JQuery floating navigation menu (shopping website product type), jquery navigation menu

Source: Internet
Author: User

JQuery floating navigation menu (shopping website product type), jquery navigation menu

The content of a single page is large, and the page length is large, so it is convenient to quickly locate the page in different locations. As a result, floating menus are becoming popular, such as men's wear, women's wear, and beauty.

This menu function is divided into two parts:

1. Click the menu item and scroll the webpage to the corresponding position, which can be implemented simply by the anchor;

2. When scrolling the page, the selected menu item status should change accordingly. This requires listening to the page rolling events and performing some calculations;

Calculate the relationship between scrollTop and offsetTop of each div, determine where the current webpage is displayed, and add a style to the corresponding menu item based on the calculation result. For example, the offset () of the second div (). top = 300, the offset () of the third div (). top = 600, scrollTop = 400 at this time, indicating that most of the displayed position is the second div, and 700 is the third div. The following is a simple example:

 

<Div id = "menu"> <ul> <li> <a href = "# item1" class = "current"> 1F men's wear </a> </li> <li> <a href = "# item2"> 2F women's clothing </a> </li> <a href = "# item3"> 3F makeup </a> </ li> <a href = "# item4"> 4F digital </a> </li> <a href = "# item5"> 5F maternal and child </ a> </li> </ul> </div> <div id = "content"> 

 

     * {margin: 0;padding: 0;}        body {font-size: 12px;line-height: 1.7;}        li {list-style: none;}        #content {width: 800px;margin: 0 auto;padding: 20px;}        #content h1 {color: #0088bb;}        #content .item {padding: 20px;margin-bottom: 20px;border: 1px dotted #0088bb;}        #content .item h2 {font-size: 16px;font-weight: bold;border-bottom: 2px solid #0088bb;margin-bottom: 10px;}        #content .item li {display: inline;margin-right: 10px;}        #content .item li a img {width: 230px;height: 230px;border: none;}        #menu{position:fixed;left:50%;margin-left:400px;top:100px;}        #menu ul li a {            display: block;            margin: 5px 0;            font-size: 14px;            font-weight: bold;            color: #333;            width: 80px;            height: 50px;            line-height: 50px;            text-decoration: none;            text-align: center;        }        #menu ul li a:hover,#menu ul li a.current {color: #fff;background: #0088bb;} 
$ (Function () {$ (window ). scroll (function () {var scrollTop = $ (document ). scrollTop (); var contentItems =$ ("# content "). find (". item "); var currentItem =" "; contentItems. each (function () {var contentItem = $ (this); var offsetTop = contentItem. offset (). top; if (scrollTop> offsetTop-200) {// here 200 is set based on the actual situation, because if you do not subtract a value, just scroll to the edge of a div, an error occurs when the menu is selected. For example, when the page just scrolls to the bottom of the first div, the second div is displayed on the page, and the first option in the menu is in the selected curren status. TItem = "#" + contentItem. attr ("id") ;}}); if (currentItem & currentItem! = $ ("# Menu "). find (". current "). attr ("href") {$ ("# menu "). find (". current "). removeClass ("current"); $ ("# menu "). find ("[href =" + currentItem + "]"). addClass ("current ");}});});

 


When I click in the navigation bar made by jquery, all the level-2 menus are displayed. How can I show only one menu?

I suggest you add a name for each option on the list to be clicked. The name is the same as the actual list class name.
<Li name = "tr"> Home </li>
<Li name = "tr1"> homepage 2 </li>
<Li name = "tr2"> homepage 3 </li>
<Li name = "tr3"> homepage 4 </li>
<Li name = "tr4"> Home Page 5 </li>
<Li name = "tr5"> homepage 6 </li>
<Li name = "tr6"> homepage 7 </li>
<Li name = "tr7"> homepage 8 </li>

Then jquery
$ (Document). ready (function (){

$ ('# Td li'). click (function (){
$ ("# Men." + $ (this). attr ("name" )).css ("display", "inline ");
});
});

How does jquery control the navigation menu of the current page?

For example, the <div class = "nav"> <a href = "index.html"> homepage </a> <a href = "product.html"> product </a>
The following html content:
<Div class = "main">
<Div class = "content"> homepage content </div>
<Div class = "content"> product content </div>
<Div class = "content"> case center content </div>
</Div>
As for class = "content", you can add it yourself to facilitate jQuery's acquisition, without this style class.
<Script type = "text/javascript">
$ (Document). ready (function ()
{
Var tabs =$ ('. nav> ');
Var cons = $ ('. main> div. content ');

Tabs. first (). addClass ("now"). show (); // The first display by default
Cons. first (). show (). nextAll (). hide (); // The first display is displayed by default, and others are hidden.
Tabs. each (function (index ){
$ (This). mouseover (function (){
$ (This). addClass ("now"). siblings (). removeClass ("now ");
Cons. eq (index). show (). siblings (). hide ();
});
});

});
</Script>

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