Asp.net导航控件真的值得用吗?

时间:2008-10-07 12:14:24  来源:第二电脑网上收集  作者:

  第二电脑网导读:想做几个数据驱动的menu而已。还有那个前台的menu类,那么多的Properties,尤其想到menu类也是个黑盒子,一点都不知道,它生成的xhtml会是什么样的,而我只有一点点css知识而已,想到这里连尝试的欲望都没了。还不如自己动手亲自写一个menu呢,网上好象有好多现成的javascript类,比如这个:            Div_css 结构的...
  正文: 开始接触menu控件,感觉怎么这么别扭啊。
  
  首先说数据访问部分,为了所谓的provider pattern,一层一层的包装,而且都是些黑盒子,虽然概念是挺先进,结构好象也很清楚,但还是让我觉的迷迷糊糊,至于嘛,只是想做几个数据驱动的menu而已。还有那个前台的menu类,那么多的Properties,尤其想到menu类也是个黑盒子,一点都不知道,它生成的xhtml会是什么样的,而我只有一点点Css知识而已,想到这里连尝试的欲望都没了。还不如自己动手亲自写一个menu呢,网上好象有好多现成的JavaScript类,比如这个:
  
  
  
  Div_css 结构的,虽然没有ASP/ target=_blank class=infotextkey>asp.net 控件那么漂亮,可也很是实用,至少都是透明的。不过后台有点麻烦,当时的想法是:
  
  1 设计一个类sitemap,从数据库里读导航信息,然后存到一个dataset中,
  
  2 在application_start 事件处理函数中 实例化一个sitemap 和一个sqlCachedependency ,插入到cache中。
  
  3 一个dependency的回调函数,以更新cache中的数据
  
  4 从cache中提取数据生成menu。
  
  这样一来可以想象default.master的代码的代码会乱七八糟。非但不太容易写,写好的代码也不太容易复用。而且还有关于cache的很多问题。
  
  肯定有其他办法,asp.net好多东西我都没有接触过。不过现在想想 provider pattern还是不错,一层api连接表示层,一层api连接数据访问层。
  
  
  
  被迫学习menu类,希望它不要太让人意外。终于明白为什么开源让那么多人激动,开放透明啊!
  
  
  
  
  /**//*****************************************************
  * yphotoshop/ target=_blank class=infotextkey>pslideOutMenu
  * 3/04/2001
  *
  * a nice little script to create exclusive, slide-out
  * menus for ns4, ns6, mozilla, opera, ie4, ie5 on
  * mac and win32. I've got no linux or unix to test on but
  * it should(?) work...
  *
  * Revised:
  * - 08/29/2002 : added .hideAll()
  * - 04/15/2004 : added .writeCSS() to support more
  *
  
  
  
