This question already has answers here:
How can I validate an email address in JavaScript?
(79 answers)
Closed 5 years ago.
I have One Register-form for creating Account.In Email Field How Can i Check Enter Email is Real Email Id or Fake Email Id without Sent Any Email.And Also when User Leave The Field Validation will be start.Any idea please Share me....
You can't do this work with js(without sedn email):
i recommend to send a code to your user rmail and verify that.
this way is good to valid email and register user.
note : if you want to know is the email is in email pattern you can do with html and js :
html way :
<input type="email" name="email" placeholder="Your email">
js way :
How to validate email address in JavaScript?
Related
This question already has an answer here:
Learning Regular Expressions [closed]
(1 answer)
Closed 4 years ago.
I have an input field on a registration screen where the user has to enter his user id which is generally 6 characters long. First 2 characters are always alphabets, and the following characters are mostly numbers. (eg. ab123c or xy5678)
How can I check in the input field with jquery / javascript that user only enters in above format before hitting submit.
<input type="text" maxlength="6" name="uid" id="uid" placeholder="enter user id here">
You can validate your input using regex
regex = /^[a-z]{2}[a-z0-9]{4}$/i ;
regex = /^[a-z]{2}[a-z0-9]{4}$/i ;
console.log('ab1234', regex.test('ab1234'));
console.log('abc234', regex.test('abc234'));
console.log('ab1d34', regex.test('ab1d34'));
console.log('ab12e4', regex.test('ab12e4'));
console.log('ab12yz', regex.test('ab12yz'));
console.log('2b1234', regex.test('2b1234'));
console.log('a11234', regex.test('a11234'));
You don't need javascript or jquery. Can use HTML. w3c School
<input type="text" maxlength="6" name="uid" id="uid" placeholder="enter user id here" pattern="[a-zA-z]{2}[a-zA-Z0-9]{4}">
Thanks for the update Barmar, not used it before.
Update:
First I don't know why this is closed. The question isn't about learning regular expression, it's about implementation. Aurelien provides the right answer if you want to use jQuery, mine is if you don't want to use jQuery or javascript. Zohaib ljaz doesn't address the core issue of implementation.
Second: Most of the comments aren't helpful, he does provided examples and it has max-length in the code so of course 6 is the max.
Try this
$('form').on('submit', function(e){
e.preventDefault();
if($('#uid').val().match(/^[a-zA-Z]{2}[a-zA-Z0-9]{4}$/)){
$(this).submit()
}
else {
//Do your error logic here
}
}
This question already has answers here:
HTML5 Email input pattern attribute
(20 answers)
Closed 7 years ago.
I am stuck with this issue to which I did not pay attention to before.
<label> Email Address </label>
<input type="email" id="emailAddress" required placeholder='Email Address' />
<button type="submit" class="button primary small">Submit</button>
In my JS file I am checking for its validation using checkValidity()
checkValidEmail: function(event){
var emailAddress = $('#emailAddress');
if(emailAddress[0].checkValidity()){
console.log('Valid');
} else{
console.log('Not Valid');
}
}
"keyup #emailAddress": "checkValidEmail" // KeyUp works as expected
Output:
'a#b' // Valid
I do not understand this behavior. As per my knowledge #.com was the regex for input email.
Please note: I tried this on multiple sites with forms and it shows the same input. In the above case I am executing this on the chrome browser.
Thanks for taking time to reply!
If you want to use regular expression validation, read on
http://www.regular-expressions.info/email.html
Be aware that below is 100% valid and working email address :-) Use it often for testing incorrectly implemented email validation
xn--80a1acny#xn--80auew.xn--j1amh
Another option is to check if email address domain name is valid. Do do that you can query DNS server for MX record (this one points to SMTP server responsible for receiving incoming mail). You will need server side code to do that.
in HTML5 you can validate email like this
<form>
<input type="email" placeholder="Enter your email">
<input type="submit" value="Submit">
</form>
This question already has answers here:
Best way to defend against mysql injection and cross site scripting
(4 answers)
Closed 7 years ago.
I have a website that has an input form that submits to a php page and adds a players username to a database and counts the views of that player's name to a top 10 list.
My friend tried out inputting other stuff such as html code and javascript.
it get's displayed on my top 10 list.
do you have any suggestions how I can make my form more secure?
I have been searching for ages and haven't found anything yet.
all help would be highly appreciated :)
<form method="get" action="player.php">
<div class="form-group">
<div class="input-group input-group-lg">
<input name="user" type="text" class="form-control" placeholder="Steve" aria-describedby="sizing-addon2">
<span class="input-group-btn">
<input type="submit" class="btn btn-success" value="View Skin">
</span>
</div>
</form>
Freeze your requirement around username e.g. alphanumeric including special chars and Max length etc. Write validation logic using javascript regular expression. Reject everything else that fails.
Client side (HTML/Javascript) validation is only to be nice and responsive to the user, it can always be circumvented by a malicious user. Any validation needed should be done server side even if it repeats validation done on the client side.
Do not allow user to input special characters is the best way to block it. Well to be more secure and confident always have a limited set of valid characters for each text box and validate them on client-side as well as on the server side.
One example would be
function validateUsername(){
var username = document.getElementById('txt_username').value;
if( /[^a-zA-Z0-9]/.test( username ) ) {
alert('Input is not alphanumeric');
return false;
}
return true;
}
On server side you can also use regular expression. like following
if(preg_match('/[^a-z_\-0-9]/i', $username))
{
echo "not valid string";
}
This question already has answers here:
Manually Triggering Form Validation using jQuery
(11 answers)
Closed 7 years ago.
If an HTML form contains an input text field and it is declared like this:
<input type="email" id="loginEmail" placeholder="Email address" required>
Then the if this field is empty and user clicks on submit button then an error appears that "Please fill out this field"(Stackoverflow wont let me upload images because my reputation is too low :( )
But if the click on submit button of this form is handled via Javascript or JQuery and if false is returned from the function, no notification appears and no checking happens.
How to resolve it? I want to handle the onClick event of submit button but still want this feature of checking empty fields. Any help?
<input type="email" id="loginEmail" placeholder="Email address" required >
<script>
setTimeout(function(){
alert('haii');
if(document.getElementById('loginEmail').value==''){
alert('the field should not remain empty');
}
}, 3000);
</script>
I think the above code may help you.
I have a html page that asks the user for a username and a password through an authentication challenge window. What I need to do is to enter a default value for the username and password by myself using Javascript or whatever so that the user can access the page without typing the username and the password.
In other words, In order to access the page you have to enter a username and a password through authentication challenge window. What I do now is to alert a message that tells the user enter "guest" for the username and "guest" for the password so that he can access the page. But I don't want this to happen. I want to handle the authentication challenge by my self by setting the username and password so that the user won't have to enter them.
Thanks for your help.
You can add a value attribute to a text box using:
<input id="mytextbox" type="text" value="FOOBAR" />
<input id="myPassWord" type="password" value="SOMEVAL" />
KevinBoucher does have a point about security, though I'm assuming you've thought it through.
Other solutions would be to use JavaScript to reference the above by ID
document.getElementById("mytextbox").value = "FOOBAR";
Without examples it's hard to come up with a solid solution though :)