/*!
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* js模拟系统select v1.0
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* http://www.cnblogs.com/typeof/
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*
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* 主流浏览器对html的select元素渲染都不一样，IE系列(6, 7, 8)也不一样，
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* firefox，chrome，safari，opera 渲染和事件处理也稍有差异
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* 该脚本解决了在不同浏览器下渲染和事件响应不一致的问题，对系统select是完全
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* 意义上的替换。v1.0版本只支持单个select选择即不支持二级或者三级联动且不支持系统select的onchange事件。
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* 该版本支持模拟select选择的数据和系统select选中数据的同步，不影响form表单的提交
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*
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* 如果page上select有的不想通过该脚本替换，只想维持系统select，可以在相应的select元素添加自定义属性data-enabled="true"，
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* 否则可以在想要通过该脚本替换的select元素上添加自定义属性data-enabled="false"或者不加，会默认为这个select需要
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* 通过该脚本进行替换
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*
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* 日期：2012-11-07 15:38
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*/
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(function(squid) {
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function JSelect() {
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this.init()
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}
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JSelect.prototype = {
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constructor: JSelect,
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init: function(context) {
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//获取指定上下文所有select元素
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var elems = squid.getElementsByTagName('select', context)
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this.globalEvent()
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this.initView(elems)
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},
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initView: function(elems) {
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var i = 0,
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elem,
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length = elems.length,
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enabled;
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for(; i < length; i++) {
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elem = elems[i]
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enabled = elem.getAttribute('data-enabled')
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//使用系统select
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if(!enabled || enabled === 'true')
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continue
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if(squid.isVisible(elem))
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elem.style.display = 'none'
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this.create(elem)
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}
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},
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create: function(elem) {
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var data = [],
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i = 0,
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length,
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option,
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options,
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value,
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text,
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obj,
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lis,
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ul,
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_default,
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icon,
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selectedText,
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selectedValue,
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div,
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wrapper,
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position,
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left,
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top,
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cssText;
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options = elem.getElementsByTagName('option')
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length = options.length
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for(; i < length; i++) {
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option = options[i]
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value = option.value
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text = option.innerText || option.textContent
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obj = {
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value: value,
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text: text
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}
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if(option.selected) {
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selectedValue = value
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selectedText = text
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obj['selected'] = true
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}
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data.push(obj)
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}
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lis = this.render(this.tmpl, data)
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ul = '<ul class="select-item">' + lis + '</ul>'
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//
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div = document.createElement('span')
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div.style.display = 'none'
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div.className = 'select-wrapper'
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//已选元素
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_default = document.createElement('span')
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_default.className = 'select-default unselectable'
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_default.unselectable = 'on'
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//让div元素能够获取焦点
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_default.setAttribute('tabindex', '1')
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_default.setAttribute('data-value', selectedValue)
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_default.setAttribute('hidefocus', true)
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_default.innerHTML = selectedText
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div.appendChild(_default)
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//选择icon
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icon = document.createElement('i')
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icon.className = 'select-icon'
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div.appendChild(icon)
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//下拉列表
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wrapper = document.createElement('span')
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wrapper.className = 'select-list hide'
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wrapper.innerHTML = ul
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//生成新的元素
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div.appendChild(wrapper)
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//插入到select元素后面
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elem.parentNode.insertBefore(div, null)
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//获取select元素left top值
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//先设置select显示，取完left, top值后重新隐藏
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elem.style.display = 'block'
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//事件绑定
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this.sysEvent(div)
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position = squid.position(elem)
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elem.style.display = 'none'
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left = position.left
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top = position.top
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cssText = ' display: inline-block;'
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div.style.cssText = cssText
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},
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globalEvent: function() {
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//document 添加click事件，用户处理每个jselect元素展开关闭
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var target,
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className,
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elem,
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wrapper,
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status,
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that = this;
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squid.on(document, 'click', function(event) {
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target = event.target,
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className = target.className;
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switch(className) {
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case 'select-icon':
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case 'select-default unselectable':
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elem = target.tagName.toLowerCase() === 'span' ? target : target.previousSibling
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wrapper = elem.nextSibling.nextSibling
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//firefox 鼠标右键会触发click事件
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//鼠标左键点击执行
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if(event.button === 0) {
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//初始化选中元素
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that.initSelected(elem)
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if(squid.isHidden(wrapper)) {
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status = 'inline-block'
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//关闭所有展开jselect
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that.closeSelect()
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}else{
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status = 'none'
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}
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wrapper.style.display = status
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elem.focus()
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}else if(event.button === 2){
