Develop Reference

jQuery - doesn't react to hasClass()

The jQuery hasClass() isn't working as it should. When I click on text it should give it a class (and it does), but it doesn't check if it has that class?
There is my code!
$(document).ready(function() {
$('#example').on('click', function() {
$(this).addClass("redText");
});
if ( $('#example').hasClass("redText") ) {
$('#example').addClass("bigText");
}
});
.redText{
color: red;
}
.bigText{
font-size: 20px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="example">Hey</div>

You're only adding the redText class when you click the div. When the if runs that class has not yet been added.
You need to either move the if into your click function, or remove the click function entirely.

I think you might want to do this, but I'm not completely sure;
$(document).ready(function() {
$('#example').on('click', function() {
if ( $('#example').hasClass("redText") ) {
$('#example').addClass("bigText");
}
else{
$(this).addClass("redText");
}
});
This is a total guess, can you please try to explain what it is that you are trying to achieve in more detail.

Your doing your if test only once when the page loads. You'd want to do that test when the element gets clicked and to show that, I've changed addClass to toggleClass so you can keep clicking.
$(document).ready(function() {
$('#example').on('click', function() {
$(this).toggleClass("redText");
if ( $('#example').hasClass("redText") ) {
$('#example').addClass("bigText");
}
});
});
.redText{
color: red;
}
.bigText{
font-size: 20px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="example">Hey</div>

What you are trying to do can be achieved in a single statement like below:
$('#example').on('click', function() {
$(this).addClass("redText bigText");
});
The reason why your code is not working is because: Upon document load, first click listener gets registered. After which if() statement executes which does a lookup on all the redText class elements and finds none, and thus no bigText class gets added. Its not a LIVE listener that you are trying to achieve.

Reset function once you already click it

Hi im new on js and honestly speaking we're just starting learning js on our school. What i want to do is once i already click it it will be reset and remove the class again. "myClass has a display none"
$(function() {
$("body").click(function() {
$(".parela").addClass('myClass');
});
});

You can use toggleclass
$(function() {
$("body").click(function() {
$(".parela").toggleClass('myClass');
});
});

Use toggleClass, so at every click it will be added/removed automatically
$(function() {
$("body").click(function() {
$(".parela").toggleClass('myClass');
});
});

You want to use toggleClass() which will toggle the class on and off depending on the click. note that for the demo below - I created the button that toggles the class on the button click.
Another way of doing it - since the only effect is to hide the element - is just .toggle() which toggles the display state without the use of the added class. The following snippet shows both methods.
$(function() {
$("#toggleButton").click(function() {
$(".parela").toggleClass('myClass');
});
$("#toggleButton2").click(function() {
$(".parela2").toggle();
});
});
.myClass{display:none}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>Using .toggleClass('myClass')</p>
<button type="button" id="toggleButton">clickMe</button>
<span class="parela"> Visible</span>
<hr/>
<p>Using just .toggle()</p>
<button type="button" id="toggleButton2">clickMe</button>
<span class="parela2"> Visible</span>

You can you use some sort of 'flag' variable to control the state.
You can name it whatever you want and make if statement to make decisions accordingly.
$(function() {
var flag = false;
$("body").click(function() {
if(!flag) {
$(".parela").addClass('myClass');
flag = true;
} else {
$(".parela").removeClass('myClass');
flag = false;
}
});
});

html div onclick event

I have one html div on my jsp page, on that i have put one anchor tag, please find code below for that,
<div class="expandable-panel-heading">
<h2>
<a id="ancherComplaint" href="#addComplaint"
onclick="markActiveLink(this);">ABC</a>
</h2>
</div>
js code
$('.expandable-panel-heading:not(#ancherComplaint)').click(function () {
alert('123');
});
function markActiveLink(el) {
alert($(el).attr("id"));
}
here I when I click on div I got alert with 123 message, its fine but when I click on ABC I want message I want to call markActiveLink method.
JSFiddle
what is wrong with my code? please help me out.

The problem was that clicking the anchor still triggered a click in your <div>. That's called "event bubbling".
In fact, there are multiple solutions:
Checking in the DIV click event handler whether the actual target element was the anchor
→ jsFiddle
$('.expandable-panel-heading').click(function (evt) {
if (evt.target.tagName != "A") {
alert('123');
}
// Also possible if conditions:
// - evt.target.id != "ancherComplaint"
// - !$(evt.target).is("#ancherComplaint")
});
$("#ancherComplaint").click(function () {
alert($(this).attr("id"));
});
Stopping the event propagation from the anchor click listener
→ jsFiddle
$("#ancherComplaint").click(function (evt) {
evt.stopPropagation();
alert($(this).attr("id"));
});
As you may have noticed, I have removed the following selector part from my examples:
:not(#ancherComplaint)
This was unnecessary because there is no element with the class .expandable-panel-heading which also have #ancherComplaint as its ID.
I assume that you wanted to suppress the event for the anchor. That cannot work in that manner because both selectors (yours and mine) select the exact same DIV. The selector has no influence on the listener when it is called; it only sets the list of elements to which the listeners should be registered. Since this list is the same in both versions, there exists no difference.

