在淘宝旅行上看到的城市选择效果,感觉还不错,就自己的理解重新实现一遍,先看效果(有人说IE9下面有BUG,LZ用的是落后的XP,居然装不上IE9,去公司在搞搞好了),然后再细说实现原理,支持鼠标上下键选择城市,支持直接输入城市名称,拼音首字母,全拼,支持IE6遮盖SELECT,压缩后12K。
实现的步骤:
一、先用一定的格式罗列出控件所需要的城市以及拼音等,我这里是按照如下格式罗列成一个数组, 如果需要增加城市,直接增加在数组里面即可:
城市我是一个一个手打的。。。
['北京|beijing|bj','上海|shanghai|sh', '重庆|chongqing|cq']
二、因为控件的城市分组按好几类划分,比如:按首字母HOT 、ABCDEFH 、 IJKLMNOP 、 QRSTUVWXYZ 四组划分,
而划分了四组后又按照了首字母划分,所以我用正则表达式和循环把数组重新格式化为一个分组对象,热门城市取前16条。
对象格式如下:
{HOT:{hot:[]},ABCDEFGH:{a:[1,2,3],b:[1,2,3]},IJKLMNOP:{i:[1.2.3],j:[1,2,3]},QRSTUVWXYZ:{}}
所用代码如下:
/* * * 格式化城市数组为对象oCity,按照a-h,i-p,q-z,hot热门城市分组: * {HOT:{hot:[]},ABCDEFGH:{a:[1,2,3],b:[1,2,3]},IJKLMNOP:{i:[1.2.3],j:[1,2,3]},QRSTUVWXYZ:{}} * */ (function () { var citys = Vcity.allCity, match, letter, regEx = Vcity.regEx, reg2 = /^[a-h]$/i, reg3 = /^[i-p]$/i, reg4 = /^[q-z]$/i; if (!Vcity.oCity) { Vcity.oCity = {hot:{},ABCDEFGH:{}, IJKLMNOP:{}, QRSTUVWXYZ:{}}; //console.log(citys.length); for (var i = 0, n = citys.length; i < n; i++) { match = regEx.exec(citys[i]); letter = match[3].toUpperCase(); if (reg2.test(letter)) { if (!Vcity.oCity.ABCDEFGH[letter]) Vcity.oCity.ABCDEFGH[letter] = []; Vcity.oCity.ABCDEFGH[letter].push(match[1]); } else if (reg3.test(letter)) { if (!Vcity.oCity.IJKLMNOP[letter]) Vcity.oCity.IJKLMNOP[letter] = []; Vcity.oCity.IJKLMNOP[letter].push(match[1]); } else if (reg4.test(letter)) { if (!Vcity.oCity.QRSTUVWXYZ[letter]) Vcity.oCity.QRSTUVWXYZ[letter] = []; Vcity.oCity.QRSTUVWXYZ[letter].push(match[1]); } /* 热门城市 前16条 */ if(i<16){ if(!Vcity.oCity.hot['hot']) Vcity.oCity.hot['hot'] = []; Vcity.oCity.hot['hot'].push(match[1]); } } } })();
三、然后先照着淘宝旅行里面的样子弄出HTML与CSS;这里略过。
四、然后开始建立CitySelector构造函数,根据城市对象,构建生成DOM对象,在按照相应的事件触发。在生成相应的按照A\B\C\D……分组的时候遇到一个
关于排序的问题,我的对象格式是这样的ABCDEFGH:{a:[1,2,3],b:[1,2,3],c:[1,2,3]},里面的小数组要按照字母的顺序排序,但是我用for……in循环生成
出来是乱的,咨询了群里的高人后,处理方法如下:这里单独把KEY拿出来组成一个数组,然后排序后,在根据数组的值作为KEY值,来读取对象!
