Password validation is not working in the login form. Here is my code:
function verifyPassword() {
var str = document.getElementById("t1").value;
if (str.match(/[a-z]/g) &&
str.match(/[A-Z]/g) &&
str.match(/[0-9]/g) &&
str.match(/[^a-zA-Z\d]/g) &&
str.length >= 8)
return true;
else
return false;
}
You should call the function in the password field's change event and/or the form's submit event, not the form's click event. And you need to test the return value and do something.
document.getElementById('t1').addEventListener('change', function() {
if (!verifyPassword()) {
alert("Invalid password");
}
}
document.getElementByTagName('form')[0].addEventListener('change', function(event) {
if (!verifyPassword()) {
event.preventDefault();
alert("Invalid password");
}
}
Below you have a cleaner code and is checking your password, you must have: lowercase, uppercase character, and a number. The ^ symbol means that the password must be in this order: lowercase, uppercase, number and must be more than 8 characters.
The syntax ?=.*[x] means that you must have the condition x in your string.
Your old code was only checking if your string has any of these (lowercase, uppercase characters, numbers) but didn't put the condition that you must have all of these and for your password system this was useless.
function verifyPassword() {
var str = document.getElementById("t1").value;
var regEx = new RegExp("^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.{8,})");
if (regEx.test(str) &&
str.length >= 8)
console.log("good")
else
console.log("bad")
}
<div class="txt_field">
<input type="password" id="t1" value="" required>
<label>Password</label>
<button onclick="verifyPassword()">Verify</button>
</div>
Related
I want to add an alert inside the if and else if. If the user does not enter anything in the prompt box the alert triggers. Also if the user enters a number the prompt it will say that the user entered a number. How do do that?
let myForm2 = document.querySelector('.form2');
let pDisplay1 = document.querySelector('.display4');
myForm2.addEventListener('submit', function(e) {
e.preventDefault();
let uname = document.querySelector('.inputName2').value;
if (uname == null) {
} else if (isNaN(uname) == false) {
} else {
pDisplay1.innerHTML = `Welcome to the program ${uname}`;
}
})
<p> Activity 6</p>
<form class="form2" method="get">
<label>Full Name: <input type="text" class="inputName2"></label>
<input type="submit">
</form>
<p class="display4"></p>
document.querySelector('.className').value will return a string.
string.trim() removes the whitespaces and if the length === 0 it means that the input is empty or has only whitespaces which you generally want to treat as empty. If you consider space is a valid input you don't have to use trim().
The + sign will convert a string into a number otherwise you could use parseInt(variable).
Number.isInteger(variable) will return true if the variable is an integer.
You could also write !isNaN(+uname) or +uname !== Number.NaN
myForm2.addEventListener('submit', function (e) {
e.preventDefault();
let uname = document.querySelector('.inputName2').value;
if (uname.trim().length === 0) {
alert('You should write something');
} else if (Number.isInteger(+uname)) {
alert('You wrote a number');
} else {
pDisplay1.innerHTML = `Welcome to the program ${uname}`;
}
});
Empty string is not equal to null, replace uname==null with uname=='', after the replacement, you can identify the situation that the user did not input, if it is more strict, you can also use trim to remove whitespace and then do condition review
Okay, so I have a form. Applied a function to it.
All I want to do is when the form is submitted it launches the function, it checks to see if there is white space and throws out a message. I have the following:
function empty() {
var x;
x = document.getElementById("Username").value;
if (x == "") {
alert("Please ensure you fill in the form correctly.");
};
}
<input type='submit' value='Register' onClick='return empty()' />
<input type='text' id="Username" />
This is fine for if someone pressed the space-bar once and enters one line of whitespace, but how do I edit the function so that no matter how many spaces of whitespace are entered with the space-bar it will always throw back the alert.
Thanks in advance. I am very new to JavaScript. So please be gentle.
Trim the string before testing it.
x = document.getElementById("Username").value.trim();
This will remove any whitespace at the beginning and end of the value.
