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用正则表达式和javascript对表单进行全面验证

摘要: 用正则表达式和javascript对表单进行全面验证
<tr> <td>

代码:


<script type="text/javascript">
function getStringLength(str){
var endvalue=0;
var sourcestr=new String(str);
var tempstr;
for (var strposition = 0; strposition < sourcestr.length; strposition ++) {
tempstr=sourcestr.charAt(strposition);
if (tempstr.charCodeAt(0)>255 || tempstr.charCodeAt(0)<0) {
endvalue=endvalue+2;
} else {
endvalue=endvalue+1;
}
}
return(endvalue);
}
function trim(str){
if(str==null) return "";
if(str.length==0) return "";
var i=0,j=str.length-1,c;
for(;i c=str.charAt(i);
if(c!=' ') break;
}
for(;j>-1;j--){
c=str.charAt(j);
if(c!=' ') break;
}
if(i>j) return "";
return str.substring(i,j+1);
}
function validateDate(date,format,alt){
var time=trim(date.value);
if(time=="") return;
var reg=format;
var reg=reg.replace(/yyyy/,"[0-9]{4}");
var reg=reg.replace(/yy/,"[0-9]{2}");
var reg=reg.replace(/MM/,"((0[1-9])|1[0-2])");
var reg=reg.replace(/M/,"(([1-9])|1[0-2])");
var reg=reg.replace(/dd/,"((0[1-9])|([1-2][0-9])|30|31)");
var reg=reg.replace(/d/,"([1-9]|[1-2][0-9]|30|31))");
var reg=reg.replace(/HH/,"(([0-1][0-9])|20|21|22|23)");
var reg=reg.replace(/H/,"([0-9]|1[0-9]|20|21|22|23)");
var reg=reg.replace(/mm/,"([0-5][0-9])");
var reg=reg.replace(/m/,"([0-9]|([1-5][0-9]))");
var reg=reg.replace(/ss/,"([0-5][0-9])");
var reg=reg.replace(/s/,"([0-9]|([1-5][0-9]))");
reg=new RegExp("^"+reg+"$");
if(reg.test(time)==false){//验证格式是否合法
alert(alt);
date.focus();
return false;
}
return true;
}
function validateDateGroup(year,month,day,alt){
var array=new Array(31,28,31,30,31,30,31,31,30,31,30,31);
var y=parseInt(year.value);
var m=parseInt(month.value);
var d=parseInt(day.value);
var maxday=array[m-1];
if(m==2){
if((y%4==0&&y%100!=0)||y%400==0){
maxday=29;
}
}
if(d>maxday){
alert(alt);
return false;
}
return true;
}
function validateCheckbox(obj,alt){
var rs=false;
if(obj!=null){
if(obj.length==null){
return obj.checked;
}
for(i=0;i if(obj[i].checked==true){
return true;
}
}
}
alert(alt);
return rs;
}
function validateRadio(obj,alt){
var rs=false;
if(obj!=null){
if(obj.length==null){
return obj.checked;
}
for(i=0;i if(obj[i].checked==true){
return true;
}
}
}
alert(alt);
return rs;
}
function validateSelect(obj,alt){
var rs=false;
if(obj!=null){
for(i=0;i if(obj.options[i].selected==true){
return true;
}
}
}
alert(alt);
return rs;
}
function validateEmail(email,alt,separator){
var mail=trim(email.value);
if(mail=="") return;
var em;
var myReg = /^[_a-z0-9]+@([_a-z0-9]+\.)+[a-z0-9]{2,3}$/;
if(separator==null){
if(myReg.test(email.value)==false){
alert(alt);
email.focus();
return false;
}
}
else{
em=email.value.split(separator);
for(i=0;i em[i]=em[i].trim();
if(em[i].length>0&&myReg.test(em[i])==false){
alert(alt);
email.focus();
return false;
}
}
}
return true;
}
function validateForm(theForm){// 若验证通过则返回true
var disableList=new Array();
var field = theForm.elements; // 将表单中的所有元素放入数组
for(var i = 0; i < field.length; i++){
var vali=theForm.validate;
if(vali!=null){
if(vali.value=="0"){
var fun=vali.functionName;
if(fun!=null){
return eval(fun+"()");
}
else{
return true;
}
}
}

var empty=false;
var value=trim(field[i].value);
if(value.length==0){//是否空值
empty=true;
}
var emptyInfo=field[i].emptyInfo;//空值验证
if(emptyInfo!=null&&empty==true){
alert(emptyInfo);
field[i].focus();
return false;
}
var lengthInfo=field[i].lengthInfo;//最大长度验证
if(lengthInfo!=null&&getStringLength(value)>field[i].maxLength){
alert(lengthInfo);
field[i].focus();
return false;
}

var validatorType=field[i].validatorType;
if(validatorType!=null){//其它javascript
var rs=true;
if(validatorType=="javascript"){
eval("rs="+field[i].functionName+"()");
if(rs==false){
return false;
}
else{
continue;
}
}
else if(validatorType=="disable"){//提交表单前disable的按钮
disableList.length++;
disableList[disableList.length-1]=field[i];
continue;
}
else if(validatorType=="Date"){
rs=validateDate(theForm.elements(field[i].fieldName),field[i].format,field[i].errorInfo);
}
else if(validatorType=="DateGroup"){
rs=validateDateGroup(theForm.elements(field[i].year),theForm.elements(field[i].month),theForm.elements(field[i].day),field[i].errorInfo);
}
else if(validatorType=="Checkbox"){
rs=validateCheckbox(theForm.elements(field[i].fieldName),field[i].errorInfo);
}
else if(validatorType=="Radio"){
rs=validateRadio(theForm.elements(field[i].fieldName),field[i].errorInfo);
}
else if(validatorType=="Select"){
rs=validateSelect(theForm.elements(field[i].fieldName),field[i].errorInfo);
}
else if(validatorType=="Email"){
rs=validateEmail(theForm.elements(field[i].fieldName),field[i].errorInfo);
}
else{
alert("验证类型不被支持, fieldName: "+field[i].name);
return false;
}
if(rs==false){
return false;
}
}
else{//一般验证
if(empty==false){
var v = field[i].validator; // 获取其validator属性
if(!v) continue; // 如果该属性不存在,忽略当前元素
var reg=new RegExp(v);
if(reg.test(field[i].value)==false){
alert(field[i].errorInfo);
field[i].focus();
return false;
}
}
}
}
for(i=0;i disableList[i].disabled=true;
}
return true;
}
</script>

</td> </tr> </table>
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