sortKey=[]; for(ckey in oCity[key]){ sortKey.push(ckey); // ckey按照ABCDEDG顺序排序 sortKey.sort(); } for(var j=0,k = sortKey.length;j<k;j++){ odl = document.createElement('dl'); odt = document.createElement('dt'); odd = document.createElement('dd'); odt.innerHTML = sortKey[j] == 'hot'"#">' + oCity[key][sortKey[j]][i] + '</a>'; odda.push(str); }
五、鼠标上下键移动选择城市的处理方法:在城市弹出后记录一个this.count = 0;然后再获取上下键的按键事件中分别对count值加一或者减一,
当然count的最大值不能大于筛选出来的城市数组的长度,超过长度后归0,小于0后赋值最大值,然后把this.count的值,来作为数组的标获取相应的城市项:
switch(keycode){ case 40: //向下箭头↓ this.count++; if(this.count > len-1) this.count = 0; for(var i=0;i<len;i++){ Vcity._m.removeClass('on',lis[i]); } Vcity._m.addClass('on',lis[this.count]); break; case 38: //向上箭头↑ this.count--; if(this.count<0) this.count = len-1; for(i=0;i<len;i++){ Vcity._m.removeClass('on',lis[i]); } Vcity._m.addClass('on',lis[this.count]); break; case 13: // enter键 this.input.value = Vcity.regExChiese.exec(lis[this.count].innerHTML)[0]; Vcity._m.addClass('hide',this.ul); Vcity._m.addClass('hide',this.ul); /* IE6 */ Vcity._m.addClass('hide',this.myIframe); break; default: break; }
六、IE中对SELECT的遮挡也是一个增加代码的地方,因为城市弹出框的大小是变化的,然后下拉的城市列也是根据筛选出来的值而变化,所以得每操作一个变化的地方的时候就重新给iframe设置长度和宽度,苦逼的处理方法啊,所以就多了这样一个方法,然后在改变尺寸的时候,应用一下就可以了。
/* IE6的改变遮罩SELECT 的 IFRAME尺寸大小 */ changeIframe:function(){ if(!this.isIE6)return; this.myIframe.style.width = this.rootDiv.offsetWidth + 'px'; this.myIframe.style.height = this.rootDiv.offsetHeight + 'px'; }
7、弹出框的取消问题,这个问题最开始我是设置document的click事件关闭层,然后再弹出的层上阻止click事件的冒泡,但是这样两个层有同时出现的可能,
// 设置点击文档隐藏弹出的城市选择框 Vcity._m.on(document, 'click', function (event) { event = Vcity._m.getEvent(event); var target = Vcity._m.getTarget(event); if(target == that.input) return false; //console.log(target.className); if (that.cityBox)Vcity._m.addClass('hide', that.cityBox); if (that.ul)Vcity._m.addClass('hide', that.ul); if(that.myIframe)Vcity._m.addClass('hide',that.myIframe); });
8、输入框输入拼音或者文字或者拼音首字母筛选城市,这个就是直接用正则表达式在最开始的数组里面筛选数据即可:
var reg = new RegExp("^" + value + "|\\|" + value, 'gi'); var searchResult = []; for (var i = 0, n = Vcity.allCity.length; i < n; i++) { if (reg.test(Vcity.allCity[i])) { var match = Vcity.regEx.exec(Vcity.allCity[i]); if (searchResult.length !== 0) { str = '<li><b class="cityname">' + match[1] + '</b><b class="cityspell">' + match[2] + '</b></li>'; } else { str = '<li class="on"><b class="cityname">' + match[1] + '</b><b class="cityspell">' + match[2] + '</b></li>'; } searchResult.push(str); } }
然后总的JS代码如下:
/* * * ---------------------------------------- * * 城市选择组件 v1.0 * Author: VVG * QQ: 83816819 * Mail: mysheller@163.com * http://www.cnblogs.com/NNUF/ * ---------------------------------------- * * Date: 2012-07-10 * ---------------------------------------- * * */ /* * * 全局空间 Vcity * */ var Vcity = {}; /* * * 静态方法集 * @name _m * */ Vcity._m = { /* 选择元素 */ $:function (arg, context) { var tagAll, n, eles = [], i, sub = arg.substring(1); context = context || document; if (typeof arg == 'string') { switch (arg.charAt(0)) { case '#': return document.getElementById(sub); break; case '.': if (context.getElementsByClassName) return context.getElementsByClassName(sub); tagAll = Vcity._m.