I have made a function for the same, i added another checks (including a regular expresion to detect multiples empty spaces). So here is the code:
function checkEmpty(field){
if (field == "" ||
field == null ||
field == "undefinied"){
return false;
}
else if(/^\s*$/.test(field)){
return false;
}
else{
return true;
}
}
Here is an example working with jquery: https://jsfiddle.net/p87qeL7f/
Here is the example in pure javascript: https://jsfiddle.net/g7oxmhon/
Note: the function checkEmpty still be the same for both
this work for me
$(document).ready(function() {
$('#Description').bind('input', function() {
var c = this.selectionStart,
r = /[^a-z0-9 .]/gi,
v = $(this).val();
if (r.test(v)) {
$(this).val(v.replace(r, ''));
c--;
}
this.setSelectionRange(c, c);
});
});
function checkEmpty(field) { //1Apr2022 new code
if (field == "" ||
field == null ||
field == "undefinied") {
return false;
} else if (/^\s*$/.test(field)) {
return false;
} else {
return true;
}
}
I have created a validate function using JavaScript. I need a validation that tests that password field in a form to make sure it is:
At least 8 characters.
Contains a numeric value.
Contains an alphabetic value.
I just need an If statement inside my validate function
function Validate()
{
with(document.memberInfo) {
evt = new userInfo(username.value, password.value, email.value, firstname.value, lastname.value, age.value, description.value);
}
with(evt)
{
if((email.indexOf("#",0)==-1))
{
alert("The email must contain the # symbol.");
return false;
}
evt.printEvent();
}
return true;
}
using regx function you can validate ur form . here is the code .
var xstr="^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$";
var str=Document.getElementById("id").value;
var ck=xstr.exec(str);
if(!ck || ck[0]!=str){
//code
}
you can use regex "/^(?=.*[0-9])(?=.*[a-zA-Z]).{8,}$/" refer this link stackoverflow
JsFiddle
var regex = /^(?=.*[0-9])(?=.*[a-zA-Z]).{8,}$/;
function getValue() {
return document.getElementById("myinput").value;
}
function test() {
alert(regex.test(getValue()));
}
function match() {
alert(getValue().match(regex));
}
<input type="text" id="myinput" value="vexillology"/>
<button id="testBtn" onclick=test()>test</button>
<button id="matchBtn" onclick=match()>match</button>
Using regex is the way to go, but the more readable solution is probably:
function isValid(pass) {
return pass.length >= 8 && // at least 8 characters
/\d/.test(pass) && // contains a digit
/[A-Za-z]/.test(pass); // contains a letter
}
function isValid(pass) {
return pass.length >= 8 &&
/\d/.test(pass) &&
/[A-Za-z]/.test(pass);
}
var field = document.getElementById("password");
var output = document.getElementById("output");
field.onkeyup = function() {
output.innerHTML = isValid(field.value) ? "Valid" : "Not Valid";
}
<input type="text" id="password" placeholder="Enter password" />
<span id="output"></span>
Alternatively, you can put it all in one regex:
function isValid(pass) {
return /^(?=.*[A-Za-z])(?=.*\d).{8,}$/.test(pass);
}
JSFiddle
Hi sorry i'm still pretty new to javascript.
I've developed a form in HTML and now i'm attempting to add javascript to validate the form.
So far i have simple javascript to make sure each element is filled in,
if (document.order.suburb.value=="")
{
alert("Suburb Cannot Be Empty")
return false
}
if (document.order.postcode.value=="")
{
alert("Postcode Cannot Be Empty")
return false
}
I then have javascript to validate the length of some of the elements,
if (document.order.telephone.value.length < 10)
{
alert("Invalid Telephone Number")
return false
}
Now i'm trying to validate numeric values in the telephone number part but it's not executing correctly, it's like the code is just ignored when it's being executed.
var digits="0123456789"
var temp
var i
for (i = 0 ; i <document.order.telephone.value.length; i++)
{
temp=document.order.telephone.value.substring(i,i+1)
if (digits.indexOf(temp)==-1)
{
alert("Invalid Telephone Number")
return false
}
}
Thanks for reading and thanks for the help :) been stuck on this issue for weeks and have no idea what i'm doing wrong, i tried to code on a separate document with another form and it seemed to work fine.
