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js css实现垂直方向自适应的三角提示菜单

2019-01-05 JavaScript 前端之家

前端之家收集整理的这篇文章主要介绍了js css实现垂直方向自适应的三角提示菜单，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

这是一个比较简单实用的菜单，最重要的是他不需要引用jQuery库。菜单在垂直方向上能做到自适应，当主菜单靠近顶部，子菜单将会在下面，当主菜单靠近底部，子菜单在上面。运用Modernizr的触摸检测功能，我们可以让子菜单的响应在pc上是hover，而在触摸设备上是点击。例子中还示范了如何在宽度比较窄的情况下如何调整布局。

HTML代码

css 代码

/ reset list style /
.cbp-tm-menu,.cbp-tm-menu ul {
list-style: none;
}

/ set menu position; change here to set to relative or float,etc. /
.cbp-tm-menu {
display: block;
position: absolute;
z-index: 1000;
bottom: 0;
width: 100%;
background: #47a3da;
text-align: right;
padding: 0 2em;
margin: 0;
text-transform: capitalize;
}

/ first level menu items /
.cbp-tm-menu > li {
display: inline-block;
margin: 0 2.6em;
position: relative;
}

.cbp-tm-menu > li > a {
line-height: 4em;
padding: 0 0.3em;
font-size: 1.2em;
display: block;
color: #fff;
}

.no-touch .cbp-tm-menu > li > a:hover,.no-touch .cbp-tm-menu > li > a:active {
color: #02639d;
}

/ sumbenu with transitions /
.cbp-tm-submenu {
position: absolute;
display: block;
visibility: hidden;
opacity: 0;
padding: 0;
text-align: left;
pointer-events: none;
-webkit-transition: visibility 0s,opacity 0s;
-moz-transition: visibility 0s,opacity 0s;
transition: visibility 0s,opacity 0s;
}

.cbp-tm-show .cbp-tm-submenu {
width: 16em;
left: 50%;
margin: 0 0 0 -8em;
opacity: 1;
visibility: visible;
pointer-events: auto;
-webkit-transition: visibility 0s,opacity 0.3s;
-moz-transition: visibility 0s,opacity 0.3s;
transition: visibility 0s,opacity 0.3s;
}

.cbp-tm-show-above .cbp-tm-submenu {
bottom: 100%;
padding-bottom: 10px;
}

.cbp-tm-show-below .cbp-tm-submenu {
top: 100%;
padding-top: 10px;
}

/ extreme cases: not enough space on the sides /
.cbp-tm-nospace-right .cbp-tm-submenu {
right: 0;
left: auto;
}

.cbp-tm-nospace-left .cbp-tm-submenu {
left: 0;
}

/ last menu item has to fit on the screen /
.cbp-tm-menu > li:last-child .cbp-tm-submenu {
right: 0;
}

/
arrow: depending on where the menu will be shown,we set
the right position for the arrow
/

.cbp-tm-submenu:after {
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
}

.cbp-tm-show-above .cbp-tm-submenu:after {
top: 100%;
margin-top: -10px;
}

.cbp-tm-show-below .cbp-tm-submenu:after {
bottom: 100%;
margin-bottom: -10px;
}

.cbp-tm-submenu:after {
border-color: transparent;
border-width: 16px;
margin-left: -16px;
left: 50%;
}

.cbp-tm-show-above .cbp-tm-submenu:after {
border-top-color: #fff;
}

.cbp-tm-show-below .cbp-tm-submenu:after {
border-bottom-color: #fff;
}

.cbp-tm-submenu > li {
display: block;
background: #fff;
}

.cbp-tm-submenu > li > a {
padding: 5px 2.3em 5px 0.6em; / top/bottom paddings in 'em' cause a tiny "jump" in Chrome on Win /
display: block;
font-size: 1.2em;
position: relative;
color: #47a3da;
border: 4px solid #fff;
-webkit-transition: all 0.2s;
-moz-transition: all 0.2s;
transition: all 0.2s;
}

.no-touch .cbp-tm-submenu > li > a:hover,.no-touch .cbp-tm-submenu > li > a:active {
color: #fff;
background: #47a3da;
}

