常用的脚本验证

图片上传

if(document.getElementById("radio1").checked==true&&document.getElementById("fileName").value=="")
  {
    alert("注意：你选择了上传图片，但是没有加载！");
    return false;
  }
  var fileName="                         "+document.form1.voucherFile.value;
  fileName=fileName.substring(fileName.length-4,fileName.length);
  if((document.getElementById("radio1").checked==true)&&(document.getElementById("fileName").value!="")&&(fileName.toUpperCase().indexOf(".JPG")==-1)&&(fileName.toUpperCase().indexOf(".BMP")==-1)&&(fileName.toUpperCase().indexOf(".GIF")==-1))
  {
    alert("请上传以JPG，BMP，GIF为结尾的文件!!");
    salebusinessform.voucherFile.focus();
    return false;
  }

 

<!--Start-->
  //禁用鼠标右键
  tmp=navigator.appVersion.toString();
  IE=parseFloat(tmp.substring(tmp.indexOf("MSIE")+4,tmp.length));
  function NC_rightclick(e)
  {
    if(e.button==2 || (e.button==0 && e.type=="contextmenu"))
    {
      document.getElementById('just_hide_it').style.left=e.clientX-14;
      document.getElementById('just_hide_it').style.top=e.clientY-14;
      return false;
    }
  }
  if(IE)
    document.oncontextmenu=Function("return false;");
  else
  {
    document.write('<div id="just_hide_it" style="z-index:-1;position:absolute;left:100;top:0;overflow:scroll;width:28;height:28;"></div>');
    document.oncontextmenu=NC_rightclick;
    document.onmousedown=NC_rightclick;
  }

  //判断日期是否有效
  function isDate(datestr)
  {
    var lthdatestr
    if (datestr != "")
      lthdatestr= datestr.length ;
    else
      lthdatestr=0;
    var tmpy="";
    var tmpm="";
    var tmpd="";
    var status;
    status=0;
    if ( lthdatestr== 0)
      return false

    for (i=0;i<lthdatestr;i++)
    {
      if (datestr.charAt(i)== '-')
      {
        status++;
      }
      if (status>2)
      {
        return false;
      }
      if ((status==0) && (datestr.charAt(i)!='-'))
      {
        tmpy=tmpy+datestr.charAt(i)
      }
      if ((status==1) && (datestr.charAt(i)!='-'))
      {
        tmpm=tmpm+datestr.charAt(i)
      }
      if ((status==2) && (datestr.charAt(i)!='-'))
      {
         tmpd=tmpd+datestr.charAt(i)
      }
    }
    year = new String (tmpy);
    month = new String (tmpm);
    day = new String (tmpd)
    if ((tmpy.length!=4) || (tmpm.length>2) || (tmpd.length>2))
    {
      return false;
    }
    if (!((1<=month) && (12>=month) && (31>=day) && (1<=day)) )
    {
      return false;
    }
    if (!((year % 4)==0) && (month==2) && (day==29))
    {
      return false;
    }
    if ((month<=7) && ((month % 2)==0) && (day>=31))
    {
      return false;
    }
    if ((month>=8) && ((month % 2)==1) && (day>=31))
    {
      return false;
    }
    if ((month==2) && (day==30))
    {
      return false;
    }
    return true;
  }

//判断是否为空函数
  function isEmpty(s) {
     return ((s == null) || (s.length == 0));
 }

//检测非法字符函数
 function isWhitespace (s) {
  var whitespace = " /t/n/r%<>///<>&*_?[]{}/'/":; ";
  if (isEmpty(s)) return true;
  var i;
  for (i = 0; i < s.length; i++)
  {
   var c = s.charAt(i);
   if (whitespace.indexOf(c) != -1)
      continue;
   else
     return false;
  }
  return true;
 }
//验证Email函数
 function isEmail(s) {
  // there must be >= 1 character before @, so we
  // start looking at character position 1
  // (i.e. second character)
  var i = 1;
  var sLength = s.length;

  // look for @
  while ((i < sLength) && (s.charAt(i) != "@"))
  {
   i++;
  }

  if ((i >= sLength) || (s.charAt(i) != "@")) return false;
  else i += 2;

  // look for .
  while ((i < sLength) && (s.charAt(i) != "."))
  {
   i++;
  }

  // there must be at least one character after the .
  if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
  else return true;
 }
//判断数字函数
 function isNumber(s)
 {
  var digits = "0123456789";
  var i = 0;
  var sLength = s.length;
  while ((i < sLength))
  {
   var c = s.charAt(i);
   if (digits.indexOf(c) == -1) return false;
   i++;
  }
  return true;
 }
//得到金额的长度
        function doublelength(theField,n,s)
 {
          var ss=theField.value;
          var num=ss.length;

          if(ss<0){
            return 0;;
          }
          if(ss.indexOf(".")==-1){
            num=num+3;
          }
          if(ss.indexOf(".")!=-1){
            if(ss.substring(ss.indexOf("."),ss.length).length<3){
              num=ss.indexOf(".")+3;
            }
          }
          if(num>n){
            return warnInvalid (theField, s);
          }
          return true;

