Develop Reference

How can I hide a div until a button is clicked?

I'm trying to create 3 divs that are hidden when the page load, so that when I click their respective buttons they show up, however, no matter what I do, I cannot get them to show up with the button click.
Here is the relevant part of the code:
My div and button:
<button onclick="TestsFunction()">Tests</button>
<div id="TestsDiv" style="display:none">
tests here!
</div>
And the JS used to show it:
function TestsFunction() {
var T = document.getElementById("TestsDiv");
T.style.display = "none";}
I can successfully hide the div when I load the page, however after I click the button it doesn't show up again.
I tried
window.onload = function(){
document.getElementById('TestsDiv').style.display = 'none';
}
Instead of style="display:none" on the div to see if the way I hid it was the problem, but the div still wouldn't show up.
I'm a beginner and I'm not good with JS, HTML or PHP, if possible can someone both help and explain my mistake? Do I need something else in my code? I tried reading similar threads but the solutions were all too complicated for my understanding and I ended up not being able to fix my problem. Thank you!

You need to set display to block (or something else) but not hide when button is clicked!
function TestsFunction() {
var T = document.getElementById("TestsDiv");
T.style.display = "block"; // <-- Set it to block
}
<button onclick="TestsFunction()">Tests</button>
<div id="TestsDiv" style="display:none">
tests here!
</div>

try
function TestsFunction() { TestsDiv.style.display = 'block' }
function TestsFunction() { TestsDiv.style.display = 'block' }
<button onclick="TestsFunction()">Tests</button>
<div id="TestsDiv" style="display:none">
tests here!
</div>

You need to adapt your function to toggle the display of the div. Currently it is only hiding it - but if its already hidden, remove the display = "none" to show it again. You remove it by setting the display style to an empty string (which makes it default).
function TestsFunction() {
var T = document.getElementById("TestsDiv"),
displayValue = "";
if (T.style.display == "")
displayValue = "none";
T.style.display = displayValue;
}
<button onclick="TestsFunction()">Tests</button>
<div id="TestsDiv" style="display:none">
tests here!
</div>
If you only want it to be shown, and not to be able toggle display on and off, just set it to the empty string right away.
function TestsFunction() {
document.getElementById("TestsDiv").style.display = "";
}
<button onclick="TestsFunction()">Tests</button>
<div id="TestsDiv" style="display:none">
tests here!
</div>

You should look into jQuery's hide() and show() methods. They take care of setting the styles for you.
https://www.w3schools.com/jquery/jquery_hide_show.asp

do like this =>
function TestsFunction(){
$("#TestsDiv").css("display","block")
}
before that you should include jquery cdn.
thank you.

Click outside an element doesn't work

I have this code:
function showAll(el){
var id = el.parentNode.id;
var all= document.getElementById(id).getElementsByClassName('items')[0];
if(all.style.display === 'block'){
all.style.display = 'none';
} else{
all.style.display = 'block';
window.addEventListener('mouseup', function(e){
document.getElementById('test').innerHTML = e.target.className;
if(e.target != all){
all.style.display = 'none';
}
});
}
}
<div id="parent">
<div class="selected" onClick="showAll(this);">
</div>
<div class="items" style="display: none">
</div>
</div>
Basically what i want to achieve is: click on selected to display items which is now hidden after that if i click again on selected or if i click outside of items(a random spot on that page or even on selected) i want to be able to hide items.
The problem is that without the EventListener when i click on selected it works to display items and then if i click again on selected it works to hide items but if i click on a random spot it doesn't work to close items.
But when i add EventListener and i click on selected it works to click a random spot to close items but it doesn't work to click selected again to close items.
Can anybody help me with a full JavaScript explanation, please?

