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Script, input with addClass and link.attr

so I'm trying to wrap my head around this script.
I'm not the best with JavaScript and jQuery yet, but I'm trying to learn.
<script>
var link = $("#to-toggle");
$("#toggle").on("change", function() {
if (this.checked) {
.addClass("active");
link.attr("href", link.data("href"));
} else {
.removeClass("active");
link.removeAttr("href");
}
});
</script>
Before I added the .addClass and .removeClass it worked fine, but I can't seem to be able to get a class to toggle as well, when my check box is checked/unchecked.
Any help is greatly appreciated.

You forgot where to add and remove the class to/from ---> link:
if(this.checked) {
link.addClass("active");
link.attr("href", link.data("href"));
} else {
link.removeClass("active");
link.removeAttr("href");
}
});

Assuming #toggle to be your checbox Id and you are trying to add and remove class to this checbox, replace your line
.addClass("active");
By
$(this).addClass("active");
Similarly replace
.removeClass("active");
By
$(this).removeClass("active");
I am on mobile, excuse me for format issues.

if(this.checked) {
$(this).addClass("active");
link.attr("href", link.data("href"));
} else {
$(this).removeClass("active");
link.removeAttr("href");
}
});

jQuery hide and show text input

I want to do a simple function in Jquery: when a button is clicked show the input text, when it's clicked again- hide the input text.
<div>
<div id="btnNewGroup">New Group</div>
<input type="text" id="newGroup" style="display:none" />
</div>
and this is the scrupt section:
$(document).ready(function () {
$("#btnNewGroup").click(function () {
if ($("#newGroup").hide()) {
$("#newGroup").show();
}
else {
$("#newGroup").hide()
}
});
});
when I click the button the text input is showing, when I click it again I want the input text to be hidden, but nothing happens.

You can use toggle() to show / hide
Live Demo
$("#btnNewGroup").click(function () {
$("#newGroup").toggle();
});
The problem with the condition you have is that you are hiding the element instead of checking if it is hidden. You can is with :hidden like is(':hidden') to check if element is hidden.
if ($("#newGroup").is(':hidden')) {
$("#newGroup").show();
else
$("#newGroup").hide();

if ($("#newGroup").hide())
The hide function does not return a boolean value so you can't use it in an if statement. It returns a jQuery object which is always true so your second block never gets hit.
You can try two things:
$(document).ready(function () {
$("#btnNewGroup").click(function () {
if ($("#newGroup").is(":visible")) {
$("#newGroup").hide();
}
else {
$("#newGroup").show()
}
});
});
Or a simple toggle:
$(document).ready(function () {
$("#btnNewGroup").click(function () {
$("#newGroup").toggle();
});
});
Additionally, when working with selectors multiple times it's a good idea to cache the element - otherwise jQuery tries to find the element each time you try:
$(document).ready(function () {
$("#btnNewGroup").click(function () {
var $newGroup = $("#newGroup"); // Cache it here
if ($newGroup.is(":visible")) {
$newGroup.hide();
}
else {
$newGroup.show()
}
});
});

use .toggle() for hide and show alternatively in jquery
$("#btnNewGroup").click(function () {
$("#newGroup").toggle();
});

Demo
Use .toggle() function
$("#btnNewGroup").click(function () {
$("#newGroup").toggle()
});
Or use :visible pseudo selector with is()
Demo
$(document).ready(function () {
$("#btnNewGroup").click(function () {
if ($("#newGroup").is(":visible")) {
$("#newGroup").hide();
}
else {
$("#newGroup").show()
}
});
});
Note :hide() function does not return boolean value. Use is(:visible) or is(:hidden)

You need to change
if ($("#newGroup").hide()) {
to (just one possible solution)
if ($("#newGroup").css('display')=='none') {
Because $("#newGroup").hide() will always return true.
And here are the full code:
$(document).ready(function () {
$("#btnNewGroup").click(function () {
if ($("#newGroup").css('display')=='none') {
$("#newGroup").show();
}
else {
$("#newGroup").hide()
}
});
});

Have a look at the .toggle() function within the API.
http://api.jquery.com/toggle/

document.getElementById("username").style.display='block';

How do I hide a element using jquery on click and when a user clicks away?