        }
//判断是否是金额
        function isDouble(theField,s)
 {
          var ss=theField.value;
          if(ss<0){
            return warnInvalid (theField, s);
          }
          if(isNaN(parseFloat(ss))){
            return warnInvalid (theField, s);
          }
          else{
            if(parseFloat(ss)!=ss){
              return warnInvalid (theField, s);
            }
          }
          return true;
        }
 /*function isDouble(theField,s)
 {
                var ss=theField.value;
  var digits = "0123456789.";
  var i = 0;
                var j = 0;
  var sLength = ss.length;
                if (!isNumber(theField.value))
                {
                  while ((i < sLength))
    {
   var c = ss.charAt(i);
   if (digits.indexOf(c) == -1)
                          return warnInvalid (theField, s);
                        else{
                          if (c=='.'){
                          j++;
                          }
                            if(j>2&&ss.substring(ss.lastIndexOf('.'),ss.length).length!=2&&ss.lastIndexOf('.')==0){
                            return warnInvalid (theField, s);
                          }
                        }

   i++;
    }
                }
  return true;
 }*/
//提示空字符
 function warnEmpty (theField, s)
 {  alert(s);
     theField.focus();
  return false;
 }

//提示无效输入
 function warnInvalid (theField, s)
 { alert(s);
     theField.focus();
  theField.select();
  return false;
 }
//检测非法字符
 function checkString (theField,s)
 {   // Make sure the field exists before completing the test
  if (theField == null) return true;
  if (isWhitespace(theField.value))
     return warnEmpty (theField, s);
  else return true;
 }
//检测日期
 function checkDate(theField,s)
 {
  if (!isDate(theField.value))
   return warnInvalid (theField, s);
  else return true;
 }
//检测Email
 function checkEmail (theField,s)
 {
  if (!isEmail(theField.value))
     return warnInvalid (theField, s);
  else return true;
 }
//检测下拉框
 function checkSelect(theSelect,s)
 {
  if (theSelect.options[theSelect.selectedIndex].value != "-1" && theSelect.options[theSelect.selectedIndex].value != "") return true;
  else
  {
   theSelect.focus();
   warnEmpty(theSelect,s);
   return false;
  }
 }
//检测是否是数字
 function checkNumber (theField,s)
 {
  if (!isNumber(theField.value)) return false;
  if (isWhitespace(theField.value))
     return warnEmpty (theField, s);
  else return true;
 }
//检测邮编函数
 function checkzip (theField,s)
 {
  var ss=theField.value;
  var digits = "0123456789";
  var i = 0;
  var sLength = ss.length;
  if(sLength<6)
      return warnInvalid (theField, s);
  while ((i < sLength))
  {
   var c = ss.charAt(i);
   if (digits.indexOf(c) == -1)
     return warnInvalid (theField, s);
   i++;
  }

  return true;
 }
//验证区号
        function checkArea(theField)
 {
  if (theField.value.length < 3)
  {
   alert("请输入区号");
   theField.focus();
   return false;
  }
  else return true;
 }
//检测电话号码
 function checkPhone(theField,s)
 {
  var ss=theField.value;
  var digits = "0123456789- ";
  var i = 0;
  var sLength = ss.length;

  while ((i < sLength))
  {
   var c = ss.charAt(i);
   if (digits.indexOf(c) == -1)
    return warnInvalid (theField, s);

   i++;
  }

  c = "--";
  if (ss.indexOf(c) != -1)
   return warnInvalid (theField, s);

  return true;
 }
//检测密码
 function checkPassWord(theField)
 {
  if (theField.value.length < 4)
  {
   alert("密码长度小于4");
   theField.focus();
   return false;
  }
  else return true;
 }
//比较两次输入的密码
 function comparePWD(theField1,theField2,str){
  if(theField1.value!=theField2.value){
   alert(str);
   theField1.value="";
   theField2.value="";
   theField1.focus();
   return false;
  }
  else return true;
 }
//验证复选框
    function checkBox(form,str)
 {
 for (var i=0;i<form.elements.length; i++){
  var e = form.elements[i];
  if (e.value == "radio"&&e.checked)
   return true;
 }
 alert(str);
 return false;
 }
//检测汉字
  function CheckIString(stringObj)
  {
   var tempString=stringObj;
    if(stringObj==null)return false;
    if(stringObj.length==0)return false;
    for(;tempString.indexOf(" ")!=-1;tempString=tempString.replace(" ","")){}
    //alert(tempString.length);
 if(tempString.length==0)return false;
    var errorString=new Array("%","/","//","*","?","<",">","/'","/"","_");
    for(var i=errorString.length-1;i>-1;i--)
    {
      if(stringObj.indexOf(errorString[i])!=-1)return false;
    }
    return true;
  }
<!--End-->