用 Javascript 制作可暂停的滚动公告板

由标题很容易看出来,这是一个可以在显示每一个消息时都会暂停的动态滚动条,滚动条的样式完全由CSS控制,当然也包括显示尺寸。调整尺寸后就可以很容易的制作出一个单行的滚动公告板。

用 Javascript 制作可暂停的滚动公告板 – 示例

代码:

将以下代码放在网页的<head></head>之间。

 
<style type="text/css">

/*Example CSS for the two demo scrollers*/

#pscroller1{
width: 200px;
height: 100px;
border: 1px solid black;
padding: 5px;
background-color: lightyellow;
}

#pscroller2{
width: 450px;
height: 22px;
border: 1px solid black;
padding: 3px;
}

#pscroller2 a{
text-decoration: none;
}

.someclass{ //class to apply to your scroller(s) if desired
}

BODY, td, div {
FONT-SIZE: 12px; FONT-FAMILY: Verdana, Arial, Helvetica, sans-serif
}
A {
COLOR: #003499; TEXT-DECORATION: none; FONT-SIZE: 12px;
}
A:hover {
COLOR: #000000; TEXT-DECORATION: underline; FONT-SIZE: 12px;
}

</style>
 
<script type="text/javascript">

/*Example message arrays for the two demo scrollers*/

var pausecontent=new Array()
pausecontent[0]='<a href="http://YITU.org">艺图</a><br />欣赏高质量的国外艺术大师作品图片。欣赏经典名作,体味艺术人生。'
pausecontent[1]='<a href="http://www.codebit.cn">CodeBit.cn</a><br />收录经典小段代码,翻译转载国外优秀技术文章。'

var pausecontent2=new Array()
pausecontent2[0]='<a href="http://YITU.org">【艺图】 欣赏高质量的国外艺术大师作品图片。欣赏经典名作,体味艺术人生。</a>'
pausecontent2[1]='<a href="http://www.codebit.cn">【CodeBit.cn】 收录经典小段代码,翻译转载国外优秀技术文章。</a> '

</script>

<script type="text/javascript">

/***********************************************
* Pausing up-down scroller- ? Dynamic Drive (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for this script and 100s more.
***********************************************/

function pausescroller(content, divId, divClass, delay){
	this.content=content //message array content
	this.tickerid=divId //ID of ticker div to display information
	this.delay=delay //Delay between msg change, in miliseconds.
	this.mouseoverBol=0 //Boolean to indicate whether mouse is currently over scroller (and pause it if it is)
	this.hiddendivpointer=1 //index of message array for hidden div
	document.write('<div id="'+divId+'" class="'+divClass+'" style="position: relative; overflow: hidden"><div class="innerDiv" style

="position: absolute; width: 100%" id="'+divId+'1">'+content[0]+'</div><div class="innerDiv" style="position: absolute; width: 100%; 

visibility: hidden" id="'+divId+'2">'+content[1]+'</div></div>')
	var scrollerinstance=this
	if (window.addEventListener) //run onload in DOM2 browsers
		window.addEventListener("load", function(){scrollerinstance.initialize()}, false)
	else if (window.attachEvent) //run onload in IE5.5+
		window.attachEvent("onload", function(){scrollerinstance.initialize()})
	else if (document.getElementById) //if legacy DOM browsers, just start scroller after 0.5 sec
	setTimeout(function(){scrollerinstance.initialize()}, 500)
}

// -------------------------------------------------------------------
// initialize()- Initialize scroller method.
// -Get div objects, set initial positions, start up down animation
// -------------------------------------------------------------------

pausescroller.prototype.initialize=function(){
	this.tickerdiv=document.getElementById(this.tickerid)
	this.visiblediv=document.getElementById(this.tickerid+"1")
	this.hiddendiv=this.hiddendiv=document.getElementById(this.tickerid+"2")
	this.visibledivtop=parseInt(pausescroller.getCSSpadding(this.tickerdiv))
	//set width of inner DIVs to outer DIV's width minus padding (padding assumed to be top padding x 2)
	this.visiblediv.style.width=this.hiddendiv.style.width=this.tickerdiv.offsetWidth-(this.visibledivtop*2)+"px"
	this.getinline(this.visiblediv, this.hiddendiv)
	this.hiddendiv.style.visibility="visible"
	var scrollerinstance=this
	this.tickerdiv.onmouseover=function(){scrollerinstance.mouseoverBol=1}
	this.tickerdiv.onmouseout=function(){scrollerinstance.mouseoverBol=0}
	setTimeout(function(){scrollerinstance.animateup()}, this.delay)
}


