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用 Javascript 制作可暂停的滚动公告板

作者: Dynamic Drive     来源: DynamicDrive.com     时间: 2006-07-14 11:44:19
摘要: 这是转载国外的 Javascript 可暂停滚动公告板代码，可定制性非常强，滚动时间可以任意设置，显示样式由CSS控制，可以很容易的整合在您自己的网站上。对于懂PHP的很容易做一个动态的新闻公告板及其他应用。
归类: Javascript,

关键词: 可暂停, 滚动, 公告板, Javascript, js特效,

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。

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点击这里查看示例
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代码：

将以下代码放在网页的<head></head>之间。

CSS:
  1.  
  2. <style type="text/css"> 
  3.  
  4. /*Example CSS for the two demo scrollers*/ 
  5.  
  6. #pscroller1{ 
  7. width: 200px; 
  8. height: 100px; 
  9. border: 1px solid black; 
  10. padding: 5px; 
  11. background-color: lightyellow; 
  12. } 
  13.  
  14. #pscroller2{ 
  15. width: 450px; 
  16. height: 22px; 
  17. border: 1px solid black; 
  18. padding: 3px; 
  19. } 
  20.  
  21. #pscroller2 a{ 
  22. text-decoration: none; 
  23. } 
  24.  
  25. .someclass{ //class to apply to your scroller(s) if desired 
  26. } 
  27.  
  28. BODY, td, div { 
  29. FONT-SIZE: 12px; FONT-FAMILY: Verdana, Arial, Helvetica, sans-serif 
  30. } 
  31. A { 
  32. COLOR: #003499; TEXT-DECORATION: none; FONT-SIZE: 12px; 
  33. } 
  34. A:hover { 
  35. COLOR: #000000; TEXT-DECORATION: underline; FONT-SIZE: 12px; 
  36. } 
  37.  
  38. </style> 
  39.  
  40.  


