Question

我正在为网站开发一个滑块，但不知道如何将其置于自动模式下，以便滑块自动滑动。我只是希望滑块在一定时间后自动更换面板请帮帮我。

`

;（功能（窗口）{

'use strict';

// based on http://responsejs.com/labs/dimensions/
function getViewport(axis) {
    var client, inner;
    if( axis === 'x' ) {
        client = docElem['clientWidth'];
        inner = window['innerWidth'];
    }
    else if( axis === 'y' ) {
        client = docElem['clientHeight'];
        inner = window['innerHeight'];
    }

    return client < inner ? inner : client;
}

var docElem = window.document.documentElement,
    transEndEventNames = {
        'WebkitTransition': 'webkitTransitionEnd',
        'MozTransition': 'transitionend',
        'OTransition': 'oTransitionEnd',
        'msTransition': 'MSTransitionEnd',
        'transition': 'transitionend'
    },
    transEndEventName = transEndEventNames[ Modernizr.prefixed( 'transition' ) ],
    support = { transitions : Modernizr.csstransitions },
    win = { width : getViewport('x'), height : getViewport('y') };

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

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

BoxesFx.prototype.options = {}

BoxesFx.prototype._init = function() {
    // set transforms configuration
    this._setTransforms();
    // which effect
    this.effect = this.el.getAttribute( 'data-effect' ) || 'effect-1';
    // check if animating
    this.isAnimating = false;
    // the panels
    this.panels = [].slice.call( this.el.querySelectorAll( '.panel' ) );
    // total number of panels (4 for this demo)
    //this.panelsCount = this.panels.length;
    this.panelsCount = 4;
    // current panel´s index
    this.current = 0;
    classie.add( this.panels[0], 'current' );
    // replace image with 4 divs, each including the image
    var self = this;
    this.panels.forEach( function( panel ) {
        var img = panel.querySelector( 'img' ), imgReplacement = '';
        for( var i = 0; i < self.panelsCount; ++i ) {
            imgReplacement += '<div class="bg-tile"><div class="bg-img"><img src="' + img.src + '" /></div></div>'
        }
        panel.removeChild( img );
        panel.innerHTML = imgReplacement + panel.innerHTML;
    } );
    // add navigation element
    this.nav = document.createElement( 'nav' );
    this.nav.innerHTML = '<span class="prev"><i></i></span><span class="next"><i></i></span>';
    this.el.appendChild( this.nav );
    // initialize events
    this._initEvents();
}

// set the transforms per effect
// we have defined both the next and previous action transforms for each panel
BoxesFx.prototype._setTransforms = function() {
    this.transforms = {
        'effect-1' : {
            'next' : [
                'translate3d(0, ' + (win.height/2+10) + 'px, 0)', // transforms for 1 panel
                'translate3d(-' + (win.width/2+10) + 'px, 0, 0)', // transforms for 2 panel
                'translate3d(' + (win.width/2+10) + 'px, 0, 0)', // transforms for 3 panel
                'translate3d(0, -' + (win.height/2+10) + 'px, 0)' // transforms for 4 panel
            ],
            'prev' : [
                'translate3d(' + (win.width/2+10) + 'px, 0, 0)',
                'translate3d(0, ' + (win.height/2+10) + 'px, 0)',
                'translate3d(0, -' + (win.height/2+10) + 'px, 0)',
                'translate3d(-' + (win.width/2+10) + 'px, 0, 0)'
            ]
        },
        'effect-2' : {
            'next' : [
                'translate3d(-' + (win.width/2+10) + 'px, 0, 0)',
                'translate3d(' + (win.width/2+10) + 'px, 0, 0)',
                'translate3d(-' + (win.width/2+10) + 'px, 0, 0)',
                'translate3d(' + (win.width/2+10) + 'px, 0, 0)'
            ],
            'prev' : [
                'translate3d(0,-' + (win.height/2+10) + 'px, 0)',
                'translate3d(0,-' + (win.height/2+10) + 'px, 0)',
                'translate3d(0,' + (win.height/2+10) + 'px, 0)',
                'translate3d(0,' + (win.height/2+10) + 'px, 0)'
            ]
        },
        'effect-3' : {
            'next' : [
                'translate3d(0,' + (win.height/2+10) + 'px, 0)',
                'translate3d(0,' + (win.height/2+10) + 'px, 0)',
                'translate3d(0,' + (win.height/2+10) + 'px, 0)',
                'translate3d(0,' + (win.height/2+10) + 'px, 0)'
            ],
            'prev' : [
                'translate3d(0,-' + (win.height/2+10) + 'px, 0)',
                'translate3d(0,-' + (win.height/2+10) + 'px, 0)',
                'translate3d(0,-' + (win.height/2+10) + 'px, 0)',
                'translate3d(0,-' + (win.height/2+10) + 'px, 0)'
            ]
        }
    };  
}