/ the icons (main level menu icon and sublevel icons) /
.cbp-tm-submenu li a:before,.cbp-tm-menu > li > a:before {
font-family: 'cbp-tmicons';
speak: none;
font-style: normal;
font-weight: normal;
font-variant: normal;
text-transform: none;
line-height: 1;
vertical-align: middle;
margin-right: 0.6em;
-webkit-font-smoothing: antialiased;
}

.cbp-tm-submenu li a:before {
position: absolute;
top: 50%;
margin-top: -0.5em;
right: 0.5em;
}

.cbp-tm-menu > li > a:not(:only-child):before {
content: "\f0c9";
font-size: 60%;
opacity: 0.3;
}

.cbp-tm-icon-archive:before {
content: "\e002";
}

.cbp-tm-icon-cog:before {
content: "\e003";
}

.cbp-tm-icon-users:before {
content: "\e004";
}

.cbp-tm-icon-earth:before {
content: "\e005";
}

.cbp-tm-icon-location:before {
content: "\e006";
}

.cbp-tm-icon-mobile:before {
content: "\e007";
}

.cbp-tm-icon-screen:before {
content: "\e008";
}

.cbp-tm-icon-mail:before {
content: "\e009";
}

.cbp-tm-icon-contract:before {
content: "\e00a";
}

.cbp-tm-icon-pencil:before {
content: "\e00b";
}

.cbp-tm-icon-article:before {
content: "\e00c";
}

.cbp-tm-icon-clock:before {
content: "\e00d";
}

.cbp-tm-icon-videos:before {
content: "\e00e";
}

.cbp-tm-icon-pictures:before {
content: "\e00f";
}

.cbp-tm-icon-link:before {
content: "\e010";
}

.cbp-tm-icon-refresh:before {
content: "\e011";
}

.cbp-tm-icon-help:before {
content: "\e012";
}

/ Media Queries /
@media screen and (max-width: 55.6875em) {
.cbp-tm-menu {
font-size: 80%;
}
}

@media screen and (max-height: 25.25em),screen and (max-width: 44.3125em) {

.cbp-tm-menu {
font-size: 100%;
position: relative;
text-align: center;
padding: 0;
top: auto;
}

.cbp-tm-menu > li {
display: block;
margin: 0;
border-bottom: 4px solid #3793ca;
}

.cbp-tm-menu > li:first-child {
border-top: 4px solid #3793ca;
}

li.cbp-tm-show > a,.no-touch .cbp-tm-menu > li > a:hover,.no-touch .cbp-tm-menu > li > a:active {
color: #fff;
background: #02639d;
}

.cbp-tm-submenu {
position: relative;
display: none;
width: 100%;
}

.cbp-tm-submenu > li {
padding: 0;
}

.cbp-tm-submenu > li > a {
padding: 0.6em 2.3em 0.6em 0.6em;
border: none;
border-bottom: 2px solid #6fbbe9;
}

.cbp-tm-submenu:after {
display: none;
}

.cbp-tm-menu .cbp-tm-show .cbp-tm-submenu {
display: block;
width: 100%;
left: 0;
margin: 0;
padding: 0;
bottom: auto;
top: auto;
}

}

javascript代码

'use strict';

var document = window.document,docElem = document.documentElement;

function extend( a,b ) {
for( var key in b ) {
if( b.hasOwnProperty( key ) ) {
a[key] = b[key];
}
}
return a;
}

// from https://github.com/ryanve/response.js/blob/master/response.js
function getViewportH() {
var client = docElem['clientHeight'],inner = window['innerHeight'];
if( client < inner )
return inner;
else
return client;
}

// http://stackoverflow.com/a/11396681/989439
function getOffset( el ) {
return el.getBoundingClientRect();
}