Javascript:
  1.  
  2.  
  3. <script type="text/javascript"> 
  4.  
  5. /*Example message arrays for the two demo scrollers*/ 
  6.  
  7. var pausecontent=new Array() 
  8. pausecontent[0]='<a href="http://www.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。' 
  9. 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。' 
  10.  
  11. var pausecontent2=new Array() 
  12. pausecontent2[0]='<a href="http://www.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>' 
  13. 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> ' 
  14.  
  15. </script> 
  16.  
  17. <script type="text/javascript"> 
  18.  
  19. /*********************************************** 
  20. * Pausing up-down scroller- ? Dynamic Drive (www.dynamicdrive.com) 
  21. * This notice MUST stay intact for legal use 
  22. * Visit http://www.dynamicdrive.com/ for this script and 100s more. 
  23. ***********************************************/ 
  24.  
  25. function pausescroller(content, divId, divClass, delay){ 
  26.     this.content=content //message array content 
  27.     this.tickerid=divId //ID of ticker div to display information 
  28.     this.delay=delay //Delay between msg change, in miliseconds. 
  29.     this.mouseoverBol=0 //Boolean to indicate whether mouse is currently over scroller (and pause it if it is) 
  30.     this.hiddendivpointer=1 //index of message array for hidden div 
  31.     document.write('<div id="'+divId+'" class="'+divClass+'" style="position: relative; overflow: hidden"><div class="innerDiv" style 
  32.  
  33. ="position: absolute; width: 100%" id="'+divId+'1">'+content[0]+'</div><div class="innerDiv" style="position: absolute; width: 100%;  
  34.  
  35. visibility: hidden" id="'+divId+'2">'+content[1]+'</div></div>') 
  36.     var scrollerinstance=this 
  37.     if (window.addEventListener) //run onload in DOM2 browsers 
  38.         window.addEventListener("load", function(){scrollerinstance.initialize()}, false) 
  39.     else if (window.attachEvent) //run onload in IE5.5+ 
  40.         window.attachEvent("onload", function(){scrollerinstance.initialize()}) 
  41.     else if (document.getElementById) //if legacy DOM browsers, just start scroller after 0.5 sec 
  42.     setTimeout(function(){scrollerinstance.initialize()}, 500) 
  43. } 
  44.  
  45. // ------------------------------------------------------------------- 
  46. // initialize()- Initialize scroller method. 
  47. // -Get div objects, set initial positions, start up down animation 
  48. // ------------------------------------------------------------------- 
  49.  
  50. pausescroller.prototype.initialize=function(){ 
  51.     this.tickerdiv=document.getElementById(this.tickerid) 
  52.     this.visiblediv=document.getElementById(this.tickerid+"1") 
  53.     this.hiddendiv=this.hiddendiv=document.getElementById(this.tickerid+"2") 
  54.     this.visibledivtop=parseInt(pausescroller.getCSSpadding(this.tickerdiv)) 
  55.     //set width of inner DIVs to outer DIV's width minus padding (padding assumed to be top padding x 2) 
  56.     this.visiblediv.style.width=this.hiddendiv.style.width=this.tickerdiv.offsetWidth-(this.visibledivtop*2)+"px" 
  57.     this.getinline(this.visiblediv, this.hiddendiv) 
  58.     this.hiddendiv.style.visibility="visible" 
  59.     var scrollerinstance=this 
  60.     this.tickerdiv.onmouseover=function(){scrollerinstance.mouseoverBol=1} 
  61.     this.tickerdiv.onmouseout=function(){scrollerinstance.mouseoverBol=0} 
  62.     setTimeout(function(){scrollerinstance.animateup()}, this.delay) 
  63. } 
  64.  
  65.  
  66. // ------------------------------------------------------------------- 
  67. // animateup()- Move the two inner divs of the scroller up and in sync 
  68. // ------------------------------------------------------------------- 
  69.  
  70. pausescroller.prototype.animateup=function(){ 
  71.     var scrollerinstance=this 
  72.     if (parseInt(this.hiddendiv.style.top)>(this.visibledivtop+5)){ 
  73.         this.visiblediv.style.top=parseInt(this.visiblediv.style.top)-5+"px" 
  74.         this.hiddendiv.style.top=parseInt(this.hiddendiv.style.top)-5+"px" 
  75.         setTimeout(function(){scrollerinstance.animateup()}, 50) 
  76.     }else{ 
  77.         this.getinline(this.hiddendiv, this.visiblediv) 
  78.         this.swapdivs() 
  79.         setTimeout(function(){scrollerinstance.setmessage()}, this.delay) 
  80.     } 
  81. } 
  82.  
  83. // ------------------------------------------------------------------- 
  84. // swapdivs()- Swap between which is the visible and which is the hidden div 
  85. // ------------------------------------------------------------------- 
  86.  
  87. pausescroller.prototype.swapdivs=function(){ 
  88.     var tempcontainer=this.visiblediv 
  89.     this.visiblediv=this.hiddendiv 
  90.     this.hiddendiv=tempcontainer 
  91. } 
  92.  
  93. pausescroller.prototype.getinline=function(div1, div2){ 
  94.     div1.style.top=this.visibledivtop+"px" 
  95.     div2.style.top=Math.max(div1.parentNode.offsetHeight, div1.offsetHeight)+"px" 
  96. } 
  97.  
  98. // ------------------------------------------------------------------- 
  99. // setmessage()- Populate the hidden div with the next message before it's visible 
  100. // ------------------------------------------------------------------- 
  101.  
  102. pausescroller.prototype.setmessage=function(){ 
  103.     var scrollerinstance=this 
  104.     if (this.mouseoverBol==1) //if mouse is currently over scoller, do nothing (pause it) 
  105.         setTimeout(function(){scrollerinstance.setmessage()}, 100) 
  106.     else{ 
  107.         var i=this.hiddendivpointer 
  108.         var ceiling=this.content.length 
  109.         this.hiddendivpointer=(i+1>ceiling-1)? 0 : i+1 
  110.         this.hiddendiv.innerHTML=this.content[this.hiddendivpointer] 
  111.         this.animateup() 
  112.     } 
  113. } 
  114.  
  115. pausescroller.getCSSpadding=function(tickerobj){ //get CSS padding value, if any 
  116.     if (tickerobj.currentStyle) 
  117.         return tickerobj.currentStyle["paddingTop"] 
  118.     else if (window.getComputedStyle) //if DOM2 
  119.         return window.getComputedStyle(tickerobj, "").getPropertyValue("padding-top") 
  120.     else 
  121.         return 0 
  122. } 
  123.  
  124. </script> 
  125.  
  126.  


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。

Javascript:
  1.  
  2. <script type="text/javascript"> 
  3.  
  4. //new pausescroller(name_of_message_array, CSS_ID, CSS_classname, pause_in_miliseconds) 
  5.  
  6. new pausescroller(pausecontent, "pscroller1", "someclass", 3000) 
  7. document.write("<br />") 
  8. new pausescroller(pausecontent2, "pscroller2", "someclass", 2000) 
  9.  
  10. </script> 
  11.  



调用说明：
Code:

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：
CSS:
  1.  
  2. #pscroller1{ 
  3. width: 200px; 
  4. height: 100px; 
  5. border: 1px solid black; 
  6. padding: 5px; 
  7. background-color: lightyellow; 
  8. } 
  9.  


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。



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