cant change variable_问答_开发者_运维开发者技术经验分享

开发者 https://www.devze.com 2023-03-23 21:52 出处：网络

I\'m trying to make a navigation area and am trying to switch tabs with the active variable. This is just for the nav button, but later I\'d like to make a rotator too b开发者_如何学运维y switching th

I'm trying to make a navigation area and am trying to switch tabs with the active variable. This is just for the nav button, but later I'd like to make a rotator too b开发者_如何学运维y switching the variable.

Here is my code:

                active = 1;

        function hover() {


            $(nav1).live('mouseenter', function() {
                active = 2;
            });

            if ( active == 1) {
            $(tab1).fadeIn('fast');
            }
            else if ( active != 1) {
                $(tab1).fadeOut('slow');
            } 

            if ( active == 2) {
                $(tab2).fadeIn('fast');
            }
            else if ( active != 2) {
                $(tab2).fadeOut('slow');
            } 

        }


        hover();

You should try

active = 1;
function showTab() {
    if ( active == 1) {
        $(tab1).fadeIn('fast');
    }
    else if ( active != 1) {
        $(tab1).fadeOut('slow');
    } 

    if ( active == 2) {
        $(tab2).fadeIn('fast');
    }
    else if ( active != 2) {
        $(tab2).fadeOut('slow');
    }
}

$(nav1).live('hover', function() {
    active = 1;
    showTab();
});

$(nav2).live('hover', function() {
    active = 2;
    showTab();
});

Note that you need four vars tab1, tab2, nav1 and nav2 for this code.

Your tab selection "if ( active == 1) {..." is only called at the beginning. You'll need to call this switch loop again.

Because of your question if active equals 2 - obviously it does not. Do you mean

$(nav1).live('hover', function() {
   active += 1;
});

This increases active every time you hover $(nav1). By the way: Do you mean $('nav1')?

If I understand what you're trying to do, then you might think about setting the 'active' variable to the actual menu item instead of a number. Also, you might be using jQuery .live() incorrectly and in addition, jQuery .delegate() is probably more useful in this case depending on your markup. (see jquery.com for info on these methods)

<html>
<head>
<script type="text/javascript">

// the active nav item:
var active;

// set up the hover events on each nav item only after the DOM is ready:
$(document).ready(function() {

    $('.nav li').hover(function() {

        // set the active nav item:
        active = $(this);

        // show the active nav item in the UI as test
        alert(this.id);
    });

});

</script>
</head>
<body>

<ul class="nav">
    <li id="nav1">nav 1</li>
    <li id="nav2">nav 1</li>
</ul>

</body>
</html>

cant change variable

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