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wrapper.style.display = 'none'
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}
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that.zIndex(wrapper)
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break
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case 'select-option':
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case 'select-option selected':
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if(event.button === 0) {
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that.fireSelected(target, target.parentNode.parentNode.previousSibling.previousSibling)
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wrapper.style.display = 'none'
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}
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break
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default:
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while(target && target.nodeType !== 9) {
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if(target.nodeType === 1) {
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if(target.className === 'select-wrapper') {
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return
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}
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}
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target = target.parentNode
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}
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that.closeSelect()
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break
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}
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})
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},
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sysEvent: function(elem) {
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var stand = elem.firstChild,
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dropdown = elem.lastChild,
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target,
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//firefox = 'MozBinding' in document.documentElement.style,
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chrome = /chrome/i.test(navigator.userAgent),
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keyup = chrome ? 'keypress' : 'keyup',
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that = this;
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squid.on(elem, 'mouseover', function(event) {
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if(!that.doScrolling) {
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target = event.target
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that.activate(target)
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}
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})
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squid.on(elem, 'mouseout', function(event) {
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if(!that.doScrolling) {
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target = event.target
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that.deactivate(target)
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}
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})
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squid.on(stand, 'keydown', function(event) {
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var keyCode = event.keyCode;
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switch(keyCode) {
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//回车选中
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case 13:
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that.enter(dropdown)
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break
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//向上键
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case 38:
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that.doScrolling = true
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that.up(dropdown)
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break
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//向下键
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case 40:
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that.doScrolling = true
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that.down(dropdown)
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break
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default:
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break
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}
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})
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squid.on(stand, keyup, function(event) {
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var keyCode = event.keyCode;
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switch(keyCode) {
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//回车选中
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case 13:
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that.doScrolling = false
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break
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//向上键
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case 38:
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that.doScrolling = false
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break
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//向下键
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case 40:
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that.doScrolling = false
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break
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default:
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break
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}
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})
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},
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zIndex: function(elem) {
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var index = 10,
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cur = elem.parentNode.parentNode,
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next = squid.next(cur);
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if(next) {
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cur.style.zIndex = index
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next.style.zIndex = --index
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}
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},
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initSelected: function(elem) {
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var curText = elem.innerText || elem.textContent,
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curValue = elem.getAttribute('data-value'),
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wrapper = elem.nextSibling.nextSibling,
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n = wrapper.firstChild.firstChild,
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text,
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value,
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dir,
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min = 0,
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max,
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hidden = false;
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for(; n; n = n.nextSibling) {
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text = n.innerText || n.textContent
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value = n.getAttribute('data-value')
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if(curText === text && curValue === value) {
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//显示已选中元素
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if(squid.isHidden(wrapper)) {
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wrapper.style.display = 'block'
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hidden = true
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}
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max = wrapper.scrollHeight
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if(n.offsetTop > (max / 2)) {
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if(wrapper.clientHeight + wrapper.scrollTop === max)
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dir = 'up'
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else
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dir = 'down'
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}else{
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if(wrapper.scrollTop === min)
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dir = 'down'
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else
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dir = 'up'
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}
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this.inView(n, wrapper, dir)
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if(hidden)
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wrapper.style.display = 'none'
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this.activate(n)
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break
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}
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}
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},
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activate: function(elem) {
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var tagName = (elem.tagName || '').toLowerCase(),
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className = elem.className,
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parent = elem.parentNode,
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first = parent.firstChild,
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last = parent.lastChild;
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switch(tagName) {
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case 'li':
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//li.select-option 元素
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if(!~className.indexOf('selected') && (elem !== first || elem !== last)) {
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this.deactivate(elem)
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elem.className = className + ' selected'
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}
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break
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default:
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break
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}
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},
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deactivate: function(elem) {
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var tagName = (elem.tagName || '').toLowerCase(),
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className = (' ' + elem.className + ' ').replace(/[\n\r\t]/, '');
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switch(tagName) {
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case 'li':
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//li.select-option 元素
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var i = 0,
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lis = squid.siblings(elem),
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length = lis.length,
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cur;
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for(; i < length; i++) {
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cur = lis[i]
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cur.className = squid.trim(className.replace(' selected ', ''))
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}
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break
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default:
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break
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}
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},
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fireSelected: function(elem, s) {
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var text = elem.innerText || elem.textContent,
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value = elem.getAttribute('data-value'),
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r;
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s.setAttribute('data-value', value)
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if(s.innerText)
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s.innerText = text
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else
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s.textContent = text
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//触发系统select选中，用于form表单提交
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r = s.parentNode.previousSibling.previousSibling
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r.value = value
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r.setAttribute('data-text', text)
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},
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closeSelect: function() {
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var elems = squid.getElementsByClassName('select-list'),
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i = 0,
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length = elems.length,
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elem;
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for(; i < length; i++) {
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elem = elems[i]
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if(squid.isVisible(elem))
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elem.style.display = 'none'
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}
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},
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up: function(elem) {
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var ul = elem.firstChild,
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lis = ul.childNodes,
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li = this.getSelectedIndex(lis),
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cur,
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i = li.index;
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if(i > 0) {
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i--
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cur = lis[i]
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//判断元素是否in view
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this.inView(cur, elem, 'up')
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this.activate(cur)
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this.fireSelected(cur, elem.previousSibling.previousSibling)
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}
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},
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down: function(elem) {
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var ul = elem.firstChild,
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lis = ul.childNodes,
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li = this.getSelectedIndex(lis),
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cur,
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i = li.index;
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if(i < lis.length - 1) {
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i++
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cur = lis[i]
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//判断元素是否in view
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this.inView(cur, elem, 'down')
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this.activate(cur)
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this.fireSelected(cur, elem.previousSibling.previousSibling)
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}
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},
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enter: function(elem) {
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var ul = elem.firstChild,
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lis = ul.childNodes,
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li,
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i,
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cur;
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li = this.getSelectedIndex(lis)
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i = li.index
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cur = lis[i]
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this.fireSelected(cur, elem.previousSibling.previousSibling)
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this.closeSelect()
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},
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getSelectedIndex: function(elems) {
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var i = 0,
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length = elems.length,
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elem;
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for(; i < length; i++) {
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elem = elems[i]
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if(~elem.className.indexOf('selected')) {
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return {
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index: i
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}
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}
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}
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return {
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index: -1
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}
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},
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inView: function(elem, wrapper, dir) {
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var scrollTop = wrapper.scrollTop,
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offsetTop = elem.offsetTop,
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top;
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if(dir === 'up') {
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if(offsetTop === 0) {
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wrapper.scrollTop = offsetTop;
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}else if(offsetTop < scrollTop) {
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top = offsetTop - scrollTop
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this.scrollInView(wrapper, top)
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}
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}else{
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var clientHeight = wrapper.clientHeight;
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if(offsetTop + elem.offsetHeight === wrapper.scrollHeight) {
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wrapper.scrollTop = wrapper.scrollHeight - wrapper.clientHeight
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}else if(offsetTop + elem.offsetHeight > clientHeight + scrollTop) {
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top = (offsetTop + elem.offsetHeight) - (scrollTop + clientHeight)
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this.scrollInView(wrapper, top)
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}
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}
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},
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scrollInView: function(elem, top) {
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setTimeout(function() {
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elem.scrollTop += top
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}, 10)
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},
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doScrolling: false,
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render: function(tmpl, data) {
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var i = 0,
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cur,
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length = data.length,
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prop,
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value,
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item,
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r = [];
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for(; i < length; i++) {
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cur = data[i]
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item = tmpl.replace(/\{\{\w+\}\}/g, function(a) {
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prop = a.replace(/[\{\}]+/g, '')
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value = cur[prop] || ''
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if(prop === 'class') {
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value += 'select-option'
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if(cur.selected) {
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value += ' selected'
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}
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}
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return value
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})
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r.push(item)
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}
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return r.join('')
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},
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tmpl: '<li class="{{class}}" data-value="{{value}}">{{text}}</li>'
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}
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squid.swing.jselect = function() {
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return new JSelect()
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}
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})(squid);
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