$('*', context); n = tagAll.length; for (i = 0; i < n; i++) { if (tagAll[i].className.indexOf(sub) > -1) eles.push(tagAll[i]); } return eles; break; default: return context.getElementsByTagName(arg); break; } } }, /* 绑定事件 */ on:function (node, type, handler) { node.addEventListener "(^|\\s+)" + c + "(\\s+|$)", "g"); if(!Vcity._m.hasClass(c,node))return; node.className = reg.test(node.className) "tip">热门城市(支持汉字/拼音)</p>', '<ul>', '<li class="on">热门城市</li>', '<li>ABCDEFGH</li>', '<li>IJKLMNOP</li>', '<li>QRSTUVWXYZ</li>', '</ul>' ]; /* * * 城市控件构造函数 * @CitySelector * */ Vcity.CitySelector = function () { this.initialize.apply(this, arguments); }; Vcity.CitySelector.prototype = { constructor:Vcity.CitySelector, /* 初始化 */ initialize :function (options) { var input = options.input; this.input = Vcity._m.$('#'+ input); this.inputEvent(); }, /* * * @createWarp * 创建城市BOX HTML 框架 * */ createWarp:function(){ var inputPos = Vcity._m.getPos(this.input); var div = this.rootDiv = document.createElement('div'); var that = this; // 设置DIV阻止冒泡 Vcity._m.on(this.rootDiv,'click',function(event){ Vcity._m.stopPropagation(event); }); // 设置点击文档隐藏弹出的城市选择框 Vcity._m.on(document, 'click', function (event) { event = Vcity._m.getEvent(event); var target = Vcity._m.getTarget(event); if(target == that.input) return false; //console.log(target.className); if (that.cityBox)Vcity._m.addClass('hide', that.cityBox); if (that.ul)Vcity._m.addClass('hide', that.ul); if(that.myIframe)Vcity._m.addClass('hide',that.myIframe); }); div.className = 'citySelector'; div.style.position = 'absolute'; div.style.left = inputPos.left + 'px'; div.style.top = inputPos.bottom + 'px'; div.style.zIndex = 999999; // 判断是否IE6,如果是IE6需要添加iframe才能遮住SELECT框 var isIe = (document.all) "javascript:">' + oCity[key][sortKey[j]][i] + '</a>'; odda.push(str); } odd.innerHTML = odda.join(''); odl.appendChild(odt); odl.appendChild(odd); odiv.appendChild(odl); } // 移除热门城市的隐藏CSS Vcity._m.removeClass('hide',this.hot); this.hotCity.appendChild(odiv); } document.body.appendChild(this.rootDiv); /* IE6 */ this.changeIframe(); this.tabChange(); this.linkEvent(); }, /* * * tab按字母顺序切换 * @ tabChange * */ tabChange:function(){ var lis = Vcity._m.$('li',this.cityBox); var divs = Vcity._m.$('div',this.hotCity); var that = this; for(var i=0,n=lis.length;i<n;i++){ lis[i].index = i; lis[i].onclick = function(){ for(var j=0;j<n;j++){ Vcity._m.removeClass('on',lis[j]); Vcity._m.addClass('hide',divs[j]); } Vcity._m.addClass('on',this); Vcity._m.removeClass('hide',divs[this.index]); /* IE6 改变TAB的时候 改变Iframe 大小*/ that.changeIframe(); }; } }, /* * * 城市LINK事件 * @linkEvent * */ linkEvent:function(){ var links = Vcity._m.$('a',this.hotCity); var that = this; for(var i=0,n=links.length;i<n;i++){ links[i].onclick = function(){ that.input.value = this.innerHTML; Vcity._m.addClass('hide',that.cityBox); /* 点击城市名的时候隐藏myIframe */ Vcity._m.addClass('hide',that.myIframe); } } }, /* * * INPUT城市输入框事件 * @inputEvent * */ inputEvent:function(){ var that = this; Vcity._m.on(this.input,'click',function(event){ event = event || window.event; if(!that.cityBox){ that.createWarp(); }else if(!!that.cityBox && Vcity._m.hasClass('hide',that.cityBox)){ // slideul 不存在或者 slideul存在但是是隐藏的时候 两者不能共存 if(!that.ul || (that.ul && Vcity._m.hasClass('hide',that.ul))){ Vcity._m.removeClass('hide',that.cityBox); /* IE6 移除iframe 的hide 样式 */ //alert('click'); Vcity._m.removeClass('hide',that.myIframe); that.changeIframe(); } } }); Vcity._m.on(this.input,'focus',function(){ that.input.select(); if(that.input.value == '城市名') that.input.value = ''; }); Vcity._m.on(this.input,'blur',function(){ if(that.input.value == '') that.input.value = '城市名'; }); Vcity._m.on(this.input,'keyup',function(event){ event = event || window.event; var keycode = event.keyCode; Vcity._m.addClass('hide',that.cityBox); that.createUl(); /* 移除iframe 的hide 样式 */ Vcity._m.removeClass('hide',that.myIframe); // 下拉菜单显示的时候捕捉按键事件 if(that.ul && !Vcity._m.hasClass('hide',that.ul) && !that.isEmpty){ that.KeyboardEvent(event,keycode); } }); }, /* * * 生成下拉选择列表 * @ createUl * */ createUl:function () { //console.log('createUL'); var str; var value = Vcity._m.trim(this.input.value); // 当value不等于空的时候执行 if (value !