// -------------------------------------------------------------------
// animateup()- Move the two inner divs of the scroller up and in sync
// -------------------------------------------------------------------

pausescroller.prototype.animateup=function(){
	var scrollerinstance=this
	if (parseInt(this.hiddendiv.style.top)>(this.visibledivtop+5)){
		this.visiblediv.style.top=parseInt(this.visiblediv.style.top)-5+"px"
		this.hiddendiv.style.top=parseInt(this.hiddendiv.style.top)-5+"px"
		setTimeout(function(){scrollerinstance.animateup()}, 50)
	}else{
		this.getinline(this.hiddendiv, this.visiblediv)
		this.swapdivs()
		setTimeout(function(){scrollerinstance.setmessage()}, this.delay)
	}
}

// -------------------------------------------------------------------
// swapdivs()- Swap between which is the visible and which is the hidden div
// -------------------------------------------------------------------

pausescroller.prototype.swapdivs=function(){
	var tempcontainer=this.visiblediv
	this.visiblediv=this.hiddendiv
	this.hiddendiv=tempcontainer
}

pausescroller.prototype.getinline=function(div1, div2){
	div1.style.top=this.visibledivtop+"px"
	div2.style.top=Math.max(div1.parentNode.offsetHeight, div1.offsetHeight)+"px"
}

// -------------------------------------------------------------------
// setmessage()- Populate the hidden div with the next message before it's visible
// -------------------------------------------------------------------

pausescroller.prototype.setmessage=function(){
	var scrollerinstance=this
	if (this.mouseoverBol==1) //if mouse is currently over scoller, do nothing (pause it)
		setTimeout(function(){scrollerinstance.setmessage()}, 100)
	else{
		var i=this.hiddendivpointer
		var ceiling=this.content.length
		this.hiddendivpointer=(i+1>ceiling-1)? 0 : i+1
		this.hiddendiv.innerHTML=this.content[this.hiddendivpointer]
		this.animateup()
	}
}

pausescroller.getCSSpadding=function(tickerobj){ //get CSS padding value, if any
	if (tickerobj.currentStyle)
		return tickerobj.currentStyle["paddingTop"]
	else if (window.getComputedStyle) //if DOM2
		return window.getComputedStyle(tickerobj, "").getPropertyValue("padding-top")
	else
		return 0
}

</script>

然后将下面的代码插入到网页的<body></body>之间,可以放在你想显示的任意位置。

 
<script type="text/javascript">

//new pausescroller(name_of_message_array, CSS_ID, CSS_classname, pause_in_miliseconds)

new pausescroller(pausecontent, "pscroller1", "someclass", 3000)
document.write("<br />")
new pausescroller(pausecontent2, "pscroller2", "someclass", 2000)

</script>

调用说明:

new pausescroller(pausecontent, "pscroller1", "someclass", 3000)

其中 pausecontent 是你在<head></head>之间的代码定义的显示内容。pscroller1 是你在CSS中定义的唯一的滚动层ID, someclass 是任意您想附加的显示样式, 3000 是控制暂停的时间,以毫秒为单位。

控制显示样式的方法就是用标准的CSS语法:

 
#pscroller1{
width: 200px;
height: 100px;
border: 1px solid black;
padding: 5px;
background-color: lightyellow;
}

如果想创建单行的滚动条可以简单的将 height 值改为 20px 或是 25px 即可。

可暂停的滚动公告板,就这样完成了。

《用 Javascript 制作可暂停的滚动公告板》有1个想法

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