JavaScript表单验证大全（三）

/*
JavaScript脚本，验证表单中的数据项 begin
-------------------------------------------------------------------------------
*/
function checkForm(objFrm){
var len = 0;
len = objFrm.elements.length;
var i = 0;
var objCheck;
//文本框
for(i = 0; i < len; i ++){
objCheck = objFrm.elements[i];
if(objCheck.type =="text" && !f_checkTextValid(objCheck) ){
return false;
}
}
//下拉框
for(i = 0; i < len; i ++){
objCheck = objFrm.elements[i];
if(objCheck.type =="select-one" && !f_checkSelectValid(objCheck) ){
return false;
}
}
//时间段有效
if( f_checkStartAndEndDate(objFrm) == false) return false;
return true;
}
function f_checkSelectValid(obj){
//alert("check select");
if(obj.options.length <= 0){
alert("下拉选框无数据!");
return false;
}
return true;
}
function f_checkStartAndEndDate(frm){
var len = frm.elements.length;
if(len == null && len == 0) return true;
var i=0;
var temp;
var objCheck;
var objStartDate;
var objEndDate;
//alert("start date period check");
try{
for(i=0; i< len ; i++){
objCheck = frm.elements[i];
temp = objCheck.name;
if( temp.indexOf("startDate") >0 ||temp.indexOf("beginDate")>0 )
objStartDate = objCheck;
if( temp.indexOf("endDate") > 0 )
objEndDate = objCheck;
}
//alert(objStartDate.value);
//alert(objEndDate.value);
if(objStartDate.value==null || objStartDate.value =="" || objStartDate.value ==null || objStartDate.value ==""){
return true;
}
return checkTwoDate(objStartDate.value, objEndDate.value);
//alert("end date period check");
}catch(E){}
return true;
}
function f_checkTextValid(obj){
//不能为空
if(obj.getAttribute("isNeed") != null){
if(f_isNotNull(obj) == false) return false;
}
//不能超过长度
if(obj.getAttribute("maxlength") != null){
if(f_checkLength(obj) == false) return false;
}
var checkType ="";
checkType = obj.getAttribute("checkType");
if(checkTyp