You're going to want to use highly reusable code. I use change() and id_() on my web platform all of the time and it's very direct and simple. In the below example the second parameter will make the class empty (you can also use id_('items').removeAttribute('class') for a cleaner DOM (Document Object Model)).
HTML
<input onclick="change(id_('items','');" type="button" value="Display Items" />
<div clas="hidden" id="items"><p>Items here.</p></div>
CSS
.hidden {display: none;}
JavaScript
function change(id,c)
{
if (id_(id)) {id_(id).className = c; if (id_(id).className=='') {id_(id).removeAttribute('class');}}
else if (id) {id.className = c; if (id.className=='') {id.removeAttribute('class');}}
else {alert('Error: the class id \''+id+'\' was not found or has not yet been imported to the DOM.\n\nNew class intended: '+c);}
}
function id_(id)
{
if (id == '' && window['console']) {console.log('Developer: empty id called from: '+id_.caller.toString().split('function ')[1].split('(')[0]);}
return (document.getElementById(id)) ? document.getElementById(id) : false;
}
This code exists from years of refining the same platform instead of industry standard drama of pointlessly changing things. You are two clicks from finding more highly reusable functions on my platform's JavaScript documentation from the link in my profile.

Toggling Background Color on Click with Javascript

I am working on a class project and need to be able to toggle the background color of a transparent png on click. I have been working through a number of examples from the site, but I can't get it working. I am a total novice at Javascript and haven't had luck trying to plug in jQuery code either.
Here is the targeted section:
<div class="expenseIcon"><a href="#">
<img src="images/mortgage.png"></a><br/>
<p>Rent or Mortgage</p>
</div>
On clicking the linked image, the goal is for the background on the image to change to green. Clicking it again would change it back to the default, white. Here's the CSS I'd like to toggle on/off with click.
.colorToggle {
background: #A6D785;
}
I had tried adding class="iconLink" to the href and class="iconBox" to the image with the following Javascript adapted from another post, but it didn't work.
var obj = {};
$(document).ready(function () {
$(".iconLink").click(function () {
var text = $(this).find(".iconBox");
obj.var1 = text;
//alert(obj.var1);
//return false;
$('.iconBox').removeClass('colorToggle');
$(this).addClass('colorToggle')
});
});
Any advice would be greatly appreciated!

Let's break down what is happening with your current code when you click the link.
var obj = {};
$(document).ready(function () {
$(".iconLink").click(function () {
var text = $(this).find(".iconBox");
obj.var1 = text;
$('.iconBox').removeClass('colorToggle');
$(this).addClass('colorToggle')
});
});
JQuery finds all elements with the classname "iconBox". In your case, this is the img element. The reference to that element is then saved in "obj.var1". You do not end up doing anything with this reference, so these two lines can be removed.
All elements with the class "iconBox" have the class "colorToggle" removed. Your img element didn't have this class on it, so nothing happens.
The class "colorToggle" is added to the anchor element. Yes! Now the element wrapping the img has a background color.
Unfortunately, clicking the anchor tag again won't do anything, since the anchor tag will already have the "colorToggle" class and all we would be doing would be trying to add it again. Hmm. Let's try changing addClass to toggleClass. Here's our new code:
$(document).ready(function () {
$(".iconLink").click(function () {
$(this).toggleClass('colorToggle');
}
});
Also, note that because we're working with the anchor element, the p element won't be affected by this change. If you want the entire div to change background colors, use this line instead:
$(".expenseIcon").toggleClass('colorToggle');

Using the given markup:
<!-- to toggle the bg-color onClick of anchor tag -->
<div class="expenseIcon">
<a href="#">
<img src="images/mortgage.png">
</a>
<br/>
<p>Rent or Mortgage</p>
</div>
since the question asks for javascript, heres an option for updating the background-color of an element using the built-in js.style method
//get a handle on the link
//only one element w/ className 'expenseIcon'
//first child of 'expenseIcon' is the anchor tag
var link = document.getElementsByClassName('expenseIcon')[0].children[0];
//get a handle on the image
var image = link.children[0];
//listen for click on link & call bgUpdate()
link.addEventListener('click', bgUpdate, false);
function bgUpdate() {
if(image.style.backgroundColor === 'lightgoldenrodyellow'){
image.style.backgroundColor = 'aliceblue';
} else if (image.style.backgroundColor === 'aliceblue') {
image.style.backgroundColor = 'lightgoldenrodyellow';
}
else console.log('image bgColor: ' + image.style.backgroundColor);
}
a similar example

