闲话少聊,今天本人重点看了看jquery插件开发这一块。想通过代码,实际练下兵。当然,也是为了解决项目的实际需要。平时,我们经常遭遇"选择框"这个控件。 平时,如果我们的选择项非常简单, 一般用浏览器自带的select 就OK了。但是如果字典项直接存在上下级关系,也就是经常见到的树结构 ,那就非常非常难受了。自己很纳闷,为什么jquery插件千千万,为什么就没有这么一款插件呢,一般就是纯粹的树插件, 要不就是下拉框插件。总之,个人没有找到满足自己要求的插件。那就自己就着手写一个吧。
先亮底牌,展示效果。
 
 
主要有两种效果:
第一种:对于数据一般情况, 用浏览器的select 标签也可,主要是可以解决自身select标签的样式.重点是在美化,使用一些标签进行仿真 select标签;
第二种:也就是重点, 下拉选择树。 下拉列表中显示树结构
 
实现方式
   其实这个插件,自己只负责组装。意思就是:这两种效果自己都参照了其他jquery插件,个人只是把两者合并了一下。
因为个人对美工这一块的干活,一直都是远观的状态。
使用的两个插件分别是:
ztree.3.5
jquery.mfs

实现代码(droptree.js)
 
/**
下拉树
*/

(function($){
  var defaults={    
    idLabel:"code",
    textLabel:"name",
    pidLabel:"pid",    
    transition:"ztree",
    items:[]
  };
/**
  target:input element;
    
*/

function DropTree(target,options){    
    this.target = target;
    this.value = target.value;
                this.$target = $(target);
    this.opts = $.extend({}, defaults, options, this.$target.data());
    this.id = this.target.id || this.target.name;    
    if(this.$target.length >0){
        this._init();
    }
    return this;
}

DropTree.prototype._init = function(){
    var self = this;    
    this.$target.hide();
    this.$wrap = this.$target.wrap('<div class="mfs-container">').parent();    
    this.$selected = $('<a class="mfs-selected-option" href="#" />').prependTo(this.$wrap);
    
    //this.$selected.css("height",15);
    this.$selected.html(this.value+" ");
    this.$down = $("<span> </span>").prependTo(this.$selected);    
    this.transition = Transitions[this.opts.transition].call(this);
    
};


var Transitions = {
  mfs:function(){    
    var mfsId = this.id+"_mfs";
    this.$options = $('<ul class="mfs-options" id="'+mfsId+'"/>').insertAfter(this.$selected);
    var idLabel = this.opts.idLabel;
    var textLabel = this.opts.textLabel;
    var $options = this.$options;    
    //var (this.id);
    $.each(this.opts.items,function(i,n){
        var $op = $('<a href="#" index="'+i+'">'+n[textLabel]+'</a>').wrap('<li class="mfs-option">').parent();        
        $options.prepend($op);
    });    
        
    //添加活力
    var enableMagic = function (theContainer){
        
        //TODO 可配置
        var selectElm = theContainer.find('select');
        var selectElmOptions = selectElm.find('option');
        var optionList = theContainer.find('#'+mfsId);
        var optionListLi = optionList.find('li.mfs-option');
        var selectedOption = theContainer.find('a.mfs-selected-option');
        var optionListOptions = optionList.find('a');
        
        optionList.hide();
        optionListOptions.click(function(){                    
          optionListLi.removeClass('active').removeClass('selected');
          $(this).closest('li').addClass('selected');
          selectedOption.html($(this).text()+'<span> </span>');
          selectElmOptions.removeAttr('selected');
          selectElmOptions.eq($(this).attr('index')).prop('selected', 'selected');
          optionList.hide();
            
          // Make a refresh function that just updates the select magic (destroy and re-enable)
          if (selectElm.selectedIndex != $(this).attr('index') && selectElm.onchange) {    
            selectElm.selectedIndex = $(this).attr('index');
            selectElm.onchange();    
          }
          if (selectElm.selectedIndex != $(this).attr('index')) {
            selectElm.selectedIndex = $(this).attr('index');
            selectElm.trigger('change');
          }
        
          return false;
        });
    
        selectedOption.click(function(){
                    
          var optionListAll = $('#'+mfsId);
          if (optionList.is(':visible')) {
            optionList.hide();
            mfsSelectOpen = true;
          }
          else {
            optionListLi.removeClass('active');
            optionListAll.hide();
            optionList.show();
            var optionListSelected = optionList.find('li.mfs-option.selected');
            if (optionListSelected.length > 0) {
              optionListSelected.addClass('active');
            }
            else {
              optionList.find('li.mfs-option:first-child').addClass('active');
            }
            mfsSelectOpen = optionList;
          }
          $(this).blur();
          return false;
        });
    
        optionListLi.mouseover(function(){
          optionListLi.removeClass('active');
          $(this).addClass('active');
        });
    }; //end enableMagic    
    
    enableMagic(this.$wrap);
  },
    
  ztree:function(){
    var treeId = this.id+"_tree";
        //<ul id="treeDemo" class="ztree"></ul>
    this.$options = $('<ul id="'+treeId+'" class="mfs-options ztree">').insertAfter(this.$selected);        
    var theContainer = this.$wrap;
    var optionList = theContainer.find('#'+treeId);
    var selectedOption = theContainer.find('a.mfs-selected-option');
    var srcElem = this.target;
    var idLabel = this.opts.idLabel;    
    var    zTreeOnClick= function(event, treeId, treeNode) {            
      selectedOption.html(treeNode.name+'<span> </span>');//span 为下拉箭头占位符
      srcElem.value=treeNode[idLabel];
      optionList.hide();
    };
    
    var setting = {
      data: {
        simpleData: {
          enable: true,
          idKey: this.opts.idLabel,
          pIdKey: this.opts.pidLabel
        }
      },
      callback: {
        onClick: zTreeOnClick        
      }        
    };
    
    this.oper = $.fn.zTree.init($("#"+treeId), setting,this.opts.items);    
    //设置默认值
    var nodes = this.oper.getNodesByParam(idLabel, this.value, null);
    if(nodes.length>0){
      var nodeName = (nodes[0])[this.opts.textLabel];    
      selectedOption.html(nodeName+'<span> </span>');//span 为下拉箭头占位符
      this.oper.selectNode(nodes[0],true);
    }
    var enableMagic = function (theContainer){        
        var selectedOption = theContainer.find('a.mfs-selected-option');        
        optionList.hide();
        selectedOption.click(function(){                                
          if (optionList.is(':visible')) {
            optionList.hide();            
          }
          else {
            optionList.show();
          }
          $(this).blur();
          return false;
        });        
    }//end enableMagic
    enableMagic(this.$wrap);
  }
    
};

$.fn.droptree = function(options){
  return    this.each(function(){
         if(!$.data(this,'droptree')){
            $.data(this,'droptree',new DropTree(this,options));
         }                
      });
};
    
})(jQuery)
 
整合点在:Transitions 对象。明眼人一眼就看出来了:该对象提供两个方法:
mfs: 主要参照mfs 插件,构建下拉列表的内容
ztree: 借助ztree 构建 下拉列表树
当然, 没用过ztree的盆友,也可以用其他的tree 插件。当然,那要自己在Transitions 添加了。 总之,跳跳大路通罗马

 
html 使用
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript" src="jquery-1.9.1.min.js"></script>
<script type="text/javascript" src="jquery.ztree.all-3.5.js"></script>
<script type="text/javascript" src="droptree.js"></script>
<link href="droptree_style.css" rel="stylesheet" />
<link href="zTreeStyle/zTreeStyle.css" rel="stylesheet" />
</head>
<script type="text/javascript">
$(document).ready(function(){
    $("#simple-select").droptree({
  transition:'mfs',
  items:[{code:'man',name:'男人'},
         {code:'woman',name:'女人'},
         {code:'yao',name:'人妖'}
        ]}        
        );

    
    $("#simple_input").droptree({items:[
    {code:'root',name:'根节点',pid:-1},
    {code:'man',name:'男装',pid:'root'},
    {code:'woman',name:'女装',pid:'root'},
    {code:'man1',name:'男装1',pid:'man'},
    {code:'man2',name:'男装2',pid:'man'},
    {code:'woman1',name:'女装1',pid:'woman'}
    ],
    transition:"ztree"
    });
});
    
</script>
</head>
<body>

  <div class="wrap" style="width:600px; margin:0 auto; margin-top:200px">
    <div style="width:60px;float:left">    
      <select id="simple-select" name="simple-select">
              <option value="opt1">option 1</option>
              <option value="opt2">option 2</option>
              <option value="opt3" selected="selected">option 3</option>
      </select>
    </div>
    
    <div style="float:right">
        <input type="text" name="simple_input"    id="simple_input" value="man2"/>    
    </div>
    
  </div>
</body>
</html>
 
还有一点要注意:适合使用该插件的组件,是form 元素:如input/select|  其他元素使用不合适。
想一想,我们使用下拉选择树,就是获取选择值的,传到后台处理的。如果为radio、checkbox使用了。
 那就不是下拉系列了.呵呵。 如果为textarea, 也未尝不可,我只能用赵本山小品一句话,回答阁下:[我看你是,没事吃饱撑着的型]
当然 需要完善的地方也有很多:
如:
1.ajax 支持
2.多选支持
=========================================================
接下来, 应该可以进一步封装下,封装成jsp 标签。 剩下的就是时间问题了