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Detect position and hide a element

I'm trying to hide a button while a div have style positioned as 0.
The whole JS code to explain is:
$('#left-button').click(function() {
event.preventDefault();
$('#myTab').animate({
left: "+=200px"
}, "fast");
});
The code above WORKS. If I click on the button (left-button), the "mytab" div goes to the left. Now, I want to hide the #left-button, when the #myTab has style "left:0".
I tried this:
if ($('#myTab').css('left') == '0') {
$('#left-button').style.display = "none";
}
The basic style is
#myTab { width:300px; height:300px; position:relative; left:0; background:#777 }
#left-button {width:200px; height:200px; background:#ccc; }
There's no debug errors but nothing happens. What can I do?
If there's another method instead Js, let me know too.
Thank you very much.
http://jsfiddle.net/SgMDa/

You were just missing the unit value px
if ($('#myTab').css('left') == '0px') {
$('#left-button').hide();
}
And use .hide() instead style.display = "none";
Working Fiddle

The main problem in your code is with the line $('#left-button').style.display = "none"; and you have missed 'px' in the if condition if ($('#myTab').css('left') == '0') {
The if should be if ($('#myTab').css('left') == '0px') {
$ object returns jQuery wrapped array / object, what you are trying to access is the actual DOM element, so you have two options to access DOM element:
1. Using jQuery method hide()
$('#left-button').hide();
or
2. Using DOM property display
$('#left-button')[0].style.display = "none";
NOTE:
The jQuery Object: The Wrapped Set: Selectors return a jQuery object
known as the "wrapped set," which is an array-like structure that
contains all the selected DOM elements. You can iterate over the
wrapped set like an array or access individual elements via the
indexer ($(sel)[0] for example). More importantly, you can also apply
jQuery functions against all the selected elements.
Official information about jQuery Object

I think it is like you are getting value from left, try using the offset function
if ($('#myTab').offset().left == 0) {
$('#left-button').hide();
}

.css gives you measurement in px so you should try :
if ($('#myTab').css('left') == '0px') {
$('#left-button').style.display = "none";
}

Check if div only contains inline elements

I am trying to run a function that executes if a div only contains inline elements
I am not sure how to go about this short of having to list out every single block element and checking that the div doesn't contain that.
$(this).children().each(function(){
if(this.nodeName.toLowerCase() == 'p' || this.nodeName.toLowerCase() == 'h1' etc...){
check = true; //it contains block element so it is not only inline elements
return false;
}
});
Is there a better way?
Edit
To help clarify, I have a content editable div and the problem is that the user can delete all the block elements out of the div. I need to check this and add a block element to the div.

Check to see if those elements are actually block-level, as CSS can change their behavior completely:
var has_inline = $('#parent').children().filter(function() {
return $(this).css('display') !== 'block';
}).length > 0;
I'm not sure what you consider inline-block to be, so I'll just assume it behaves like an inline element for your purposes.
Demo: http://jsfiddle.net/hXckq/2/

How about has() in jQuery:
if ($(this).has("p,h1, ...")) { ... }

You could put the inline elements into a hash, then use in or hasOwnProperty:
var inline = {
"span": true,
"a": true,
...
};
if(this.nodeName.toLowerCase() in inline) {
}

Maybe try this, check if the css property of each element is indeed inline, this should work though I did not test this syntax may be incorrect:
$(this).children().each(function(){
if($(this).css('display', 'inline') == true){
return true;
}else{
return false;
}
}

Find first element in div that has margin? (purpose: remove margin)

I need to find the first (and last) element in a div that has a CSS margin set (> 0 px). (important: this is not necessarily the first or last element!)
Basically, I need to do this so that I can remove the margin-top for the first element and the margin-bottom for the last. Now I know you'll probably say "why not use "p:last" CSS syntax?"
Because the first or last element can be something else as well, it could be a list (UL, OL), an image, a paragraph, etc.. I cannot simply do, ul:last, ol:last, p:last as that could result in multiple elements being matched (one per type).
I only want to apply this to a single element. So that's why I think jquery is the only solution. I would gladly be wrong on this though.

