img class= "tree1" src="img/tree1.jpeg">
<img class= "tree2" src="img/tree2.jpeg">
<img class= "tree3" src="img/roots.jpeg">
</div>
<div>
<button onclick="show_hide()">Click to Reveal</button>
</div>
JS:
var a = 1;
function show_hide()
{
if(a==1)
{
document.getElementById("image").style.display="inline";
return a=0;
}
else
{
document.getElementById("image").style.display="none";
return a=1;
}
}

You can use a class to define the style which you can toggle on clicking the button using DOMTokenList.toggle().
Also, I will suggest you to avoid inline event handler.
Demo:
document.querySelector('button').addEventListener('click', show_hide);
function show_hide()
{
document.getElementById("image").classList.toggle('showHide');
}
.showHide{
display: none;
}
<div id="image" class="showHide">
<img class= "tree1" src="img/tree1.jpeg">
<img class= "tree2" src="img/tree2.jpeg">
<img class= "tree3" src="img/roots.jpeg">
</div>
<div>
<button>Click to Reveal</button>
</div>
<script src="showhideelement.js"></script>

That's it just assign the value of 0 to the var before doing anything and call the function. It was that easy. I hope I solved your query you can run this code snippet to check if it works!
Thanks!
var a = 0;
show_hide()
function show_hide()
{
if(a==1)
{
document.getElementById("image").style.display="inline";
return a=0;
}
else
{
document.getElementById("image").style.display="none";
return a=1;
}
}
<div id="image">
<img class= "tree1" src="img/tree1.jpeg">
<img class= "tree2" src="img/tree2.jpeg">
<img class= "tree3" src="img/roots.jpeg">
</div>
<div>
<button onclick="show_hide()">Click to Reveal</button>
</div>
<script src="showhideelement.js"></script>

Javascript function to rotate some div elements on page

I have some javascript function - shows me a popup with some texts. I try to rotate two "section" elements, but if I add to HTML one more section with class custom, the page shows only first element. Please, help me to add 1-2 more elements and to rotate it. The idea is to have 2 or more elements with class custom and to show it in random order, after last to stop. Thanks.
setInterval(function () {
$(".custom").stop().slideToggle('slow');
}, 2000);
$(".custom-close").click(function () {
$(".custom-social-proof").stop().slideToggle('slow');
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<section class="custom">
<div class="custom-notification">
<div class="custom-notification-container">
<div class="custom-notification-image-wrapper">
<img src="checkbox.png">
</div>
<div class="custom-notification-content-wrapper">
<p class="custom-notification-content">
Some Text
</p>
</div>
</div>
<div class="custom-close"></div>
</div>
</section>

Set section display none of page load instead of first section. Check below code of second section:
<section class="custom" style=" display:none">
<div class="custom-notification">
<div class="custom-notification-container">
<div class="custom-notification-image-wrapper">
<img src="checkbox.png">
</div>
<div class="custom-notification-content-wrapper">
<p class="custom-notification-content">
Mario<br>si kupi <b>2</b> matraka
<small>predi 1 chas</small>
</p>
</div>
</div>
<div class="custom-close"></div>
</div>
</section>
And you need to make modification in your jQuery code as below:
setInterval(function () {
var sectionShown = 0;
var sectionNotShown = 0;
$(".custom").each(function(i){
if ($(this).css("display") == "block") {
sectionShown = 1;
$(this).slideToggle('slow');
} else {
if (sectionShown == 1) {
$(this).slideToggle('slow');
sectionShown = 0;
sectionNotShown = 1;
}
}
});
if (sectionNotShown == 0) {
$(".custom:first").slideToggle('slow');
}
}, 2000);
Hope it helps you.