   than 30 menus.
  *
  * --youngpup--
  *****************************************************/
  ypSlideOutMenu.Registry = []
  ypSlideOutMenu.aniLen = 250
  ypSlideOutMenu.hideDelay = 1000
  ypSlideOutMenu.minCPUResolution = 10
  // constructor
  function ypSlideOutMenu(id, dir, left, top, width, height)
  ...{
  this.ie = document.all ? 1 : 0
  this.ns4 = document.layers ? 1 : 0
  this.dom = document.getElementById ? 1 : 0
  if (this.ie || this.ns4 || this.dom) ...{
  this.id = id
  this.dir = dir
  this.orientation = dir == "left" || dir == "right" ? "h" : "v"
  this.dirType = dir == "right" || dir == "down" ? "-" : "+"
  this.dim = this.orientation == "h" ? width : height
  this.hideTimer = false
  this.aniTimer = false
  this.open = false
  this.over = false
  this.startTime = 0
  this.gRef = "ypSlideOutMenu_"+id
  eval(this.gRef+"=this")
  ypSlideOutMenu.Registry[id] = this
  var d = document
  var strCSS = "";
  strCSS += '#' + this.id + 'Container { visibility:hidden; '
  strCSS += 'left:' + left + 'px; '
  strCSS += 'top:' + top + 'px; '
  strCSS += 'overflow:hidden; z-index:10000; }'
  strCSS += '#' + this.id + 'Container, #' + this.id + 'Content { position:absolute; '
  strCSS += 'width:' + width + 'px; '
  strCSS += 'height:' + height + 'px; '
  strCSS += 'clip:rect(0 ' + width + ' ' + height + ' 0); '
  strCSS += '}'
  this.css = strCSS;
  this.load()
  }
  }
  ypSlideOutMenu.writeCSS = function() ...{
  document.writeln('<style type="text/css">');
  for (var id in ypSlideOutMenu.Registry) ...{
  document.writeln(ypSlideOutMenu.Registry[id].css);
  }
  document.writeln('</style>');
  }
  ypSlideOutMenu.prototype.load = function() ...{
  var d = document
  var lyrId1 = this.id + "Container"
  var lyrId2 = this.id + "Content"
  var obj1 = this.dom ? d.getElementById(lyrId1) : this.ie ? d.all[lyrId1] : d.layers[lyrId1]
  if (obj1) var obj2 = this.ns4 ? obj1.layers[lyrId2] : this.ie ? d.all[lyrId2] : d.getElementById(lyrId2)
  var temp
  if (!obj1 || !obj2) window.setTimeout(this.gRef + ".load()", 100)
  else ...{
  this.container = obj1
  this.menu = obj2
  this.style = this.ns4 ? this.menu : this.menu.style
  this.homePos = eval("0" + this.dirType + this.dim)
  this.outPos = 0
  this.accelConst = (this.outPos - this.homePos) / ypSlideOutMenu.aniLen / ypSlideOutMenu.aniLen
  // set event handlers.
  if (this.ns4) this.menu.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT);
  this.menu.onmouseover = new Function("ypSlideOutMenu.showMenu('" + this.id + "')")
  this.menu.onmouseout = new Function("ypSlideOutMenu.hideMenu('" + this.id + "')")
  //set initial state
  this.endSlide()
  }
  }
  ypSlideOutMenu.showMenu = function(id)
  ...{
  var reg = ypSlideOutMenu.Registry
  var obj = ypSlideOutMenu.Registry[id]
  if (obj.container) ...{
  obj.over = true
  for (menu in reg) if (id != menu) ypSlideOutMenu.hide(menu)
  if (obj.hideTimer) ...{ reg[id].hideTimer = window.clearTimeout(reg[id].hideTimer) }
  if (!obj.open && !obj.aniTimer) reg[id].startSlide(true)
  }
  }
  ypSlideOutMenu.hideMenu = function(id)
  ...{
  var obj = ypSlideOutMenu.Registry[id]
  if (obj.container) ...{
  if (obj.hideTimer) window.clearTimeout(obj.hideTimer)
  obj.hideTimer = window.setTimeout("ypSlideOutMenu.hide('" + id + "')", ypSlideOutMenu.hideDelay);
  }
  }
  ypSlideOutMenu.hideAll = function()
  ...{
  var reg = ypSlideOutMenu.Registry
  for (menu in reg) ...{
  ypSlideOutMenu.hide(menu);
  if (menu.hideTimer) window.clearTimeout(menu.hideTimer);
  }
  }
  ypSlideOutMenu.hide = function(id)
  ...{
  var obj = ypSlideOutMenu.Registry[id]
  obj.over = false
  if (obj.hideTimer) window.clearTimeout(obj.hideTimer)
  obj.hideTimer = 0
  if (obj.open && !obj.aniTimer) obj.startSlide(false)
  }
  ypSlideOutMenu.prototype.startSlide = function(open) ...{
  this[open ? "onactivate" : "ondeactivate"]()
  this.open = open
  if (open) this.setVisibility(true)
  this.startTime = (new Date()).getTime()
  this.aniTimer = window.setInterval(this.gRef + ".slide()", ypSlideOutMenu.minCPUResolution)
  }
  ypSlideOutMenu.prototype.slide = function() ...{
  var elapsed = (new Date()).getTime() - this.startTime
  if (elapsed > ypSlideOutMenu.aniLen) this.endSlide()
  else ...{
  var d = Math.round(Math.pow(ypSlideOutMenu.aniLen-elapsed, 2) * this.accelConst)
  if (this.open && this.dirType == "-") d = -d
  else if (this.open && this.dirType == "+") d = -d
  else if (!this.open && this.dirType == "-") d = -this.dim + d
  else d = this.dim + d
  this.moveTo(d)
  }
  }
  ypSlideOutMenu.prototype.endSlide = function() ...{
  this.aniTimer = window.clearTimeout(this.aniTimer)
  this.moveTo(this.open ? this.outPos : this.homePos)
  if (!this.open) this.setVisibility(false)
  if ((this.open && !this.over) || (!this.open && this.over)) ...{
  this.startSlide(this.over)
  }
  }
  ypSlideOutMenu.prototype.setVisibility = function(bShow) ...{
  var s = this.ns4 ? this.container : this.container.style
  s.visibility = bShow ? "visible" : "hidden"
  }
  ypSlideOutMenu.prototype.moveTo = function(p) ...{
  this.style[this.orientation == "h" ? "left" : "top"] = this.ns4 ? p : p + "px"
  }
  ypSlideOutMenu.prototype.getPos = function(c) ...{
  return parseInt(this.style[c])
  }
  ypSlideOutMenu.prototype.onactivate = function() ...{ }
  ypSlideOutMenu.prototype.ondeactivate = function() ...{ }
"Asp.net导航控件真的值得用吗?"由第二电脑网原创提供,转载请注明:http://www.002pc.com/master/College/Programming/ASP/2008-10-07/3252.html


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