Since you want only the first/last child with a margin, I imagine you'll need to use jQuery/JavaScript:
var isfirst = 1, lastelm;
$("#divid").find("*").each(function() {
var cur = $(this);
if(parseInt(cur.css("margin-top")) > 0 && isfirst == 1) {
cur.css("margin-top", 0);
isfirst = 0;
}
if(parseInt(cur.css("margin-bottom")) > 0) {
lastelm = cur;
}
});
lastelm.css("margin-bottom", 0);

I would suggest the filter method in jquery(http://api.jquery.com/filter/).
Here is a sample i could think of
<html>
<body>
<p>
<p>A<p>
<p>B<p>
<p style="margin: 10px;">C<p>
<p style="margin: 10px;">C<p>
<p>D<p>
</p>
<script>
$(document).ready(function(){
$('p').filter(function(){
return this.style.margin != '';
}).last().css('color','red');
});
</script>
<body>
​
You might want to build upon the filter logic...

:last isn't actually a CSS selector outside of jQuery. But what you could use is :first-child as well as :last-child:
#my-element > *:first-child {
margin-top: 0;
}
#my-element > *:last-child {
margin-bottom: 0;
}
Edit: Too late. However I'd definitely use the > selector so as not to style every first child in #my-element (like the first li in a ul or a strong inside a p etc).

A question about a standard way to hide a div in Javascript and jQuery

I'm still relatively new to javascript and jQuery and was just wondering this.
Suppose I have this HTML snippet:
<p id="disclaimer">
Disclaimer! </p>
<input type="button" id="hideButton" value="hide" />
I could hide the div in the following ways:
$(document).ready(function() {
$('#hideButton').click(function() {
if ($('#disclaimer').css('display') == 'none') {
$('#disclaimer').show();
$('#hideButton').val('hide');
} else {
$('#disclaimer').hide();
$('#hideButton').val('unhide');
}
})
});
OR
$(document).ready(function() {
$('#hideButton').click(function() {
if ($('#disclaimer').is(':visible')) {
$('#disclaimer').hide();
$('#hideButton').val('unhide');
} else {
$('#disclaimer').show();
$('#hideButton').val('hide');
}
})
});
My question is: Is there a preferred method of hiding the div or is it just a matter of personal preference?

i'd write that like this
$(function() {
$('#hideButton').click(function() {
$('#disclaimer').toggle();
$(this).val(
$('#disclaimer').is(":visible") ?
'hide' : 'unhide'
);
})
})
or even
$(function() {
$('#hideButton').click(function() {
$(this).val(
$('#disclaimer').toggle().is(":visible") ?
'hide' : 'unhide'
)
})
})
in response to the comment, here some points why i think this code is better
$(...) looks nicer than document.ready
toggle() without a param is better than "if is visible then hide else show" - don't ask, tell.
always use $(this) to refer to the object itself in an event handler
use chaining when it doesn't hurt readability

Yes, you could use the .toggle(showOrHide) variant:
$(document).ready(function() {
$('#hideButton').click(function() {
var $disclaimer = $('#disclaimer'),
isVisible = $disclaimer.is(':visible');
$disclaimer.toggle(!isVisible);
$('#hideButton').val(isVisible ? 'unhide' : 'hide');
});
});

There is no point in querying the element's style to find out if it's visible; you can retain its state programmatically:
var isVisible = true,
disclaimer = $('#disclaimer'),
hideButton = $('#hideButton');
hideButton.click(function(){
disclaimer[isVisible ? 'hide' : 'show']();
hideButton.val(isVisible ? 'unhide' : 'hide');
isVisible = !isVisible;
});

I would do the actual hiding exactly like user187291 wrote.
But for your questions, I would suggest using the ":visible" selector since there are more ways to hide an element other than changing its display css attribute.
From the jQuery specification:
Elements can be considered hidden for several reasons:
* They have a CSS display value of none.
* They are form elements with type="hidden".
* Their width and height are explicitly set to 0.
* An ancestor element is hidden, so the element is not shown on
the page.
A certain animation may reach the state of having the width and height set explicitly to 0 and not change the display attribute.