Filter users by data-attribute Jquery

I am trying to filter users by its data attribute , I have main div called user-append which contains users that I get from ajax get request , there can be 3 users or 100 users, its dynamical , this is my div with one user for the moment
<div id="user-append">
<div class="fc-event draggable-user" data-profesion="'+user.profesion+'" id="user_'+user.id+'" style="z-index: 9999;">
<div class="container-fluid">
<input type="hidden" value="'+user.id+'" id="user_'+ user.id + '_value" class="userId">
<div class="row" style="justify-content: center;">
<div class="col-xs-3 avatar-col">
<div class="innerAvatarUserLeft">
<img src="'+getUserImage(user.avatar)+'" width="100%" style="margin: 0 auto;">
</div>
</div>
<div class="col-xs-9 data-col">
<p class="fullName dataText">'+user.fullName+'</p>
<p class="usr_Gender dataText">Male</p>
<div style="position: relative">
<li class="availableUnavailable"></li>
<li class="usr_profesion dataText">AVAILABLE</li>
</div>
<p class="user_id" style="float:right;margin: 3px">'+user.employee_id+'</p>
</div>
</div>
</div>
</div>
</div>
as you can see I have data-profesion attribute from which I am trying to filter users depend on the profession that they have , I get the ajax request like this
$.ajax({
url: "/rest/users",
success: function (users) {
var options = [];
$user = $("#append_users");
$.each(users, function (i, user) {
options.push({
'profession': user.prof.Profession,
'gender': user.prof.Gender
});
userArr.push({
'id': user.id,
'firstName': user.prof.FirstName,
'lastName': user.prof.LastName,
'fullName': user.prof.FirstName + ' ' + user.profile.LastName,
'email': user.email,
'avatar': user.prof.Photo,
'profesion': user.prof.Profession
});
$('#filterByProfession').html('');
$('#filterByGender').html(''); // FIRST CLEAR IT
$.each(options, function (k, v) {
if (v.profession !== null) {
$('#filterByProfession').append('<option>' + v.profession + '</option>');
}
if (v.gender !== null) {
$('#filterByGender').append('<option>' + v.gender + '</option>');
}
});
});
});
and now I am trying to filter the users by its data-profesion, on change of my select option which I populate from the ajax get request , It should show only the users that contain that data-profesion value , something like this
$('#filterByProfession').change(function () {
var filterVal = $(this).val();
var userProfVal = $(".fc-event").attr("data-profesion");
if (filterVal !== userProfVal) {
}
});

You can use a CSS selector to find those users, and then hide them:
$('#filterByProfession').change(function () {
// first hide ALL users
$('.draggable-user').hide()
// then filter out the ones with the correct profession:
// (you need to escape the used quote)
.filter('[data-profesion="' + $(this).val().replace(/"/g, '\\"') + '"]')
// ... and show those
.show();
});

You're trying to get the userProfVal throughout a className selector which can return more than one element.
var userProfVal = $(".fc-event").attr("data-profesion");
^
Use the jQuery function .data() to get data attributes.
Look at this code snippet using the .each to loop over all elements returned by this selector .fc-event:
$('#filterByProfession').change(function() {
var filterVal = $(this).val();
$(".fc-event").hide().each(function() {
if ($(this).data("profesion") === filterVal) {
$(this).show();
}
});
});
Example with static data
$('#filterByProfession').change(function() {
var filterVal = $(this).val();
$(".fc-event").hide().each(function() {
if ($(this).data("profesion") === filterVal) {
$(this).show();
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id='filterByProfession'>
<option>-----</option>
<option>Developer</option>
<option>Cloud computing</option>
</select>
<div id="user-append">
<div class="fc-event draggable-user" data-profesion="Developer" id="user_1" style="z-index: 9999;">
<div class="container-fluid">
<input type="hidden" value="1" id="user_1_value" class="userId">
<div class="row" style="justify-content: center;">
<div class="col-xs-3 avatar-col">
<div class="innerAvatarUserLeft">
<img src="'+getUserImage(user.avatar)+'" style="margin: 0 auto;">
</div>
</div>
<div class="col-xs-9 data-col">
Developer
<p class="fullName dataText">Ele</p>
<p class="usr_Gender dataText">Male</p>
<div style="position: relative">
<li class="availableUnavailable"></li>
<li class="usr_profesion dataText">AVAILABLE</li>
</div>
<p class="user_id" style="float:right;margin: 3px">11</p>
</div>
</div>
</div>
</div>
</div>
<div id="user-append">
<div class="fc-event draggable-user" data-profesion="Cloud computing" id="user_2" style="z-index: 9999;">
<div class="container-fluid">
<input type="hidden" value="2" id="user_2_value" class="userId">
<div class="row" style="justify-content: center;">
<div class="col-xs-3 avatar-col">
<div class="innerAvatarUserLeft">
<img src="'+getUserImage(user.avatar)+'" style="margin: 0 auto;">
</div>
</div>
<div class="col-xs-9 data-col">
Cloud computing
<p class="fullName dataText">Enri</p>
<p class="usr_Gender dataText">Male</p>
<div style="position: relative">
<li class="availableUnavailable"></li>
<li class="usr_profesion dataText">AVAILABLE</li>
</div>
<p class="user_id" style="float:right;margin: 3px">11</p>
</div>
</div>
</div>
</div>
</div>
See? the sections are being hidden according to the selected option.