== '') { var reg = new RegExp("^" + value + "|\\|" + value, 'gi'); var searchResult = []; for (var i = 0, n = Vcity.allCity.length; i < n; i++) { if (reg.test(Vcity.allCity[i])) { var match = Vcity.regEx.exec(Vcity.allCity[i]); if (searchResult.length !== 0) { str = '<li><b class="cityname">' + match[1] + '</b><b class="cityspell">' + match[2] + '</b></li>'; } else { str = '<li class="on"><b class="cityname">' + match[1] + '</b><b class="cityspell">' + match[2] + '</b></li>'; } searchResult.push(str); } } this.isEmpty = false; // 如果搜索数据为空 if (searchResult.length == 0) { this.isEmpty = true; str = '<li class="empty">对不起,没有找到数据 "<em>' + value + '</em>"</li>'; searchResult.push(str); } // 如果slideul不存在则添加ul if (!this.ul) { var ul = this.ul = document.createElement('ul'); ul.className = 'cityslide'; this.rootDiv && this.rootDiv.appendChild(ul); // 记录按键次数,方向键 this.count = 0; } else if (this.ul && Vcity._m.hasClass('hide', this.ul)) { this.count = 0; Vcity._m.removeClass('hide', this.ul); } this.ul.innerHTML = searchResult.join(''); /* IE6 */ this.changeIframe(); // 绑定Li事件 this.liEvent(); }else{ Vcity._m.addClass('hide',this.ul); Vcity._m.removeClass('hide',this.cityBox); Vcity._m.removeClass('hide',this.myIframe); this.changeIframe(); } }, /* IE6的改变遮罩SELECT 的 IFRAME尺寸大小 */ changeIframe:function(){ if(!this.isIE6)return; this.myIframe.style.width = this.rootDiv.offsetWidth + 'px'; this.myIframe.style.height = this.rootDiv.offsetHeight + 'px'; }, /* * * 特定键盘事件,上、下、Enter键 * @ KeyboardEvent * */ KeyboardEvent:function(event,keycode){ var lis = Vcity._m.$('li',this.ul); var len = lis.length; switch(keycode){ case 40: //向下箭头↓ this.count++; if(this.count > len-1) this.count = 0; for(var i=0;i<len;i++){ Vcity._m.removeClass('on',lis[i]); } Vcity._m.addClass('on',lis[this.count]); break; case 38: //向上箭头↑ this.count--; if(this.count<0) this.count = len-1; for(i=0;i<len;i++){ Vcity._m.removeClass('on',lis[i]); } Vcity._m.addClass('on',lis[this.count]); break; case 13: // enter键 this.input.value = Vcity.regExChiese.exec(lis[this.count].innerHTML)[0]; Vcity._m.addClass('hide',this.ul); Vcity._m.addClass('hide',this.ul); /* IE6 */ Vcity._m.addClass('hide',this.myIframe); break; default: break; } }, /* * * 下拉列表的li事件 * @ liEvent * */ liEvent:function(){ var that = this; var lis = Vcity._m.$('li',this.ul); for(var i = 0,n = lis.length;i < n;i++){ Vcity._m.on(lis[i],'click',function(event){ event = Vcity._m.getEvent(event); var target = Vcity._m.getTarget(event); that.input.value = Vcity.regExChiese.exec(target.innerHTML)[0]; Vcity._m.addClass('hide',that.ul); /* IE6 下拉菜单点击事件 */ Vcity._m.addClass('hide',that.myIframe); }); Vcity._m.on(lis[i],'mouseover',function(event){ event = Vcity._m.getEvent(event); var target = Vcity._m.getTarget(event); Vcity._m.addClass('on',target); }); Vcity._m.on(lis[i],'mouseout',function(event){ event = Vcity._m.getEvent(event); var target = Vcity._m.getTarget(event); Vcity._m.removeClass('on',target); }) } } };
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