How to show/hide DOM element with jQuery?

Question

There are button (id= "hide_message_button") and message(id="message"). The click on the button should hide/show the message. The source code:

$('#hide_message_button').click(function(){
   var bool = $('#message').css('visibility','hidden').is(':hidden');
   if(bool){
      $('#message').show();
      $(this).val('Hide');
   }
   else {
      $('#message').hide();
      $(this).val('Show');
   }
});

I have a bug: the message is hidden with first click on the button and didn't shown again (but button's value is changed to 'Show'). What's wrong? Thanks.

i-CONICA · Accepted Answer · 2012-03-05 16:45:28Z

3

Try:

$('#hide_message_button').click(function(){
    $('#message').toggle();
});

answered Mar 5, 2012 at 16:45

i-CONICA

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Comments

karim79 · Accepted Answer · 2012-03-05 16:38:38Z

2

Elements with visibility: hidden style properties are not hidden, since they occupy space in layout. Try:

var bool = $('#message').is(":hidden");

or:

var bool = $('#message:hidden').length;

or:

var bool = $('#message').css("display") == "none";

From the manual:

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.

answered Mar 5, 2012 at 16:38

karim79

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1 Comment

tatiana_c Over a year ago

thanks! I tried all three options and all three ones work absolutely right. It is very interesting solution with "length".

Guffa · Accepted Answer · 2012-03-05 17:06:22Z

2

That's because the css('visibility','hidden') call is hiding the message, and then it's never shown again because the show method doesn't change the visibility style.

The element will then toggle between being hidden (display=block, visibility=hidden) and being removed (display=none, visibility=hidden). In one state the element takes up space, but the message is not shown in either state.

Just remove the code that sets the visibility style, and the code works.

Demo: http://jsfiddle.net/Guffa/JqE3Y/

edited Mar 5, 2012 at 17:06

answered Mar 5, 2012 at 16:38

Guffa

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3 Comments

tatiana_c Over a year ago

I think that the bool has also true value because the button's value changes with each click from "Show" to "Hide" and viceversa. I also tested it with alert message that I put in the "if" block.

Guffa Over a year ago

@tatiana_c: Yes, it does, actually. I already updated my answer with a more accurate description, and a corrected code.

tatiana_c Over a year ago

Thank you very much for the demo and the answer. It works and it's great.

user1242756 · Accepted Answer · 2012-03-05 16:42:31Z

1

Use toggle instead of verify visibility. This code works: http://jsfiddle.net/8qu9y/

answered Mar 5, 2012 at 16:42

user1242756

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Comments

talnicolas · Accepted Answer · 2012-03-05 16:57:41Z

0

Take a look at the toggle function.

<input type="button" id="hide_message_button" value="My button" />
<p id="message">A message</p>

and

$('#hide_message_button').click(function(){
   $('#message').toggle();
});

edited Mar 5, 2012 at 16:57

answered Mar 5, 2012 at 16:38

talnicolas

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2 Comments

talnicolas Over a year ago

I don't see why the button also disappear if you just toggled the #message id...

tatiana_c Over a year ago

Yes, you are right. I wrote before something different. This code works fine. Thanks.

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