CODE:
<script type="text/javascript">
$(document).ready(function() {
$('.show_or_hide_link_clicker').click(function() {
$(".the_box_to_show").fadeIn(400);
});
});
</script>
When show_or_hide_link_clicker is clicked the_box_to_show is shown. How do I hide it if show_or_hide_link_clicker is clicked again or when the user clicks away?
Update: This is what I am doing now: http://jsfiddle.net/nFbnr/
Question: How can i remove the double click requirement ot show the div?

jQuery Toggle is what you're looking for.
$('.the_box_to_show').toggle();

When clicking anywhere, check if the element was on the propagation path. If not, the user clicked outside of it so you can hide it.
$(document).click(function(e) {
if ($(e.target).closest(".the_box_to_show").size() === 0) {
$(".the_box_to_show").hide();
}
});
http://jsfiddle.net/vdHAu/

$(document).click(function(e) {
if (!$(e.target).is(".the_box_to_show")) {
$(".the_box_to_show").hide();
}
});
$('.show_or_hide_link_clicker').click(function() {
$(this).hide();
$(".the_box_to_show").fadeIn(400);
});

An another way without delegate event to document level:
you have to set attribute tabindex to the box and CSS outline for style
http://jsfiddle.net/GV56b/
$(document).ready(function () {
$('.show_or_hide_link_clicker').click(function () {
$(this).hide();
$(".the_box_to_show").fadeIn(400, function () {
this.focus()
});
});
$(".the_box_to_show").on('blur',function(){
$(this).hide();
$('.show_or_hide_link_clicker').fadeIn(400);
});
});

check this out
$('.show_or_hide_link_clicker').click(function() {
$(this).hide();
$(this).addClass('active);
$(".the_box_to_show").fadeIn(400);
});
$(document).on('click', 'html', function(){
$(".the_box_to_show").fadeOut(400);
});
$(document).on('click', '.active', function(e){
e.stopPropagation();
});

Link style with javascript

I have this code for hiding\showing link depends on state of cBoxoverlay. But when i click to close this item(display:none), and then click again to show it(display:block) my link(#close-news) still not showing.
jQuery(document).click(function () {
if (jQuery("#cBoxOverlay").css("display", "none")) {
jQuery("#close-news").css("display", "none");
} else if (jQuery("#cBoxOverlay").css("display", "block")) {
jQuery("#close-news").css("display", "block");
Where did i make mistake?

try this - no need for if statements. You can just set the #close-news to whatever #cBoxOverLay is
$(document).click(function () {
$("#close-news").css("display", $("#cBoxOverlay").css('display'));
}

Use classes, does a cleaner job.
In case you don't want to use classes, try to use jQuery's toggle, which does basically exactly what you try to achieve: http://api.jquery.com/toggle/

Use is(":visible") to check if the element is visible, and then either show or hide...
jQuery(document).click(function () {
if (jQuery("#cBoxOverlay").is(":visible")) {
jQuery("#close-news").hide();
} else {
jQuery("#close-news").show();
}
});

You can try:
if ($("#cBoxOverlay").css("display") == "none") {
// ...
}
however you can use is method:
if ( $("#cBoxOverlay").is(':hidden')) {
// ...
}
$(document).click(function(){
if ($("#cBoxOverlay").is(":hidden")) { // if #cBoxOverlay is hidden
$("#close-news").hide() // hide the #close-news
} else if ($("#cBoxOverlay").is(":visible")) { // if #cBoxOverlay is visible
$("#close-news").show() // // show the #close-news
}
})
you can remove the the second condition and use else instead as when element is not hidden it is visible, of course.

Try this, based on #Raminson's answer:
$(document).click(function () {
if ($("#cBoxOverlay").is(':hidden')) {
$("#close-news").css("display", "none");
} else{
$("#close-news").css("display", "block");
May be give a try on this one, too:
$(document).click(function(){
$('#close-news').css('display', function(){return $('#cBoxOverlay').css('display');});
});

On-click adding and removing background color of a table data(td)

i am using jquery for set background color to the table data and its working fine but i need when user again click the td the color should be deselect. its my script for add color.
java script:
jQuery('td').click(function () { $(this).addClass('active'); });
my css class:
.active{background-color:red;}
when user again click the td the class should remove. How to achieve this.

jQuery('td').click(function () { $(this).toggleClass('active'); });
toggleClass adds if it doesn't exist or removes if it does exist.

You can use
$(this).removeClass('active');
although you would need to do a check to see if it is already active, which would make your code look like this:
jQuery('td').click(function () {
if($(this).hasClass('active') {
$(this).removeClass('active');
} else {
$(this).addClass('active');
}
});
EDIT:
#Justice is more correct:
jQuery('td').click(function () { $(this).toggleClass('active'); });