5. Open the Menu


#1

Hi Guys,

I'm pretty new at this but can't work out the problem. Here is my code:

var main = function() {
$('.icon-menu').click(function() {
$('.menu').animate({left: '0px'}, 200);
$('.body').animate({left: '+285px'}, 200);});
};
$(document).ready(main);

I keep getting this error: Oops, try again. Add code for $('body') inside $('.icon-menu').click(). Look back at the instructions for the code.

When I try it on the screen though it seems to work so i'm not sure what the issue is.

Any help is greatly appreciated ! :smile:


#2

@django_fettuccine,

A jQuery-Selector $("")
uses a specific syntax to select Elements in your HTML-Document.

  • if you want to select by HTML-Element-name, you use "body" or "p" or "li" or "div"
  • if you want to select a HTML-Element by their class-attribute you prepend the class-name with a dot, like .menu
    ( if you had a id-attribute you have used #id-name play around with http://www.w3schools.com/jquery/trysel.asp )

+++++ DOM representation of push menu

If your HTML-page is loaded into memory by the Browser
the memory-layout will be build
using the rules, as defined in the Document Object Model
in short the DOM

The DOM representation of the index.html file would look like:

               html
                |
         |------+---------|
         |                |
        head             body
         |                |
    |----+----|      |----+-----------|
    |    |    |      |                |
   link link link  10div(.menu)     27div(.jumbotron)
                    |                 |
     |--------------+----|          29div(.icon-menu)
     |                   |             |
   13div(.icon-close)  18ul          30i (.fa
     |                   |             |  and .fa-bars)
    img       |-----|----+|-----|    text  
              |     |     |     |    node
             19li  20li  21li  22li
              |     |     |     |
              a     a     a     a
              |     |     |     |
            text   text  text  text
            node   node  node  node

Now if you look at the DOM representation
the body-Tag is parent to
a 10div Element's Tree ( with class-attribute with class-name "menu" )
and
a 27div Element's Tree ( with class-attr. with class-name "jumbotron" set )

Now if you look in the style.css file,
with which you manage the Display of your Elements,
you will find that
the body object has the property left: 0; being set
( the body-Tree has a _start-Display at position left-0 )_

but
the .menu object has the property left: -285px; being set
and therefor the 10div-Tree is outside of Display.

In your 'app.js' file you are
CREATING a VARIABLE main
to which you assign a so-called anonymous Function
and in the FUNCTION-BODY of this anonymous Function
we are attaching our click Event-handlers
to the HTML-Elements which are
-1 carrying the "icon-menu" class-name as class-attribute
-2 carrying the "icon-close" class-name as class-attribute
( during the assignment the function is NOT executed )

You will have to add the code-line
$(document).ready( main );
which will result in the =main= Function to be executed
AFTER the Browser has set the ready Event-flag.

Reference::

google search
class site:jquery.com
https://api.jquery.com/category/selectors/
http://api.jquery.com/class-selector/
https://api.jquery.com/element-selector/
http://www.w3schools.com/jquery/jquery_ref_selectors.asp
http://www.w3schools.com/jquery/trysel.asp

what is CSS explained site:developer.mozilla.org
https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Getting_started/What_is_CSS
https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity

= http://stackoverflow.com/questions/1795438/load-and-execution-sequence-of-a-web-page


#3

Thanks, I found the error based on this. Cheers!