Try using this
$(".fc-event[data-profesion='" + filterVal + "']").show();
$(".fc-event[data-profesion!='" + filterVal + "']").hide();

Close a bootstrap row and start new row after every nth containing div

I have a bootstrap row which will be populated by, let's say, blog post thumbnails.
<section class="container">
<div class="row thumbs">
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
</div>
<hr class="divider" />
<div class="navigation">navigation</div>
</section
I want to close a row, insert hr tag and open a new bootstrap row after every 4th post thumbnail.
<section class="container">
<div class="row thumbs">
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
</div>
<hr class="divider" />
<div class="row">
<div class="col-sm-3">content</div>
</div>
<hr class="divider" />
<div class="navigation">navigation</div>
</section>
Is there a way to do this with jquery?

Can do something like this:
var $mainElem = $('.row'),/* adjust selector to suit page*/
$parent = $mainElem.parent(),
/* remove children after 4th from existing row */
$items = $mainElem.children(':gt(3)').detach();
if ($items.length) {
/* create new row for every 4 items removed above */
for (var i = 0; i < $items.length; i = i + 4) {
var $row = $('<div class="row">').append($items.slice(i, i + 4));
$parent.append('<hr class="divider">').append($row);
}
}
DEMO

This worked best for me:
var $d = $('.thumbs');
var $p = $('.col-sm-3:gt(3)', $d);
if ($p.length) {
$('<div class="row thumbs">').insertAfter($d).append($p);
$('<hr class="divider">').insertAfter($d);
}

Depending on your motivation to wrap each set of columns in a new row, you can style every nth row with straight CSS.
In bootstrap, if you have extra columns that spillover past 12, they just wrap into a new line anyway, so having the new row is usually redundant, although you might have some external reason to keep it in your case.
Either way, here's a CSS solution that adds a page wide horizontal divider every 4 divs:
Demo in jsFiddle & Stack Snippets
.container .row.thumbs div:nth-child(4n) {
position: static;
}
.container .row.thumbs div:nth-child(4n):after {
content: ' ';
border-top: 1px solid black;
display: block;
position: absolute;
width: 95%;
margin-left: 2.5%;
left: 0;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.css" rel="stylesheet"/>
<section class="container">
<div class="row thumbs">
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
<div class="col-sm-3">content</div>
</div>
<div class="navigation">navigation</div>
</section>
Also, bear in mind that this won't be natively supported in < IE8

Conditional innerhtml change

Let's say I have an HTML structure like this:
<li id="jkl">
<div class="aa">
<div class="bb">
<div class="cc">
<div class="dd">
<a ...><strong>
<!-- google_ad_section_start(weight=ignore) -->Test
<!-- google_ad_section_end --></strong></a>
</div>
</div>
</div>
<div class="ee">
<div class="ff">
<div class="gg">
<div class="excludethis">
<a...>Peter</a>
</div>
</div>
</div>
</div>
</div>
</li>
My goal is to set the content(innerhtml) of <li id="jkl"> to '' if inside of <li id="jkl"> there is any word of a list of words(In the example below, Wortliste) except when they are in <div class="excludethis">.
In other words, ignore <div class="excludethis"> in the checking process and show the html even if within <div class="excludethis"> there are one or more words of the word list.
What to change?
My current approach(that does not check for <div class="excludethis">)
Wortliste=['Test','Whatever'];
TagListe=document.selectNodes("//li[starts-with(#id,'jk')]");
for (var Durchgehen=TagListe.length-1; Durchgehen>=0; Durchgehen--)
{
if (IstVorhanden(TagListe[Durchgehen].innerHTML, Wortliste))
{
TagListe[Durchgehen].innerHTML = '';
}
}
with
function IstVorhanden(TagListeElement, Wortliste)
{
for(var Durchgehen = Wortliste.length - 1; Durchgehen>=0; Durchgehen--)
{
if(TagListeElement.indexOf(Wortliste[Durchgehen]) != -1)
return true;
}
return false;
}
Only has to work in opera as it's an userscript.