□刚开始接触menu控件,感觉怎么这么别扭...... 刚开始接触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.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! /**//***************************************************** * ypSlideOutMenu * 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(''); } 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() ...{ } |
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