JS form validation codes commonly used in work (including examples)_Form special effects

////---------- -----Author Teng-------------
//Verify whether it is empty
function check_blank(obj, obj_name){
if(obj.value != ''){
return true;
}else{
alert(obj_name "Filled in cannot be empty!");
obj.value = "";
return false;
}
}

//Filter the length of input characters
function check_str_len(name,obj,maxLength){
obj.value=obj.value.replace(/(^s* )|(s*$)/g, "");
var newvalue = obj.value.replace(/[^x00-xff]/g, "**");
var length11 = newvalue. length;
if(length11>maxLength){
alert(name " cannot exceed " maxLength " characters!");
obj.value="";
obj.focus() ;
}
}

//Validation can only be numbers
function checkNumber(obj){
var reg = /^[0-9] $/;
if(obj.value!=""&&!reg.test(obj.value)){
alert('Only numbers can be entered!');
obj.value = "";
obj. focus();
return false;
}
}

//Verify the range of number size

function check_num_value(obj_name,obj,minvalue,maxvalue){
var reg = /^[0-9] $/;
if(obj.value!=""&&!reg.test(obj.value)){
alert(obj_name 'Only numbers can be entered ! ');
obj.value = "";
obj.focus();
return false;
}else if(minvalue>obj.value||obj.value>maxvalue){
alert(obj_name "range is " minvalue "-" maxvalue "!");
obj.value="";
obj.focus();
return false;
}

}

//Verification can only be letters and numbers
function checkZmOrNum(zmnum){
var zmnumReg=/^[0-9a-zA-Z]*$ /;
if(zmnum.value!=""&&!zmnumReg.test(zmnum.value)){
alert("Only letters or numbers can be entered, please re-enter");
zmnum .value="";
zmnum.focus();
return false;
}
}

//Verify double precision number
function check_double(obj,obj_name ){
var reg = /^[0-9] (.[0-9] )?$/;
if(obj.value!=""&&!reg.test(obj.value)) {
alert(obj_name 'Filled in must be a valid double precision number');
obj.value = "";
obj.focus();
return false;
}
}


//Select all checkboxes
function checkboxs_all(obj,cName){
var checkboxs = document.getElementsByName(cName);
for(var i =0;icheckboxs[i].checked = obj.checked;
}
}


//Verify zip code
function check_youbian(obj){
var reg=/^d{6}$/;
if(obj.value!=""&&!reg.test(obj.value)){
alert ('Postcode format input error! ');
obj.value = "";
obj.focus();
return false;
}
}

//Verify email format
function check_email(obj){
var reg = /^[a-zA-Z0-9_-] (.([a-zA-Z0-9_-]) )*@[a-zA-Z0-9_- ] [.][a-zA-Z0-9_-] ([.][a-zA-Z0-9_-] )*$/;
if(obj.value!=""&&!reg.test (obj.value)){
obj.select();
alert('E-mail format input error!');
obj.value = "";
obj.focus();
return false;
}
}

/*Verify landline number
0d{2,3} represents area code
[0 ]d{2,3} represents International area code
d{7,8} represents 7-8 digits (indicating phone number)
Correct format: area code-telephone number-extension number (write in full|write only phone number)
*/

function check_phone(obj){
var reg=/^(([0 ]d{2,3}-)?(0d{2,3})-)?(d{7,8 })(-(d{3,}))?$/;
if(obj.value!=""&&!reg.test(obj.value)){
alert('Phone number format input Error! ');
obj.value = "";
obj.focus();
return false;
}
}

//Verify mobile number ( Check mobile phone numbers starting with 13, 15, 18! )
function check_telephone(obj){
var reg= /^[1][358]d{9}$/;
if(obj.value !=""&&!reg.test(obj.value)){
alert('Mobile phone number format is incorrect!');
obj.value = "";
obj.focus();
return false;
}
}

//Verify whether it is Chinese
function isChinese(obj,obj_name){
var reg=/^[u0391-uFFE5] $/;
if(obj.value!=""&&!reg.test(obj.value)){
alert(obj_name 'Must enter Chinese! ');
obj.value = "";
obj.focus();
return false;
}
}

//Determine whether it is an IE browser

function checkIsIE(){
if(-[1,]){
alert("This is not IE!");
}else{
alert(" This is IE browser! ");
}
}

//Verify whether it is the correct URL
function check_IsUrl(obj){


}

//Check time size (compared with current time)
function checkDate(obj,obj_name){
var obj_value=obj.value.replace(/-/g,"/");/ /Replace characters and change to standard format (test format is: '2009-12-10')
// var obj_value=obj.value.replace("-","/");//Replace characters and change into standard format (test format is: '2010-12-10 11:12')
var date1=new Date(Date.parse(obj_value));
var date2=new Date();//Get Today's date
if(date1>date2){
alert(obj_name "Cannot be greater than the current time!");
return false;
}
}
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