Because in `display:none`, the element, for all purposes, ceases to exist -- it doesn&#39;t occupy any space.
However, in `visibility:hidden`, it&#39;s as if you had just added `opacity:0` to the element -- it occupies the same amount of space but just acts invisible.

The jQuery creators probably thought the former would be a better fit for `.hide()`.

`visibility: hidden` makes an element invisible but does not remove it from the layout of the page. It leaves an empty box where the element was. `display: none` removes it from the layout so it doesn&#39;t take up any space on the page, which is usually what people want when they hide something.

Visibility:hidden makes the element invisible in a way that it still uses space at the page. Display:none makes the element have no space and be completely gone, while it still exists in the DOM.

Visibility just makes the element invisible, but it would still take up space on the screen.

`Visibility:hidden` just make the element invisible but it is loaded in DOM so it consumes load time. But `Display:none` does not load the element. 

&gt; **Possible Duplicate:**  
&gt; [What are the differences between various threading synchronization options in C#?](https://stackoverflow.com/questions/301160/what-are-the-differences-between-various-threading-synchronization-options-in-c)  

&lt;!-- End of automatically inserted text --&gt;

What is the difference between a Monitor and a Mutex in C#?

When to use a Monitor and when to use a Mutex in C#?


Monitor vs Mutex in c#

How does MySQL store a varchar field? Can I assume that the following pattern represents sensible storage sizes :

1,2,4,8,16,32,64,128,255 (max)




A clarification via example. Lets say I have a varchar field of 20 characters. Does MySQL when creating this field, basically reserve space for 32 bytes(not sure if they are bytes or not) but only allow 20 to be entered?

I guess I am worried about optimising disk space for a massive table. 

What are the optimum varchar sizes for MySQL?

`display:none` means that the element isn&#39;t rendered as part of the DOM, so it&#39;s not loaded until the display property changes to something else. 

`visibility:hidden` loads the element, but does not show it. 

Why does jQuery use `display:none` for its show/hide functions instead of switching between `visibility:hidden` and `visibility:visible`?

Why does jQuery show/hide use display:none instead of visibility:hidden?

<code>display:none</code> means that the element isn't rendered as part of the DOM, so it's not loaded until the display property changes to something else.
<code>visibility:hidden</code> loads the element, but does not show it.
Why does jQuery use <code>display:none</code> for its show/hide functions instead of switching between <code>visibility:hidden</code> and <code>visibility:visible</code>?

Given this function:

    function Repeater(template) {
    
        var repeater = {
    
            markup: template,
    
            replace: function(pattern, value) {
                this.markup = this.markup.replace(pattern, value);
            }
    
        };
    
        return repeater;
    
    };

How do I make `this.markup.replace()` replace globally? Here&#39;s the problem. If I use it like this:

    alert(new Repeater(&quot;$TEST_ONE $TEST_ONE&quot;).replace(&quot;$TEST_ONE&quot;, &quot;foobar&quot;).markup);

The alert&#39;s value is &quot;foobar $TEST_ONE&quot;.

If I change `Repeater` to the following, then nothing in replaced in Chrome:

    function Repeater(template) {
    
        var repeater = {
    
            markup: template,
    
            replace: function(pattern, value) {
                this.markup = this.markup.replace(new RegExp(pattern, &quot;gm&quot;), value);
            }
    
        };
    
        return repeater;
    
    };

...and the alert is `$TEST_ONE $TEST_ONE`.

JavaScript replace/regex

I have a web page which I have prevented the default action on all submit buttons, however I would like to re-enable default submit action on a button how can I do this?

I am currently preventing the default action using the following:

    $(&quot;form&quot;).bind(&quot;submit&quot;, function(e){
    e.preventDefault();
    });

I have successfully done this using the following: 

    $(document).ready(function(){
    $(&quot;form:not(&#39;#press&#39;)&quot;).bind(&quot;submit&quot;, function(e){
    e.preventDefault();
    });

But can I do this dynamically when the button is clicked?

How to reenable event.preventDefault?

I have a checkbox that I want to perform some Ajax action on the click event, however the checkbox is also inside a container with it&#39;s own click behaviour that I don&#39;t want to run when the checkbox is clicked. This sample illustrates what I want to do:

    

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-js --&gt;

    $(document).ready(function() {
      $(&#39;#container&#39;).addClass(&#39;hidden&#39;);
      $(&#39;#header&#39;).click(function() {
        if ($(&#39;#container&#39;).hasClass(&#39;hidden&#39;)) {
          $(&#39;#container&#39;).removeClass(&#39;hidden&#39;);
        } else {
          $(&#39;#container&#39;).addClass(&#39;hidden&#39;);
        }
      });
      $(&#39;#header input[type=checkbox]&#39;).click(function(event) {
        // Do something
      });
    });

&lt;!-- language: lang-css --&gt;