How to disable all div content

I was under the assumption that if I disabled a div, all content got disabled too.
However, the content is grayed but I can still interact with it.
Is there a way to do that? (disable a div and get all content disabled also)

Many of the above answers only work on form elements. A simple way to disable any DIV including its contents is to just disable mouse interaction. For example:
$("#mydiv").addClass("disabledbutton");
CSS
.disabledbutton {
pointer-events: none;
opacity: 0.4;
}
Supplement:
Many commented like these: "This will only disallow mouse events, but the control is still enabled" and "you can still navigate by keyboard". You Could add this code to your script and inputs can't be reached in other ways like keyboard tab. You could change this code to fit your needs.
$([Parent Container]).find('input').each(function () {
$(this).attr('disabled', 'disabled');
});

Use a framework like JQuery to do things like:
function toggleStatus() {
if ($('#toggleElement').is(':checked')) {
$('#idOfTheDIV :input').attr('disabled', true);
} else {
$('#idOfTheDIV :input').removeAttr('disabled');
}
}
Disable And Enable Input Elements In A Div Block Using jQuery should help you!
As of jQuery 1.6, you should use .prop instead of .attr for disabling.

Here is a quick comment for people who don't need a div but just a blockelement. In HTML5 <fieldset disabled="disabled"></fieldset> got the disabled attribute. Every form element in a disabled fieldset is disabled.

I just wanted to mention this extension method for enabling and disabling elements. I think it's a much cleaner way than adding and removing attributes directly.
Then you simply do:
$("div *").disable();

You can use this simple CSS statement to disable events
#my-div {
pointer-events:none;
}

The disabled attribute is not part of the W3C spec for DIV elements, only for form elements.
The jQuery approach suggested by Martin is the only foolproof way you're going to accomplish this.

Wrap the div within the form and fieldset tags:
<form>
<fieldset disabled>
<div>your controls</div>
</fieldset>
</form>

similar to cletu's solution, but i got an error using that solution, this is the workaround:
$('div *').prop('disabled',true);
// or
$('#the_div_id *').prop('disabled',true);
works fine on me

If you wanted to keep the semantics of disabled as follows
<div disabled="disabled"> Your content here </div>
you could add the following CSS
div[disabled=disabled] {
pointer-events: none;
opacity: 0.4;
}
the benefit here is that you're not working with classes on the div that you want to work with

One way to achieve this is by adding the disabled prop to all children of the div. You can achieve this very easily:
$("#myDiv").find("*").prop('disabled', true);
$("#myDiv") finds the div, .find("*") gets you all child nodes in all levels and .prop('disabled', true) disables each one.
This way all content is disabled and you can't click them, tab to them, scroll them, etc. Also, you don't need to add any css classes.

As many answers already clarified disabled is not a DIV attribute. However xHTML means Extensible HTML. It means you can define your own HTML attributes (all Frontend frameworks does that as well). And CSS supports attribute selectors which is [].
Use standard HTML with your defined attribute:
<div disabled>My disabled div</div>
Use CSS:
div[disabled] {
opacity: 0.6;
pointer-events: none;
}
NOTE: you can use CSS attribute selector with ID or Class names as well e.g. .myDiv[disabled] {...} Also can apply value filter e.g.: following HTML disabling standard attribute with value div[disabled=disabled] {...}.