EDIT
Code for validation for digits in postcode
var post = document.order.postcode.value.replace(white,'');
if(!post){
alert("Post code required !");
return false;
}
post = post.replace(/[^0-9]/g,'');//replace all other than digits
if(!post || 4 > postcode.length) {
alert("Invalid Postcode !");
return false;
}
You may try this example:
var validate = function() {
var white = /\s+/g;//for handling white spaces
var nonDigit = /[^0-9]/g; //for non digits
if(!document.order.suburb.value.replace(white, '')) {
alert("Suburb required !");
return false; //don't allow to submit
}
var post = document.order.postcode.value.replace(white, '')
if(!post) {
alert("Post code required !");
return false;
}
post = post.replace(nonDigit,'');//replace all other than digits
if(!post || 6 > post.length) { //min post code length
alert("Invalid Post code !");
return false;
}
var tel = document.order.telephone.value.replace(white, '');
if(!tel) {
alert("Telephone required !");
return false;
}
tel = tel.replace(nonDigit,'');
if(!tel || 10 > tel.length) {
alert("Invalid Telephone !");
return false;
}
return true; //return true, when above validations have passed
};
<form onsubmit="return validate();" action="#" name="order">
Suburb: <input type="text" id="suburb" name="suburb" ><br/>
Post code: <input type="text" id="postcode" name="postcode"/><br/>
Telephone: <input type="text" id="telephone" name="telephone"/><br/>
<input type="reset"/><input type="submit"/>
</form>
Here is a FIDDLE that will give you something to think about.
You could handle this task in hundreds of ways. I've just used a regex and replaced all of the non-numbers with '' - and compared the length of two variables - if there is anything other than a number the length of the regex variable will be shorter than the unchanged mytelephone.
You can do all kinds of "validation" - just me very specific in how you define "valid".
JS
var mysuburb, mypostcode, mytelephone;
$('.clickme').on('click', function(){
mysuburb = $('.suburb').val();
mypostcode = $('.postcode').val();
mytelephone = $('.telephone').val();
console.log(mysuburb + '--' + mypostcode + '--' + mytelephone);
if(mysuburb.length < 1)
{
$('.errorcode').html('');
$('.errorcode').append('Suburb is required');
return false;
}
if(mypostcode.length < 1)
{
$('.errorcode').html('');
$('.errorcode').append('postode is required');
return false;
}
if( mytelephone.length < 1 )
{
$('.errorcode').html('');
$('.errorcode').append('telephone number is required');
return false;
}
if( mytelephone.length != mytelephone.replace(/[^0-9]/g, '').length)
{
$('.errorcode').html('');
$('.errorcode').append('telephone number must contain only numbers');
return false;
}
});
,Hi all,
var veri = {
YeniSifreTextBox: $('#YeniSifreTextBox_I').val(),
YeniSifreTekrarTextBox: $('#YeniSifreTekrarTextBox_I').val(),
};
if (veri.YeniSifreTextBox == '' || veri.YeniSifreTekrarTextBox == '') {
alert("Password Can not be empty!");
}
else if (veri.YeniSifreTextBox != veri.YeniSifreTekrarTextBox) {
alert("Passwords dont not match !");
}
I can control password can not be empty and passwords dont not match with above codes.
I want to disable to enter space key while user write password.
User must never use space in keyboard inside of 2 textboxes.
1.textbox YeniSifreTextBox_I
2.textbox YeniSifreTekrarTextBox_I
You can use the below javaScript code to block the space key,
function RestrictSpace() {
if (event.keyCode == 32) {
return false;
}
}
HTML
<textarea onkeypress="return RestrictSpace()"></textarea>
Hope this helps you.
<input type="number"
id="cardNumber"
name="cardNumber"
required
onKeyDown="if(event.keyCode === 32)
return false;">
You can implement the same functionality, without creating a custom function.