css
.expenseIcon{
background: red;
}
.colorToggle {
background: blue;
}
jquery
$(".expenseIcon").click(function () {
$('.expenseIcon').toggleClass('colorToggle');
});
By default, the div will have expenseIcon background. ToggleClass will toggle the div class with colorToggle so will override the previous color.
You don't need an hyperlink tag A to manage clicks, just put it on the DIV.

Simple Way to Switch a CSS Class in Javascript

I appreciate all the suggestions I've gotten so far-thank you!
I'll try to describe a bit better what I'm trying to do:
I want to switch a CSS class on the active (clicked on) tab item on a item (to make a highlight effect while its related content is showing).
The JS Fiddle http://jsfiddle.net/4YX5R/9/ from Vlad Nicula comes close to what I'm trying to achieve, however I can't get it to work in my code.
The tabs are linked to content which is shown on the page when the tab is clicked. This part is working fine. I just want to change the CSS style on the ContentLink items when its content is being shown.
I'd also like to keep the content for ContentLink1 visible when the page loads, as it is now in the code, and for ContentLink1 to have the CSS .infoTabActive class when the page loads. When the ContentLink tab is not clicked, it should have the .infoTab class.
This is what I have so far:
HTML:
<article class="grid-70 infoContainer">
<a class="infoTab" id="aTab" href="javascript:show('a')">ContentLink1</a>
<a class="infoTab" id="bTab" href="javascript:show('b')">ContentLink2</a>
<a class="infoTab" id="cTab" href="javascript:show('c')">ContentLink3</a>
<div id="a">
<p> Inhalt 1111111.</p></div>
<div id="b">
<p>Inhalt 222222222
</p></div>
<div id="c">
<p>Inhalt 33333333
<7p></div>
</article>
Javascript:
window.onload = function () {
document.getElementById("a").style.display = "block";
}
function show(i) {
document.getElementById('a').style.display ="none";
document.getElementById('b').style.display ="none";
document.getElementById('c').style.display ="none";
document.getElementById(i).style.display ="block";
}
basic CSS for tab styles I want to apply:
.infoTab {
text-decoration:none;
color:red;
}
.infoTabActive {
text-decoration:none;
color:yellow;
}
Any pointers would be appreciated!

You can switch the classes simply bu using class property on DOM element.
To replace the existing class use
document.getElementById("Element").className = "ClassName";
Similarly to add a new class to exisiting classes use
document.getElementById("Element").className += "ClassName";

Change show function to be like this:
function show(i) {
document.getElementById('a').style.display ="none";
document.getElementById('a').className ="";
document.getElementById('b').style.display ="none";
document.getElementById('b').className ="";
document.getElementById('c').style.display ="none";
document.getElementById('c').className ="";
document.getElementById(i).style.display ="block";
document.getElementById(i).className ="selected";
}

I changed a little bit your code to make it suits your needs.
First, change the onload part in the Fiddle, by no wrap.
Then, you need to hide each elements at start like this :
window.onload = function () {
var list = document.getElementsByClassName("hide");
for (var i = 0; i < list.length; i++) {
list[i].style.display = "none";
}
}
I added an hide class to achieve it. Your show function works well then.