    #container.hidden #body {
      display: none;
    }

&lt;!-- language: lang-html --&gt;

    &lt;script type=&quot;text/javascript&quot; src=&quot;https://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js&quot;&gt;&lt;/script&gt;
    &lt;div id=&quot;container&quot;&gt;
      &lt;div id=&quot;header&quot;&gt;
        &lt;h1&gt;Title&lt;/h1&gt;
        &lt;input type=&quot;checkbox&quot; name=&quot;test&quot; /&gt;
      &lt;/div&gt;
      &lt;div id=&quot;body&quot;&gt;
        &lt;p&gt;Some content&lt;/p&gt;
      &lt;/div&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;

However, I can&#39;t figure out how to stop the event bubbling without causing the default click behaviour (checkbox becoming checked/unchecked) to not run.

Both of the following stop the event bubbling but also don&#39;t change the checkbox state:

    event.preventDefault();
    return false;

How to stop event bubbling on checkbox click

I don&#39;t seem to be able to capture two events at the same time. I am trying to capture the Shift and Click (mouse click) event. 

I have no problem capturing each action separately but not the two together.

Has anybody done some research on that particular problem?

Capture a Shift and Click event with jQuery

Here is my object literal:

    var obj = {key1: value1, key2: value2};

How can I add field `key3` with `value3` to the object?

How can I add a key/value pair to a JavaScript object?

How to enable or disable an anchor using jQuery? 

How to check if a user input text is all white space characters (space, tab, enter etc) in client side?

How to check if a text is all white space characters in client side?

I want to make an instance variable that can&#39;t be accessed from outside. Is something like that possible in objective-c? I remember Apple has private variables and stuff like that, but if people know about them, they can use them. Apple calls that &quot;private API&quot;, but obviously others can access that stuff if they find out what&#39;s in there.

Until now I believed that something like this creates a private instance variable:

    @interface MyClass : NSObject {
        CGFloat weight;
    }

No @property, no @synthesize, just the declaration above.

Also I know Apple adds a _inFrontOfTheirPrivateInstanceVariables, but they said somewhere that they don&#39;t like to see others doing that because they might override accidently hidden instance variables when doing that.

What&#39;s the trick here?

How to make a real private instance variable?

I&#39;m displaying a very big tree with a lot of items in it. Each of these items shows information to the user through its associated UserControl control, and this information has to be updated every 250 milliseconds, which can be a very expensive task since I&#39;m also using reflection to access to some of their values. My first approach was to use the IsVisible property, but it doesn&#39;t work as I expected.

Is there any way I could determine whether a control is &#39;visible&#39; to the user? 

Note: I&#39;m already using the IsExpanded property to skip updating collapsed nodes, but some nodes have 100+ elements and can&#39;t find a way to skip those which are outside the grid viewport.

In WPF, how can I determine whether a control is visible to the user?

is it possible to determine whether my `UIView` is visible to the user or not?

My View is added as `subview` several times into a `Tab Bar Controller`.

Each instance of this view has a `NSTimer` that updates the view.

However I don&#39;t want to update a view which is not visible to the user.

Is this possible?

Thanks

Determine if UIView is visible to the user?

I need to do a very simple thing - find out if the software keyboard is shown. Is this possible in Android?

How to check visibility of software keyboard in Android?

I have a shared library project that is built from 4 static libraries (`.a`) and one object (`.o`) file. I am trying to add the `-fvisibility=hidden` option to restrict symbols in the output to only those that I mark in the source with an \__attribute\__.

I&#39;ve added the `-fvisibility=hidden` option to the compile options for the `.so` project (which covers the `.o` file) and for the `.a` projects.

The symbols in the object file are removed as expected from the final `.so`. However the symbols from the `.a` projects are all still in the final `.so` file. Adding the `-fvisibility=hidden` option to the `.so` link command has no effect.

What am I doing wrong?

My purpose here is to remove from the `.so` all symbols except the interface functions to the library.

EDIT: I actually used a [version map][1] to solve this for now. However it requires continued maintenance of the version script as external symbols change. Accepted answer has a better idea.


  [1]: http://sourceware.org/ml/binutils/2000-05/msg00305.html

Content Type	Original Author	Original Content on Stackoverflow
Question	isayno	View Question on Stackoverflow
Solution 1 - Javascript	Salty	View Answer on Stackoverflow
Solution 2 - Javascript	John Kugelman	View Answer on Stackoverflow
Solution 3 - Javascript	user142019	View Answer on Stackoverflow
Solution 4 - Javascript	Seph	View Answer on Stackoverflow
Solution 5 - Javascript	anil kumar	View Answer on Stackoverflow

Why does jQuery show/hide use display:none instead of visibility:hidden?

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Solution 2 - Javascript

Solution 3 - Javascript

Solution 4 - Javascript

Solution 5 - Javascript

What are the optimum varchar sizes for MySQL?

Monitor vs Mutex in c#

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