Try this
$('.expandable-panel-heading:not(#ancherComplaint)').click(function () {
alert('123');
});
$('#ancherComplaint').click(function (event) {
alert($(this).attr("id"));
event.stopPropagation()
})
DEMO

Try following :
$('.expandable-panel-heading').click(function (e) {
if(e.target.nodeName == 'A'){
markActiveLink(e.target)
return;
}else{
alert('123');
}
});
function markActiveLink(el) {
alert($(el).attr("id"));
}
Here is the working demo : http://jsfiddle.net/JVrNc/4/

Change your jQuery code with this. It will alert the id of the a.
$('.expandable-panel-heading:not(#ancherComplaint)').click(function () {
markActiveLink();
alert('123');
});
function markActiveLink(el) {
var el = $('a').attr("id")
alert(el);
}
Demo

You need to read up on event bubbling and for sure remove inline event handling if you have jQuery anyway
Test the click on the div and examine the target
Live Demo
$(".expandable-panel-heading").on("click",function (e) {
if (e.target.id =="ancherComplaint") { // or test the tag
e.preventDefault(); // or e.stopPropagation()
markActiveLink(e.target);
}
else alert('123');
});
function markActiveLink(el) {
alert(el.id);
}

I would have used stopPropagation like this:
$('.expandable-panel-heading:not(#ancherComplaint)').click(function () {
alert('123');
});
$('#ancherComplaint').on('click',function(e){
e.stopPropagation();
alert('hiiiiiiiiii');
});

Try out this example, the onclick is still called from your HTML, and event bubbling is stopped.
<div class="expandable-panel-heading">
<h2>
<a id="ancherComplaint" href="#addComplaint" onclick="markActiveLink(this);event.stopPropagation();">ABC</a>
</h2>
</div>
http://jsfiddle.net/NXML7/1/

put your jquery function inside ready function for call click event:
$(document).ready(function() {
$("#ancherComplaint").click(function () {
alert($(this).attr("id"));
});
});

when click on div alert key
$(document).delegate(".searchbtn", "click", function() {
var key=$.trim($('#txtkey').val());
alert(key);
});

How do I bind to the click event from within the click event when I need to do it repeatedly?

I've got code so that when you click on a word, it is replaced by another word.
<script>
$(document).ready(function() {
$('.note_text').click(function(){
$(this).remove();
$('#note_div').append('<span class="note_text">new</span>');
// re-applying behaviour code here
});
});
</script>
<div id="note_div">
<span class="note_text">preparing</span>
</div>
I need the appended word to have the same click behaviour. What is the best way to do this?

change
$('.note_text').click(function(){
to
$('.note_text').live('click',function(){
This will cause anything on your page that ever gets the class 'note_text' to have the behaviour set by .live

You should use a .live()help or .delegate()help binding for that purpose.
$(function() {
$('#note_div').delegate('.note_text', 'click', function(e) {
$(e.target).parent().append("<span class='note_text'>new</span>").end().remove();
});
});
Demo: http://www.jsfiddle.net/PkngP/2/

You could rebind the handler:
function handler(){
$(this).remove();
$('#note_div').append("<span class="note_text">new</span>");
$(".note_text").unbind("click");
$('.note_text').click(handler);
}
$(document).ready(function() {
$('.note_text').click(handler);
});

jquery: get mouse click if inside a div or not

i have this HTML page
<html>
<body>
<div>a</div>
<div>b</div>
<div>c</div>
<div>d</div>
<div id='in_or_out'>e</div>
<div>f</div>
</body>
</html>
a,b,c,d,e and f could be divs also not just a plain text.
I want to get the mouse click event, but how could i know if it's inside or outside #in_or_out div ?
EDIT :: guys, i know how to check if the div is click or not, but i want my event to be fired when the click is outside that div

$("body > div").click(function() {
if ($(this).attr("id") == "in_or_out") {
// inside
} else {
// not inside
}
});
EDIT: just learned, that there is a negate:
$("body > div:not(#in_or_out)").click(function(e) {
// not inside
});

If you want to detect whether or not you've clicked inside or outside the div, set the event handler on the documentElement and let it propagate from the other elements upwards:
$("html").click(function (e)
{
if (e.target == document.getElementById("in_or_out"))
alert("In");
else
alert("Out!");
});

Maybe this one will help you
$('body').click(function(){
//do smth
});
$('div#in_or_out').click(function(e){
e.stopPropagation();
// do smth else
});

Depends what you want. If you only want to execute code, when it was inside #in_or_out, you can do:
$('#in_or_out').click(function(){ /* your code here */ });
You can have a status variable that says whether the mouse is in #in_or_out or not:
var inside = false;
$('#in_or_out').hover(function() { inside = true; }, function() { inside = false; });
Then whenever a click occurs you can check with inside whether the click was inside in_or_out or not.
Reference: .hover()
Update:
No matter to which element you bind the click handler, you can always do this:
$('element').click(function() {
if ($(this).attr('id') !== 'in_or_not') {
}
});

for inside it would be
$("#in_or_out").click(function() {
// do something here
});
for outside...I've got no idea.
Edit: You could try to do the same for body-tag (assigning a click-handler to the document itself). But I'm not sure if both events would fire by that.

Like this?
$("#in_or_out").click(function() {
alert("IN DIV!");
});