I would do it like this:
add a class called .show which sets the element to display block.
then toggle the classname.
Here's a JSFiddle
And here's an example:
HTML
<article class="grid-70 infoContainer">
<a class="infoTab" id="aTab" href="javascript:show('a')">Werbetexte</a>
<a class="infoTab" id="bTab" href="javascript:show('b')">Lektorate</a>
<a class="infoTab" id="cTab" href="javascript:show('c')">Übersetzung</a>
<div class="box" id="a">
<div class="col1"> <p>Inhalt 1111111.</p></div>
</div>
<div class="box" id="b">
Inhalt 222222222
</div>
<div class="box" id="c">
Inhalt 33333333
</div>
</article>
JavaScript
window.onload = function () {
show('a');
}
function show(elm) {
// get a list of all the boxes with class name box
var shown = document.getElementsByClassName('box');
// loop through the boxes
for( var i=0; i<shown.length; i++ )
{
// set the classname to box (removing the 'show')
shown[i].className = 'box';
}
// change the classname to box show for the element that was clicked
document.getElementById( elm ).className = 'box show';
}
CSS
.box {
display:none;
}
.box.show {
display:block;
}

Simplest way I could think of is this : http://jsfiddle.net/4YX5R/9/
Basically you don't want to listen to each element. If you do that you will have issues with new tabs. If you listen to the parent element like in my example you can add new tabs without having to write any more javascript code.
<a class="infoTab" data-target='a' id="aTab">Werbetexte</a>
Each tab button has a data-target attribute that will describe the div to show as the tab content. Hiding and showing content will be done via css, not style - which is a recommended best practice -.
tabs.addEventListener("click", function ( ev ) {
var childTarget = ev.originalTarget || ev.toElement;
...
}
When a tab is clicked, we check to see which element was clicked from the event listener on the parent, and then get the data-target from it. We use this as a id selector to show the new tab. We also need a reference to the old tab that was active, so we can hide it.
The logic is not that complicated, and with this you can have any number of tabs. I would recommend jQuery for this, since the event delegation might not work in all browsers with the current code.
I hope this helps :)

Show div once clicked and hide when clicking outside

I'm trying to show the #subscribe-pop div once a link is clicked and hide it when clicking anywhere outside it. I can get it to show and hide if I change the:
$('document').click(function() {
TO
$('#SomeOtherRandomDiv').click(function() {
HTML:
<div id="footleft">
Click here to show div
<div id="subscribe-pop"><p>my content</p></div>
</div>
Script:
<script type="text/javascript">
function toggle_visibility(id) {
var e = document.getElementById("subscribe-pop");
if(e.style.display == 'block')
e.style.display = 'none';
else
e.style.display = 'block';
}
}
$('document').click(function() {
$('#subscribe-pop').hide(); //Hide the menus if visible
});
$('#subscribe-pop').click(function(e){
e.stopPropagation();
});
</script>

You have to stop the event propagation in your container ('footleft' in this case), so the parent element don't notice the event was triggered.
Something like this:
HTML
<div id="footleft">
<a href="#" id='link'>Click here to show div</a>
<div id="subscribe-pop"><p>my content</p></div>
</div>
JS
$('html').click(function() {
$('#subscribe-pop').hide();
})
$('#footleft').click(function(e){
e.stopPropagation();
});
$('#link').click(function(e) {
$('#subscribe-pop').toggle();
});
See it working here.

I reckon that the asker is trying to accomplish a jquery modal type of display of a div.
Should you like to check this link out, the page upon load displays a modal div that drives your eye into the center of the screen because it dims the background.
Moreover, I compiled a short jsFiddle for you to check on. if you are allowed to use jquery with your requirements, you can also check out their site.
Here is the code for showing or hiding your pop-up div
var toggleVisibility = function (){
if($('#subscribe-pop').is(":not(:visible)") ){
$('#subscribe-pop').show();
}else{
$('#subscribe-pop').hide();
}
}

Changing $(document).click() to $('html').click() should solve the main problem.
Secondly, you do not need the toggle_visibility() function at all, you can simply do:
$('#subscribe-pop').toggle();
Ref: changed body to html as per this answer: How do I detect a click outside an element?