Browsers tested: IE 9, Chrome, Firefox and jquery-1.7.1.min.js
$(document).ready(function () {
$('#chkDisableEnableElements').change(function () {
if ($('#chkDisableEnableElements').is(':checked')) {
enableElements($('#divDifferentElements').children());
}
else {
disableElements($('#divDifferentElements').children());
}
});
});
function disableElements(el) {
for (var i = 0; i < el.length; i++) {
el[i].disabled = true;
disableElements(el[i].children);
}
}
function enableElements(el) {
for (var i = 0; i < el.length; i++) {
el[i].disabled = false;
enableElements(el[i].children);
}
}

HTML input controls can be disabled using 'disabled' attribute as you know. Once 'disabled' attribute for an input control is set, event handlers associated with such control are not invoked.
You have to simulate above behavior for HTML elements that don't support 'disabled' attribute like div, if you wish.
If you have a div, and you want to support click or a key event on that div, then you have to do two things:
1) When you want to disable the div, set its disabled attribute as usual (just to comply with the convention)
2) In your div's click and/or key handlers, check if disabled attribute is set on the div. If it is, then just disregard the click or key event (e.g. just return immediately). If disabled attribute is not set, then do your div's click and/or key event logic.
Above steps are browser independent as well.

How to disable the contents of a <div/>
The CSS pointer-events property alone doesn't disable child elements from scrolling, and it's not supported by IE10 and under for <div/> elements (only for SVG).
http://caniuse.com/#feat=pointer-events
To disable the contents of a <div/> on all browsers.
Jquery:
$("#myDiv")
.addClass("disable")
.click(function () {
return false;
});
CSS:
.disable {
opacity: 0.4;
}
/* Disable scrolling on child elements */
.disable div,
.disable textarea {
overflow: hidden;
}
To disable the contents of a <div/> on all browsers, except IE10 and under.
Jquery:
$("#myDiv").addClass("disable");
CSS:
.disable {
/* Note: pointer-events not supported by IE10 and under */
pointer-events: none;
opacity: 0.4;
}
/* Disable scrolling on child elements */
.disable div,
.disable textarea {
overflow: hidden;
}

This is for the searchers,
The best I did is,
$('#myDiv *').attr("disabled", true);
$('#myDiv *').fadeTo('slow', .6);

As mentioned in comments, you are still able to access element by navigating between elements by using tab key. so I recommend this :
$("#mydiv")
.css({"pointer-events" : "none" , "opacity" : "0.4"})
.attr("tabindex" , "-1");

Or just use css and a "disabled" class.
Note: don't use the disabled attribute.
No need to mess with jQuery on/off.
This is much easier and works cross browser:
.disabled{
position: relative;
}
.disabled:after{
content: "";
position: absolute;
width: 100%;
height: inherit;
background-color: rgba(0,0,0,0.1);
top: 0;
left: 0;
right: 0;
bottom: 0;
}
Then you can shut it on and off when initializing your page, or toggling a button
if(myDiv !== "can be edited"){
$('div').removeClass('disabled');
} else{
$('div').addClass('disabled');
}

I thought I'd chip in a couple of notes.
< div > can be disabled in IE8/9. I assume this is "incorrect", and it threw me off
Don't use .removeProp(), as it has a permanent effect on the element. Use .prop("disabled", false) instead
$("#myDiv").filter("input,textarea,select,button").prop("disabled", true) is more explicit and will catch some form elements you would miss with :input

I would use an improved version of Cletus' function:
$.fn.disable = function() {
return this.each(function() {
if (typeof this.disabled != "undefined") {
$(this).data('jquery.disabled', this.disabled);
this.disabled = true;
}
});
};
$.fn.enable = function() {
return this.each(function() {
if (typeof this.disabled != "undefined") {
this.disabled = $(this).data('jquery.disabled');
}
});
};
Which stores the original 'disabled' property of the element.
$('#myDiv *').disable();

