验证js

//***JavaScript 表单域读写函数集*******//

function outcheck(check_value){
 if(check_value != ""){
  alert(check_value)
  return false;
 }
 return true;
}

function checkvalue(obj, low, up, mode, lable){
/*
Mode = 1 检测是否为空   2是否是数字  4是否整数
8是否是为数字、字母和_.-
16 自定义字符检测
32 长度检测
64 数字大小检测
*/
    var temp,type;
    var length, i, base, str;
   
    str=getformvalue(obj);
    if(str==null){
  lenght=0;
  str="";
 } 
 else{ 
  length = str.length
 } 
    temp=""
    if( mode % 2 >= 1 ){
        if( str == "" ){
            temp = temp + "“" + lable + "”" + "不能为空！" + "\n";
        }
    }
   
    if( mode % 4 >= 2 ){
        base = "0123456789."
        for(i = 0;i<=length-1;i++)
            if( base.indexOf(str.substring(i, i+1)) == -1  ){
    temp = temp + "“" + lable + "”" + "必需是数字！" + "\n";
    break;
            }   
    }
   
    if( mode % 8 >= 4 ){
        base = "0123456789"
        for(i = 0;i<=length-1;i++)
            if( base.indexOf(str.substring(i, i+1)) == -1  ){
                temp = temp + "“" + lable + "”" + "必需是整数！" + "\n";
                break;
            }   
    }
   
    if( mode % 16 >= 8 ){
        base = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789_-."
        for(i = 0;i<=length-1;i++)
            if( base.indexOf(str.substring(i, i+1)) == -1  ){
                temp = temp + "“" + lable + "”" + "包含非法字符！它只能是字母、数字和“- _ .”。" + "\n";
                break;
            }
    }
   
    if( mode % 32 >= 16 ){
        base = low.replace("[a-z]", "abcdefghijklmnopqrstuvwxyz")
        base = base.replace("[a-z]", "abcdefghijklmnopqrstuvwxyz")
        base = base.replace( "[0-9]", "0123456789")
        for(i = 0;i<=length-1;i++)
            if( base.indexOf(str.substring(i, i+1)) == -1 ){
                temp = temp + "“" + lable + "”" + "包含非法字符！它只能是" + up + "。" + "\n";
                break;
            }
    }
   
    if( mode % 64 >= 32 ){
        if( ! (length >= low && length <= up) ){
               temp = temp + "“" + lable + "”" + "的长度必需在" + low + "到" + up + "之间！" + "\n";
        }
    }
   
     if( mode % 128 >= 64 ){
        if( ! (parseInt(str) >= parseInt(low) && parseInt(str) <= parseInt(up)) ){
               temp = temp + "“" + lable + "”" + "必需在" + low + "到" + up + "之间！" + "\n";
        }

    }
    if(temp!=""){
     alert(temp);
     type=(getformtype(obj));
     if(type!="radio" && type!="checkbox"){
      obj.focus();
     }
 return false;
   }
   return true;
   
}

function getformtype(obj){
 var type;
 type=obj.type;
 if(typeof(type)=="undefined"){

  type=obj[0].type;
 }
 return type;  
}
function getformvalue(input){
//取表单域的值
 var type,temp;
 temp="";
 
 type=getformtype(input); 

 switch(type){
  case "radio": //单选框
   n=input.length-1;

   if(isNaN(n)==true){
    if(input.checked == true){
     temp = input.value;
    }else{
     temp = "";
    } 
   }else{
    for(i=0;i<=n;i++){
     if(input[i].checked == true){
      return(input[i].value);
     }
    }
    break;
   }
   case "checkbox": //复选框
   n=input.length-1;
   if(isNaN(n)==true){
    if(input.checked == true){
     temp = input.value;
    }else{
     temp = "";
    } 
   }else{
    for(i=0;i<=n;i++){
     if(input[i].checked == true){
      if(temp!=""){
       temp += ",";
      }
      temp += input[i].value;

     } 
    }
   }
   return(temp);
   break;
   
  case "select-one" : //单选列表框
   n=input.length-1; 
   for(i=0;i<=n;i++){
    if(input.options[i].selected == true){
     temp = input.options[i].value;
     break;
    }   
   }
   return(temp);
   break;    
  case "select-multiple": //多选列表框
   n=input.length-1; 
   for(i=0;i<=n;i++){
    if(input.options[i].selected == true){
     if(temp!=""){
      temp+=",";
     }     
     temp+=input.options[i].value;
    }   
   }
   return(temp);
   break;   
  default:    //其它
   return(input.value);
   break;
 
 }
 
 return(input.value);

}

function ischecked(group,value){
 var i,n;
 n=group.length-1;
 for(i=0;i<=n;i++){
  if(value==group[i]){
   return true;   
  }
 }
 return false;
}

function SetSelectedAndChecked(input,value){
//设置表单域的选择
 var type,temp,i,n;
 var split_value = new Array();
 temp="";
 
 type=input.type;
 
 if(typeof(type)=="undefined"){
  type=input[0].type;
 }
 

 switch(type){
  case "radio": //单选框
   n=input.length-1;

   if(isNaN(n)==true){
    if(input.value = value){
     input.checked = true;
    }else{
     input.checked = false;
    } 
   }else{
    for(i=0;i<=n;i++){
     if(input[i].value == value){
      input[i].checked = true;
     }else{
      input[i].checked = false;     
     }
    }
   }
   break;

  case "checkbox": //复选框
   n=input.length-1;
   split_value=value.split(",");
   if(isNaN(n)==true){
    if(ischecked(split_value,input.value)){
     input.checked = true;
    }else{
     input.checked = false;
    } 
   }else{
    for(i=0;i<=n;i++){
     if(ischecked(split_value,input[i].value)){
      input[i].checked = true;
     }else{
      input[i].checked = false;     
     }     
    }
    
   }
   break;
   
  case "select-one" : //单选列表框
   n=input.options.length-1; 
   for(i=0;i<=n;i++){
    if(input.options[i].value == value){
     input.options[i].selected = true;
    }else{
     input.options[i].selected = false;    
    }
      
   }
   break;    
  case "select-multiple": //多选列表框
   n=input.options.length-1; 
   split_value=value.split(",");
   for(i=0;i<=n;i++){
    if(ischecked(split_value,input.options[i].value)){
      input.options[i].selected = true;
    }else{
      input.options[i].selected = false;    
    }   
   }
   break;   
  default:    //其它
   return false;
   break;
 
 }
 
 return true;

}