BoxesFx.prototype._initEvents = function() {
    var self = this, navctrls = this.nav.children;
    // previous action
    navctrls[0].addEventListener( 'click', function() { self._navigate('prev') } );
    // next action
    navctrls[1].addEventListener( 'click', function() { self._navigate('next') } );
    // window resize
    window.addEventListener( 'resize', function() { self._resizeHandler(); } );
}

// goto next or previous slide
BoxesFx.prototype._navigate = function( dir ) {
    if( this.isAnimating ) return false;
    this.isAnimating = true;

    var self = this, currentPanel = this.panels[ this.current ];

    if( dir === 'next' ) {
        this.current = this.current < this.panelsCount - 1 ? this.current + 1 : 0;          
    }
    else {
        this.current = this.current > 0 ? this.current - 1 : this.panelsCount - 1;
    }

    // next panel to be shown
    var nextPanel = this.panels[ this.current ];
    // add class active to the next panel to trigger its animation
    classie.add( nextPanel, 'active' );
    // apply the transforms to the current panel
    this._applyTransforms( currentPanel, dir );

    // let´s track the number of transitions ended per panel
    var cntTransTotal = 0,

        // transition end event function
        onEndTransitionFn = function( ev ) {
            if( ev && !classie.has( ev.target, 'bg-img' ) ) return false;

            // return if not all panel transitions ended
            ++cntTransTotal;
            if( cntTransTotal < self.panelsCount ) return false;

            if( support.transitions ) {
                this.removeEventListener( transEndEventName, onEndTransitionFn );
            }

            // remove current class from current panel and add it to the next one
            classie.remove( currentPanel, 'current' );
            classie.add( nextPanel, 'current' );
            // reset transforms for the currentPanel
            self._resetTransforms( currentPanel );
            // remove class active
            classie.remove( nextPanel, 'active' );
            self.isAnimating = false;
        };

    if( support.transitions ) {
        currentPanel.addEventListener( transEndEventName, onEndTransitionFn );
    }
    else {
        onEndTransitionFn();
    }
}

BoxesFx.prototype._applyTransforms = function( panel, dir ) {
    var self = this;
    [].slice.call( panel.querySelectorAll( 'div.bg-img' ) ).forEach( function( tile, pos ) {
        tile.style.WebkitTransform = self.transforms[self.effect][dir][pos];
        tile.style.transform = self.transforms[self.effect][dir][pos];
    } );
}

BoxesFx.prototype._resetTransforms = function( panel ) {
    [].slice.call( panel.querySelectorAll( 'div.bg-img' ) ).forEach( function( tile ) {
        tile.style.WebkitTransform = 'none';
        tile.style.transform = 'none';
    } );
}

BoxesFx.prototype._resizeHandler = function() {
    var self = this;
    function delayed() {
        self._resize();
        self._resizeTimeout = null;
    }
    if ( this._resizeTimeout ) {
        clearTimeout( this._resizeTimeout );
    }
    this._resizeTimeout = setTimeout( delayed, 50 );
}

BoxesFx.prototype._resize = function() {
    win.width = getViewport('x');
    win.height = getViewport('y');
    this._setTransforms();
}

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

}）（窗口）; `

Answer 1

参考https://www.w3schools.com/w3css/w3css_slideshow.asp

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<style>
.mySlides {display:none;}
</style>
<body>

<h2 class="w3-center">Automatic Slideshow</h2>

<div class="w3-content w3-section" style="max-width:500px">
  <img class="mySlides" src="img_la.jpg" style="width:100%">
  <img class="mySlides" src="img_ny.jpg" style="width:100%">
  <img class="mySlides" src="img_chicago.jpg" style="width:100%">
</div>

<script>
var myIndex = 0;
carousel();

function carousel() {
    var i;
    var x = document.getElementsByClassName("mySlides");
    for (i = 0; i < x.length; i++) {
       x[i].style.display = "none";  
    }
    myIndex++;
    if (myIndex > x.length) {myIndex = 1}    
    x[myIndex-1].style.display = "block";  
    setTimeout(carousel, 2000); // Change image every 2 seconds
}
</script>

</body>
</html>

Answer 2

尝试使用setInterval函数。i = i++ % 2它将控制navctrl 0和1

BoxesFx.prototype._initEvents = function() {
    var self = this, navctrls = this.nav.children;
    // previous action
    navctrls[0].addEventListener( 'click', function() { self._navigate('prev') } );
    // next action
    navctrls[1].addEventListener( 'click', function() { self._navigate('next') } );
    // window resize
    window.addEventListener( 'resize', function() { self._resizeHandler(); } );
    var i=0;
    setInterval(function(){
    navctrls[i].trigger('click')
   i = i++ % 2
    },1000)
}

在滑块中插入计时器

2 个答案: