/**
 * Double校验组件
 * js组件：DoubleObj.js
 * 应用例子：Double.html
 * 属性：
 *       precision： 精度。
 * 说明：1、允许输入0－9数字，“.”  “-”，并且对输入进行了限制。 
 *       2、将Enter 键转换为 Tab 键。  
 * @author  lixiangyu@neusoft.com,2003.04
 *          micy@neusoft.com	2003.07.19
 *				hugh@neusoft.com
 */
 
 
 
 function DoubleObj(editerObj){
     
 	//定义输入对象
 	this.edtObj = editerObj;
 	
    	
    	//公共方法
    	this.onvalidate = DOU_onvalidate;
    	this.checkSymbol = DOU_checkSymbol;
    	this.getParentObj = DOU_getParentObj;
    	this.getBaseObj = DOU_getBaseObj;
    	
 		this.onReady = DOU_onReady;
 		this.eventBand = DOU_eventBand;
    	this.OnlyNumber = DOU_OnlyNumber; 
        this.dealInputOnblur = DOU_dealInputOnblur;	
 	
 	//私有方法
 	    this.addZero = DOU_addZero;
        this.deleteZero = DOU_deleteZero;       
 	//私有对象
    	var ParObj=null;
 		var BasObj=null;
 }

   function DOU_getParentObj(){  
	if(this.ParObj==null){
		this.ParObj = new NumberObj(this.edtObj);
		}
		return this.ParObj;
    }
    
   function DOU_getBaseObj(){  
		if(this.BasObj==null){
			this.BasObj = this.getParentObj().getBaseObj();
			}
			return this.BasObj;
   }

    function DOU_onvalidate() {
     
      //调用Base.htc中的公用函数检查数据合法性
        //if(!commonCheck())	return false;
     	if(!this.getBaseObj().commonCheck())	return false;
	  
	  if(!this.checkSymbol()){
		    alert(this.edtObj.prompt + "输入不合法！");
		   return false;
	  }		  
	//检查小数点后精度是否符合
	 if(!isNaN(this.edtObj.precision)){

      var n = this.edtObj.value.indexOf(".");
      var m=this.edtObj.value.length-1;
      var z=m-n;
      precision = parseInt(this.edtObj.precision);
      if(!isNaN(precision)){
	      if((m-n)!= precision){
	         alert(this.edtObj.prompt+"精度不符，要求精度"+this.edtObj.precision+"位。");
		     return false;
	    
	      }        
      }
	   
	}
      return true;
      
    }
    
    
    function DOU_OnlyNumber()
    {         
         //this.cursorDispose(this.edtObj);         
         if(!CursorDispose(this.edtObj,this.edtObj.precision))
             window.event.keyCode = 0;         
         //this.checkSymbol();
         
        //如果已经输入一个小数点，则禁止再次输入小数点。并且小数点不能输入在第一位
       /* var n = this.edtObj.value.indexOf(".");
        if(n>-1){
          if(window.event.keyCode == 46)
              window.event.keyCode = 0 ; 
              
          //小数点后超过精度限制则禁止输入
         var m=this.edtObj.value.length;
          precision = parseInt(this.edtObj.precision);
          if((m-n)>precision){
           window.event.keyCode = 0 ;
        
          }        
        
        }*/
         
         //限制输入长度，超长禁止输入
       var fixLength = this.edtObj.fixLength;
        var inputLen = this.edtObj.value.length;
        if(!isNaN(fixLength)){
	         fixLength = parseInt(fixLength);
	         if(inputLen < fixLength)
	             event.returnValue = true;
	         else if(inputLen > fixLength-1)
	             event.returnValue = false;
	    }
         
         
         if ( !(((window.event.keyCode >= 48) && (window.event.keyCode <= 57))|| (window.event.keyCode == 13) || (window.event.keyCode == 46)|| (window.event.keyCode == 45)))
         {
           window.event.keyCode = 0 ;
          }
      
    } 



 /**
 *名称：DOU_checkSymbol()
 *功能：检查符号“.”和“－”输入的合法性
 */
   function DOU_checkSymbol(){
     var checkStr = this.edtObj.value; 
     var j=0;
     var flag=0;   
     //第一位不允许输入小数点“.”
     if(checkStr == null || checkStr=="" ){
        if(window.event.keyCode == 46)
            window.event.keyCode = 0 ; 
               
     }  
     //如果第一位是负号，第二位禁止输入“.”  
     if(checkStr=="-"){
       if(window.event.keyCode == 46)
               window.event.keyCode = 0 ; 
     }
    
     //如果第一位输入负号，其他位不允许输入负号“-”
     if(checkStr.indexOf("-")>-1 || checkStr.length>1){
       if(window.event.keyCode == 45)
              window.event.keyCode = 0 ; 
     }
     
    for (var i = 0; i < checkStr.length; i++) {
           var oneChar = checkStr.charAt(i)
           
           //第一位可以是负号
           if(i == 0 && oneChar == "-"){
              continue;
           }
     
           if ( i>0 && oneChar == "-") {
          //  alert("负号输入不合法");
            event.returnValue = false;
            return false;
           }
           
           if (oneChar < "0" || oneChar > "9") {
              if(oneChar != "-" && oneChar != ".")
                return false;
           }
       }
         
        return true; 
   }  

	function DOU_onReady(){
		//调用ParentObj 的初始化方法   	 
    	 this.getParentObj().onReady();
    	 }
	function DOU_eventBand(){
		this.getBaseObj().eventBand("onkeypress","OnlyNumber()")
		}
    function DOU_dealInputOnblur(){
       var value = this.edtObj.value==""?"0":this.edtObj.value;
       if(value=="-") value = "-0";
       var precision = this.edtObj.precision;
       if(value.indexOf(".")<0){
          this.edtObj.value = this.deleteZero(value+".") + this.addZero(parseInt(precision));
       }
       else{
          if(value.charAt(0)==".") value = "0" + value;
          var leftPrec = parseInt(precision)-(value.length-value.indexOf(".")-1);
          value = value + this.addZero(leftPrec);
          value = value.substring(0,value.indexOf(".")+parseInt(precision)+1); //制动截掉不是精确位
          this.edtObj.value = this.deleteZero(value);
       }
    }
    function DOU_addZero(num)
    {
       var prec = "";
       for(var i=0;i<num;i++){
         prec+= "0";
       }
       return prec; 
    }
    function DOU_deleteZero(str)
    {       
       var i = 0;
       var str1 = str;
       for(;i<str1.length;i++){
          
          if(str.indexOf("0")==0&&str.indexOf(".")>1){
             str = str.substr(1);
          }
          else if(str.indexOf("-")==0&&str.indexOf("0")==1&&str.indexOf(".")>2){
             str = "-" + str.substr(2);
          }
          else if(str.indexOf("-")==0&&str.indexOf(".")==1){
             str = "-0" + str.substr(1); 
             break;
          }
          else{
             break;
          }          
       }
       return str;
    }