Below is a more comprehensive solution to masking divs enabling
no separate CSS
cover the whole page or just an element
specify mask color and opacity
specify Z-index so you can show popups over the mask
show an hourglass cursor over the mask
removing the masking div on maksOff so a different one can be shown later
stretch mask when element resize
return the mask element so you can style it etc
Also included is hourglassOn and hourglassOff which can be used separately
// elemOrId - jquery element or element id, defaults to $('<body>')'
// settings.color defaults to 'transparent'
// settings.opacity defaults to 1
// settings.zIndex defaults to 2147483647
// if settings.hourglasss==true change cursor to hourglass over mask
function maskOn(elemOrId, settings) {
var elem=elemFromParam(elemOrId);
if (!elem) return;
var maskDiv=elem.data('maskDiv');
if (!maskDiv) {
maskDiv=$('<div style="position:fixed;display:inline"></div>');
$('body').append(maskDiv);
elem.data('maskDiv', maskDiv);
}
if (typeof settings==='undefined' || settings===null) settings={};
if (typeof settings.color==='undefined' || settings.color===null) settings.color='transparent';
if (typeof settings.opacity==='undefined' || settings.opacity===null) settings.opacity=1;
if (typeof settings.zIndex==='undefined' || settings.zIndex===null) settings.zIndex=2147483647;
if (typeof settings.hourglass==='undefined' || settings.hourglass===null) settings.hourglass=false;
// stretch maskdiv over elem
var offsetParent = elem.offsetParent();
var widthPercents=elem.outerWidth()*100/offsetParent.outerWidth()+'%';
var heightPercents=elem.outerHeight()*100/offsetParent.outerHeight()+'%';
maskDiv.width(widthPercents);
maskDiv.height(heightPercents);
maskDiv.offset($(elem).offset());
// set styles
maskDiv[0].style.backgroundColor = settings.color;
maskDiv[0].style.opacity = settings.opacity;
maskDiv[0].style.zIndex = settings.zIndex;
if (settings.hourglass) hourglassOn(maskDiv);
return maskDiv;
}
// elemOrId - jquery element or element id, defaults to $('<body>')'
function maskOff(elemOrId) {
var elem=elemFromParam(elemOrId);
if (!elem) return;
var maskDiv=elem.data('maskDiv');
if (!maskDiv) {
console.log('maskOff no mask !');
return;
}
elem.removeData('maskDiv');
maskDiv.remove();
}
// elemOrId - jquery element or element id, defaults to $('<body>')'
// if decendents is true also shows hourglass over decendents of elemOrId, defaults to true
function hourglassOn(elemOrId, decendents) {
var elem=elemFromParam(elemOrId);
if (!elem) return;
if (typeof decendents==='undefined' || decendents===null) decendents=true;
if ($('style:contains("hourGlass")').length < 1) $('<style>').text('.hourGlass { cursor: wait !important; }').appendTo('head');
if ($('style:contains("hourGlassWithDecendents")').length < 1) $('<style>').text('.hourGlassWithDecendents, .hourGlassWithDecendents * { cursor: wait !important; }').appendTo('head');
elem.addClass(decendents ? 'hourGlassWithDecendents' : 'hourGlass');
}
// elemOrId - jquery element or element id, defaults to $('<body>')'
function hourglassOff(elemOrId) {
var elem=elemFromParam(elemOrId);
if (!elem) return;
elem.removeClass('hourGlass');
elem.removeClass('hourGlassWithDecendents');
}
function elemFromParam(elemOrId) {
var elem;
if (typeof elemOrId==='undefined' || elemOrId===null)
elem=$('body');
else if (typeof elemOrId === 'string' || elemOrId instanceof String)
elem=$('#'+elemOrId);
else
elem=$(elemOrId);
if (!elem || elem.length===0) {
console.log('elemFromParam no element !');
return null;
}
return elem;
}
With this you can do for example:
maskOn(); // transparent page mask
maskOn(null, {color:'gray', opacity:0.8}); // gray page mask with opacity
maskOff(); // remove page mask
maskOn(div); // transparent div mask
maskOn(divId, {color:'gray', hourglass:true}); // gray div mask with hourglass
maskOff(div); // remove div mask
see jsfiddle

function disableItems(divSelector){
var disableInputs = $(divSelector).find(":input").not("[disabled]");
disableInputs.attr("data-reenable", true);
disableInputs.attr("disabled", true);
}
function reEnableItems(divSelector){
var reenableInputs = $(divSelector).find("[data-reenable]");
reenableInputs.removeAttr("disabled");
reenableInputs.removeAttr("data-reenable");
}

Another way, in jQuery, would be to get the inner height, inner width and positioning of the containing DIV, and simply overlay another DIV, transparent, over the top the same size. This will work on all elements inside that container, instead of only the inputs.
Remember though, with JS disabled, you'll still be able to use the DIVs inputs/content. The same goes with the above answers too.

$("#yourdivid textarea, #yourdivid input, #yourdivid select").attr('disabled',true);

This css only/noscript solution adds an overlay above a fieldset (or a div or any other element), preventing interaction:
fieldset { position: relative; }
fieldset[disabled]::after { content: ''; display: inline-block; position: absolute; top: 0; left: 0; right: 0; bottom: 0; pointer-events: all; background: rgba(128,128,128,0.2); }
If you want an invisible i.e. transparent overlay, set the background to e.g. rgba(128,128,128,0), as it won't work without a background.
The above works for IE9+. The following much simpler css will work on IE11+
[disabled] { pointer-events: none; }
Chrome

If you are simply trying to stop people clicking and are not horrifically worried about security - I have found an absolute placed div with a z-index of 99999 sorts it fine. You can't click or access any of the content because the div is placed over it. Might be a bit simpler and is a CSS only solution until you need to remove it.

Its very easy to handle if you want to disable the pointer event
document.getElementById("appliedDatepicker").style.pointerEvents = "none";
or
if you want to enable,
document.getElementById("appliedDatepicker").style.pointerEvents = "auto";

EDIT:
Below I've used .on() method, instead use .bind() method
$(this).bind('click', false);
$(this).bind('contextmenu', false);
to remove your setting, you can use .unbind() method. Whereas the .off() method doesn't work as expected.
$(this).unbind('click', false);
$(this).unbind('contextmenu', false);
After researching hundreds of solutions! learning about pointer-events, below is what I did.
As #Kokodoko mentioned in his solution which is apt for all browsers except IE. pointer-events work in IE11 and not in the lower versions. I also noticed in IE11, pointer-events do not work on the child elements. And hence if we have something like below
<i class="car icon"></i><span>My Blog</span>
where span -is the child element, setting pointer-events: nonewont work
To overcome this problem I wrote a function which could act as pointer-events for IE and will work in the lower versions.
In JS File
DisablePointerEvents(".DisablePointerEvents");
function DisablePointerEvents(classId) {
$(classId).each(function () {
$(this).on('click', false );
$(this).on('contextmenu', false );
});
}
In CSS File
.DisablePointerEvents{
pointer-events: none;
opacity: 0.7;
cursor: default;
}
In HTML
<i class="car icon"></i><span>My Blog</span>
This faked the pointer-events scenario where pointer-events doesnt work and when the above condition of child elements occur.
JS Fiddle for the same
https://jsfiddle.net/rpxxrjxh/

the simpleset solution
look at my selector
$myForm.find('#fieldsetUserInfo input:disabled').prop("disabled", false);
the fieldsetUserInfo is div contains all inputs I want to disabled or Enable
hope this helps you

There are configurable javascript libraries that take in a html string or dom element and strip out undesired tags and attributes. These are known as html sanitizers. For example:
DOMPurify
Insane
sanitize-html
E.g. In DOMPurify
DOMPurify.sanitize('<div>abc<iframe//src=jAva&Tab;script:alert(3)>def</div>');
// becomes <div>abcdef</div>