// http://snipplr.com/view.php?codeview&id=5259
function isMouseLeaveOrEnter(e,handler) {
if (e.type != 'mouseout' && e.type != 'mouseover') return false;
var reltg = e.relatedTarget ? e.relatedTarget :
e.type == 'mouseout' ? e.toElement : e.fromElement;
while (reltg && reltg != handler) reltg = reltg.parentNode;
return (reltg != handler);
}

function cbpTooltipMenu( el,options ) {
this.el = el;
this.options = extend( this.defaults,options );
this._init();
}

cbpTooltipMenu.prototype = {
defaults : {
// add a timeout to avoid the menu to open instantly
delayMenu : 100
},_init : function() {
this.touch = Modernizr.touch;
this.menuItems = document.querySelectorAll( '#' + this.el.id + ' > li' );
this._initEvents();
},_initEvents : function() {

  var self = this;

  Array.prototype.slice.call( this.menuItems ).forEach( function( el,i ) {
    var trigger = el.querySelector( 'a' );
    if( self.touch ) {
      trigger.addEventListener( 'click',function( ev ) { self._handleClick( this,ev ); } );
    }
    else {
      trigger.addEventListener( 'click',function( ev ) {
        if( this.parentNode.querySelector( 'ul.cbp-tm-submenu' ) ) {
          ev.preventDefault();
        }
      } );
      el.addEventListener( 'mou<a href="https://www.jb51.cc/tag/SEO/" title="SEO">SEO</a>ver',function(ev) { if( isMouseLeaveOrEnter( ev,this ) ) self._openMenu( this ); } );
      el.addEventListener( 'mou<a href="https://www.jb51.cc/tag/SEO/" title="SEO">SEO</a>ut',this ) ) self._closeMenu( this ); } );
    }
  } );

},_openMenu : function( el ) {

  var self = this;
  clearTimeout( this.omtimeout );
  this.omtimeout = setTimeout( function() {
    var submenu = el.querySelector( 'ul.cbp-tm-submenu' );

    if( submenu ) {
      el.className = 'cbp-tm-show';
      if( self._positionMenu( el ) === 'top' ) {
        el.className += ' cbp-tm-show-above';
      }
      else {
        el.className += ' cbp-tm-show-below';
      }
    }
  },this.touch ? 0 : this.options.delayMenu );

},_closeMenu : function( el ) {

  clearTimeout( this.omtimeout );

  var submenu = el.querySelector( 'ul.cbp-tm-submenu' );

  if( submenu ) {
    // based on https://github.com/desandro/classie/blob/master/classie.js
    el.className = el.className.replace(new RegExp("(^|\\s+)" + "cbp-tm-show" + "(\\s+|$)"),' ');
    el.className = el.className.replace(new RegExp("(^|\\s+)" + "cbp-tm-show-below" + "(\\s+|$)"),' ');
    el.className = el.className.replace(new RegExp("(^|\\s+)" + "cbp-tm-show-above" + "(\\s+|$)"),' ');
  }

},_handleClick : function( el,ev ) {
  var item = el.parentNode,items = Array.prototype.slice.call( this.menuItems ),submenu = item.querySelector( 'ul.cbp-tm-submenu' )

  // first close any opened one..
  if( this.current && items.indexOf( item ) !== this.current ) {
    this._closeMenu( this.el.children[ this.current ] );
    this.el.children[ this.current ].querySelector( 'ul.cbp-tm-submenu' ).setAttribute( 'data-open','false' );
  }

  if( submenu ) {
    ev.preventDefault();

    var isOpen = submenu.getAttribute( 'data-open' );

    if( isOpen === 'true' ) {
      this._closeMenu( item );
      submenu.setAttribute( 'data-open','false' );
    }
    else {
      this._openMenu( item );
      this.current = items.indexOf( item );
      submenu.setAttribute( 'data-open','true' );
    }
  }

},_positionMenu : function( el ) {
  // checking where's more space left in the viewport: above or below the element
  var vH = getViewportH(),ot = getOffset(el),spaceUp = ot.top,spaceDown = vH - spaceUp - el.offsetHeight;

  return ( spaceDown <= spaceUp ? 'top' : 'bottom' );
}

}

// add to global namespace
window.cbpTooltipMenu = cbpTooltipMenu;

} )( window );

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程之家。

原文链接：https://www.f2er.com/js/47570.html

js 菜单菜单菜单