Javascript: Validation alerts 2 - javascript

My goal is this:
Check if email and name are empty. If so, give 'Enter email or name' alert.
If they do, check for an # in email If none is found, give 'Bad email' alert.
Check if email and name contain any letters, if they do, give 'Success' alert
function test(email, name){
if(email=="" || name == "") {
alert("Enter mail or name");}
return false;
if(email.indexOf("#") == -1){
alert("Bad email");}
return false;
var a = email.length;
var b = name.length;
if(a==>0, b==>0){
alert("Message sent");}
return true;
}
This is what I've come up with so far, but it isn't working. I'm quite new at javascript so maybe you guys could tell me what I've done wrong?

The problem you're having is the close bracket is in the wrong place. You have it at the end of your alert statement and you probably want the return to be included with your if statement. if this is the case then change it to be:
function test(email, name){
if(email=="" || name == "") {
alert("Enter mail or name");
return false;
}
if(email.indexOf("#") == -1){
alert("Bad email");
return false;
}
var a = email.length;
var b = name.length;
if(a > 0 && b > 0){
alert("Message sent");
return true;
}
}
A better way to do the same thing would be because that way you're not checking the variables for length and size twice:
function test(email, name) {
var a = email.length;
var b = name.length;
if ( a > 0 && b > 0 ) {
// ignore 0 because email addresses shouldn't start with #
if ( email.indexOf("#") > 0 ) {
alert("Message sent");
return true;
}
else {
alert("Bad email");
return false;
}
}
else {
alert("Enter mail or name");
return false;
}
}

Try this JSFiddle that seems to fit your needs http://jsfiddle.net/9nF5W/
function test(email, name) {
if (email == "" || name == "") {
alert("Enter mail or name");
return false;
}
if (email.indexOf("#") == -1) {
alert("Bad email");
return false;
}
var a = email.length;
var b = name.length;
if (a > 0 && b > 0) {
alert("Message sent");
}
return true;
}
test('tes#t', 'test');
I think there is an other mistake than the returns statements in "if(a==>0, b==>0){" by the way.

Related

I have a javascript that checks if my form is valid and it stops checking after a certain field

So I made a form in a table in html and the javascript code checks till the (creditcard.value.length) after that the code doesn't check anything
<script language="javascript" type="text/javascript">
function ispsd(form) {
var passed = false;
if (form.Fullname.value.length < 4) {
alert("Enter a valid Full Name");
} else if (form.Email.value.indexOf("#") == -1) {
alert("Enter a valid E-mail adress.")
} else if (form.Email.value.indexOf(".") == -1) {
alert("Enter a valid E-mail adress.")
} else if (form.Cardholder.value.length < 3) {
alert("Card Holder name is not Valid.")
} else if (form.Creditcard.value.length != 16) {
alert("Credit card number is not valid.")
} else if (isNan(form.Creditcard.value)) {
alert("Credit card number cannot contain letters.")
} else if (isNan(form.Zip.value)) {
alert("Enter a valid Postal Code.")
} else if ((form.Expyear.value) * 1 < 2021) {
alert("Credit Card has Expired.")
} else if (isNan(form.Expyear.value)) {
alert("Enter a valid Year.")
} else if (form.cvv.value.length != 3) {
alert("Enter a valid CVV.")
} else if (isNan(form.cvv.value)) {
alert("CVV cannot contain letters.")
} else {
passed = true;
}
return passed;
}
</script>
and the thing is when I moved the (form.Expyear.value) * 1 < 2021) above the (form.Creditcard.value.length != 16) the validation worked and when I tried to add all the (else if) above the Credit card check it didn't work
don't know what's the problem
if anyone can help I would be thankful
You can always use console.log() to check what the variable has
function validate(form) {
if (form.Fullname.value.length < 4) {
alert('Enter a valid Full Name');
document.form.Fullname.focus();
return false;
}
if (form.Email.value.indexOf('#') == -1 || form.Email.value.indexOf('.') == -1) {
alert('Enter a valid E-mail adress.');
document.form.Email.focus();
return false;
}
if (form.Cardholder.value.length < 3) {
alert('Card Holder name is not Valid.');
document.form.Cardholder.focus();
return false;
}
console.log(form.Creditcard.value);
if (isNaN(form.Creditcard.value)) {
alert('Credit card number cannot contain letters.');
document.form.Creditcard.focus();
return false;
}
if (form.Creditcard.value.length < 16) {
alert('Credit card number is not valid.');
document.form.Creditcard.focus();
return false;
}
if (isNaN(form.Zip.value)) {
alert('Enter a valid Full Name');
document.form.Zip.focus();
return false;
}
if (isNaN(form.Expyear.value)) {
alert('Enter a valid Year.');
document.form.Expyear.focus();
return false;
}
if (Number(form.Expyear.value) < 2021) {
alert('Enter a valid Year.');
document.form.Expyear.focus();
return false;
}
if (isNaN(form.cvv.value)) {
alert('CVV cannot contain letters.');
document.form.cvv.focus();
return false;
}
if (form.cvv.value.length != 3) {
alert('Enter a valid Year.');
document.form.cvv.focus();
return false;
}
return true;
}
Try to remove the * 1, not sure what's the purpose there
isNaN, and not isNan
I would also handle it differently, what you need is to return true if they pass, rather than identify errors, for example, the demo here below. For example, it will pass your test if you have more than 16 numbers since you're checking x !== 16
function validate() {
var x, text;
// Get the value of the input field with id="numb"
x = document.getElementById("cc").value;
// If x is Not a Number or less than one or greater than 10
if (!isNaN(x) && x.length > 3 && x.length <= 16) {
text = "Input OK";
} else {
text = "Input not valid";
}
document.getElementById("error").innerHTML = text;
}
<p>Please write only numbers, from 4 to 16 maximum characters</p>
<input type="number" id="cc"/><br>
<span id="error"></span><br>
<input type="submit" onclick="validate()" />
Last but not least, this is so verbose and difficult to maintain, I strongly suggest using a library like this one https://www.npmjs.com/package/validator to handle validation, or even jQuery has .validate() useful function for beginner.

Validating numeric values using JavaScript

I have the following code. It works fine for blank fields, but it doesn't catch the other numeric exceptions. What am I doing wrong?
function validateForm() {
var a = document.forms["Form"]["percentage"].value;
var b = document.forms["Form"]["minutes"].value;
if (a == null || b == null || a == "" || b == "") {
alert("Please Fill All Required Field");
return false;
} else if (isNan(a) == true || isNan(b) == true) {
alert("Please enter valid numeric values");
return false;
} else if (parseInt(a) > 100) {
alert("Percentage can't exceed 100");
return false;
} else if (parseInt(b) < 0 || parseInt(a) < 0) {
alert("Values can't be negative");
return false;
}
}
Change this line:
else if((isNan(a)==true) ||(isNan(b)==true)){
to this:
else if (isNaN(a) || isNaN(b)) {
as the function is named #isNaN(). Using == true in conditionals is quite redundant, so I removed them.
I have also made a fiddle for you. It contains the fixed code, and it is working well.

validation form : how to show error message all at one time for the blank input instead of one by one?

I want to validate my form, if any of the input field is blank, the error warning will show beside the blank input field. The error message must be comes out all at one time for the blank input, not show one by one. How to do this?
Below is my javascript code :
function doValidate()
{
var x=document.forms["form"]["fullname"].value;
if (x==null || x=="")
{
document.getElementById('error1').innerHTML="Full name is required!";
return false;
}
var y=document.forms["form"]["uid"].value;
if (y==null || y=="")
{
document.getElementById('error2').innerHTML="Username is required!";
return false;
}
var z=document.forms["form"]["pwd"].value;
if (z==null || z=="")
{
document.getElementById('error3').innerHTML="Password is required!";
return false;
}
var a=document.forms["form"]["pwd2"].value;
if (a==null || a=="")
{
document.getElementById('error4').innerHTML="Please re-enter your password!";
return false;
}
var pwd = document.getElementById("pwd").value;
var pwd2 = document.getElementById("pwd2").value;
if(pwd != pwd2){
alert('Wrong confirm password!');
return false;
}
var b=document.forms["form"]["role"].value;
if (b==null || b=="Please select...")
{
document.getElementById('error5').innerHTML="Please select user role!";
return false;
}
}
You should start your function with var ok = true, and in each if-block, instead of having return false, you should set ok = false. At the end, return ok.
Here's what that might look like:
function doValidate() {
var ok = true;
var form = document.forms.form;
var fullname = form.fullname.value;
if (fullname == null || fullname == "") {
document.getElementById('error1').innerHTML = "Full name is required!";
ok = false;
}
var uid = form.uid.value;
if (uid == null || uid == "") {
document.getElementById('error2').innerHTML = "Username is required!";
ok = false;
}
var pwd = form.pwd.value;
if (pwd == null || pwd == "") {
document.getElementById('error3').innerHTML = "Password is required!";
ok = false;
}
var pwd2 = form.pwd2.value;
if (pwd2 == null || pwd2 == "") {
document.getElementById('error4').innerHTML = "Please re-enter your password!";
ok = false;
} else if (pwd != pwd2) {
document.getElementById('error4').innerHTML = "Wrong confirm password!";
ok = false;
}
var role = form.role.value;
if (role == null || role == "Please select...") {
document.getElementById('error5').innerHTML = "Please select user role!";
ok = false;
}
return ok;
}
(I've taken the liberty of changing to a more consistent formatting style, improving some variable-names, simplifying some access patterns, and replacing an alert with an inline error message like the others.)

How do I correctly perform form validation in JavaScript?

I am having a hard time trying to do a correct form validation. I have Name, Email, and Phone Number fields. I implemented the validation check for all of them and when I click on the submit query, it returns email as false, but not anything else. It also will still submit the form. How do I fix this?
JSFiddle: http://jsfiddle.net/GVQpL/
JavaScript Code:
function validateForm(/*fullName, email, phoneNumber*/)
{
//-------------------------NAME VALIDATION-----------------------------//
var fullNameV = document.forms["queryForm"]["fullName"].value;
if (fullNameV == null || fullNameV == "")
{
alert("Name must be filled out!");
return false;
}
else if(fullNameV.indexOf(" ") <= fullNameV.length)
{
alert("Not a valid name");
return false;
}
//-------------------------EMAIL VALIDATION-----------------------------//
var emailV = document.forms["queryForm"]["email"].value;
if (emailV == null || emailV == "")
{
alert("Email must be filled out!");
return false;
}
var atpos = emailV.indexOf("#");
var dotpos = emailV.lastIndexOf(".");
if (atpos < 1 || dotpos < atpos + 2 || dotpos + 2 >= x.length)
{
alert("Not a valid e-mail address");
return false;
}
//-------------------------PHONE # VALIDATION-----------------------------//
var phoneNumberV = document.forms["queryForm"]["phoneNumber"].value;
if (phoneNumberV == null || phoneNumberV == "")
{
alert("Phone Number must be filled out!");
return false;
}
var error = "";
var stripped = phoneNumberV.replace(/[\(\)\.\-\ ]/g, '');
if (phoneNumberV == "")
{
error = alert("You didn't enter a phone number.\n");
phoneNumberV.style.background = 'Yellow';
}
else if (isNaN(parseInt(stripped)))
{
error = alert("The phone number contains illegal characters.\n");
phoneNumberV.style.background = 'Yellow';
}
else if (!(stripped.length == 10))
{
error = alert("The phone number is the wrong length. Make sure you included an area code.\n");
phoneNumberV.style.background = 'Yellow';
}
return error;
}
Update your fiddle's html for the function to be called onsubmit="return validateForm()" and removed the required="required" changed your function to work, you can see it here:
http://jsfiddle.net/GVQpL/3/
function validateForm(/*fullName, email, phoneNumber*/)
{
//-------------------------NAME VALIDATION-----------------------------//
var fullNameV = document.forms["queryForm"]["fullName"].value;
if (fullNameV == null || fullNameV == "")
{
alert("Name must be filled out!");
document.forms["queryForm"]["fullName"].focus();
return false;
}
else if(fullNameV.indexOf(" ") >= fullNameV.length)
{
alert("Not a valid name");
document.forms["queryForm"]["fullName"].focus();
return false;
}
//-------------------------EMAIL VALIDATION-----------------------------//
var emailV = document.forms["queryForm"]["email"].value;
if (emailV == null || emailV == "")
{
alert("Email must be filled out!");
document.forms["queryForm"]["email"].focus();
return false;
}
var emailReg = /^([\w-\.]+#([\w-]+\.)+[\w-]{2,4})?$/;
if(!emailReg.test(emailV)){
alert("Not a valid e-mail address");
document.forms["queryForm"]["email"].focus();
return false;
}
//-------------------------PHONE # VALIDATION-----------------------------//
var phoneNumberV = document.forms["queryForm"]["phoneNumber"].value;
if (phoneNumberV == null || phoneNumberV == "")
{
alert("Phone Number must be filled out!");
document.forms["queryForm"]["phoneNumber"].focus();
return false;
}
var error = "";
var stripped = phoneNumberV.replace(/[\(\)\.\-\ ]/g, '');
if (phoneNumberV == "")
{
alert("You didn't enter a phone number.\n");
document.forms["queryForm"]["phoneNumber"].focus()
document.forms["queryForm"]["phoneNumber"].style.background = 'Yellow';
return false;
}
else if (isNaN(parseInt(stripped)))
{
alert("The phone number contains illegal characters.\n");
document.forms["queryForm"]["phoneNumber"].focus();
document.forms["queryForm"]["phoneNumber"].style.background = 'Yellow';
return false;
}
else if (!(stripped.length == 10))
{
alert("The phone number is the wrong length. Make sure you included an area code.\n");
document.forms["queryForm"]["phoneNumber"].focus();
document.forms["queryForm"]["phoneNumber"].style.background = 'Yellow';
return false;
}
if(!confirm('Are you sure you want to submit your DSLR query?')){
return false;
}
return true;
}

How to validate multiple fields at the same time using JQuery

I have created a form that validates using JQuery and JavaScript. The only problem is, would be that it validates one field at a time. So the user has to correct the first field first and then press submit again to see if the next field is valid.
What I would like to to do, is have the JQuery validate the whole form after pressing submit and show all the applicable error messages.
Here is My JS:
function validateUserName()
{
var u = document.forms["NewUser"]["user"].value
var uLength = u.length;
var illegalChars = /\W/; // allow letters, numbers, and underscores
if (u == null || u == "")
{
$("#ErrorUser").text("You Left the Username field Emptyyy");
return false;
}
else if (uLength < 4 || uLength > 11)
{
$("#ErrorUser").text("The Username must be between 4 and 11 characters");
return false;
}
else if (illegalChars.test(u))
{
$("#ErrorUser").text("The Username contains illegal charectors men!");
return false;
}
else
{
return true;
}
}
function validatePassword()
{
var p = document.forms["NewUser"]["pwd"].value
var cP = document.forms["NewUser"]["confirmPwd"].value
var pLength = p.length;
if (p == null || p == "")
{
$("#ErrorPassword1").text("You left the password field empty");
return false;
}
else if (pLength < 6 || pLength > 20)
{
$("#ErrorPassword1").text("Your password must be between 6 and 20 characters in length");
return false;
}
else if (p != cP)
{
$("#ErrorPassword1").text("Th passwords do not match!");
return false;
}
else
{
return true;
}
}
function validateEmail()
{
var e = document.forms["NewUser"]["email"].value
var eLength = e.length;
var emailFilter = /^[^#]+#[^#.]+\.[^#]*\w\w$/;
var illegalChars = /[\(\)\<\>\,\;\:\\\"\[\]]/;
if (eLength == "" || eLength == null)
{
$("#ErrorEmail").text("You left the email field blank!");
return false;
}
else if (e.match(illegalChars))
{
$("#ErrorEmail").text("ILEGAL CHARECTORS DETECTED EXTERMINATE");
return false;
}
else
{
return true;
}
}
function validateFirstName()
{
var f = document.forms["NewUser"]["fName"].value;
var fLength = f.length;
var illegalChars = /\W/;
if (fLength > 20)
{
$("#ErrorFname").text("First Name has a max of 20 characters");
return false;
}
else if (illegalChars.test(f))
{
$("#ErrorFname").text("Numbers,letter and underscores in first name only");
return false;
}
else
{
return true;
}
}
function validateLastName()
{
var l = document.forms["NewUser"]["lName"].value;
var lLength = l.length;
var illegalChars = /\W/;
if (lLength > 100)
{
$("#ErrorLname").text("Last Name has a max of 100 characters");
return false;
}
else if (illegalChars.test(f))
{
$("#ErrorLname").text("Numbers,letter and underscores in last name only");
return false;
}
else
{
return true;
}
}
function validateForm()
{
valid = true;
//call username function
valid = valid && validateUserName();
//call password function
valid = valid && validatePassword();
//call email function
valid = valid && validateEmail();
//call first name function
valid = valid && validateFirstName();
//call first name function
valid = valid && validateLastName();
return valid;
}
And here is my submit form code:
$('#your-form').submit(validateForm);
Instead of returning true or false return a string containing the error and an empty string if no error was found.
Then validateForm could be something like
function validateForm()
{
error = "";
//call username function
error += "\n"+validateUserName();
//call password function
error += "\n"+validatePassword();
...
if(error === ""){
return true;
}
$("#ErrorLname").text(error);
return false;
}
Working Fiddle
var validate;
function validateUserName()
{
validate = true;
var u = document.forms["NewUser"]["user"].value
var uLength = u.length;
var illegalChars = /\W/; // allow letters, numbers, and underscores
if (u == null || u == "")
{
$("#ErrorUser").text("You Left the Username field Emptyyy");
validate = false;
}
else if (uLength <4 || uLength > 11)
{
$("#ErrorUser").text("The Username must be between 4 and 11 characters");
validate = false;
}
else if (illegalChars.test(u))
{
$("#ErrorUser").text("The Username contains illegal charectors men!");
validate = false;
}
}
function validatePassword()
{
var p = document.forms["NewUser"]["pwd"].value
var cP = document.forms["NewUser"]["confirmPwd"].value
var pLength = p.length;
if (p == null || p == "")
{
$("#ErrorPassword1").text("You left the password field empty");
validate = false;
}
else if (pLength < 6 || pLength > 20)
{
$("#ErrorPassword1").text("Your password must be between 6 and 20 characters in length");
validate = false;
}
else if (p != cP)
{
$("#ErrorPassword1").text("Th passwords do not match!");
validate = false;
}
}
function validateEmail()
{
var e = document.forms["NewUser"]["email"].value
var eLength = e.length;
var emailFilter = /^[^#]+#[^#.]+\.[^#]*\w\w$/ ;
var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
if (eLength == "" || eLength == null)
{
$("#ErrorEmail").text("You left the email field blank!");
validate = false;
}
else if (e.match(illegalChars))
{
$("#ErrorEmail").text("ILEGAL CHARECTORS DETECTED EXTERMINATE");
validate = false;
}
}
function validateFirstName()
{
var f = document.forms["NewUser"]["fName"].value;
var fLength = f.length;
var illegalChars = /\W/;
if(fLength > 20)
{
$("#ErrorFname").text("First Name has a max of 20 characters");
validate = false;
}
else if (illegalChars.test(f))
{
$("#ErrorFname").text("Numbers,letter and underscores in first name only");
validate = false;
}
}
function validateLastName()
{
var l = document.forms["NewUser"]["lName"].value;
var lLength = l.length;
var illegalChars = /\W/;
if(lLength > 100)
{
$("#ErrorLname").text("Last Name has a max of 100 characters");
validate = false;
}
else if (illegalChars.test(f))
{
$("#ErrorLname").text("Numbers,letter and underscores in last name only");
validate = false;
}
}
function validateForm()
{
validateUserName();
validatePassword();
validateEmail();
validateFirstName();
validateLastName();
return validate;
}
You need to access all the fields and check if the field is valid r not. If the field is valid skip it, otherwise put the field in an array. When all the fields have been checked, then display the error fields from the array all at one time.

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